{"id":69954,"date":"2026-02-01T08:25:41","date_gmt":"2026-02-01T00:25:41","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/69954.html"},"modified":"2026-02-01T08:25:41","modified_gmt":"2026-02-01T00:25:41","slug":"flutter-for-openharmony-%e5%ae%9e%e6%88%98%e4%b9%8b%e5%9f%ba%e7%a1%80%e7%bb%84%e4%bb%b6%ef%bc%9a%e7%ac%ac%e4%ba%94%e7%af%87-image-%e5%9b%be%e7%89%87%e7%bb%84%e4%bb%b6%e4%b8%8e%e8%b5%84%e6%ba%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/69954.html","title":{"rendered":"Flutter for OpenHarmony \u5b9e\u6218\u4e4b\u57fa\u7840\u7ec4\u4ef6\uff1a\u7b2c\u4e94\u7bc7 Image \u56fe\u7247\u7ec4\u4ef6\u4e0e\u8d44\u6e90\u7ba1\u7406"},"content":{"rendered":"<h2>Flutter for OpenHarmony \u5b9e\u6218\u4e4b\u57fa\u7840\u7ec4\u4ef6&#xff1a;\u7b2c\u4e94\u7bc7 Image \u56fe\u7247\u7ec4\u4ef6\u4e0e\u8d44\u6e90\u7ba1\u7406<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260201002540-697e9d844b4a0.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u524d\u8a00<\/h3>\n<p>\u4e00\u4e2a\u7cbe\u7f8e\u7684 App \u79bb\u4e0d\u5f00\u9ad8\u8d28\u91cf\u7684\u56fe\u7247\u3002\u5728 Flutter for OpenHarmony \u4e2d&#xff0c;\u56fe\u7247\u7684\u52a0\u8f7d\u8fdc\u4e0d\u6b62 Image.network \u8fd9\u4e48\u7b80\u5355\u3002<\/p>\n<p>\u6211\u4eec\u9700\u8981\u8003\u8651&#xff1a;<\/p>\n<ul>\n<li>\u7f51\u7edc\u56fe\u7247\u52a0\u8f7d\u6162\u600e\u4e48\u529e&#xff1f;&#xff08;Loading \u5360\u4f4d&#xff09;<\/li>\n<li>\u56fe\u7247\u52a0\u8f7d\u5931\u8d25\u663e\u793a\u4ec0\u4e48&#xff1f;&#xff08;Error Widget&#xff09;<\/li>\n<li>\u5982\u4f55\u6839\u636e\u4e0d\u540c\u5c4f\u5e55\u5bc6\u5ea6\u52a0\u8f7d 2x\/3x \u56fe&#xff1f;<\/li>\n<li>\u5217\u8868\u5feb\u901f\u6ed1\u52a8\u65f6\u5982\u4f55\u4f18\u5316\u5185\u5b58&#xff1f;<\/li>\n<\/ul>\n<p>\u672c\u6587\u4f60\u5c06\u5b66\u5230&#xff1a;<\/p>\n<ul>\n<li>Image \u7ec4\u4ef6\u7684 4 \u79cd\u52a0\u8f7d\u6a21\u5f0f<\/li>\n<li>BoxFit \u9002\u914d\u6a21\u5f0f\u5168\u56fe\u89e3<\/li>\n<li>\u5b9e\u73b0\u5706\u89d2\u56fe\u7247\u7684 3 \u79cd\u65b9\u5f0f<\/li>\n<li>\u4f7f\u7528 cached_network_image \u5b9e\u73b0\u9ad8\u6548\u7f13\u5b58<\/li>\n<li>\u9e3f\u8499\u8d44\u6e90\u6587\u4ef6 (Assets) \u7684\u914d\u7f6e\u4e0e\u8bfb\u53d6<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e00\u3001Image \u57fa\u7840\u52a0\u8f7d\u6a21\u5f0f<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260201002540-697e9d8465e35.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>Flutter \u63d0\u4f9b\u4e86\u591a\u79cd\u6784\u9020\u51fd\u6570\u6765\u52a0\u8f7d\u4e0d\u540c\u6765\u6e90\u7684\u56fe\u7247\u3002<\/p>\n<h4>1.1 \u52a0\u8f7d\u7f51\u7edc\u56fe\u7247<\/h4>\n<p>\u6700\u5e38\u7528\u7684\u65b9\u5f0f&#xff0c;\u652f\u6301 WebP\u3001JPEG\u3001PNG\u3001GIF (\u542b\u52a8\u753b) \u7b49\u683c\u5f0f\u3002<\/p>\n<p><span class=\"token class-name\">Image<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">network<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  <span class=\"token string-literal\"><span class=\"token string\">&#039;https:\/\/example.com\/flutter_ohos.png&#039;<\/span><\/span><span class=\"token punctuation\">,<\/span><br \/>\n  width<span class=\"token punctuation\">:<\/span> <span class=\"token number\">300<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  height<span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  fit<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">BoxFit<\/span><span class=\"token punctuation\">.