{"id":114850,"date":"2026-10-10T11:48:57","date_gmt":"2026-10-10T03:48:57","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/114850.html"},"modified":"2026-10-10T11:48:57","modified_gmt":"2026-10-10T03:48:57","slug":"android-ndk-%e5%ae%9e%e6%88%98%ef%bc%9a%e4%bb%8e%e9%9b%b6%e6%89%93%e9%80%a0%e3%80%8c%e7%ac%94%e5%a2%a8%e4%b9%a6%e9%a6%99%e3%80%8d%e5%a4%9a%e6%a0%bc%e5%bc%8f%e7%94%b5%e5%ad%90%e4%b9%a6%e9%98%85","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/114850.html","title":{"rendered":"Android NDK \u5b9e\u6218\uff1a\u4ece\u96f6\u6253\u9020\u300c\u7b14\u58a8\u4e66\u9999\u300d\u591a\u683c\u5f0f\u7535\u5b50\u4e66\u9605\u8bfb\u5668"},"content":{"rendered":"<p>** \u6458\u8981**: \u672c\u6587\u57fa\u4e8e\u300c\u7b14\u58a8\u4e66\u9999\u300d\u7535\u5b50\u4e66\u5e94\u7528\u7684\u91cd\u6784\u5b9e\u6218\uff0c\u4ece\u96f6\u8bb2\u89e3\u5982\u4f55\u5728 Android \u7aef\u901a\u8fc7 NDK \u6253\u901a Java \u4e0e C++ \u5c42\uff0c\u5b9e\u73b0 EPUB\u3001PDF\u3001Office 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\u63a5\u53e3Java_\u5305\u540d_\u7c7b\u540d_\u65b9\u6cd5\u540d<\/p>\n<p><\/span> <\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>\u6587\u4ef6\u6d41\u5904\u7406\u5206\u5757\u8bfb\u5199<\/p>\n<p><\/span> <\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>AES \u52a0\u89e3\u5bc6OpenSSL \/ mbedtls<\/p>\n<p><\/span> <\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>WebViewEPUB \/ HTML<\/p>\n<p><\/span> <\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>PdfRendererPDF \u4f4d\u56fe\u6e32\u67d3<\/p>\n<p><\/span> <\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>TBS \u5185\u6838Office \u2192 HTML5<\/p>\n<p><\/span> <\/p>\n<p>\u5404\u6a21\u5757\u804c\u8d23\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>Java\/Kotlin \u5c42\uff1a\u8d1f\u8d23 UI \u5c55\u793a\u4e0e\u4e1a\u52a1\u7f16\u6392\u3002\u4e66\u67b6\u7ba1\u7406\u5b8c\u6210\u4e66\u7c4d\u5bfc\u5165\u3001\u5c01\u9762\u63d0\u53d6\u4e0e\u641c\u7d22\uff1b\u9605\u8bfb\u8def\u7531\u6839\u636e\u6587\u4ef6\u540e\u7f00\u628a EPUB\u3001PDF\u3001Office \u6587\u6863\u5206\u53d1\u5230\u5bf9\u5e94\u7684\u9605\u8bfb\u5668\uff1bNativeCrypto \u5219\u4f5c\u4e3a JNI \u7684\u5165\u53e3\uff0c\u628a\u52a0\u89e3\u5bc6\u8bf7\u6c42\u4e0b\u53d1\u7ed9\u539f\u751f\u5c42\u3002<\/li>\n<li>JNI \u5c42\uff1a\u4f5c\u4e3a Java \u4e0e C++ \u4e4b\u95f4\u7684\u6865\u6881\uff0c\u6309 Java_\u5305\u540d_\u7c7b\u540d_\u65b9\u6cd5\u540d \u89c4\u8303\u58f0\u660e native \u65b9\u6cd5\uff0c\u8d1f\u8d23\u5b57\u7b26\u4e32\u3001\u6587\u4ef6\u8def\u5f84\u7b49\u6570\u636e\u7c7b\u578b\u7684\u8f6c\u6362\u4e0e\u5185\u5b58\u7ba1\u7406\u3002<\/li>\n<li>C++ \u5c42\uff1a\u627f\u8f7d\u771f\u6b63\u8017\u65f6\u7684\u6587\u4ef6\u6d41\u5904\u7406\u4e0e AES \u52a0\u89e3\u5bc6\u903b\u8f91\uff0c\u5229\u7528 OpenSSL \u6216 mbedtls \u5b9e\u73b0\u5206\u5757\u52a0\u5bc6\uff0c\u65e2\u63d0\u5347\u6027\u80fd\uff0c\u4e5f\u964d\u4f4e\u88ab\u9006\u5411\u5206\u6790\u7684\u98ce\u9669\u3002<\/li>\n<li>\u6e32\u67d3\u5185\u6838\uff1aEPUB \u4ea4\u7ed9 WebView \u5206\u7ae0\u52a0\u8f7d\uff0cPDF \u7528\u7cfb\u7edf PdfRenderer \u914d\u5408\u7ebf\u7a0b\u6c60\u6e32\u67d3\uff0cOffice \u6587\u6863\u5219\u4ea4\u7ed9 TBS \u5185\u6838\u8f6c\u6362\u4e3a HTML5 \u9884\u89c8\uff0c\u5404\u53d6\u6240\u957f\u3002<\/li>\n<\/ul>\n<h3>\u76ee\u5f55<\/h3>\n<ul>\n<li>\u2460 \u5f00\u53d1\u73af\u5883\u642d\u5efa\u4e0e NDK \u914d\u7f6e\u6307\u5357<\/li>\n<li>\u2461 \u672c\u5730\u7f51\u9875\u52a0\u8f7d\u4e0e\u6d4f\u89c8\u5668\u6838\u5fc3\u5b9e\u73b0<\/li>\n<li>\u2462 EPUB \u7535\u5b50\u4e66\u89e3\u6790\u4e0e\u9605\u8bfb\u89c6\u56fe\u6784\u5efa<\/li>\n<li>\u2463 PDF \u6587\u4ef6\u6e32\u67d3\u4e0e\u5e73\u6ed1\u7ffb\u4e66\u52a8\u753b\u5236\u4f5c<\/li>\n<li>\u2464 Office \u6587\u6863\u9884\u89c8\u4e0e TBS \u5185\u6838\u96c6\u6210<\/li>\n<li>\u2465 JNI \u63a5\u53e3\u521b\u5efa\u4e0e CMake \u7f16\u8bd1\u5b9e\u6218<\/li>\n<li>\u2466 \u5229\u7528\u539f\u751f\u4ee3\u7801\u5b9e\u73b0\u6570\u636e\u52a0\u89e3\u5bc6\u529f\u80fd<\/li>\n<li>\u2467 \u7535\u5b50\u4e66\u67b6\u9879\u76ee\u9700\u6c42\u5206\u6790\u4e0e\u529f\u80fd\u89c4\u5212<\/li>\n<li>\u2468 \u7efc\u5408\u5b9e\u6218\uff1a\u4ece\u96f6\u5b8c\u6210\u7b14\u58a8\u4e66\u9999\u5e94\u7528<\/li>\n<li>\u2469 \u5e38\u89c1\u7f16\u8bd1\u62a5\u9519\u6392\u67e5\u4e0e\u6027\u80fd\u4f18\u5316\u6280\u5de7<\/li>\n<li>\u246a \u603b\u7ed3\u4e0e\u5c55\u671b\n<ul>\n<li>\u53c2\u8003\u8d44\u6599<\/li>\n<li>\u5b8c\u6574\u5b9e\u6218\u4ee3\u7801<\/li>\n<li>\u5e38\u89c1\u95ee\u9898 FAQ<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u2460 \u5f00\u53d1\u73af\u5883\u642d\u5efa\u4e0e NDK \u914d\u7f6e\u6307\u5357<\/h3>\n<p>\u5de5\u6b32\u5584\u5176\u4e8b\uff0c\u5fc5\u5148\u5229\u5176\u5668\u3002\u8981\u5728 Android \u9879\u76ee\u4e2d\u5f15\u5165\u539f\u751f\u4ee3\u7801\u5904\u7406\u80fd\u529b\uff0c\u7b2c\u4e00\u6b65\u5c31\u662f\u914d\u7f6e\u597d NDK\uff08Native Development Kit\uff09\u73af\u5883\u3002\u5f88\u591a\u65b0\u624b\u5728\u8fd9\u91cc\u5bb9\u6613\u8e29\u5751\uff0c\u6bd4\u5982\u7248\u672c\u4e0d\u5339\u914d\u5bfc\u81f4\u7f16\u8bd1\u5931\u8d25\uff0c\u6216\u8005\u8def\u5f84\u914d\u7f6e\u9519\u8bef\u8ba9 IDE \u627e\u4e0d\u5230\u5934\u6587\u4ef6\u3002\u4e0b\u9762\u6211\u4eec\u4e00\u6b65\u6b65\u628a\u73af\u5883\u642d\u8d77\u6765\u3002<\/p>\n<h4>1.1 \u5b89\u88c5 NDK\u3001CMake \u4e0e LLDB<\/h4>\n<p>\u9996\u5148\uff0c\u786e\u4fdd\u4f60\u7684 Android Studio \u5df2\u7ecf\u5b89\u88c5\u4e86\u6700\u65b0\u7684 CMake \u548c LLDB \u7ec4\u4ef6\u3002\u6253\u5f00 SDK Manager\uff08\u83dc\u5355\u680f Tools \u2192 SDK Manager\uff09\uff0c\u5207\u6362\u5230 SDK Tools \u6807\u7b7e\u9875\uff0c\u52fe\u9009\u4ee5\u4e0b\u4e09\u9879\uff1a<\/p>\n<ul>\n<li>NDK (Side by side)\uff1a\u5373 NDK \u672c\u4f53\uff0c\u5efa\u8bae\u52fe\u9009\u6700\u65b0\u7a33\u5b9a\u7248\uff08\u5982 25.1.8937393 \u6216\u66f4\u9ad8\uff09\u3002<\/li>\n<li>CMake\uff1a\u7528\u4e8e\u9a71\u52a8 C++ \u6e90\u7801\u7684\u7f16\u8bd1\u4e0e\u94fe\u63a5\uff0c\u5efa\u8bae\u9009\u62e9 3.22.1 \u53ca\u4ee5\u4e0a\u7248\u672c\u3002<\/li>\n<li>LLDB\uff1a\u539f\u751f\u4ee3\u7801\u8c03\u8bd5\u5668\uff0c\u6392\u67e5 JNI \u5d29\u6e83\u65f6\u5fc5\u4e0d\u53ef\u5c11\u3002<\/li>\n<\/ul>\n<p>\u52fe\u9009\u540e\u70b9\u51fb Apply \u5f00\u59cb\u4e0b\u8f7d\u3002\u5b89\u88c5\u5b8c\u6210\u540e\uff0c\u53ef\u4ee5\u5728 SDK \u76ee\u5f55\/ndk\/ \u4e0b\u770b\u5230\u5bf9\u5e94\u7248\u672c\u7684\u6587\u4ef6\u5939\uff0c\u4f8b\u5982 25.1.8937393\u3002<\/p>\n<h4>1.2 \u5728 local.properties \u4e2d\u56fa\u5b9a NDK \u8def\u5f84<\/h4>\n<p>\u5b89\u88c5\u5b8c\u6210\u540e\uff0c\u9700\u8981\u5728\u9879\u76ee\u6839\u76ee\u5f55\u7684 local.properties \u6587\u4ef6\u4e2d\u660e\u786e\u6307\u5b9a NDK \u8def\u5f84\u3002\u8fd9\u4e00\u6b65\u770b\u4f3c\u7b80\u5355\uff0c\u4f46\u80fd\u6709\u6548\u907f\u514d\u591a\u7248\u672c\u5171\u5b58\u65f6\u7684\u6df7\u4e71\uff1a<\/p>\n<p># local.properties<br \/>\nndk.dir=\/Users\/yourname\/Library\/Android\/sdk\/ndk\/25.1.8937393<br \/>\nsdk.dir=\/Users\/yourname\/Library\/Android\/sdk<\/p>\n<p>\u5c0f\u8d34\u58eb\uff1a\u5982\u679c\u4f60\u540c\u65f6\u5b89\u88c5\u4e86\u591a\u4e2a NDK \u7248\u672c\uff0c\u52a1\u5fc5\u5728 local.properties \u91cc\u56fa\u5b9a\u4e00\u4e2a\uff0c\u5426\u5219 Gradle \u53ef\u80fd\u968f\u673a\u6311\u9009\u4e00\u4e2a\u7248\u672c\uff0c\u5bfc\u81f4\u7f16\u8bd1\u884c\u4e3a\u4e0d\u53ef\u9884\u671f\u3002<\/p>\n<h4>1.3 \u914d\u7f6e build.gradle \u7684 externalNativeBuild<\/h4>\n<p>\u63a5\u7740\u662f build.gradle \u7684\u914d\u7f6e\u3002\u5728 defaultConfig \u5757\u4e2d\uff0c\u5fc5\u987b\u58f0\u660e externalNativeBuild \u5e76\u8bbe\u7f6e\u652f\u6301\u7684 ABI \u67b6\u6784\u3002\u4e3a\u4e86\u517c\u5bb9\u4e3b\u6d41\u8bbe\u5907\uff0c\u901a\u5e38\u4fdd\u7559 armeabi-v7a \u548c arm64-v8a \u5373\u53ef\uff0c\u53bb\u6389\u8fc7\u65f6\u7684 x86 \u53ef\u4ee5\u663e\u8457\u51cf\u5c0f\u5305\u4f53\u79ef\uff1a<\/p>\n<p>android <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    defaultConfig <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        externalNativeBuild <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            cmake <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                cppFlags <span class=\"token interpolation-string\"><span class=\"token string\">\\&#8221;-std=c++11\\&#8221;<\/span><\/span><br \/>\n                arguments <span class=\"token interpolation-string\"><span class=\"token string\">\\&#8221;-DANDROID_STL=c++_shared\\&#8221;<\/span><\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        ndk <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token comment\">\/\/ \u53ea\u4fdd\u7559\u4e3b\u6d41 ABI\uff0c\u51cf\u5c0f\u5305\u4f53\u79ef<\/span><br \/>\n            abiFilters <span class=\"token interpolation-string\"><span class=\"token string\">\\&#8221;armeabi-v7a\\&#8221;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token interpolation-string\"><span class=\"token string\">\\&#8221;arm64-v8a\\&#8221;<\/span><\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    externalNativeBuild <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        cmake <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6307\u5411 CMakeLists.txt \u6240\u5728\u8def\u5f84<\/span><br \/>\n            path <span class=\"token interpolation-string\"><span class=\"token string\">\\&#8221;src\/main\/cpp\/CMakeLists.txt\\&#8221;<\/span><\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    sourceSets <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        main <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5b58\u653e\u9884\u7f16\u8bd1 .so \u7684\u76ee\u5f55<\/span><br \/>\n            jniLibs<span class=\"token punctuation\">.<\/span>srcDirs <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">\\&#8217;src\/main\/jniLibs\\&#8217;<\/span><span class=\"token punctuation\">]<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>1.4 \u7f16\u5199\u6700\u5c0f\u53ef\u7528\u7684 CMakeLists.txt<\/h4>\n<p>\u5728 src\/main\/cpp\/ \u76ee\u5f55\u4e0b\u521b\u5efa CMakeLists.txt\uff0c\u5148\u5199\u4e00\u4e2a\u6700\u5c0f\u53ef\u7528\u7684\u7248\u672c\uff0c\u9a8c\u8bc1\u73af\u5883\u662f\u5426\u6253\u901a\uff1a<\/p>\n<p>cmake_minimum_required(VERSION 3.22.1)<br \/>\nproject(book_reader)<\/p>\n<p>add_library(native_core SHARED native_core.cpp)<\/p>\n<p>find_library(log-lib log)<br \/>\ntarget_link_libraries(native_core ${log-lib})<\/p>\n<p>\u540c\u65f6\u521b\u5efa\u4e00\u4e2a native_core.cpp \u5360\u4f4d\u6587\u4ef6\uff0c\u91cc\u9762\u653e\u4e00\u4e2a\u7b80\u5355\u7684 JNI \u51fd\u6570\uff0c\u7528\u4e8e\u9a8c\u8bc1\u7f16\u8bd1\u94fe\u8def\u662f\u5426\u6b63\u5e38\uff1a<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;jni.