{"id":107733,"date":"2026-09-20T05:59:00","date_gmt":"2026-09-19T21:59:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/107733.html"},"modified":"2026-09-20T05:59:00","modified_gmt":"2026-09-19T21:59:00","slug":"jvm%e3%80%81%e5%86%85%e5%ad%98%e4%b8%8e-android-oom%ef%bc%9a%e4%bb%8e-gc-root-%e8%bf%bd%e5%88%b0%e4%b8%80%e6%ac%a1%e9%a1%b5%e9%9d%a2%e6%b3%84%e6%bc%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/107733.html","title":{"rendered":"JVM\u3001\u5185\u5b58\u4e0e Android OOM\uff1a\u4ece GC Root \u8ffd\u5230\u4e00\u6b21\u9875\u9762\u6cc4\u6f0f"},"content":{"rendered":"<p>\u7ebf\u4e0a\u56fe\u7247\u8be6\u60c5\u9875\u8fde\u7eed\u65cb\u8f6c\u51e0\u6b21\u540e&#xff0c;\u65e7 Activity \u5df2\u7ecf\u9000\u51fa&#xff0c;\u5185\u5b58\u66f2\u7ebf\u5374\u6ca1\u6709\u56de\u843d&#xff1b;\u968f\u540e\u5217\u8868\u7ee7\u7eed\u52a0\u8f7d\u5927\u56fe&#xff0c;ART \u65e0\u6cd5\u6ee1\u8db3\u4e00\u6b21\u5206\u914d\u65f6\u4f1a\u629b\u51fa OutOfMemoryError&#xff0c;\u82e5\u9519\u8bef\u672a\u88ab\u5904\u7406&#xff0c;\u5e94\u7528\u8fdb\u7a0b\u901a\u5e38\u4f1a\u5d29\u6e83\u3002Android \u4e5f\u53ef\u80fd\u5728\u72ec\u7acb\u7684\u7cfb\u7edf\u5185\u5b58\u538b\u529b\u7b56\u7565\u4e0b\u6740\u6b7b\u540e\u53f0\u8fdb\u7a0b&#xff0c;\u4f46\u90a3\u4e0d\u662f\u8fd9\u6b21 Java \u5206\u914d\u5931\u8d25\u672c\u8eab\u3002\u8868\u9762\u73b0\u8c61\u662f\u201c\u56fe\u7247\u592a\u5927\u201d&#xff0c;\u771f\u6b63\u8981\u5148\u56de\u7b54\u7684\u95ee\u9898\u662f&#xff1a;\u65e7\u9875\u9762\u4e3a\u4ec0\u4e48\u4ecd\u7136\u4ece\u67d0\u4e2a GC Root \u53ef\u8fbe&#xff0c;\u8c01\u53c8\u5728\u6301\u7eed\u5236\u9020\u5206\u914d\u538b\u529b&#xff1f;<\/p>\n<h3>\u4e00\u53e5\u8bdd\u7ed3\u8bba<\/h3>\n<p>Android OOM \u4e0d\u662f\u201c\u5806\u53d8\u5927\u201d\u8fd9\u4e00\u6761\u7ed3\u8bba&#xff0c;\u800c\u662f\u8fdb\u7a0b\u5728 ART \u7684\u53ef\u7528\u5185\u5b58\u3001\u56de\u6536\u65f6\u673a\u548c\u5206\u914d\u538b\u529b\u7ea6\u675f\u4e0b\u65e0\u6cd5\u518d\u6ee1\u8db3\u4e00\u6b21\u5206\u914d&#xff1b;\u5148\u6cbf\u6700\u77ed\u8def\u5f84\u627e\u51fa GC Root \u5230\u5bf9\u8c61\u7684\u6301\u6709\u94fe&#xff0c;\u518d\u5206\u522b\u4fee\u6b63\u751f\u547d\u5468\u671f\u6240\u6709\u6743\u3001\u7f13\u5b58\u4e0a\u9650\u548c\u56fe\u7247\u89e3\u7801\u7b56\u7565\u3002<\/p>\n<p>\u7248\u672c\u4e0e\u8fb9\u754c&#xff1a; \u672c\u6587\u7528 Java 8 \u8bed\u8a00\u6a21\u578b\u89e3\u91ca\u5f15\u7528\u4e0e\u5806\u6808&#xff0c;\u5e76\u4ee5\u73b0\u4ee3 Android\/ART \u7684\u6982\u5ff5\u884c\u4e3a\u4e3a\u8fb9\u754c&#xff1b;ART \u7684\u5177\u4f53 GC \u7b97\u6cd5\u3001\u5206\u4ee3\u7b56\u7565\u3001\u5806\u4e0a\u9650\u4e0e\u5382\u5546\u8c03\u5ea6\u4f1a\u968f Android \u7248\u672c\u3001\u8bbe\u5907\u548c OEM \u5b9e\u73b0\u53d8\u5316\u3002Zygote\u3001ART\u3001Activity\u3001Bitmap\u3001LeakCanary \u98ce\u683c\u7684\u5f15\u7528\u89c2\u5bdf\u4e0e Android Studio Memory Profiler \u5747\u662f Android \u8bed\u5883&#xff1b;\u5b83\u4eec\u4e0d\u80fd\u88ab\u7b80\u5355\u7b49\u540c\u4e8e\u684c\u9762 HotSpot JVM \u7684\u5b9e\u73b0\u7ec6\u8282\u3002<\/p>\n<h3>\u5148\u628a\u4e00\u6b21\u6cc4\u6f0f\u753b\u6210\u53ef\u8fbe\u6027<\/h3>\n<p>Java \u7684 GC \u5224\u5b9a\u4e0d\u662f\u201c\u5bf9\u8c61\u591a\u4e45\u6ca1\u7528\u201d&#xff0c;\u800c\u662f\u4ece\u4e00\u7ec4\u6839\u51fa\u53d1&#xff0c;\u770b\u5bf9\u8c61\u662f\u5426\u4ecd\u53ef\u8fbe\u3002heap dump \u5e38\u89c1\u7684\u6839\u7c7b\u522b\u5305\u62ec\u7ebf\u7a0b\u6808\u3001\u9759\u6001\u6216\u7cfb\u7edf\u7c7b\u5b57\u6bb5\u3001JNI \u5168\u5c40\u5f15\u7528\u548c\u8fd0\u884c\u4e2d\u7684\u7ebf\u7a0b&#xff1b;\u5177\u4f53\u540d\u79f0\u4ee5\u5206\u6790\u5668\u8f93\u51fa\u4e3a\u51c6\u3002\u7cfb\u7edf\u670d\u52a1\u5bf9\u8c61\u53ef\u4ee5\u51fa\u73b0\u5728\u4e00\u6761\u4fdd\u7559\u8def\u5f84\u4e0a&#xff0c;\u5374\u4e0d\u662f\u53ef\u4e0e\u8fd9\u4e9b\u7c7b\u522b\u5e76\u5217\u7684\u901a\u7528 GC Root \u7c7b\u522b\u3002<\/p>\n<p>#mermaid-svg-TlVjdETfPesuSdtE{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-TlVjdETfPesuSdtE .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-TlVjdETfPesuSdtE .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-TlVjdETfPesuSdtE .error-icon{fill:#552222;}#mermaid-svg-TlVjdETfPesuSdtE .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-TlVjdETfPesuSdtE .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-TlVjdETfPesuSdtE .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-TlVjdETfPesuSdtE .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-TlVjdETfPesuSdtE .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-TlVjdETfPesuSdtE .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-TlVjdETfPesuSdtE .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-TlVjdETfPesuSdtE .marker{fill:#333333;stroke:#333333;}#mermaid-svg-TlVjdETfPesuSdtE .marker.cross{stroke:#333333;}#mermaid-svg-TlVjdETfPesuSdtE svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-TlVjdETfPesuSdtE p{margin:0;}#mermaid-svg-TlVjdETfPesuSdtE .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-TlVjdETfPesuSdtE .cluster-label text{fill:#333;}#mermaid-svg-TlVjdETfPesuSdtE .cluster-label span{color:#333;}#mermaid-svg-TlVjdETfPesuSdtE .cluster-label span p{background-color:transparent;}#mermaid-svg-TlVjdETfPesuSdtE .label text,#mermaid-svg-TlVjdETfPesuSdtE span{fill:#333;color:#333;}#mermaid-svg-TlVjdETfPesuSdtE .node rect,#mermaid-svg-TlVjdETfPesuSdtE .node circle,#mermaid-svg-TlVjdETfPesuSdtE .node ellipse,#mermaid-svg-TlVjdETfPesuSdtE .node polygon,#mermaid-svg-TlVjdETfPesuSdtE .