<\/span>cover<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u586b\u5145\u6a21\u5f0f<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<h4>1.2 \u52a0\u8f7d\u672c\u5730\u8d44\u6e90 (Assets)<\/h4>\n<p>\u52a0\u8f7d\u6253\u5305\u5728 App \u5b89\u88c5\u5305\u5185\u7684\u56fe\u7247\u3002<\/p>\n<p>\u6b65\u9aa4 1&#xff1a;\u914d\u7f6e pubspec.yaml<\/p>\n<p><span class=\"token key atrule\">flutter<\/span><span class=\"token punctuation\">:<\/span><br \/>\n  <span class=\"token key atrule\">assets<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token punctuation\">&#8211;<\/span> assets\/images\/logo.png<br \/>\n    <span class=\"token punctuation\">&#8211;<\/span> assets\/images\/banner.jpg<\/p>\n<p>\u6b65\u9aa4 2&#xff1a;\u4ee3\u7801\u8c03\u7528<\/p>\n<p><span class=\"token class-name\">Image<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asset<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  <span class=\"token string-literal\"><span class=\"token string\">&#039;assets\/images\/logo.png&#039;<\/span><\/span><span class=\"token punctuation\">,<\/span><br \/>\n  width<span class=\"token punctuation\">:<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<h4>1.3 \u52a0\u8f7d\u6587\u4ef6\u7cfb\u7edf\u56fe\u7247 (File)<\/h4>\n<p>\u901a\u5e38\u7528\u4e8e\u663e\u793a\u7528\u6237\u76f8\u518c\u9009\u62e9\u6216\u76f8\u673a\u62cd\u6444\u7684\u7167\u7247\u3002<\/p>\n<p><span class=\"token class-name\">Image<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">file<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">File<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#039;\/path\/to\/image.jpg&#039;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h3>\u4e8c\u3001BoxFit \u9002\u914d\u6a21\u5f0f\u56fe\u89e3<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260201002540-697e9d8482c47.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>fit \u5c5e\u6027\u51b3\u5b9a\u4e86\u56fe\u7247\u5982\u4f55\u9002\u5e94\u5bb9\u5668\u7684\u5c3a\u5bf8\u3002\u8fd9\u662f\u5e03\u5c40\u4e2d\u6700\u5bb9\u6613\u8ff7\u60d1\u7684\u5730\u65b9\u3002<\/p>\n<table>\n<tr>\u6a21\u5f0f\u63cf\u8ff0\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>BoxFit.contain<\/td>\n<td>(\u9ed8\u8ba4) \u7b49\u6bd4\u7f29\u653e&#xff0c;\u5b8c\u5168\u663e\u793a\u56fe\u7247&#xff0c;\u53ef\u80fd\u7559\u767d<\/td>\n<td>\u8be6\u60c5\u9875\u770b\u5927\u56fe<\/td>\n<\/tr>\n<tr>\n<td>BoxFit.cover<\/td>\n<td>\u7b49\u6bd4\u7f29\u653e&#xff0c;\u586b\u6ee1\u5bb9\u5668&#xff0c;\u8d85\u51fa\u90e8\u5206\u88ab\u88c1\u526a<\/td>\n<td>\u6700\u5e38\u7528&#xff0c;Banner\u3001\u5934\u50cf<\/td>\n<\/tr>\n<tr>\n<td>BoxFit.fill<\/td>\n<td>\u62c9\u4f38\u586b\u6ee1&#xff0c;\u56fe\u7247\u4f1a\u53d8\u5f62<\/td>\n<td>\u4e0d\u63a8\u8350&#xff0c;\u9664\u975e\u4e3a\u4e86\u80cc\u666f\u94fa\u6ee1<\/td>\n<\/tr>\n<tr>\n<td>BoxFit.fitWidth<\/td>\n<td>\u5bbd\u5ea6\u586b\u6ee1&#xff0c;\u9ad8\u5ea6\u81ea\u9002\u5e94 (\u53ef\u80fd\u88c1\u526a\u9876\/\u5e95)<\/td>\n<td>\u5b9a\u5bbd\u5217\u8868\u9879<\/td>\n<\/tr>\n<tr>\n<td>BoxFit.fitHeight<\/td>\n<td>\u9ad8\u5ea6\u586b\u6ee1&#xff0c;\u5bbd\u5ea6\u81ea\u9002\u5e94<\/td>\n<td>\u6a2a\u5411\u6eda\u52a8\u5217\u8868<\/td>\n<\/tr>\n<tr>\n<td>BoxFit.none<\/td>\n<td>\u4e0d\u7f29\u653e&#xff0c;\u6309\u539f\u56fe\u5927\u5c0f\u5c45\u4e2d\u663e\u793a<\/td>\n<td>\u539f\u59cb\u5c3a\u5bf8\u5c55\u793a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  width<span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  height<span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>grey<span class=\"token punctuation\">[<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Image<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">network<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    url<span class=\"token punctuation\">,<\/span><br \/>\n    fit<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">BoxFit<\/span><span class=\"token punctuation\">.<\/span>cover<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u88c1\u5207\u586b\u6ee1<\/span><br \/>\n  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h3>\u4e09\u3001\u8fdb\u9636\u6280\u5de7&#xff1a;\u5360\u4f4d\u56fe\u4e0e\u9519\u8bef\u5904\u7406<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260201002540-697e9d8495977.