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;android\/log.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">LOG_TAG<\/span> <span class=\"token string\">\\&#8221;NativeCore\\&#8221;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">LOGD<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">__android_log_print<\/span><span class=\"token punctuation\">(<\/span>ANDROID_LOG_DEBUG<span class=\"token punctuation\">,<\/span> LOG_TAG<span class=\"token punctuation\">,<\/span> __VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">extern<\/span> <span class=\"token string\">\\&#8221;C\\&#8221;<\/span> JNIEXPORT jstring JNICALL<br \/>\n<span class=\"token function\">Java_com_example_bookreader_NativeCore_hello<\/span><span class=\"token punctuation\">(<\/span>JNIEnv <span class=\"token operator\">*<\/span>env<span class=\"token punctuation\">,<\/span> jobject thiz<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token function\">LOGD<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;hello from native\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> env<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">NewStringUTF<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;Hello from C++!\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>1.5 \u9a8c\u8bc1\u73af\u5883\uff1a\u8dd1\u901a\u7b2c\u4e00\u4e2a native \u65b9\u6cd5<\/h4>\n<p>\u5728 Java\/Kotlin \u5c42\u58f0\u660e\u5bf9\u5e94\u7684 native \u65b9\u6cd5\u5e76\u52a0\u8f7d\u5e93\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">NativeCore<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">loadLibrary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;native_core\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">native<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">hello<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7136\u540e\u70b9\u51fb Build \u2192 Make Project\u3002\u5982\u679c\u7f16\u8bd1\u901a\u8fc7\uff0c\u8bf4\u660e NDK\u3001CMake\u3001ABI \u914d\u7f6e\u5168\u90e8\u5c31\u7eea\uff1b\u5982\u679c\u62a5\u9519\uff0c\u591a\u534a\u662f\u7248\u672c\u4e0d\u5339\u914d\u6216\u8def\u5f84\u672a\u914d\u7f6e\uff0c\u56de\u5230\u524d\u9762\u51e0\u6b65\u9010\u4e00\u6392\u67e5\u3002<\/p>\n<p>\u5e38\u89c1\u5751\u4f4d\uff1a<\/p>\n<ul>\n<li>CMake was unable to find a build program\uff1aCMake \u672a\u5b89\u88c5\u6216\u8def\u5f84\u672a\u914d\u7f6e\uff0c\u56de\u5230 SDK Manager \u68c0\u67e5\u3002<\/li>\n<li>undefined reference\uff1aCMakeLists.txt \u6f0f\u52a0\u4e86\u6e90\u6587\u4ef6\u6216\u94fe\u63a5\u5e93\u3002<\/li>\n<li>UnsatisfiedLinkError\uff1a.so \u5e93\u672a\u6253\u5305\u8fdb APK\uff0c\u68c0\u67e5 jniLibs.srcDirs \u548c abiFilters \u662f\u5426\u5339\u914d\u3002<\/li>\n<\/ul>\n<h3>\u2461 \u672c\u5730\u7f51\u9875\u52a0\u8f7d\u4e0e\u6d4f\u89c8\u5668\u6838\u5fc3\u5b9e\u73b0<\/h3>\n<p>\u867d\u7136\u6211\u4eec\u7684\u76ee\u6807\u662f\u505a\u7535\u5b50\u4e66\uff0c\u4f46\u5f88\u591a EPUB \u672c\u8d28\u4e0a\u662f\u6253\u5305\u597d\u7684 HTML\/CSS\/JS \u96c6\u5408\u3002\u56e0\u6b64\uff0c\u6784\u5efa\u4e00\u4e2a\u80fd\u591f\u9ad8\u6548\u52a0\u8f7d\u672c\u5730\u8d44\u6e90\u7684\u6d4f\u89c8\u5668\u6838\u5fc3\u662f\u57fa\u7840\u4e2d\u7684\u57fa\u7840\u3002\u76f4\u63a5\u4f7f\u7528\u7cfb\u7edf WebView \u52a0\u8f7d file:\/\/ \u534f\u8bae\u5f80\u5f80\u5b58\u5728\u6743\u9650\u95ee\u9898\u548c\u7f13\u5b58\u7b56\u7565\u4e0d\u53ef\u63a7\u7684\u7f3a\u9677\u3002\u4e0b\u9762\u6211\u4eec\u4e00\u6b65\u6b65\u5b9e\u73b0\u4e00\u4e2a\u53ef\u590d\u7528\u7684\u672c\u5730\u6d4f\u89c8\u5668\u6838\u5fc3\u3002<\/p>\n<h4>2.1 \u4e3a\u4ec0\u4e48\u4e0d\u7528 file:\/\/ \u534f\u8bae<\/h4>\n<p>\u76f4\u63a5\u7528 webView.loadUrl(\\&#8221;file:\/\/\/android_asset\/book\/chapter1.html\\&#8221;) \u770b\u4f3c\u7b80\u5355\uff0c\u4f46\u4f1a\u8e29\u5230\u51e0\u4e2a\u5751\uff1a<\/p>\n<ul>\n<li>\u8de8\u57df\u9650\u5236\uff1aHTML \u91cc\u901a\u8fc7\u76f8\u5bf9\u8def\u5f84\u5f15\u7528\u7684 CSS\/JS \u5728\u90e8\u5206\u7cfb\u7edf\u7248\u672c\u4e0a\u4f1a\u88ab\u62e6\u622a\uff0c\u5bfc\u81f4\u6837\u5f0f\u4e22\u5931\u6216\u811a\u672c\u4e0d\u6267\u884c\u3002<\/li>\n<li>\u7f13\u5b58\u4e0d\u53ef\u63a7\uff1afile:\/\/ \u7684\u7f13\u5b58\u7b56\u7565\u7531\u7cfb\u7edf\u51b3\u5b9a\uff0c\u96be\u4ee5\u4e3b\u52a8\u5237\u65b0\u6216\u6e05\u7406\uff0c\u66f4\u65b0\u4e66\u7c4d\u5185\u5bb9\u540e\u53ef\u80fd\u4ecd\u663e\u793a\u65e7\u9875\u9762\u3002<\/li>\n<li>\u6743\u9650\u95ee\u9898\uff1a\u67d0\u4e9b WebView \u5185\u6838\uff08\u5c24\u5176\u662f TBS\uff09\u5bf9 file:\/\/ \u7684\u8bbf\u95ee\u6709\u989d\u5916\u9650\u5236\uff0c\u5bb9\u6613\u51fa\u73b0\u767d\u5c4f\u3002<\/li>\n<\/ul>\n<p>\u66f4\u4f18\u7684\u65b9\u6848\u662f\u62e6\u622a\u8bf7\u6c42\uff0c\u5c06\u672c\u5730\u8d44\u6e90\u6620\u5c04\u5230\u865a\u62df\u7684\u57df\u540d\u4e0b\u3002\u8fd9\u6837\u65e2\u80fd\u7ed5\u5f00\u8de8\u57df\u9650\u5236\uff0c\u53c8\u80fd\u5b8c\u5168\u638c\u63a7\u8d44\u6e90\u7684\u8bfb\u53d6\u4e0e\u6ce8\u5165\u903b\u8f91\u3002<\/p>\n<h4>2.2 \u81ea\u5b9a\u4e49 WebViewClient \u62e6\u622a\u672c\u5730\u8d44\u6e90<\/h4>\n<p>\u6211\u4eec\u81ea\u5b9a\u4e49\u4e00\u4e2a LocalWebViewClient\uff0c\u91cd\u5199 shouldInterceptRequest \u65b9\u6cd5\u3002\u5f53\u68c0\u6d4b\u5230\u7279\u5b9a\u524d\u7f00\u7684\u8bf7\u6c42\u65f6\uff0c\u76f4\u63a5\u4ece assets \u6216\u5185\u90e8\u5b58\u50a8\u8bfb\u53d6\u6587\u4ef6\u6d41\uff0c\u6784\u9020\u4e00\u4e2a WebResourceResponse \u8fd4\u56de\u7ed9 WebView\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LocalWebViewClient<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">WebViewClient<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token comment\">\/\/ \u865a\u62df\u57df\u540d\u524d\u7f00\uff0c\u6240\u6709\u672c\u5730\u8d44\u6e90\u90fd\u6620\u5c04\u5230\u8be5\u57df\u540d\u4e0b<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token constant\">LOCAL_HOST<\/span> <span class=\"token operator\">=<\/span> <span class=\"token string\">\\&#8221;https:\/\/local.book\/\\&#8221;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Context<\/span> context<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">LocalWebViewClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Context<\/span> context<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>context <span class=\"token operator\">=<\/span> context<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">WebResourceResponse<\/span> <span class=\"token function\">shouldInterceptRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">WebView<\/span> view<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">WebResourceRequest<\/span> request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token class-name\">String<\/span> url <span class=\"token operator\">=<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUrl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u53ea\u62e6\u622a\u672c\u5730\u865a\u62df\u57df\u540d\u7684\u8bf7\u6c42<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">.<\/span><span class=\"token function\">startsWith<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">LOCAL_HOST<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token class-name\">String<\/span> assetPath <span class=\"token operator\">=<\/span> url<span class=\"token punctuation\">.<\/span><span class=\"token function\">replace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">LOCAL_HOST<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\\&#8221;\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                <span class=\"token class-name\">InputStream<\/span> input <span class=\"token operator\">=<\/span> context<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAssets<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">open<\/span><span class=\"token punctuation\">(<\/span>assetPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">String<\/span> mime <span class=\"token operator\">=<\/span> <span class=\"token class-name\">URLConnection<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">guessContentTypeFromName<\/span><span class=\"token punctuation\">(<\/span>assetPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">WebResourceResponse<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                        mime <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">?<\/span> mime <span class=\"token operator\">:<\/span> <span class=\"token string\">\\&#8221;text\/html\\&#8221;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                        <span class=\"token string\">\\&#8221;UTF-8\\&#8221;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                        input<br \/>\n                <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">shouldInterceptRequest<\/span><span class=\"token punctuation\">(<\/span>view<span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8981\u70b9\uff1ashouldInterceptRequest \u5728\u5b50\u7ebf\u7a0b\u4e2d\u6267\u884c\uff0c\u53ef\u4ee5\u653e\u5fc3\u505a\u6587\u4ef6 IO\uff0c\u4e0d\u4f1a\u963b\u585e UI\u3002\u8fd4\u56de\u7684 WebResourceResponse \u9700\u8981\u6307\u5b9a\u6b63\u786e\u7684 MIME \u7c7b\u578b\uff0c\u5426\u5219\u56fe\u7247\u3001CSS \u53ef\u80fd\u65e0\u6cd5\u6b63\u786e\u89e3\u6790\u3002<\/p>\n<h4>2.3 \u52a8\u6001\u6ce8\u5165 CSS \u4e0e JS<\/h4>\n<p>\u62e6\u622a\u8bf7\u6c42\u7684\u53e6\u4e00\u4e2a\u597d\u5904\u662f\u80fd\u5bf9\u8fd4\u56de\u5185\u5bb9\u505a\u52a8\u6001\u6ce8\u5165\u3002\u6bd4\u5982\u7edf\u4e00\u6dfb\u52a0\u591c\u95f4\u6a21\u5f0f\u7684\u6837\u5f0f\u8868\uff0c\u6216\u6ce8\u5165\u81ea\u5b9a\u4e49\u5b57\u4f53\uff1a<\/p>\n<p><span class=\"token annotation punctuation\">@Override<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">WebResourceResponse<\/span> <span class=\"token function\">shouldInterceptRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">WebView<\/span> view<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">WebResourceRequest<\/span> request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token class-name\">String<\/span> url <span class=\"token operator\">=<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUrl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">.