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-TlVjdETfPesuSdtE .rough-node .label text,#mermaid-svg-TlVjdETfPesuSdtE .node .label text,#mermaid-svg-TlVjdETfPesuSdtE .image-shape .label,#mermaid-svg-TlVjdETfPesuSdtE .icon-shape .label{text-anchor:middle;}#mermaid-svg-TlVjdETfPesuSdtE .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-TlVjdETfPesuSdtE .rough-node .label,#mermaid-svg-TlVjdETfPesuSdtE .node .label,#mermaid-svg-TlVjdETfPesuSdtE .image-shape .label,#mermaid-svg-TlVjdETfPesuSdtE .icon-shape .label{text-align:center;}#mermaid-svg-TlVjdETfPesuSdtE .node.clickable{cursor:pointer;}#mermaid-svg-TlVjdETfPesuSdtE .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-TlVjdETfPesuSdtE .arrowheadPath{fill:#333333;}#mermaid-svg-TlVjdETfPesuSdtE .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-TlVjdETfPesuSdtE .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-TlVjdETfPesuSdtE .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-TlVjdETfPesuSdtE .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-TlVjdETfPesuSdtE .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-TlVjdETfPesuSdtE .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-TlVjdETfPesuSdtE .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-TlVjdETfPesuSdtE .cluster text{fill:#333;}#mermaid-svg-TlVjdETfPesuSdtE .cluster span{color:#333;}#mermaid-svg-TlVjdETfPesuSdtE div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-TlVjdETfPesuSdtE .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-TlVjdETfPesuSdtE rect.text{fill:none;stroke-width:0;}#mermaid-svg-TlVjdETfPesuSdtE .icon-shape,#mermaid-svg-TlVjdETfPesuSdtE .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-TlVjdETfPesuSdtE .icon-shape p,#mermaid-svg-TlVjdETfPesuSdtE .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-TlVjdETfPesuSdtE .icon-shape .label rect,#mermaid-svg-TlVjdETfPesuSdtE .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-TlVjdETfPesuSdtE .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-TlVjdETfPesuSdtE .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-TlVjdETfPesuSdtE :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"nodeLabel\"><\/p>\n<p>GC Root&#xff1a;\u4e3b\u7ebf\u7a0b\u6808<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Activity&#xff1a;\u56fe\u7247\u8be6\u60c5\u9875<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>GC Root&#xff1a;\u9759\u6001\u5b57\u6bb5<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Singleton&#xff1a;\u5168\u5c40\u7ba1\u7406\u5668<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>GC Root&#xff1a;JNI \u5168\u5c40\u5f15\u7528<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Native&#xff1a;\u8de8\u8fb9\u754c\u6301\u6709<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Callback&#xff1a;\u533f\u540d\u5185\u90e8\u56de\u8c03<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Activity&#xff1a;\u65cb\u8f6c\u524d\u9875\u9762<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>View&#xff1a;\u56fe\u7247\u5bb9\u5668<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Bitmap&#xff1a;\u89e3\u7801\u540e\u7684\u50cf\u7d20<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Bitmap&#xff1a;\u65e7\u9875\u9762\u50cf\u7d20<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>ART GC&#xff1a;\u6807\u8bb0\u53ef\u8fbe\u5bf9\u8c61<\/p>\n<p><\/span><\/p>\n<p>\u8c01\u521b\u5efa&#xff1a;\u7cfb\u7edf\u521b\u5efa\u8fdb\u7a0b\u3001\u7ebf\u7a0b\u548c\u9875\u9762&#xff0c;\u4e1a\u52a1\u4ee3\u7801\u521b\u5efa\u5355\u4f8b\u3001\u56de\u8c03\u4e0e\u4f4d\u56fe&#xff1b;\u8c01\u6301\u6709&#xff1a;GC Root \u76f4\u63a5\u6216\u95f4\u63a5\u6301\u6709\u53ef\u8fbe\u5bf9\u8c61&#xff1b;\u4f55\u65f6\u89e6\u53d1&#xff1a;\u65cb\u8f6c\u540e\u65e7\u9875\u9762\u5e94\u5931\u53bb\u6240\u6709\u6743&#xff0c;\u4f46\u957f\u671f\u5355\u4f8b\u4e2d\u7684\u56de\u8c03\u4ecd\u7136\u6307\u5411\u5b83&#xff1b;\u7ed3\u679c\u4ea4\u7ed9\u8c01&#xff1a;GC \u53ea\u4f1a\u56de\u6536\u4e0d\u53ef\u8fbe\u5bf9\u8c61&#xff0c;\u56e0\u6b64\u65e7 Activity \u4e0e\u5176 Bitmap \u4f1a\u7ee7\u7eed\u5360\u7528\u5185\u5b58\u3002\u8fd9\u91cc\u7684 GC Root \u662f\u5206\u6790\u672f\u8bed&#xff0c;\u4e0d\u662f\u4e00\u4e2a\u53ef\u7531\u5e94\u7528\u968f\u610f new \u51fa\u6765\u7684 Java \u7c7b\u3002<\/p>\n<h3>JVM \u6982\u5ff5\u5982\u4f55\u843d\u5230 ART \u8fdb\u7a0b<\/h3>\n<h4>\u7c7b\u52a0\u8f7d\u3001\u6808\u4e0e\u5806<\/h4>\n<p>Java \u7c7b\u4ece\u5b57\u8282\u7801\u88ab\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u3001\u94fe\u63a5\u5e76\u521d\u59cb\u5316\u540e&#xff0c;\u9759\u6001\u5b57\u6bb5\u4e0e\u7c7b\u578b\u5143\u6570\u636e\u6309\u8fd0\u884c\u65f6\u5b9e\u73b0\u7ba1\u7406\u3002Android APK \u4e2d\u7684 DEX \u7531 ART \u6267\u884c\u6216 AOT\/JIT \u7f16\u8bd1&#xff1b;\u8fd9\u4fdd\u7559\u4e86 Java \u7684\u201c\u5bf9\u8c61\u901a\u8fc7\u5f15\u7528\u8bbf\u95ee\u201d\u548c\u201c\u65b9\u6cd5\u8c03\u7528\u6709\u6808\u5e27\u201d\u7684\u5b66\u4e60\u6a21\u578b&#xff0c;\u4f46\u4e0d\u610f\u5473\u7740 ART \u4f7f\u7528 HotSpot \u7684\u540c\u4e00\u5185\u5b58\u5e03\u5c40\u6216\u540c\u4e00\u56de\u6536\u5668\u3002<\/p>\n<ul>\n<li>Java \u6808&#xff1a; \u6bcf\u4e2a\u7ebf\u7a0b\u7684\u8c03\u7528\u6808\u4fdd\u5b58\u6808\u5e27\u3001\u5c40\u90e8\u53d8\u91cf\u3001\u53c2\u6570\u548c\u8fd4\u56de\u5730\u5740\u3002\u6808\u5e27\u91cc\u7684\u5f15\u7528\u53ef\u4ee5\u8ba9\u5806\u5bf9\u8c61\u4fdd\u6301\u53ef\u8fbe&#xff1b;\u6808\u6ea2\u51fa\u548c\u5806 OOM \u662f\u4e0d\u540c\u95ee\u9898\u3002<\/li>\n<li>Java \u5806&#xff1a; new \u51fa\u6765\u7684\u5bf9\u8c61\u901a\u5e38\u7531\u8fd0\u884c\u65f6\u5806\u7ba1\u7406&#xff1b;\u6570\u7ec4\u3001\u96c6\u5408\u8282\u70b9\u3001\u9875\u9762\u6811\u53ca Java \u5c42\u7684 Bitmap \u5305\u88c5\u5bf9\u8c61\u90fd\u4f53\u73b0\u4e3a\u5bf9\u8c61\u5f15\u7528\u5173\u7cfb\u3002\u5806\u589e\u957f\u672c\u8eab\u53ea\u662f\u73b0\u8c61&#xff0c;\u53ef\u80fd\u662f\u6b63\u5e38\u7f13\u5b58\u3001\u4e00\u6b21\u6027\u5cf0\u503c\u3001\u788e\u7247\u6216\u771f\u6b63\u7684\u4fdd\u7559\u94fe\u3002<\/li>\n<li>\u5bf9\u8c61\u5f15\u7528&#xff1a; \u53d8\u91cf\u4fdd\u5b58\u7684\u662f\u5bf9\u8c61\u5f15\u7528&#xff0c;\u4e0d\u662f\u5bf9\u8c61\u526f\u672c\u3002\u628a Activity \u4f20\u7ed9\u957f\u751f\u547d\u5468\u671f\u5bf9\u8c61&#xff0c;\u76f8\u5f53\u4e8e\u628a\u201c\u8fd9\u4e2a\u9875\u9762\u6d3b\u591a\u4e45\u201d\u7684\u51b3\u5b9a\u6743\u4ea4\u7ed9\u4e86\u66f4\u957f\u7684\u6240\u6709\u8005\u3002<\/li>\n<\/ul>\n<h4>Zygote\u3001ART \u4e0e\u5e94\u7528\u8fdb\u7a0b\u8fb9\u754c<\/h4>\n<p>Android \u542f\u52a8\u5e94\u7528\u65f6&#xff0c;\u5e38\u89c1\u8def\u5f84\u662f Zygote \u9884\u52a0\u8f7d\u4e00\u90e8\u5206\u8fd0\u884c\u65f6\u548c\u6846\u67b6\u8d44\u6e90&#xff0c;\u518d fork \u51fa\u5e94\u7528\u8fdb\u7a0b&#xff1b;\u5e94\u7528\u8fdb\u7a0b\u5728 ART \u4e2d\u8fd0\u884c\u81ea\u5df1\u7684 Java\/Kotlin \u4ee3\u7801\u3001\u7ebf\u7a0b\u548c\u5806\u3002\u9884\u52a0\u8f7d\u4e0e copy-on-write \u6709\u52a9\u4e8e\u542f\u52a8\u548c\u5171\u4eab&#xff0c;\u4f46\u5b83\u4e0d\u8ba9\u5e94\u7528\u968f\u610f\u5171\u4eab\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u7684 Java \u5806&#xff0c;\u4e5f\u4e0d\u66ff\u5e94\u7528\u4fee\u590d\u6cc4\u6f0f\u3002<\/p>\n<p>\u6765\u6e90\u4e8b\u5b9e&#xff1a; ART \u662f Android \u7684\u5e94\u7528\u8fd0\u884c\u65f6&#xff0c;Zygote \u662f\u521b\u5efa\u5e94\u7528\u8fdb\u7a0b\u7684\u91cd\u8981\u7cfb\u7edf\u673a\u5236\u3002 \u751f\u4ea7\u5efa\u8bae&#xff1a; \u628a\u201c\u5e94\u7528\u8fdb\u7a0b\u53ef\u80fd\u88ab\u6740\u540e\u91cd\u5efa\u201d\u89c6\u4e3a\u5e38\u6001&#xff0c;\u4e0d\u628a\u5355\u4f8b\u7f13\u5b58\u5f53\u6210\u53ef\u9760\u6301\u4e45\u5316&#xff1b;\u540c\u65f6\u628a\u201c\u540c\u4e00\u8fdb\u7a0b\u5185\u9759\u6001\u5b57\u6bb5\u80fd\u8de8\u65cb\u8f6c\u5b58\u6d3b\u201d\u5f53\u6210\u6cc4\u6f0f\u5ba1\u67e5\u70b9\u3002<\/p>\n<h3>\u5f15\u7528\u5f3a\u5ea6\u4e0d\u662f\u4e07\u80fd\u5f00\u5173<\/h3>\n<table>\n<tr>\u5f15\u7528\u7c7b\u578b\u53ef\u8fbe\u6027\u8bed\u4e49\u5408\u7406\u7528\u9014\u4e0d\u80fd\u66ff\u4ee3\u4ec0\u4e48<\/tr>\n<tbody>\n<tr>\n<td>\u5f3a\u5f15\u7528<\/td>\n<td>\u53ea\u8981\u4ece GC Root \u94fe\u8def\u53ef\u8fbe&#xff0c;\u5bf9\u8c61\u901a\u5e38\u4e0d\u4f1a\u88ab\u56de\u6536<\/td>\n<td>\u9ed8\u8ba4\u4e1a\u52a1\u5bf9\u8c61\u3001\u660e\u786e\u6240\u6709\u6743<\/td>\n<td>\u751f\u547d\u5468\u671f\u8bbe\u8ba1&#xff1b;\u9519\u8bef\u5f3a\u5f15\u7528\u4ecd\u4f1a\u6cc4\u6f0f<\/td>\n<\/tr>\n<tr>\n<td>\u8f6f\u5f15\u7528<\/td>\n<td>\u5185\u5b58\u7d27\u5f20\u65f6\u66f4\u53ef\u80fd\u88ab\u56de\u6536&#xff0c;\u5177\u4f53\u65f6\u673a\u4e0d\u5e94\u4f5c\u4e3a\u4e1a\u52a1\u5951\u7ea6<\/td>\n<td>\u5c11\u91cf\u53ef\u91cd\u5efa\u3001\u975e\u5173\u952e\u7684\u5185\u5b58\u63d0\u793a\u6570\u636e<\/td>\n<td>\u6709\u754c\u56fe\u7247\u7f13\u5b58&#xff1b;\u56de\u6536\u4e0d\u53ef\u9884\u6d4b<\/td>\n<\/tr>\n<tr>\n<td>\u5f31\u5f15\u7528<\/td>\n<td>\u6ca1\u6709\u5f3a\u5f15\u7528\u65f6\u53ef\u5728\u540e\u7eed GC \u56de\u6536<\/td>\n<td>\u89c2\u5bdf\u5668\u3001\u6620\u5c04\u952e\u7b49\u7279\u5b9a\u6a21\u5f0f<\/td>\n<td>\u901a\u7528\u6cc4\u6f0f\u4fee\u590d&#xff1b;\u53ef\u80fd\u8fc7\u65e9\u5931\u6548\u3001\u63a9\u76d6\u6240\u6709\u6743\u9519\u8bef<\/td>\n<\/tr>\n<tr>\n<td>\u865a\u5f15\u7528<\/td>\n<td>\u4e0d\u80fd\u901a\u8fc7\u5b83\u53d6\u5f97\u5bf9\u8c61&#xff0c;\u53ea\u80fd\u914d\u5408 ReferenceQueue \u89c2\u5bdf\u56de\u6536\u540e\u5904\u7406<\/td>\n<td>\u8d44\u6e90\u6e05\u7406\u901a\u77e5\u4e0e\u8bca\u65ad\u57fa\u7840\u8bbe\u65bd<\/td>\n<td>Java \u4e1a\u52a1\u5bf9\u8c61\u7684\u6b63\u5e38\u8bbf\u95ee\u4e0e\u53ca\u65f6\u5173\u95ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5f31\u5f15\u7528\u53ea\u80fd\u6539\u53d8\u201c\u8fd9\u6761\u8fb9\u662f\u5426\u4fdd\u6d3b\u201d&#xff0c;\u4e0d\u80fd\u53d6\u6d88\u5df2\u7ecf\u6392\u961f\u7684\u4efb\u52a1\u3001\u4e0d\u80fd\u4fdd\u8bc1\u56de\u8c03\u5728\u4e3b\u7ebf\u7a0b\u3001\u4e5f\u4e0d\u80fd\u8ba9\u8d44\u6e90\u9a6c\u4e0a\u91ca\u653e\u3002\u4e00\u4e2a\u56de\u8c03\u5373\u4f7f\u53ea\u5f31\u6301\u6709 Activity&#xff0c;\u4ecd\u53ef\u80fd\u6301\u6709\u5927\u6570\u7ec4\u3001Bitmap \u6216\u9519\u8bef\u5730\u5728\u9875\u9762\u5df2\u505c\u6b62\u540e\u66f4\u65b0 UI\u3002\u751f\u4ea7\u4ee3\u7801\u5e94\u5148\u5efa\u7acb\u660e\u786e\u7684\u53d6\u6d88\u548c\u89e3\u7ed1\u8fb9\u754c&#xff0c;\u518d\u5728\u786e\u5b9e\u9700\u8981\u89c2\u5bdf\u800c\u4e0d\u62e5\u6709\u5bf9\u8c61\u65f6\u4f7f\u7528\u5f31\u5f15\u7528\u3002<\/p>\n<h3>\u65cb\u8f6c\u65f6&#xff0c;\u957f\u751f\u547d\u5468\u671f\u56de\u8c03\u600e\u6837\u7559\u4e0b\u65e7\u9875\u9762<\/h3>\n<p>\u914d\u7f6e\u53d8\u5316\u4f1a\u9500\u6bc1\u5e76\u91cd\u5efa Activity \u5b9e\u4f8b\u3002\u82e5\u5355\u4f8b\u8bf7\u6c42\u7ba1\u7406\u5668\u4fdd\u5b58\u4e00\u4e2a\u533f\u540d\u5185\u90e8\u56de\u8c03&#xff0c;\u533f\u540d\u5185\u90e8\u7c7b\u9ed8\u8ba4\u53ef\u80fd\u6355\u83b7\u5916\u90e8 Activity&#xff1b;\u53ea\u8981\u8bf7\u6c42\u3001\u7ebf\u7a0b\u3001\u961f\u5217\u6216\u7f13\u5b58\u4ecd\u6301\u6709\u8be5\u56de\u8c03&#xff0c;\u65e7\u5b9e\u4f8b\u5c31\u4ecd\u53ef\u8fbe\u3002<\/p>\n<p>#mermaid-svg-vwmNX8oM8ndyQD9F{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes 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.edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-vwmNX8oM8ndyQD9F .marker{fill:#333333;stroke:#333333;}#mermaid-svg-vwmNX8oM8ndyQD9F .marker.cross{stroke:#333333;}#mermaid-svg-vwmNX8oM8ndyQD9F svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-vwmNX8oM8ndyQD9F p{margin:0;}#mermaid-svg-vwmNX8oM8ndyQD9F .