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u76f4\u63a5\u7528 Image.network \u5728\u7f51\u901f\u6162\u65f6\u4f1a\u7559\u767d&#xff0c;\u4f53\u9a8c\u4e0d\u597d\u3002<\/p>\n<h4>3.1 \u4f7f\u7528 FrameBuilder (\u539f\u751f\u65b9\u5f0f)<\/h4>\n<p><span class=\"token class-name\">Image<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">network<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  <span class=\"token string-literal\"><span class=\"token string\">&#039;https:\/\/example.com\/large_image.jpg&#039;<\/span><\/span><span class=\"token punctuation\">,<\/span><br \/>\n  loadingBuilder<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> child<span class=\"token punctuation\">,<\/span> loadingProgress<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>loadingProgress <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> child<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Center<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">CircularProgressIndicator<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        value<span class=\"token punctuation\">:<\/span> loadingProgress<span class=\"token punctuation\">.<\/span>expectedTotalBytes <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><br \/>\n            <span class=\"token operator\">?<\/span> loadingProgress<span class=\"token punctuation\">.<\/span>cumulativeBytesLoaded <span class=\"token operator\">\/<\/span><br \/>\n              loadingProgress<span class=\"token punctuation\">.<\/span>expectedTotalBytes<span class=\"token operator\">!<\/span><br \/>\n            <span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">null<\/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 punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  errorBuilder<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">,<\/span> stackTrace<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token class-name\">Column<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      mainAxisAlignment<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">MainAxisAlignment<\/span><span class=\"token punctuation\">.<\/span>center<span class=\"token punctuation\">,<\/span><br \/>\n      children<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n        <span class=\"token class-name\">Icon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Icons<\/span><span class=\"token punctuation\">.<\/span>error<span class=\"token punctuation\">,<\/span> color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>red<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#039;\u52a0\u8f7d\u5931\u8d25&#039;<\/span><\/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 punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h3>\u56db\u3001\u56fe\u7247\u88c1\u526a\u4e0e\u5706\u89d2<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260201002540-697e9d84ac971.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>4.1 CircleAvatar (\u5706\u5f62\u5934\u50cf)<\/h4>\n<p>\u4e13\u95e8\u7528\u4e8e\u5934\u50cf&#xff0c;\u81ea\u5e26\u5706\u5f62\u88c1\u5207\u3002<\/p>\n<p><span class=\"token class-name\">CircleAvatar<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  radius<span class=\"token punctuation\">:<\/span> <span class=\"token number\">40<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  backgroundImage<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">NetworkImage<\/span><span class=\"token punctuation\">(<\/span>avatarUrl<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<h4>4.2 ClipRRect (\u5706\u89d2\u77e9\u5f62)<\/h4>\n<p>\u6700\u901a\u7528\u7684\u88c1\u5207\u7ec4\u4ef6\u3002<\/p>\n<p><span class=\"token class-name\">ClipRRect<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  borderRadius<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">BorderRadius<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">circular<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Image<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">network<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    imageUrl<span class=\"token punctuation\">,<\/span><br \/>\n    width<span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    height<span class=\"token punctuation\">:<\/span> <span class=\"token number\">120<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    fit<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">BoxFit<\/span><span class=\"token punctuation\">.