<\/span><span class=\"token function\">startsWith<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">LOCAL_HOST<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token class-name\">String<\/span> assetPath <span class=\"token operator\">=<\/span> url<span class=\"token punctuation\">.<\/span><span class=\"token function\">replace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">LOCAL_HOST<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\\&#8221;\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8bfb\u53d6\u539f\u59cb HTML<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> html <span class=\"token operator\">=<\/span> <span class=\"token function\">readAssetAsString<\/span><span class=\"token punctuation\">(<\/span>assetPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5728 &lt;\/head&gt; \u524d\u6ce8\u5165\u591c\u95f4\u6a21\u5f0f\u6837\u5f0f<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> nightCss <span class=\"token operator\">=<\/span> <span class=\"token string\">\\&#8221;&lt;link rel=\\\\\\&#8221;stylesheet\\\\\\&#8221; href=\\\\\\&#8221;https:\/\/local.book\/css\/night.css\\\\\\&#8221;&gt;\\&#8221;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            html <span class=\"token operator\">=<\/span> html<span class=\"token punctuation\">.<\/span><span class=\"token function\">replace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;&lt;\/head&gt;\\&#8221;<\/span><span class=\"token punctuation\">,<\/span> nightCss <span class=\"token operator\">+<\/span> <span class=\"token string\">\\&#8221;&lt;\/head&gt;\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">WebResourceResponse<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                    <span class=\"token string\">\\&#8221;text\/html\\&#8221;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\\&#8221;UTF-8\\&#8221;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ByteArrayInputStream<\/span><span class=\"token punctuation\">(<\/span>html<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;UTF-8\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">shouldInterceptRequest<\/span><span class=\"token punctuation\">(<\/span>view<span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">readAssetAsString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> path<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token class-name\">InputStream<\/span> input <span class=\"token operator\">=<\/span> context<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAssets<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">open<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">ByteArrayOutputStream<\/span> output <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ByteArrayOutputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> buffer <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">8192<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">=<\/span> input<span class=\"token punctuation\">.<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!=<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        output<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    input<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> output<span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;UTF-8\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u6837\uff0c\u591c\u95f4\u6a21\u5f0f\u3001\u5b57\u4f53\u7f29\u653e\u7b49\u80fd\u529b\u90fd\u53ef\u4ee5\u901a\u8fc7\u6ce8\u5165\u6837\u5f0f\u8868\u5b9e\u73b0\uff0c\u65e0\u9700\u6539\u52a8 EPUB \u539f\u59cb\u5185\u5bb9\u3002<\/p>\n<h4>2.4 \u5f00\u542f\u786c\u4ef6\u52a0\u901f<\/h4>\n<p>\u786c\u4ef6\u52a0\u901f\u5bf9 WebView \u7684\u6e32\u67d3\u6d41\u7545\u5ea6\u81f3\u5173\u91cd\u8981\u3002\u5728 AndroidManifest.xml \u7684 &lt;application&gt; \u6807\u7b7e\u4e0a\u5168\u5c40\u5f00\u542f\uff1a<\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>application<\/span><br \/>\n    <span class=\"token attr-name\"><span class=\"token namespace\">android:<\/span>hardwareAccelerated<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\\&#8221;<\/span>true<span class=\"token punctuation\">\\&#8221;<\/span><\/span><br \/>\n    <span class=\"token attr-name\">&#8230;<\/span> <span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>\u540c\u65f6\u5728 WebView \u521d\u59cb\u5316\u65f6\u663e\u5f0f\u8bbe\u7f6e\uff1a<\/p>\n<p>webView<span class=\"token punctuation\">.<\/span><span class=\"token function\">setLayerType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">View<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">LAYER_TYPE_HARDWARE<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nwebView<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSettings<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setJavaScriptEnabled<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6ce8\u610f\uff1a\u5982\u679c\u9875\u9762\u5305\u542b\u5927\u91cf\u900f\u660e\u52a8\u753b\uff0cLAYER_TYPE_HARDWARE \u53ef\u80fd\u5f15\u53d1\u6e32\u67d3\u5f02\u5e38\u3002\u9047\u5230\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u6539\u4e3a LAYER_TYPE_SOFTWARE \u6216 LAYER_TYPE_NONE \u505a\u5bf9\u6bd4\u6d4b\u8bd5\u3002<\/p>\n<h4>2.5 \u9884\u52a0\u8f7d\u76f8\u90bb\u7ae0\u8282\uff0c\u51cf\u5c11\u767d\u5c4f<\/h4>\n<p>\u5bf9\u4e8e\u957f\u6587\u6863\u7684\u6eda\u52a8\uff0c\u53ef\u4ee5\u901a\u8fc7\u9884\u52a0\u8f7d\u76f8\u90bb\u7ae0\u8282\u7684 DOM \u8282\u70b9\u6765\u51cf\u5c11\u767d\u5c4f\u65f6\u95f4\u3002\u601d\u8def\u662f\u7ef4\u62a4\u4e24\u4e2a\u9690\u85cf\u7684 WebView\uff0c\u4e00\u4e2a\u663e\u793a\u5f53\u524d\u7ae0\uff0c\u53e6\u4e00\u4e2a\u9884\u52a0\u8f7d\u4e0b\u4e00\u7ae0\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ChapterPreloader<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">WebView<\/span> currentView<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">WebView<\/span> nextView<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">preloadNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> nextChapterUrl<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5728\u9690\u85cf\u7684 nextView \u4e2d\u63d0\u524d\u52a0\u8f7d\u4e0b\u4e00\u7ae0<\/span><br \/>\n        nextView<span class=\"token punctuation\">.<\/span><span class=\"token function\">loadUrl<\/span><span class=\"token punctuation\">(<\/span>nextChapterUrl<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">switchToNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token comment\">\/\/ \u52a8\u753b\u7ed3\u675f\u540e\u77ac\u95f4\u5207\u6362\uff0c\u89c6\u89c9\u4e0a\u5f62\u6210\u65e0\u7f1d\u7ffb\u9875<\/span><br \/>\n        currentView<span class=\"token punctuation\">.<\/span><span class=\"token function\">setVisibility<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">View<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">GONE<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        nextView<span class=\"token punctuation\">.<\/span><span class=\"token function\">setVisibility<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">View<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">VISIBLE<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u914d\u5408 GestureDetector \u76d1\u542c\u5de6\u53f3\u6ed1\u52a8\uff0c\u5f53\u7528\u6237\u6ed1\u52a8\u65f6\u9884\u5148\u52a0\u8f7d\u4e0b\u4e00\u7ae0\u5185\u5bb9\uff0c\u5f85\u52a8\u753b\u7ed3\u675f\u65f6\u77ac\u95f4\u5207\u6362\uff0c\u89c6\u89c9\u4e0a\u5c31\u5f62\u6210\u4e86\u65e0\u7f1d\u7ffb\u9875\u3002<\/p>\n<p>\u5e38\u89c1\u5751\u4f4d\uff1a<\/p>\n<ul>\n<li>\u767d\u5c4f\uff1a\u591a\u534a\u662f file:\/\/ \u8de8\u57df\u6216 MIME \u7c7b\u578b\u9519\u8bef\uff0c\u6539\u7528\u865a\u62df\u57df\u540d\u62e6\u622a\u65b9\u6848\u3002<\/li>\n<li>CSS\/JS \u4e0d\u751f\u6548\uff1a\u68c0\u67e5\u8d44\u6e90\u8def\u5f84\u662f\u5426\u4e0e\u62e6\u622a\u524d\u7f00\u4e00\u81f4\uff0c\u786e\u8ba4 MIME \u7c7b\u578b\u6b63\u786e\u3002<\/li>\n<li>\u5185\u5b58\u6ea2\u51fa\uff1a\u4e0d\u8981\u540c\u65f6\u521b\u5efa\u8fc7\u591a WebView\uff0c\u5efa\u8bae\u590d\u7528\u5b9e\u4f8b\u5e76\u4e3b\u52a8 destroy() \u4e0d\u518d\u4f7f\u7528\u7684\u9875\u9762\u3002<\/li>\n<li>\u786c\u4ef6\u52a0\u901f\u5f02\u5e38\uff1a\u4e2a\u522b\u673a\u578b\u5bf9 LAYER_TYPE_HARDWARE \u652f\u6301\u4e0d\u4f73\uff0c\u53ef\u964d\u7ea7\u4e3a LAYER_TYPE_SOFTWARE \u5bf9\u6bd4\u3002<\/li>\n<\/ul>\n<h3>\u2462 EPUB \u7535\u5b50\u4e66\u89e3\u6790\u4e0e\u9605\u8bfb\u89c6\u56fe\u6784\u5efa<\/h3>\n<p>EPUB \u683c\u5f0f\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a ZIP \u538b\u7f29\u5305\uff0c\u91cc\u9762\u5305\u542b\u4e86 OPF \u5143\u6570\u636e\u3001NCX \u5bfc\u822a\u6587\u4ef6\u548c\u5927\u91cf\u7684 XHTML \u5185\u5bb9\u9875\u3002\u89e3\u6790 EPUB \u7684\u5173\u952e\u5728\u4e8e\u6b63\u786e\u89e3\u538b\u5e76\u5efa\u7acb\u7ae0\u8282\u7d22\u5f15\u3002\u4e0b\u9762\u6211\u4eec\u4e00\u6b65\u6b65\u5b9e\u73b0\u4e00\u4e2a\u53ef\u590d\u7528\u7684 EPUB \u89e3\u6790\u5668\u4e0e\u9605\u8bfb\u89c6\u56fe\u3002<\/p>\n<h4>3.1 \u7406\u89e3 EPUB \u7684\u5185\u90e8\u7ed3\u6784<\/h4>\n<p>\u52a8\u624b\u89e3\u6790\u4e4b\u524d\uff0c\u5148\u641e\u6e05\u695a EPUB \u5305\u5185\u7684\u76ee\u5f55\u7ed3\u6784\u3002\u4e00\u4e2a\u6807\u51c6\u7684 EPUB 3 \u6587\u4ef6\u89e3\u538b\u540e\u5927\u81f4\u5982\u4e0b\uff1a<\/p>\n<p>book.epub<br \/>\n\u251c\u2500\u2500 META-INF\/<br \/>\n\u2502   \u2514\u2500\u2500 container.xml      # \u5165\u53e3\u6587\u4ef6\uff0c\u6307\u5411 OPF \u5143\u6570\u636e\u6587\u4ef6<br \/>\n\u251c\u2500\u2500 OEBPS\/<br \/>\n\u2502   \u251c\u2500\u2500 content.opf        # \u5143\u6570\u636e + \u6e05\u5355 + \u4e66\u810a\u987a\u5e8f<br \/>\n\u2502   \u251c\u2500\u2500 toc.ncx            # \u76ee\u5f55\u5bfc\u822a\uff08EPUB 2\uff09<br \/>\n\u2502   \u251c\u2500\u2500 nav.xhtml          # \u76ee\u5f55\u5bfc\u822a\uff08EPUB 3\uff09<br \/>\n\u2502   \u251c\u2500\u2500 chapter1.xhtml     # \u6b63\u6587\u5185\u5bb9\u9875<br \/>\n\u2502   \u251c\u2500\u2500 chapter2.xhtml<br \/>\n\u2502   \u251c\u2500\u2500 css\/<br \/>\n\u2502   \u2502   \u2514\u2500\u2500 style.css<br \/>\n\u2502   \u2514\u2500\u2500 images\/<br \/>\n\u2502       \u2514\u2500\u2500 cover.jpg<br \/>\n\u2514\u2500\u2500 mimetype               # \u56fa\u5b9a\u5185\u5bb9 \\&#8221;application\/epub+zip\\&#8221;<\/p>\n<p>\u89e3\u6790\u94fe\u8def\u662f\uff1acontainer.xml \u2192 content.opf \u2192 spine\uff08\u4e66\u810a\uff09\u2192 \u5404 XHTML \u5185\u5bb9\u9875\u3002container.xml \u544a\u8bc9\u6211\u4eec OPF \u6587\u4ef6\u5728\u54ea\uff0cOPF \u91cc\u7684 &lt;spine&gt; \u5b9a\u4e49\u4e86\u9605\u8bfb\u987a\u5e8f\uff0c&lt;manifest&gt; \u5219\u5217\u51fa\u4e86\u6240\u6709\u8d44\u6e90\u6587\u4ef6\u3002<\/p>\n<h4>3.2 \u7528 ZipInputStream \u89e3\u6790 container.xml \u5b9a\u4f4d OPF<\/h4>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Java \u539f\u751f\u7684 ZipInputStream \u904d\u5386\u5305\u5185\u6587\u4ef6\u3002\u9996\u5148\u8bfb\u53d6 META-INF\/container.xml \u627e\u5230 OPF \u6587\u4ef6\u7684\u8def\u5f84\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">EpubParser<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">findOpfPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> epubPath<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token class-name\">ZipInputStream<\/span> zis <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ZipInputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FileInputStream<\/span><span class=\"token punctuation\">(<\/span>epubPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">ZipEntry<\/span> entry<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> opfPath <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>entry <span class=\"token operator\">=<\/span> zis<span class=\"token punctuation\">.