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-vwmNX8oM8ndyQD9F .cluster-label text{fill:#333;}#mermaid-svg-vwmNX8oM8ndyQD9F .cluster-label span{color:#333;}#mermaid-svg-vwmNX8oM8ndyQD9F .cluster-label span p{background-color:transparent;}#mermaid-svg-vwmNX8oM8ndyQD9F .label text,#mermaid-svg-vwmNX8oM8ndyQD9F span{fill:#333;color:#333;}#mermaid-svg-vwmNX8oM8ndyQD9F .node rect,#mermaid-svg-vwmNX8oM8ndyQD9F .node circle,#mermaid-svg-vwmNX8oM8ndyQD9F .node ellipse,#mermaid-svg-vwmNX8oM8ndyQD9F .node polygon,#mermaid-svg-vwmNX8oM8ndyQD9F .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-vwmNX8oM8ndyQD9F .rough-node .label text,#mermaid-svg-vwmNX8oM8ndyQD9F .node .label text,#mermaid-svg-vwmNX8oM8ndyQD9F .image-shape .label,#mermaid-svg-vwmNX8oM8ndyQD9F .icon-shape .label{text-anchor:middle;}#mermaid-svg-vwmNX8oM8ndyQD9F .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-vwmNX8oM8ndyQD9F .rough-node .label,#mermaid-svg-vwmNX8oM8ndyQD9F .node .label,#mermaid-svg-vwmNX8oM8ndyQD9F .image-shape .label,#mermaid-svg-vwmNX8oM8ndyQD9F .icon-shape .label{text-align:center;}#mermaid-svg-vwmNX8oM8ndyQD9F .node.clickable{cursor:pointer;}#mermaid-svg-vwmNX8oM8ndyQD9F .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-vwmNX8oM8ndyQD9F .arrowheadPath{fill:#333333;}#mermaid-svg-vwmNX8oM8ndyQD9F .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-vwmNX8oM8ndyQD9F .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-vwmNX8oM8ndyQD9F .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-vwmNX8oM8ndyQD9F .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-vwmNX8oM8ndyQD9F .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-vwmNX8oM8ndyQD9F .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-vwmNX8oM8ndyQD9F .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-vwmNX8oM8ndyQD9F .cluster text{fill:#333;}#mermaid-svg-vwmNX8oM8ndyQD9F .cluster span{color:#333;}#mermaid-svg-vwmNX8oM8ndyQD9F div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-vwmNX8oM8ndyQD9F .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-vwmNX8oM8ndyQD9F rect.text{fill:none;stroke-width:0;}#mermaid-svg-vwmNX8oM8ndyQD9F .icon-shape,#mermaid-svg-vwmNX8oM8ndyQD9F .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-vwmNX8oM8ndyQD9F .icon-shape p,#mermaid-svg-vwmNX8oM8ndyQD9F .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-vwmNX8oM8ndyQD9F .icon-shape .label rect,#mermaid-svg-vwmNX8oM8ndyQD9F .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-vwmNX8oM8ndyQD9F .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-vwmNX8oM8ndyQD9F .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-vwmNX8oM8ndyQD9F :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u7cfb\u7edf&#xff1a;\u53d1\u751f\u914d\u7f6e\u53d8\u5316<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Activity&#xff1a;\u65e7\u5b9e\u4f8b\u6267\u884c\u9500\u6bc1\u6d41\u7a0b<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Activity&#xff1a;\u521b\u5efa\u65b0\u5b9e\u4f8b<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Singleton&#xff1a;\u8bf7\u6c42\u7ba1\u7406\u5668<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Request&#xff1a;\u5c1a\u672a\u5b8c\u6210<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Callback&#xff1a;\u6355\u83b7\u65e7 Activity<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Activity&#xff1a;\u65cb\u8f6c\u524d\u5b9e\u4f8b<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>View&#xff1a;\u65e7\u89c6\u56fe\u6811<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Bitmap&#xff1a;\u65e7\u56fe\u7247<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Activity&#xff1a;\u65cb\u8f6c\u540e\u5b9e\u4f8b<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>GC Root&#xff1a;\u9759\u6001\u5355\u4f8b\u5b57\u6bb5<\/p>\n<p><\/span><\/p>\n<p>\u8c01\u521b\u5efa&#xff1a;\u7cfb\u7edf\u521b\u5efa\u65b0\u65e7\u9875\u9762&#xff0c;\u5355\u4f8b\u521b\u5efa\u6216\u63a5\u6536\u8bf7\u6c42\u4e0e\u56de\u8c03&#xff1b;\u8c01\u6301\u6709&#xff1a;\u9759\u6001\u5b57\u6bb5\u5230\u5355\u4f8b\u3001\u8bf7\u6c42\u5230\u56de\u8c03\u3001\u56de\u8c03\u5230\u65e7\u9875\u9762&#xff1b;\u4f55\u65f6\u89e6\u53d1&#xff1a;\u65cb\u8f6c\u540e\u672a\u53d6\u6d88\u6216\u672a\u6e05\u7406\u7684\u5f02\u6b65\u5de5\u4f5c\u5b8c\u6210\u524d&#xff1b;\u7ed3\u679c\u4ea4\u7ed9\u8c01&#xff1a;\u56de\u8c03\u539f\u672c\u60f3\u628a\u7ed3\u679c\u4ea4\u7ed9\u9875\u9762&#xff0c;\u5b9e\u9645\u5374\u628a\u65e7\u9875\u9762\u7684\u751f\u547d\u5468\u671f\u5ef6\u957f\u4e86\u3002\u4e0d\u8981\u628a onDestroy() \u5f53\u6210\u552f\u4e00\u4fdd\u9669&#xff1a;\u591a\u7a97\u53e3\u3001\u5bfc\u822a\u3001\u4e34\u65f6\u4e0d\u53ef\u89c1\u548c\u72b6\u6001\u4fdd\u5b58\u90fd\u8981\u6c42\u4f9d\u636e\u5de5\u4f5c\u8bed\u4e49\u9009\u62e9 onStop()\u3001onCleared()\u3001\u534f\u7a0b\/\u8bf7\u6c42\u53d6\u6d88\u6216\u660e\u786e\u7684\u8ba2\u9605\u89e3\u7ed1\u3002<\/p>\n<h3>\u8c01\u8d1f\u8d23\u521b\u5efa\u3001\u6301\u6709\u3001\u89e6\u53d1\u4e0e\u63a5\u6536<\/h3>\n<table>\n<tr>\u534f\u4f5c\u5bf9\u8c61\u8c01\u521b\u5efa\u8c01\u6301\u6709\u6216\u51b3\u5b9a\u751f\u547d\u5468\u671f\u8c01\u89e6\u53d1\u5173\u952e\u52a8\u4f5c\u6570\u636e\u6216\u751f\u547d\u5468\u671f\u4fe1\u606f\u4ea4\u7ed9\u8c01<\/tr>\n<tbody>\n<tr>\n<td>Activity<\/td>\n<td>Android \u6846\u67b6<\/td>\n<td>\u7cfb\u7edf\u4efb\u52a1\u6808\u4e0e\u5f53\u524d\u754c\u9762\u6d41\u7a0b<\/td>\n<td>\u751f\u547d\u5468\u671f\u56de\u8c03\u3001\u914d\u7f6e\u53d8\u5316\u3001\u7528\u6237\u4ea4\u4e92<\/td>\n<td>\u5c06 