<\/span>cover<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<h4>4.3 ClipOval (\u692d\u5706\/\u5706\u5f62)<\/h4>\n<p>\u5c06\u975e\u6b63\u65b9\u5f62\u56fe\u7247\u88c1\u5207\u4e3a\u5706\u5f62\u6216\u692d\u5706\u3002<\/p>\n<p><span class=\"token class-name\">ClipOval<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Image<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#039;assets\/avatar.jpg&#039;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h3>\u4e94\u3001OpenHarmony \u8d44\u6e90\u9002\u914d\u6307\u5357<\/h3>\n<h4>5.1 \u591a\u500d\u56fe\u9002\u914d (2.0x, 3.0x)<\/h4>\n<p>Flutter \u4f7f\u7528 \u903b\u8f91\u50cf\u7d20\u3002\u5728\u4e0d\u540c\u50cf\u7d20\u5bc6\u5ea6\u7684\u8bbe\u5907\u4e0a&#xff0c;\u9700\u8981\u52a0\u8f7d\u4e0d\u540c\u6e05\u6670\u5ea6\u7684\u56fe\u7247\u3002<\/p>\n<p>\u5982\u679c\u4f60\u7684\u4ee3\u7801\u662f&#xff1a;<\/p>\n<p><span class=\"token class-name\">Image<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#039;assets\/images\/icon.png&#039;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4f60\u9700\u8981\u6784\u5efa\u5982\u4e0b\u76ee\u5f55\u7ed3\u6784&#xff1a;<\/p>\n<p>assets\/<br \/>\n  images\/<br \/>\n    icon.png      (1.0x \u57fa\u51c6\u56fe&#xff0c;\u5bf9\u5e94\u4f4e\u5206\u5c4f)<br \/>\n    2.0x\/<br \/>\n      icon.png    (2.0x \u9ad8\u6e05\u56fe&#xff0c;\u5bf9\u5e94\u666e\u901a\u624b\u673a)<br \/>\n    3.0x\/<br \/>\n      icon.png    (3.0x \u8d85\u6e05\u56fe&#xff0c;\u5bf9\u5e94\u65d7\u8230\u673a\/\u5e73\u677f)<\/p>\n<p>Flutter \u4f1a\u6839\u636e\u5f53\u524d\u8bbe\u5907\u7684 devicePixelRatio \u81ea\u52a8\u52a0\u8f7d\u5bf9\u5e94\u7684\u56fe\u7247&#xff01;<\/p>\n<h4>5.2 \u77e2\u91cf\u56fe SVG<\/h4>\n<p>\u4e3a\u4e86\u8fdb\u4e00\u6b65\u51cf\u5c11\u5305\u4f53\u79ef\u5e76\u9002\u914d\u4efb\u610f\u5206\u8fa8\u7387&#xff0c;\u63a8\u8350\u4f7f\u7528 SVG\u3002\u9700\u8981\u5f15\u5165 flutter_svg \u5e93\u3002<\/p>\n<p><span class=\"token class-name\">SvgPicture<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asset<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  <span class=\"token string-literal\"><span class=\"token string\">&#039;assets\/icons\/heart.svg&#039;<\/span><\/span><span class=\"token punctuation\">,<\/span><br \/>\n  width<span class=\"token punctuation\">:<\/span> <span class=\"token number\">24<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  height<span class=\"token punctuation\">:<\/span> <span class=\"token number\">24<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  colorFilter<span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token class-name\">ColorFilter<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">mode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>red<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">BlendMode<\/span><span class=\"token punctuation\">.