<\/span><span class=\"token function\">getNextEntry<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;META-INF\/container.xml\\&#8221;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                opfPath <span class=\"token operator\">=<\/span> <span class=\"token function\">parseOpfPath<\/span><span class=\"token punctuation\">(<\/span>zis<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        zis<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> opfPath<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">parseOpfPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InputStream<\/span> input<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token comment\">\/\/ \u7528 DOM \u89e3\u6790 container.xml\uff0c\u8bfb\u53d6 rootfile \u7684 full-path \u5c5e\u6027<\/span><br \/>\n        <span class=\"token class-name\">DocumentBuilderFactory<\/span> factory <span class=\"token operator\">=<\/span> <span class=\"token class-name\">DocumentBuilderFactory<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Document<\/span> doc <span class=\"token operator\">=<\/span> factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">newDocumentBuilder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parse<\/span><span class=\"token punctuation\">(<\/span>input<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">NodeList<\/span> rootfiles <span class=\"token operator\">=<\/span> doc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementsByTagName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;rootfile\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>rootfiles<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLength<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token class-name\">Element<\/span> rootfile <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Element<\/span><span class=\"token punctuation\">)<\/span> rootfiles<span class=\"token punctuation\">.<\/span><span class=\"token function\">item<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> rootfile<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;full-path\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8981\u70b9\uff1acontainer.xml \u7684\u547d\u540d\u7a7a\u95f4\u662f urn:oasis:names:tc:opendocument:xmlns:container\uff0c\u7528 getElementsByTagName(\\&#8221;rootfile\\&#8221;) \u65f6\u5982\u679c\u89e3\u6790\u4e0d\u5230\uff0c\u53ef\u4ee5\u6539\u7528 getElementsByTagNameNS \u5e76\u4f20\u5165\u547d\u540d\u7a7a\u95f4\u3002<\/p>\n<h4>3.3 \u89e3\u6790 OPF \u83b7\u53d6 spine \u987a\u5e8f<\/h4>\n<p>\u62ff\u5230 OPF \u8def\u5f84\u540e\uff0c\u518d\u6253\u5f00\u4e00\u6b21\u538b\u7f29\u5305\uff0c\u89e3\u6790 OPF \u83b7\u53d6\u6240\u6709 spine\uff08\u4e66\u810a\uff09\u987a\u5e8f\u3002\u8fd9\u51b3\u5b9a\u4e86\u8bfb\u8005\u7684\u7ffb\u9875\u903b\u8f91\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">parseChapterPaths<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> epubPath<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token class-name\">String<\/span> opfPath <span class=\"token operator\">=<\/span> <span class=\"token function\">findOpfPath<\/span><span class=\"token punctuation\">(<\/span>epubPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>opfPath <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;\u672a\u627e\u5230 OPF \u6587\u4ef6\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u89e3\u6790 OPF \u6240\u5728\u76ee\u5f55\uff0c\u7528\u4e8e\u62fc\u63a5\u76f8\u5bf9\u8def\u5f84<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> baseDir <span class=\"token operator\">=<\/span> opfPath<span class=\"token punctuation\">.<\/span><span class=\"token function\">substring<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> opfPath<span class=\"token punctuation\">.<\/span><span class=\"token function\">lastIndexOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token char\">\\&#8217;\/\\&#8217;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">+<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token class-name\">ZipInputStream<\/span> zis <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ZipInputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FileInputStream<\/span><span class=\"token punctuation\">(<\/span>epubPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">ZipEntry<\/span> entry<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> chapterPaths <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>entry <span class=\"token operator\">=<\/span> zis<span class=\"token punctuation\">.<\/span><span class=\"token function\">getNextEntry<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>opfPath<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            chapterPaths <span class=\"token operator\">=<\/span> <span class=\"token function\">parseSpine<\/span><span class=\"token punctuation\">(<\/span>zis<span class=\"token punctuation\">,<\/span> baseDir<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    zis<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> chapterPaths<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">parseSpine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InputStream<\/span> input<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> baseDir<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> paths <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">DocumentBuilderFactory<\/span> factory <span class=\"token operator\">=<\/span> <span class=\"token class-name\">DocumentBuilderFactory<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Document<\/span> doc <span class=\"token operator\">=<\/span> factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">newDocumentBuilder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parse<\/span><span class=\"token punctuation\">(<\/span>input<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b2c\u4e00\u6b65\uff1a\u5efa\u7acb idref -&gt; href \u7684\u6620\u5c04\uff08\u6765\u81ea manifest\uff09<\/span><br \/>\n    <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> idToHref <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">NodeList<\/span> manifestItems <span class=\"token operator\">=<\/span> doc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementsByTagName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;item\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> manifestItems<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLength<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">++<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token class-name\">Element<\/span> item <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Element<\/span><span class=\"token punctuation\">)<\/span> manifestItems<span class=\"token punctuation\">.<\/span><span class=\"token function\">item<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        idToHref<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;id\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> item<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;href\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7b2c\u4e8c\u6b65\uff1a\u6309 spine \u987a\u5e8f\u6536\u96c6\u7ae0\u8282\u8def\u5f84<\/span><br \/>\n    <span class=\"token class-name\">NodeList<\/span> spineItems <span class=\"token operator\">=<\/span> doc<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementsByTagName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;itemref\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> spineItems<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLength<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">++<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token class-name\">Element<\/span> itemref <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Element<\/span><span class=\"token punctuation\">)<\/span> spineItems<span class=\"token punctuation\">.