UI \u4e8b\u4ef6\u4ea4\u7ed9 ViewModel\u3001\u63a7\u5236\u5668\u6216\u8bf7\u6c42\u5c42<\/td>\n<\/tr>\n<tr>\n<td>\u5355\u4f8b\u7ba1\u7406\u5668<\/td>\n<td>Application \u521d\u59cb\u5316\u6216\u9996\u6b21\u8bbf\u95ee\u4ee3\u7801<\/td>\n<td>\u9759\u6001\u5b57\u6bb5\u6216 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\u53ef\u8fbe\u5173\u7cfb\u51b3\u5b9a&#xff0c;\u4e0d\u662f\u4e1a\u52a1\u5bf9\u8c61\u624b\u5de5\u6301\u6709<\/td>\n<td>\u5206\u914d\u538b\u529b\u4e0e\u8fd0\u884c\u65f6\u8c03\u5ea6\u5171\u540c\u89e6\u53d1<\/td>\n<td>\u56de\u6536\u4e0d\u53ef\u8fbe\u5bf9\u8c61\u53ca\u5176\u53ef\u56de\u6536\u5185\u5b58<\/td>\n<\/tr>\n<tr>\n<td>LeakCanary \u98ce\u683c\u89c2\u5bdf\u5668<\/td>\n<td>\u8c03\u8bd5\u5e93\u5728\u9875\u9762\u9500\u6bc1\u540e\u6ce8\u518c\u89c2\u5bdf<\/td>\n<td>\u89c2\u5bdf\u5668\u6301\u6709\u5f31\u5f15\u7528\u548c\u5f15\u7528\u961f\u5217\u7b49\u8bca\u65ad\u72b6\u6001<\/td>\n<td>\u9884\u671f\u5e94\u56de\u6536\u7684\u5bf9\u8c61\u4ecd\u957f\u65f6\u95f4\u53ef\u8fbe\u65f6<\/td>\n<td>\u5411\u5f00\u53d1\u8005\u62a5\u544a\u6700\u77ed\u4fdd\u7559\u8def\u5f84\u4e0e\u7591\u4f3c\u6839<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>LeakCanary \u98ce\u683c\u7684\u673a\u5236\u662f\u201c\u89c2\u5bdf\u672c\u5e94\u6b7b\u4ea1\u7684\u5bf9\u8c61\u662f\u5426\u4ecd\u88ab\u4fdd\u7559\u201d&#xff0c;\u4e0d\u662f\u66ff\u4ee3\u5185\u5b58\u6a21\u578b\u3002Android Studio Memory Profiler \u66f4\u9002\u5408\u770b\u5206\u914d\u3001\u5bf9\u8c61\u6570\u91cf\u3001\u5806\u8f6c\u50a8\u4e0e\u5f15\u7528\u94fe&#xff1b;\u4e24\u8005\u90fd\u9700\u8981\u7ed3\u5408\u64cd\u4f5c\u8def\u5f84\u3001\u8bbe\u5907\u5185\u5b58\u6863\u4f4d\u548c\u771f\u5b9e\u56fe\u7247\u5c3a\u5bf8\u5224\u65ad\u3002\u8bca\u65ad\u5de5\u5177\u7ed9\u51fa\u7684\u662f\u7ebf\u7d22&#xff0c;\u6240\u6709\u6743\u6a21\u578b\u624d\u662f\u4fee\u590d\u3002<\/p>\n<h3>\u5206\u914d\u538b\u529b\u3001Bitmap \u4e0e OOM \u8bca\u65ad\u94fe\u8def<\/h3>\n<p>\u5927\u56fe\u662f\u6700\u5178\u578b\u7684\u5206\u914d\u538b\u529b\u6765\u6e90\u4e4b\u4e00\u3002\u4ee5 ARGB_8888 \u7c97\u7565\u4f30\u7b97&#xff0c;width * height * 4 \u5b57\u8282\u7684\u50cf\u7d20\u5c31\u8db3\u4ee5\u8ba9\u5168\u5c3a\u5bf8\u76f8\u673a\u56fe\u8fc5\u901f\u5360\u6ee1\u9884\u7b97&#xff1b;\u5b9e\u9645\u5360\u7528\u8fd8\u53d7\u91c7\u6837\u3001\u8272\u5f69\u7a7a\u95f4\u3001\u786c\u4ef6\u4f4d\u56fe\u3001\u89e3\u7801\u5668\u3001\u7f29\u653e\u526f\u672c\u548c\u5b9e\u73b0\u7248\u672c\u5f71\u54cd\u3002\u65e7 Android \u7248\u672c\u4e0e\u73b0\u4ee3\u7248\u672c\u5bf9\u50cf\u7d20\u5b58\u50a8\u4f4d\u7f6e\u548c Bitmap \u5b9e\u73b0\u7ec6\u8282\u4e0d\u540c&#xff1a;Java \u5305\u88c5\u5bf9\u8c61\u4f1a\u53c2\u4e0e ART \u5806\u7684\u53ef\u8fbe\u6027\u5206\u6790&#xff0c;\u50cf\u7d20\u6216\u56fe\u5f62\u8d44\u6e90\u7684\u5b9e\u9645\u5206\u914d\u4e5f\u53ef\u80fd\u6d89\u53ca\u8fd0\u884c\u65f6\u3001native \u6216\u56fe\u5f62\u5b9e\u73b0\u3002\u56e0\u6b64\u4e0d\u8981\u7528\u201c\u50cf\u7d20\u4e00\u5b9a\u53ea\u5728 native\u201d\u6216\u201c\u4e00\u5b9a\u53ea\u5728 Java heap\u201d\u6982\u62ec\u6240\u6709\u8bbe\u5907\u3002<\/p>\n<p>#mermaid-svg-X5g9zcvF5RSqGJgK{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-X5g9zcvF5RSqGJgK .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-X5g9zcvF5RSqGJgK .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-X5g9zcvF5RSqGJgK .error-icon{fill:#552222;}#mermaid-svg-X5g9zcvF5RSqGJgK .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-X5g9zcvF5RSqGJgK .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-X5g9zcvF5RSqGJgK .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-X5g9zcvF5RSqGJgK .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-X5g9zcvF5RSqGJgK 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circle,#mermaid-svg-X5g9zcvF5RSqGJgK .node ellipse,#mermaid-svg-X5g9zcvF5RSqGJgK .node polygon,#mermaid-svg-X5g9zcvF5RSqGJgK .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-X5g9zcvF5RSqGJgK .rough-node .label text,#mermaid-svg-X5g9zcvF5RSqGJgK .node .label text,#mermaid-svg-X5g9zcvF5RSqGJgK .image-shape .label,#mermaid-svg-X5g9zcvF5RSqGJgK .icon-shape .label{text-anchor:middle;}#mermaid-svg-X5g9zcvF5RSqGJgK .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-X5g9zcvF5RSqGJgK .rough-node .label,#mermaid-svg-X5g9zcvF5RSqGJgK .node .label,#mermaid-svg-X5g9zcvF5RSqGJgK .image-shape .label,#mermaid-svg-X5g9zcvF5RSqGJgK .icon-shape .label{text-align:center;}#mermaid-svg-X5g9zcvF5RSqGJgK .node.clickable{cursor:pointer;}#mermaid-svg-X5g9zcvF5RSqGJgK .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-X5g9zcvF5RSqGJgK .arrowheadPath{fill:#333333;}#mermaid-svg-X5g9zcvF5RSqGJgK .edgePath 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ms\\&#8221;,verdana,arial,sans-serif;}<span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/p>\n<p>\u5426<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/p>\n<p>\u662f<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/p>\n<p>\u662f<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/p>\n<p>\u5426<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/p>\n<p>\u4ecd\u4e0d\u8db3<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u7528\u6237\u64cd\u4f5c&#xff1a;\u6eda\u52a8\u56fe\u7247\u5217\u8868<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u56fe\u7247\u89e3\u7801&#xff1a;\u521b\u5efa Bitmap<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u8fd0\u884c\u65f6\u4e0e\u56fe\u5f62\u5206\u914d&#xff1a;\u5bf9\u8c61\u4e0e\u50cf\u7d20<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u5206\u914d\u538b\u529b\u662f\u5426\u5347\u9ad8<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>UI&#xff1a;\u663e\u793a\u56fe\u7247<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>ART