<\/span>srcIn<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u52a8\u6001\u67d3\u8272<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h3>\u516d\u3001\u5b9e\u6218&#xff1a;\u5c01\u88c5\u901a\u7528\u56fe\u7247\u7ec4\u4ef6<\/h3>\n<p>\u6211\u4eec\u5728\u9879\u76ee\u4e2d\u901a\u5e38\u4f1a\u5c01\u88c5\u4e00\u4e2a\u7edf\u4e00\u7684\u56fe\u7247\u7ec4\u4ef6&#xff0c;\u7edf\u4e00\u5904\u7406\u7f13\u5b58\u3001\u5706\u89d2\u548c\u5360\u4f4d\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token string-literal\"><span class=\"token string\">&#039;package:flutter\/material.dart&#039;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token string-literal\"><span class=\"token string\">&#039;package:cached_network_image\/cached_network_image.dart&#039;<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/\/ \u901a\u7528\u56fe\u7247\u7ec4\u4ef6 &#8211; \u7edf\u4e00\u5904\u7406 \u7f13\u5b58\u3001\u5706\u89d2\u3001\u5360\u4f4d\u4e0e\u9519\u8bef<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CommonImage<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">StatelessWidget<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> imageUrl<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">final<\/span> double<span class=\"token operator\">?<\/span> width<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">final<\/span> double<span class=\"token operator\">?<\/span> height<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">final<\/span> double radius<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">BoxFit<\/span> fit<span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">const<\/span> <span class=\"token class-name\">CommonImage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span>key<span class=\"token punctuation\">,<\/span><br \/>\n    required <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>imageUrl<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>width<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>radius <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>fit <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">BoxFit<\/span><span class=\"token punctuation\">.<\/span>cover<span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  <span class=\"token class-name\">Widget<\/span> <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BuildContext<\/span> context<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ 1. \u5904\u7406\u5706\u89d2<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">ClipRRect<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      borderRadius<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">BorderRadius<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">circular<\/span><span class=\"token punctuation\">(<\/span>radius<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token comment\">\/\/ 2. \u4f7f\u7528\u7f13\u5b58\u56fe\u7247 (\u652f\u6301\u5185\u5b58\u548c\u78c1\u76d8\u53cc\u91cd\u7f13\u5b58)<\/span><br \/>\n      child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">CachedNetworkImage<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        imageUrl<span class=\"token punctuation\">:<\/span> imageUrl<span class=\"token punctuation\">,<\/span><br \/>\n        width<span class=\"token punctuation\">:<\/span> width<span class=\"token punctuation\">,<\/span><br \/>\n        height<span class=\"token punctuation\">:<\/span> height<span class=\"token punctuation\">,<\/span><br \/>\n        fit<span class=\"token punctuation\">:<\/span> fit<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token comment\">\/\/ 3. \u7edf\u4e00\u5360\u4f4d\u56fe (\u9aa8\u67b6\u5c4f\u6548\u679c)<\/span><br \/>\n        placeholder<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> url<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span><br \/>\n          width<span class=\"token punctuation\">:<\/span> width<span class=\"token punctuation\">,<\/span><br \/>\n          height<span class=\"token punctuation\">:<\/span> height<span class=\"token punctuation\">,<\/span><br \/>\n          color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>grey<span class=\"token punctuation\">[<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          child<span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token class-name\">Center<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Icon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Icons<\/span><span class=\"token punctuation\">.