<\/span><span class=\"token function\">item<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> idref <span class=\"token operator\">=<\/span> itemref<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;idref\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> href <span class=\"token operator\">=<\/span> idToHref<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>idref<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>href <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            paths<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>baseDir <span class=\"token operator\">+<\/span> href<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> paths<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f\uff1a\u89e3\u6790\u8fc7\u7a0b\u4e2d\u8981\u7559\u610f\u5b57\u7b26\u7f16\u7801\u95ee\u9898\u3002\u5f88\u591a\u8001\u4e66\u4f7f\u7528\u7684\u662f GBK \u800c\u975e UTF-8\uff0c\u9700\u8981\u6839\u636e XML \u58f0\u660e\u52a8\u6001\u8c03\u6574\u89e3\u7801\u65b9\u5f0f\u3002\u5efa\u8bae\u7528 DocumentBuilder \u65f6\u8bbe\u7f6e setCoalescing(true)\uff0c\u5e76\u5728\u8bfb\u53d6\u6d41\u65f6\u4f18\u5148\u6309 XML \u5934\u58f0\u660e\u7684\u7f16\u7801\u89e3\u7801\u3002<\/p>\n<h4>3.4 \u6784\u5efa\u9605\u8bfb\u89c6\u56fe\uff1a\u5206\u7ae0\u52a0\u8f7d\u7b56\u7565<\/h4>\n<p>\u6784\u5efa\u9605\u8bfb\u89c6\u56fe\u65f6\uff0c\u5efa\u8bae\u91c7\u7528\u201c\u5206\u7ae0\u52a0\u8f7d\u201d\u7b56\u7565\u3002\u4e0d\u8981\u8bd5\u56fe\u4e00\u6b21\u6027\u628a\u6240\u6709 HTML \u585e\u8fdb WebView\uff0c\u800c\u662f\u6839\u636e\u5f53\u524d\u9875\u7801\u52a8\u6001\u52a0\u8f7d\u5bf9\u5e94\u7684 XHTML \u6587\u4ef6\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">EpubReaderActivity<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">AppCompatActivity<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">WebView<\/span> webView<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> chapterPaths<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> currentChapter <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">onCreate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Bundle<\/span> savedInstanceState<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">onCreate<\/span><span class=\"token punctuation\">(<\/span>savedInstanceState<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">setContentView<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">R<\/span><span class=\"token punctuation\">.<\/span>layout<span class=\"token punctuation\">.<\/span>activity_epub_reader<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        webView <span class=\"token operator\">=<\/span> <span class=\"token function\">findViewById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">R<\/span><span class=\"token punctuation\">.<\/span>id<span class=\"token punctuation\">.<\/span>webView<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        webView<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSettings<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setJavaScriptEnabled<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        webView<span class=\"token punctuation\">.<\/span><span class=\"token function\">setLayerType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">View<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">LAYER_TYPE_HARDWARE<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        webView<span class=\"token punctuation\">.<\/span><span class=\"token function\">setWebViewClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LocalWebViewClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u89e3\u6790 EPUB \u5e76\u52a0\u8f7d\u7b2c\u4e00\u7ae0<\/span><br \/>\n        <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                chapterPaths <span class=\"token operator\">=<\/span> <span class=\"token class-name\">EpubParser<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">parseChapterPaths<\/span><span class=\"token punctuation\">(<\/span>bookPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">runOnUiThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token function\">loadChapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">loadChapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> index<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        currentChapter <span class=\"token operator\">=<\/span> index<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> chapterPath <span class=\"token operator\">=<\/span> chapterPaths<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>index<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u901a\u8fc7\u865a\u62df\u57df\u540d\u52a0\u8f7d\uff0c\u914d\u5408 LocalWebViewClient \u62e6\u622a<\/span><br \/>\n        webView<span class=\"token punctuation\">.<\/span><span class=\"token function\">loadUrl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;https:\/\/local.book\/\\&#8221;<\/span> <span class=\"token operator\">+<\/span> chapterPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3.5 \u5e73\u6ed1\u7ffb\u9875\uff1a\u9884\u52a0\u8f7d + \u624b\u52bf\u76d1\u542c<\/h4>\n<p>\u4e3a\u4e86\u5b9e\u73b0\u5e73\u6ed1\u7684\u7ffb\u9875\u6548\u679c\uff0c\u53ef\u4ee5\u7ed3\u5408 GestureDetector \u76d1\u542c\u5de6\u53f3\u6ed1\u52a8\u4e8b\u4ef6\u3002\u5f53\u7528\u6237\u6ed1\u52a8\u65f6\uff0c\u9884\u5148\u52a0\u8f7d\u4e0b\u4e00\u7ae0\u7684\u5185\u5bb9\u5230\u9690\u85cf\u7684 WebView \u4e2d\uff0c\u5f85\u52a8\u753b\u7ed3\u675f\u65f6\u77ac\u95f4\u5207\u6362\uff0c\u89c6\u89c9\u4e0a\u5c31\u5f62\u6210\u4e86\u65e0\u7f1d\u7ffb\u9875\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ChapterPreloader<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">WebView<\/span> currentView<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">WebView<\/span> nextView<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">GestureDetector<\/span> gestureDetector<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ChapterPreloader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">WebView<\/span> current<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">WebView<\/span> next<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>currentView <span class=\"token operator\">=<\/span> current<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>nextView <span class=\"token operator\">=<\/span> next<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>gestureDetector <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">GestureDetector<\/span><span class=\"token punctuation\">(<\/span>current<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">GestureDetector<span class=\"token punctuation\">.<\/span>SimpleOnGestureListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">onFling<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MotionEvent<\/span> e1<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">MotionEvent<\/span> e2<span class=\"token punctuation\">,<\/span><br \/>\n                                   <span class=\"token keyword\">float<\/span> velocityX<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">float<\/span> velocityY<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                <span class=\"token comment\">\/\/ \u5de6\u6ed1\u8fdb\u5165\u4e0b\u4e00\u7ae0<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>velocityX <span class=\"token operator\">&lt;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                    <span class=\"token function\">preloadNext<\/span><span class=\"token punctuation\">(<\/span>currentChapter <span class=\"token operator\">+<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token function\">switchToNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">preloadNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> nextIndex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5728\u9690\u85cf\u7684 nextView \u4e2d\u63d0\u524d\u52a0\u8f7d\u4e0b\u4e00\u7ae0<\/span><br \/>\n        nextView<span class=\"token punctuation\">.<\/span><span class=\"token function\">loadUrl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8221;https:\/\/local.book\/\\&#8221;<\/span> <span class=\"token operator\">+<\/span> chapterPaths<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>nextIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">switchToNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token comment\">\/\/ 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punctuation\">}<\/span><\/p>\n<h4>3.6 \u56fe\u7247\u61d2\u52a0\u8f7d\u4e0e\u5185\u5b58\u4f18\u5316<\/h4>\n<p>\u5bf9\u4e8e\u56fe\u7247\u8f83\u591a\u7684 EPUB\uff0c\u8fd8\u9700\u8981\u5b9e\u73b0\u7b80\u5355\u7684\u56fe\u7247\u61d2\u52a0\u8f7d\u903b\u8f91\uff0c\u9632\u6b62\u5185\u5b58\u6ea2\u51fa\u3002\u601d\u8def\u662f\u5728 HTML \u5c42\u9762\u62e6\u622a\u56fe\u7247\u8bf7\u6c42\uff0c\u53ea\u6709\u56fe\u7247\u8fdb\u5165\u53ef\u89c6\u533a\u57df\u65f6\u624d\u771f\u6b63\u52a0\u8f7d\uff1a<\/p>\n<p><span class=\"token comment\">\/\/ \u6ce8\u5165\u5230 WebView \u7684\u61d2\u52a0\u8f7d\u811a\u672c<\/span><br \/>\n<span class=\"token punctuation\">(<\/span><span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">var<\/span> images <span class=\"token operator\">=<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelectorAll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8217;img[data-src]\\&#8217;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">var<\/span> observer <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IntersectionObserver<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">entries<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        entries<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">entry<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span>isIntersecting<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                <span class=\"token keyword\">var<\/span> img <span class=\"token operator\">=<\/span> entry<span class=\"token punctuation\">.<\/span>target<span class=\"token punctuation\">;<\/span><br \/>\n                img<span class=\"token punctuation\">.<\/span>src <span class=\"token operator\">=<\/span> img<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8217;data-src\\&#8217;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                img<span class=\"token punctuation\">.<\/span><span class=\"token function\">removeAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\\&#8217;data-src\\&#8217;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                observer<span class=\"token punctuation\">.<\/span><span class=\"token function\">unobserve<\/span><span class=\"token punctuation\">(<\/span>img<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span> <span class=\"token literal-property property\">rootMargin<\/span><span class=\"token operator\">:<\/span> <span class=\"token string\">\\&#8217;200px\\&#8217;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    images<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">img<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span> observer<span class=\"token punctuation\">.