GC&#xff1a;\u5c1d\u8bd5\u56de\u6536\u4e0d\u53ef\u8fbe\u5bf9\u8c61<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u53ef\u7528\u7a7a\u95f4\u662f\u5426\u8db3\u591f<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>Profiler&#xff1a;\u6293\u53d6\u5206\u914d\u4e0e\u5806\u8f6c\u50a8<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>GC Root \u8def\u5f84&#xff1a;\u786e\u8ba4\u4fdd\u7559\u94fe<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u4fee\u590d&#xff1a;\u89e3\u7ed1\u3001\u53d6\u6d88\u3001\u9650\u7f13\u5b58\u3001\u91c7\u6837<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u91cd\u65b0\u6d4b\u91cf&#xff1a;\u540c\u4e00\u64cd\u4f5c\u8def\u5f84<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>OOM&#xff1a;\u672c\u6b21\u5206\u914d\u5931\u8d25<\/p>\n<p><\/span><\/p>\n<p>\u8fd9\u91cc System.gc() \u4e0d\u662f\u4fee\u590d\u624b\u6bb5\u3002\u5b83\u6700\u591a\u662f\u63d0\u793a\u8fd0\u884c\u65f6\u5c1d\u8bd5\u4e00\u6b21\u56de\u6536&#xff0c;\u4e0d\u80fd\u56de\u6536\u4ecd\u88ab\u5f15\u7528\u7684\u5bf9\u8c61&#xff0c;\u4e0d\u80fd\u4fdd\u8bc1\u65f6\u95f4\u70b9&#xff0c;\u8fd8\u53ef\u80fd\u6270\u4e71\u6027\u80fd\u6d4b\u8bd5\u3002\u4f18\u5148\u51cf\u5c11\u4e00\u6b21\u5206\u914d\u3001\u6309\u663e\u793a\u5c3a\u5bf8\u91c7\u6837\u3001\u8bbe\u7f6e\u7f13\u5b58\u4e0a\u9650&#xff0c;\u5e76\u9a8c\u8bc1\u53d6\u6d88\u540e\u65e7\u9875\u9762\u4e0d\u518d\u63a5\u6536\u7ed3\u679c\u3002<\/p>\n<h3>Java-first \u7b80\u5316\u793a\u4f8b&#xff1a;\u4ece\u9519\u8bef\u6355\u83b7\u5230\u663e\u5f0f\u89e3\u7ed1<\/h3>\n<p>\u4e0b\u9762\u7b2c\u4e00\u6bb5\u5c55\u793a\u6cc4\u6f0f\u98ce\u9669&#xff1a;\u9759\u6001\u6267\u884c\u5668\u6301\u6709\u4efb\u52a1&#xff0c;\u4efb\u52a1\u6301\u6709\u533f\u540d\u56de\u8c03&#xff0c;\u56de\u8c03\u9690\u5f0f\u6355\u83b7 Activity\u3002\u7b2c\u4e8c\u6bb5\u628a\u56de\u8c03\u53d8\u6210\u53ef\u89e3\u7ed1\u7684\u76d1\u542c\u5668&#xff0c;\u5e76\u5728\u9875\u9762\u505c\u6b62\u65f6\u53d6\u6d88\u4efb\u52a1\u3002\u5b83\u662f\u6559\u5b66\u6027\u7b80\u5316&#xff0c;\u4e0d\u662f\u56fe\u7247\u52a0\u8f7d\u6846\u67b6\u3002<\/p>\n<p><span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ImageJobs<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ExecutorService<\/span> <span class=\"token constant\">EXECUTOR<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Executors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newSingleThreadExecutor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">loadLeaky<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Activity<\/span> activity<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> url<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token constant\">EXECUTOR<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">execute<\/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\">{<\/span><br \/>\n            <span class=\"token class-name\">Bitmap<\/span> bitmap <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">decode<\/span><span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            activity<span class=\"token punctuation\">.<\/span><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> activity<span class=\"token punctuation\">.<\/span><span class=\"token function\">showBitmap<\/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 punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>activity \u88ab\u5de5\u4f5c\u4efb\u52a1\u548c UI lambda \u6355\u83b7&#xff1b;\u82e5\u89e3\u7801\u6162\u3001\u961f\u5217\u62e5\u585e\u6216\u8bf7\u6c42\u65e0\u6cd5\u53d6\u6d88&#xff0c;\u65cb\u8f6c\u540e\u7684\u65e7\u9875\u9762\u4f1a\u88ab\u5355\u4f8b\u5f0f\u6267\u884c\u5668\u8def\u5f84\u7ee7\u7eed\u4fdd\u6d3b\u3002<\/p>\n<p><span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ImageRequest<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ExecutorService<\/span> executor<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> mainHandler <span class=\"token operator\">&#061;<\/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><br \/>\n    <span class=\"token comment\">\/\/ start\u3001stop \u4e0e deliverSuccess \u53ea\u5728\u4e3b\u7ebf\u7a0b\u8c03\u7528\u3002<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">RequestToken<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Listener<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> listeners <span class=\"token operator\">&#061;<\/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 keyword\">private<\/span> <span class=\"token class-name\">RequestToken<\/span> active<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Future<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> running<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">long<\/span> nextRequestId<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Listener<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">void<\/span> <span class=\"token function\">onBitmap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Bitmap<\/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 class-name\">ImageRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ExecutorService<\/span> executor<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>executor <span class=\"token operator\">&#061;<\/span> executor<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> url<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Listener<\/span> listener<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">requireMainThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">stop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">RequestToken<\/span> token <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RequestToken<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#043;&#043;<\/span>nextRequestId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        active <span class=\"token operator\">&#061;<\/span> token<span class=\"token punctuation\">;<\/span><br \/>\n        listeners<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>token<span class=\"token punctuation\">,<\/span> listener<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">Handler<\/span> handler <span class=\"token operator\">&#061;<\/span> mainHandler<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">WeakReference<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">ImageRequest<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> owner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">WeakReference<\/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 keyword\">this<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        running <span class=\"token operator\">&#061;<\/span> executor<span class=\"token punctuation\">.<\/span><span class=\"token function\">submit<\/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\">{<\/span><br \/>\n            <span class=\"token class-name\">Bitmap<\/span> bitmap <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">decode<\/span><span class=\"token punctuation\">(<\/span>url<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 class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">isInterrupted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> token<span class=\"token punctuation\">.<\/span>cancelled<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            handler<span class=\"token punctuation\">.<\/span><span class=\"token function\">postAtTime<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Delivery<\/span><span class=\"token punctuation\">(<\/span>owner<span class=\"token punctuation\">,<\/span> token<span class=\"token punctuation\">,<\/span> bitmap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> token<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">SystemClock<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">uptimeMillis<\/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><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">stop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">requireMainThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">RequestToken<\/span> token <span class=\"token operator\">&#061;<\/span> active<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Future<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> task <span class=\"token operator\">&#061;<\/span> running<span class=\"token punctuation\">;<\/span><br \/>\n        active <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5148\u5931\u6548&#xff0c;\u5df2\u5165\u961f\u7684\u4ea4\u4ed8\u4f1a\u5728\u4e3b\u7ebf\u7a0b\u95f8\u95e8\u5931\u8d25\u3002<\/span><br \/>\n        running <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>token <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            token<span class=\"token punctuation\">.<\/span>cancelled <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            listeners<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>token<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            mainHandler<span class=\"token punctuation\">.<\/span><span class=\"token function\">removeCallbacksAndMessages<\/span><span class=\"token punctuation\">(<\/span>token<span class=\"token punctuation\">)<\/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>task <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> task<span class=\"token punctuation\">.<\/span><span class=\"token function\">cancel<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/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\">deliverSuccess<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">RequestToken<\/span> token<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Bitmap<\/span> bitmap<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">requireMainThread<\/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>active <span class=\"token operator\">!&#061;<\/span> token <span class=\"token operator\">||<\/span> token<span class=\"token punctuation\">.<\/span>cancelled<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Listener<\/span> listener <span class=\"token operator\">&#061;<\/span> listeners<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>token<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        active <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        running <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>listener <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> listener<span class=\"token punctuation\">.