<\/span>image<span class=\"token punctuation\">,<\/span> color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>grey<span class=\"token punctuation\">,<\/span> size<span class=\"token punctuation\">:<\/span> <span class=\"token number\">30<\/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 punctuation\">,<\/span><br \/>\n        <span class=\"token comment\">\/\/ 4. \u7edf\u4e00\u9519\u8bef\u56fe<\/span><br \/>\n        errorWidget<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> url<span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span><br \/>\n          width<span class=\"token punctuation\">:<\/span> width<span class=\"token punctuation\">,<\/span><br \/>\n          height<span class=\"token punctuation\">:<\/span> height<span class=\"token punctuation\">,<\/span><br \/>\n          color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>grey<span class=\"token punctuation\">[<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          child<span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token class-name\">Column<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            mainAxisAlignment<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">MainAxisAlignment<\/span><span class=\"token punctuation\">.<\/span>center<span class=\"token punctuation\">,<\/span><br \/>\n            children<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n              <span class=\"token class-name\">Icon<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Icons<\/span><span class=\"token punctuation\">.<\/span>broken_image<span class=\"token punctuation\">,<\/span> color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>grey<span class=\"token punctuation\">,<\/span> size<span class=\"token punctuation\">:<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              <span class=\"token class-name\">SizedBox<\/span><span class=\"token punctuation\">(<\/span>height<span class=\"token punctuation\">:<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#039;\u52a0\u8f7d\u5931\u8d25&#039;<\/span><\/span><span class=\"token punctuation\">,<\/span> style<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">TextStyle<\/span><span class=\"token punctuation\">(<\/span>fontSize<span class=\"token punctuation\">:<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>grey<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><br \/>\n          <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 punctuation\">,<\/span><br \/>\n    <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><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260201002540-697e9d84bcbdd.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<h3>\u4e03\u3001\u603b\u7ed3<\/h3>\n<p>Image \u7ec4\u4ef6\u662f App \u5185\u5bb9\u5c55\u793a\u7684\u6838\u5fc3\u3002<\/p>\n<h4>\u6838\u5fc3\u8981\u70b9<\/h4>\n<li>\u52a0\u8f7d\u65b9\u5f0f&#xff1a;\u7f51\u7edc\u56fe\u7528 CachedNetworkImage&#xff0c;\u672c\u5730\u56fe\u7528 Asset\u3002<\/li>\n<li>\u9002\u914d\u6a21\u5f0f&#xff1a;\u7262\u8bb0 BoxFit.cover \u662f\u4e07\u91d1\u6cb9\u3002<\/li>\n<li>\u591a\u500d\u56fe&#xff1a;\u5229\u7528 2.0x\/3.0x \u6587\u4ef6\u5939\u5b9e\u73b0\u81ea\u52a8\u5206\u8fa8\u7387\u9002\u914d\u3002<\/li>\n<li>\u6027\u80fd&#xff1a;\u5217\u8868\u4e2d\u7684\u56fe\u7247\u52a1\u5fc5\u8bbe\u7f6e memCacheHeight \u4ee5\u51cf\u5c11\u5185\u5b58\u5360\u7528&#xff0c;\u9632\u6b62 OOM (Out Of Memory)\u3002<\/li>\n<h4>\u4e0b\u4e00\u7bc7\u9884\u544a<\/h4>\n<p>\u56fe\u7247\u901a\u5e38\u4e0d\u4f1a\u5355\u72ec\u5b58\u5728&#xff0c;\u800c\u662f\u5b58\u5728\u4e8e\u957f\u5217\u8868\u4e2d\u3002 \u300aFlutter for OpenHarmony 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