<\/span><span class=\"token function\">observe<\/span><span class=\"token punctuation\">(<\/span>img<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u914d\u5408 LocalWebViewClient \u62e6\u622a\u56fe\u7247\u8bf7\u6c42\uff0c\u628a data-src \u91cc\u7684\u76f8\u5bf9\u8def\u5f84\u6620\u5c04\u5230\u672c\u5730\u8d44\u6e90\uff0c\u5c31\u80fd\u5b9e\u73b0\u6309\u9700\u52a0\u8f7d\uff0c\u663e\u8457\u964d\u4f4e\u5185\u5b58\u5360\u7528\u3002<\/p>\n<p>\u5e38\u89c1\u5751\u4f4d\uff1a<\/p>\n<ul>\n<li>\u767d\u5c4f\uff1a\u591a\u534a\u662f container.xml \u89e3\u6790\u5931\u8d25\u6216 OPF \u8def\u5f84\u62fc\u63a5\u9519\u8bef\uff0c\u5148\u6253\u5370 OPF \u8def\u5f84\u6838\u5bf9\u3002<\/li>\n<li>\u7ae0\u8282\u987a\u5e8f\u9519\u4e71\uff1a&lt;spine&gt; \u91cc\u7684 idref \u4e0e &lt;manifest&gt; \u7684 id \u5bf9\u4e0d\u4e0a\uff0c\u68c0\u67e5\u662f\u5426\u6f0f\u4e86\u6620\u5c04\u3002<\/li>\n<li>\u4e71\u7801\uff1a\u8001\u4e66\u7528 GBK \u7f16\u7801\uff0c\u52a1\u5fc5\u6309 XML \u58f0\u660e\u52a8\u6001\u89e3\u7801\uff0c\u4e0d\u8981\u786c\u7f16\u7801 UTF-8\u3002<\/li>\n<li>\u5185\u5b58\u6ea2\u51fa\uff1a\u56fe\u7247\u591a\u7684 EPUB \u4e00\u5b9a\u8981\u505a\u61d2\u52a0\u8f7d\uff0c\u5e76\u590d\u7528 WebView \u5b9e\u4f8b\uff0c\u53ca\u65f6 destroy() \u4e0d\u518d\u4f7f\u7528\u7684\u9875\u9762\u3002<\/li>\n<li>\u7ffb\u9875\u5361\u987f\uff1a\u9884\u52a0\u8f7d\u4e0b\u4e00\u7ae0\u65f6\u6ce8\u610f\u7ebf\u7a0b\u8c03\u5ea6\uff0c\u907f\u514d\u5728 UI \u7ebf\u7a0b\u505a\u6587\u4ef6 IO\u3002<\/li>\n<\/ul>\n<h3>\u2463 PDF \u6587\u4ef6\u6e32\u67d3\u4e0e\u5e73\u6ed1\u7ffb\u4e66\u52a8\u753b\u5236\u4f5c<\/h3>\n<p>PDF \u7684\u6e32\u67d3\u6bd4 EPUB \u66f4\u5177\u6311\u6218\u6027\uff0c\u56e0\u4e3a\u5b83\u901a\u5e38\u662f\u77e2\u91cf\u56fe\u5f62\u4e0e\u4f4d\u56fe\u7684\u6df7\u5408\u4f53\uff0c\u4e14\u4e0d\u652f\u6301\u91cd\u6392\u3002\u5728 Android \u7aef\uff0cPdfRenderer \u7c7b\u662f\u5b98\u65b9\u63d0\u4f9b\u7684\u8f7b\u91cf\u7ea7\u89e3\u51b3\u65b9\u6848\uff0c\u9002\u5408\u5927\u591a\u6570\u573a\u666f\u3002\u4e0b\u9762\u6211\u4eec\u4e00\u6b65\u6b65\u5b9e\u73b0\u4e00\u4e2a\u9ad8\u6027\u80fd\u7684 PDF \u6e32\u67d3\u5668\u4e0e\u4eff\u771f\u7ffb\u4e66\u52a8\u753b\u3002<\/p>\n<h4>4.1 \u7528 ParcelFileDescriptor \u6253\u5f00 PDF<\/h4>\n<p>PdfRenderer \u9700\u8981\u57fa\u4e8e ParcelFileDescriptor \u5de5\u4f5c\u3002\u6253\u5f00\u6587\u4ef6\u65f6\u8981\u6ce8\u610f\uff1aParcelFileDescriptor \u5fc5\u987b\u4fdd\u6301\u6253\u5f00\u72b6\u6001\uff0c\u76f4\u5230 PdfRenderer \u88ab\u5173\u95ed\uff0c\u5426\u5219\u6e32\u67d3\u4f1a\u5931\u8d25\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PdfDocument<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ParcelFileDescriptor<\/span> fd<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">PdfRenderer<\/span> renderer<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token keyword\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Context<\/span> context<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">File<\/span> pdfFile<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token comment\">\/\/ \u901a\u8fc7 FileProvider \u83b7\u53d6\u53ef\u8bfb\u7684 URI\uff0c\u517c\u5bb9 Android 10+ \u5206\u533a\u5b58\u50a8<\/span><br \/>\n            <span class=\"token class-name\">Uri<\/span> uri <span class=\"token operator\">=<\/span> <span class=\"token class-name\">FileProvider<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getUriForFile<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span><br \/>\n                    context<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPackageName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">+<\/span> <span class=\"token string\">\\&#8221;.fileprovider\\&#8221;<\/span><span class=\"token punctuation\">,<\/span> pdfFile<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            fd <span class=\"token operator\">=<\/span> context<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContentResolver<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">openFileDescriptor<\/span><span class=\"token punctuation\">(<\/span>uri<span class=\"token punctuation\">,<\/span> <span class=\"token string\">\\&#8221;r\\&#8221;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            renderer <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PdfRenderer<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getPageCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">return<\/span> renderer <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">?<\/span> renderer<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPageCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>renderer <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            renderer<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            renderer <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                fd<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            fd <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8981\u70b9\uff1aPdfRenderer \u548c ParcelFileDescriptor \u90fd\u5b9e\u73b0\u4e86 Closeable\uff0c\u52a1\u5fc5\u5728 finally \u5757\u6216 try-with-resources \u4e2d\u5173\u95ed\uff0c\u5426\u5219\u4f1a\u6cc4\u6f0f\u6587\u4ef6\u53e5\u67c4\uff0c\u5bfc\u81f4\u540e\u7eed\u6253\u5f00\u5176\u4ed6\u6587\u4ef6\u5931\u8d25\u3002<\/p>\n<h4>4.2 \u540e\u53f0\u7ebf\u7a0b\u6c60\u6e32\u67d3\u9875\u9762<\/h4>\n<p>\u6e32\u67d3\u662f CPU \u5bc6\u96c6\u578b\u64cd\u4f5c\uff0c\u7edd\u4e0d\u80fd\u653e\u5728\u4e3b\u7ebf\u7a0b\u3002\u6211\u4eec\u7528\u4e00\u4e2a\u7ebf\u7a0b\u6c60\u6765\u6267\u884c\u6e32\u67d3\u4efb\u52a1\uff0c\u5e76\u901a\u8fc7 Handler \u628a\u7ed3\u679c\u56de\u4f20\u5230 UI \u7ebf\u7a0b\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PdfRenderTask<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Runnable<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">PdfRenderer<\/span> renderer<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> pageIndex<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> targetWidth<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u76ee\u6807\u5bbd\u5ea6\uff0c\u6309\u5c4f\u5e55\u5bbd\u5ea6\u7f29\u653e<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ImageView<\/span> imageView<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Handler<\/span> uiHandler<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">PdfRenderTask<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">PdfRenderer<\/span> renderer<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> pageIndex<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> targetWidth<span class=\"token punctuation\">,<\/span><br \/>\n                         <span class=\"token class-name\">ImageView<\/span> imageView<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Handler<\/span> uiHandler<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>renderer <span class=\"token operator\">=<\/span> renderer<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>pageIndex <span class=\"token operator\">=<\/span> pageIndex<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>targetWidth <span class=\"token operator\">=<\/span> targetWidth<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>imageView <span class=\"token operator\">=<\/span> imageView<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>uiHandler <span class=\"token operator\">=<\/span> uiHandler<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token class-name\">PdfRenderer<span class=\"token punctuation\">.<\/span>Page<\/span> page <span class=\"token operator\">=<\/span> renderer<span class=\"token punctuation\">.<\/span><span class=\"token function\">openPage<\/span><span class=\"token punctuation\">(<\/span>pageIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6309\u76ee\u6807\u5bbd\u5ea6\u7b49\u6bd4\u7f29\u653e\uff0c\u907f\u514d\u521b\u5efa\u8d85\u5927 Bitmap<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> pageWidth <span class=\"token operator\">=<\/span> page<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWidth<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> pageHeight <span class=\"token operator\">=<\/span> page<span class=\"token punctuation\">.<\/span><span class=\"token function\">getHeight<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">float<\/span> scale <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">float<\/span><span class=\"token punctuation\">)<\/span> targetWidth <span class=\"token operator\">\/<\/span> pageWidth<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> scaledHeight <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">(<\/span>pageHeight <span class=\"token operator\">*<\/span> scale<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token class-name\">Bitmap<\/span> bitmap <span class=\"token operator\">=<\/span> <span class=\"token class-name\">Bitmap<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">createBitmap<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                    targetWidth<span class=\"token punctuation\">,<\/span> scaledHeight<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Bitmap<span class=\"token punctuation\">.<\/span>Config<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">ARGB_8888<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u767d\u8272\u80cc\u666f\uff0c\u907f\u514d\u900f\u660e\u533a\u57df\u663e\u793a\u9ed1\u8272<\/span><br \/>\n            bitmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">eraseColor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Color<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">WHITE<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">render<\/span><span class=\"token punctuation\">(<\/span>bitmap<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">PdfRenderer<span class=\"token punctuation\">.<\/span>Page<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">RENDER_MODE_FOR_DISPLAY<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            uiHandler<span class=\"token punctuation\">.<\/span><span class=\"token function\">post<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> imageView<span class=\"token punctuation\">.<\/span><span class=\"token function\">setImageBitmap<\/span><span class=\"token punctuation\">(<\/span>bitmap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728 Activity \u4e2d\uff0c\u7528\u7ebf\u7a0b\u6c60\u8c03\u5ea6\u6e32\u67d3\u4efb\u52a1\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PdfReaderActivity<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">AppCompatActivity<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token constant\">THREAD_COUNT<\/span> <span class=\"token operator\">=<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ExecutorService<\/span> renderPool<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Handler<\/span> uiHandler<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">PdfDocument<\/span> pdfDocument<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ViewPager2<\/span> viewPager<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">onCreate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Bundle<\/span> savedInstanceState<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">onCreate<\/span><span class=\"token punctuation\">(<\/span>savedInstanceState<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">setContentView<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">R<\/span><span class=\"token punctuation\">.<\/span>layout<span class=\"token punctuation\">.<\/span>activity_pdf_reader<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        renderPool <span class=\"token operator\">=<\/span> <span class=\"token class-name\">Executors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newFixedThreadPool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">THREAD_COUNT<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        uiHandler <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Handler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Looper<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getMainLooper<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        pdfDocument <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PdfDocument<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>pdfDocument<span class=\"token punctuation\">.<\/span><span class=\"token keyword\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> bookFile<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token class-name\">Toast<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">makeText<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\\&#8221;PDF \u6253\u5f00\u5931\u8d25\\&#8221;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Toast<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">LENGTH_SHORT<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">show<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">finish<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        viewPager <span class=\"token operator\">=<\/span> <span class=\"token function\">findViewById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">R<\/span><span class=\"token punctuation\">.<\/span>id<span class=\"token punctuation\">.<\/span>viewPager<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        viewPager<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PdfPageAdapter<\/span><span class=\"token punctuation\">(<\/span>pdfDocument<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        viewPager<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPageTransformer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">BookPageTransformer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">onDestroy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">onDestroy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        renderPool<span class=\"token punctuation\">.<\/span><span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        pdfDocument<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6027\u80fd\u63d0\u793a\uff1a\u7ebf\u7a0b\u6c60\u5927\u5c0f\u5efa\u8bae\u8bbe\u4e3a 2\uff0c\u65e2\u80fd\u5e76\u884c\u6e32\u67d3\u76f8\u90bb\u4e24\u9875\uff0c\u53c8\u4e0d\u4f1a\u56e0\u7ebf\u7a0b\u8fc7\u591a\u62a2\u5360 CPU \u5bfc\u81f4\u5361\u987f\u3002\u6e32\u67d3\u5206\u8fa8\u7387\u6309\u5c4f\u5e55\u5bbd\u5ea6\u7f29\u653e\uff0c\u907f\u514d\u4e3a\u9ad8\u6e05 PDF \u521b\u5efa\u8d85\u5927 Bitmap \u5f15\u53d1\u5185\u5b58\u6ea2\u51fa\u3002<\/p>\n<h4>4.3 \u7528 ViewPager2 \u5b9e\u73b0\u7ffb\u9875<\/h4>\n<p>ViewPager2 \u5929\u7136\u652f\u6301\u5de6\u53f3\u6ed1\u52a8\u7ffb\u9875\uff0c\u914d\u5408 RecyclerView.Adapter \u53ef\u4ee5\u9ad8\u6548\u590d\u7528\u9875\u9762\u89c6\u56fe\u3002\u6bcf\u4e2a\u9875\u9762\u53ea\u663e\u793a\u4e00\u5f20\u6e32\u67d3\u597d\u7684 Bitmap\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PdfPageAdapter<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">RecyclerView<span class=\"token punctuation\">.<\/span>Adapter<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">PdfPageAdapter<span class=\"token punctuation\">.<\/span>PageHolder<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">PdfDocument<\/span> pdfDocument<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">PdfPageAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">PdfDocument<\/span> pdfDocument<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>pdfDocument <span class=\"token operator\">=<\/span> pdfDocument<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">PageHolder<\/span> <span class=\"token function\">onCreateViewHolder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ViewGroup<\/span> parent<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> viewType<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token class-name\">ImageView<\/span> imageView <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ImageView<\/span><span class=\"token punctuation\">(<\/span>parent<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        imageView<span class=\"token punctuation\">.<\/span><span class=\"token function\">setScaleType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ImageView<span class=\"token punctuation\">.<\/span>ScaleType<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">FIT_CENTER<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PageHolder<\/span><span class=\"token punctuation\">(<\/span>imageView<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">onBindViewHolder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">PageHolder<\/span> holder<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> position<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token comment\">\/\/ \u89e6\u53d1\u540e\u53f0\u6e32\u67d3\uff0c\u6e32\u67d3\u5b8c\u6210\u540e\u56de\u586b Bitmap<\/span><br \/>\n        <span class=\"token class-name\">PdfRenderTask<\/span> task <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PdfRenderTask<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                pdfDocument<span class=\"token punctuation\">.<\/span><span class=\"token function\">getRenderer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> position<span class=\"token punctuation\">,<\/span><br \/>\n                holder<span class=\"token punctuation\">.<\/span>imageView<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWidth<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> holder<span class=\"token punctuation\">.<\/span>imageView<span class=\"token punctuation\">,<\/span> uiHandler<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        renderPool<span class=\"token punctuation\">.<\/span><span class=\"token function\">execute<\/span><span class=\"token punctuation\">(<\/span>task<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getItemCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">return<\/span> pdfDocument<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPageCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PageHolder<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">RecyclerView<span class=\"token punctuation\">.<\/span>ViewHolder<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ImageView<\/span> imageView<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">PageHolder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ImageView<\/span> imageView<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>imageView<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>imageView <span class=\"token operator\">=<\/span> imageView<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.4 \u81ea\u5b9a\u4e49 PageTransformer \u5b9e\u73b0\u4eff\u771f\u5377\u9875<\/h4>\n<p>\u5355\u7eaf\u7684\u5de6\u53f3\u6ed1\u52a8\u663e\u5f97\u751f\u786c\u3002\u6211\u4eec\u81ea\u5b9a\u4e49\u4e00\u4e2a PageTransformer\uff0c\u6839\u636e\u9875\u9762\u7684\u504f\u79fb\u91cf\u8ba1\u7b97\u9634\u5f71\u6e10\u53d8\u548c\u5f62\u53d8\u77e9\u9635\uff0c\u8425\u9020\u51fa 3D \u7ffb\u4e66\u7684\u89c6\u89c9\u9519\u89c9\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">BookPageTransformer<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">ViewPager2<span class=\"token punctuation\">.<\/span>PageTransformer<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">float<\/span> <span class=\"token constant\">MAX_ANGLE<\/span> <span class=\"token operator\">=<\/span> <span class=\"token number\">90f<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">float<\/span> <span class=\"token constant\">SHADOW_ALPHA<\/span> <span class=\"token operator\">=<\/span> <span class=\"token number\">0.5f<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">transformPage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">View<\/span> page<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">float<\/span> position<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token comment\">\/\/ position: 0 \u8868\u793a\u5f53\u524d\u9875\uff0c-1 \u8868\u793a\u5de6\u4fa7\u9875\uff0c1 \u8868\u793a\u53f3\u4fa7\u9875<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>position <span class=\"token operator\">&lt;=<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">||<\/span> position <span class=\"token operator\">&gt;=<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token comment\">\/\/ \u9875\u9762\u5b8c\u5168\u79bb\u5f00\u5c4f\u5e55\uff0c\u6062\u590d\u9ed8\u8ba4\u72b6\u6001<\/span><br \/>\n            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">setRotationY<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAlpha<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1f<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u53ea\u5bf9\u5de6\u4fa7\u7ffb\u8d77\u7684\u9875\u9762\u505a\u5377\u9875\u6548\u679c<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>position <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token comment\">\/\/ \u7ed5 Y \u8f74\u65cb\u8f6c\uff0c\u6a21\u62df\u7eb8\u5f20\u7ffb\u8d77<\/span><br \/>\n            <span class=\"token keyword\">float<\/span> rotation <span class=\"token operator\">=<\/span> <span class=\"token constant\">MAX_ANGLE<\/span> <span class=\"token operator\">*<\/span> position<span class=\"token punctuation\">;<\/span><br \/>\n            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPivotX<\/span><span class=\"token punctuation\">(<\/span>page<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWidth<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">0.5f<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPivotY<\/span><span class=\"token punctuation\">(<\/span>page<span class=\"token punctuation\">.<\/span><span class=\"token function\">getHeight<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">0.5f<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">setRotationY<\/span><span class=\"token punctuation\">(<\/span>rotation<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6839\u636e\u7ffb\u8d77\u89d2\u5ea6\u53e0\u52a0\u9634\u5f71\uff0c\u8d8a\u7ffb\u8d8a\u6697<\/span><br \/>\n            <span class=\"token keyword\">float<\/span> shadowAlpha <span class=\"token operator\">=<\/span> <span class=\"token constant\">SHADOW_ALPHA<\/span> <span class=\"token operator\">*<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">abs<\/span><span class=\"token punctuation\">(<\/span>position<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAlpha<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1f<\/span> <span class=\"token operator\">&#8211;<\/span> shadowAlpha<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token comment\">\/\/ \u53f3\u4fa7\u9875\u9762\u4fdd\u6301\u6b63\u5e38\uff0c\u7565\u5fae\u538b\u6697\u4ee5\u7a81\u51fa\u524d\u666f<\/span><br \/>\n            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">setRotationY<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            page<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAlpha<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1f<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">0.1f<\/span> <span class=\"token operator\">*<\/span> position<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8bf4\u660e\uff1asetRotationY \u914d\u5408 pivotX\/pivotY \u53ef\u4ee5\u505a\u51fa\u7ed5\u4e66\u810a\u65cb\u8f6c\u7684\u6548\u679c\u3002\u4e3a\u4e86\u66f4\u903c\u771f\uff0c\u8fd8\u53ef\u4ee5\u5728 onDraw \u9636\u6bb5\u52a8\u6001\u7ed8\u5236\u4e00\u4e2a\u4e09\u89d2\u5f62\u906e\u7f69\u6a21\u62df\u7eb8\u5f20\u5377\u8d77\u7684\u9634\u5f71\uff0c\u968f\u7740\u624b\u6307\u79fb\u52a8\u6539\u53d8\u906e\u7f69\u5927\u5c0f\u3002\u8fd9\u91cc\u7ed9\u51fa\u7684\u662f\u8f7b\u91cf\u5b9e\u73b0\uff0c\u517c\u987e\u6027\u80fd\u4e0e\u89c6\u89c9\u6548\u679c\u3002<\/p>\n<h4>4.5 \u5185\u5b58\u4f18\u5316\uff1aBitmap \u590d\u7528\u4e0e\u7f13\u5b58\u6c60<\/h4>\n<p>PDF \u9875\u9762\u6e32\u67d3\u4f1a\u4ea7\u751f\u5927\u91cf Bitmap\uff0c\u5982\u679c\u4e0d\u52a0\u63a7\u5236\uff0c\u5f88\u5bb9\u6613\u89e6\u53d1 OOM\u3002\u63a8\u8350\u505a\u6cd5\u662f\u7ef4\u62a4\u4e00\u4e2a LruCache \u7f13\u5b58\u6700\u8fd1\u6e32\u67d3\u7684\u9875\u9762\uff0c\u5e76\u590d\u7528\u4e0d\u518d\u4f7f\u7528\u7684 Bitmap\uff1a<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PdfBitmapCache<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">LruCache<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Bitmap<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> cache<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">PdfBitmapCache<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> maxSize<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token comment\">\/\/ maxSize \u5355\u4f4d\u662f KB\uff0c\u8fd9\u91cc\u6309 1\/8 \u5e94\u7528\u5185\u5b58\u4f30\u7b97<\/span><br \/>\n        cache <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LruCache<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Bitmap<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span>maxSize<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n            <span class=\"token annotation punctuation\">@Override<\/span><br \/>\n            <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">sizeOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Integer<\/span> key<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Bitmap<\/span> value<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n                <span class=\"token keyword\">return<\/span> value<span class=\"token punctuation\">.<\/span><span class=\"token function\">getByteCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Bitmap<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> pageIndex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token keyword\">return<\/span> cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>pageIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> pageIndex<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Bitmap<\/span> bitmap<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>pageIndex<span class=\"token punctuation\">,<\/span> bitmap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">clear<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">evictAll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728 onBindViewHolder \u4e2d\u5148\u67e5\u7f13\u5b58\uff0c\u547d\u4e2d\u5219\u76f4\u63a5\u663e\u793a\uff0c\u672a\u547d\u4e2d\u624d\u89e6\u53d1\u6e32\u67d3\uff1a<\/p>\n<p><span class=\"token annotation punctuation\">@Override<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">onBindViewHolder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">PageHolder<\/span> holder<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> position<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token class-name\">Bitmap<\/span> cached <span class=\"token operator\">=<\/span> bitmapCache<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>position<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cached <span class=\"token operator\">!=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        holder<span class=\"token punctuation\">.<\/span>imageView<span class=\"token punctuation\">.<\/span><span class=\"token function\">setImageBitmap<\/span><span class=\"token punctuation\">(<\/span>cached<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n        <span class=\"token comment\">\/\/ \u89e6\u53d1\u540e\u53f0\u6e32\u67d3\uff0c\u5b8c\u6210\u540e\u5199\u5165\u7f13\u5b58\u5e76\u56de\u586b<\/span><br \/>\n        <span class=\"token class-name\">PdfRenderTask<\/span> task <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PdfRenderTask<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                pdfDocument<span class=\"token punctuation\">.<\/span><span class=\"token function\">getRenderer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> position<span class=\"token punctuation\">,<\/span><br \/>\n                holder<span class=\"token punctuation\">.<\/span>imageView<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWidth<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> holder<span class=\"token punctuation\">.<\/span>imageView<span class=\"token punctuation\">,<\/span> uiHandler<span class=\"token punctuation\">,<\/span><br \/>\n                bitmapCache<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        renderPool<span class=\"token punctuation\">.<\/span><span class=\"token function\">execute<\/span><span class=\"token punctuation\">(<\/span>task<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5e38\u89c1\u5751\u4f4d\uff1a<\/p>\n<ul>\n<li>\u5361\u987f\uff1a\u6e32\u67d3\u653e\u5728\u4e3b\u7ebf\u7a0b\u662f\u6700\u5927\u5143\u51f6\uff0c\u52a1\u5fc5\u7528\u7ebf\u7a0b\u6c60 + Handler \u56de\u4f20\u3002<\/li>\n<li>OOM\uff1a\u4e0d\u8981\u6309\u539f\u59cb\u5206\u8fa8\u7387\u6e32\u67d3\uff0c\u6309\u5c4f\u5e55\u5bbd\u5ea6\u7f29\u653e\uff1b\u914d\u5408 LruCache \u63a7\u5236\u7f13\u5b58\u4e0a\u9650\u3002<\/li>\n<li>\u6587\u4ef6\u53e5\u67c4\u6cc4\u6f0f\uff1aPdfRenderer \u548c ParcelFileDescriptor \u8bb0\u5f97\u6210\u5bf9\u5173\u95ed\u3002<\/li>\n<li>\u7ffb\u9875\u751f\u786c\uff1aPageTransformer \u91cc\u540c\u65f6\u5904\u7406\u65cb\u8f6c\u4e0e\u9634\u5f71\uff0c\u89c6\u89c9\u66f4\u81ea\u7136\u3002<\/li>\n<li>Android 10+ \u6253\u4e0d\u5f00\u6587\u4ef6\uff1a\u7528 FileProvider \u751f\u6210\u5171\u4eab URI\uff0c\u4e0d\u8981\u76f4\u63a5\u4f20\u6587\u4ef6\u8def\u5f84\u3002<\/li>\n<\/ul>\n<h3>\u2464 Office \u6587\u6863\u9884\u89c8\u4e0e TBS \u5185\u6838\u96c6\u6210<\/h3>\n<p>Word\u3001Excel\u3001PPT \u7b49 Office \u6587\u6863\u7684\u89e3\u6790\u6700\u4e3a\u590d\u6742\uff0c\u81ea\u884c\u5b9e\u73b0\u6210\u672c\u6781\u9ad8\u3002\u4e1a\u754c\u901a\u7528\u7684\u505a\u6cd5\u662f\u96c6\u6210\u6210\u719f\u7684\u7b2c\u4e09\u65b9\u5185\u6838\uff0c\u5176\u4e2d\u817e\u8baf TBS\uff08Tencent Browser Service\uff09\u5185\u6838\u5728\u4e2d\u6587\u6587\u6863\u517c\u5bb9\u6027\u65b9\u9762\u8868\u73b0\u4f18\u5f02\u3002\u4e0b\u9762\u6211\u4eec\u4e00\u6b65\u6b65\u5b8c\u6210 TBS \u7684\u63a5\u5165\u3001\u521d\u59cb\u5316\u4e0e Office \u6587\u6863\u9884\u89c8\u3002<\/p>\n<h4>5.1 \u63a5\u5165 TBS SDK \u4e0e\u4f9d\u8d56\u914d\u7f6e<\/h4>\n<p>\u9996\u5148\u5728 build.gradle \u4e2d\u5f15\u5165 TBS \u7684\u4f9d\u8d56\u3002TBS \u5185\u6838\u4ee5 AAR \u5f62\u5f0f\u63d0\u4f9b\uff0c\u9700\u8981\u5728 repositories \u4e2d\u58f0\u660e\u817e\u8baf\u7684\u4ed3\u5e93\u5730\u5740\uff1a<\/p>\n<p>repositories <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    maven <span class=\"token punctuation\">{<\/p>\n<p>   <\/span> url <span class=\"token interpolation-string\"><span class=\"token string\">\\&#8221;https:\/\/mirrors.tencent.com\/repository\/maven\/tencent_public\/\\&#8221;<\/span><\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>dependencies <span class=\"token punctuation\">{<\/p>\n<p>   <\/span><br \/>\n    <span class=\"token comment\">\/\/ TBS \u5185\u6838 SDK<\/span><br \/>\n    implementation <span class=\"token string\">\\&#8217;com.tencent.tbs:tbssdk:44286\\&#8217;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f\uff1aTBS SDK \u7248\u672c\u53f7\u4f1a\u968f\u5185\u6838\u66f4\u65b0\u800c\u53d8\u5316\uff0c\u5efa\u8bae\u5230\u817e\u8baf TBS \u5b98\u7f51\u67e5\u8be2\u6700\u65b0\u7a33\u5b9a\u7248\u3002\u63a5\u5165\u540e\u8bb0\u5f97\u5728 AndroidManifest.xml \u4e2d\u58f0\u660e\u7f51\u7edc\u6743\u9650\uff0c\u56e0\u4e3a TBS 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