<\/span><span class=\"token function\">onBitmap<\/span><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\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">RequestToken<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">long<\/span> id<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">boolean<\/span> cancelled<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">RequestToken<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span> id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>id <span class=\"token operator\">&#061;<\/span> id<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\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Delivery<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Runnable<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">WeakReference<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">ImageRequest<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> owner<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">RequestToken<\/span> token<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Bitmap<\/span> bitmap<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">Delivery<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">WeakReference<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">ImageRequest<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> owner<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">RequestToken<\/span> token<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Bitmap<\/span> bitmap<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>owner <span class=\"token operator\">&#061;<\/span> owner<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>token <span class=\"token operator\">&#061;<\/span> token<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>bitmap <span class=\"token operator\">&#061;<\/span> bitmap<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token annotation punctuation\">&#064;Override<\/span> <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\">{<\/span><br \/>\n            <span class=\"token class-name\">ImageRequest<\/span> request <span class=\"token operator\">&#061;<\/span> owner<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/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>request <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">deliverSuccess<\/span><span class=\"token punctuation\">(<\/span>token<span class=\"token punctuation\">,<\/span> bitmap<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>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">requireMainThread<\/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 class-name\">Looper<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">myLooper<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/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><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Call from the main thread only&#034;<\/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><span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PhotoActivity<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Activity<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ImageRequest<\/span> request<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span> <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\">{<\/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        request <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ImageRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ImageJobs<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">EXECUTOR<\/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\">&#064;Override<\/span> <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">onStart<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">onStart<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        request<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;photo&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">showBitmap<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ deliverSuccess \u5df2\u5728\u4e3b\u7ebf\u7a0b\u8fd0\u884c\u3002<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span> <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">onStop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        request<span class=\"token punctuation\">.<\/span><span class=\"token function\">stop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">onStop<\/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>\u7b80\u5316\u8bf4\u660e&#xff1a; \u8fd9\u6bb5\u4f2a\u4ee3\u7801\u7528\u201c\u4e3b\u7ebf\u7a0b\u4ee4\u724c\u95f8\u95e8\u201d\u8868\u8fbe\u5173\u952e\u8fb9\u754c&#xff1a;stop() \u5148\u4ee4\u65e7 token \u5931\u6548\u3001\u6e05\u9664 listener \u5e76\u79fb\u9664\u5df2\u5165\u961f\u7684 token \u56de\u8c03&#xff1b;\u5373\u4f7f\u4e0d\u54cd\u5e94\u4e2d\u65ad\u7684\u89e3\u7801\u5728\u6b64\u540e\u6295\u9012&#xff0c;deliverSuccess \u4e5f\u4f1a\u5728\u4e3b\u7ebf\u7a0b\u62d2\u7edd\u65e7 token\u3002\u5de5\u4f5c\u7ebf\u7a0b\u4e0e\u5df2\u5165\u961f Delivery \u53ea\u5f31\u5f15\u7528 ImageRequest&#xff0c;\u4e0d\u5f3a\u6301\u6709\u9875\u9762&#xff1b;\u771f\u6b63\u7684\u6240\u6709\u6743\u4fee\u590d\u662f\u4e3b\u7ebf\u7a0b\u7684\u663e\u5f0f\u53d6\u6d88\u548c\u89e3\u7ed1&#xff0c;\u5f31\u5f15\u7528\u4e0d\u662f\u901a\u7528\u6cc4\u6f0f\u4fee\u590d\u3002<\/p>\n<p>\u5b83\u6545\u610f\u7701\u7565 native allocations\u3001OEM GC scheduling\u3001\u5b8c\u6574 heap-dump \u89e3\u6790\u3001image decode configuration\u3001\u771f\u5b9e\u56fe\u7247\u5e93\u7684\u8bf7\u6c42\u5408\u5e76\u3001\u4e3b\u7ebf\u7a0b\u4e32\u884c\u72b6\u6001\u673a\u7684\u5b8c\u6574\u9519\u8bef\u5206\u652f\u3001\u7f13\u5b58\u9010\u51fa\u3001\u9519\u8bef\u4f20\u64ad\u548c\u7ade\u4e89\u6761\u4ef6\u7684\u5168\u90e8\u5904\u7406\u3002cancel(true) \u53ea\u8bf7\u6c42\u4e2d\u65ad&#xff0c;\u4e0d\u80fd\u4fdd\u8bc1\u4e0d\u5408\u4f5c\u7684\u89e3\u7801\u7acb\u5373\u505c\u6b62&#xff1b;\u771f\u5b9e\u9879\u76ee\u4f18\u5148\u4f7f\u7528\u5177\u5907\u751f\u547d\u5468\u671f\u6574\u5408\u3001\u8bf7\u6c42\u53d6\u6d88\u3001\u5c3a\u5bf8\u91c7\u6837\u4e0e\u7f13\u5b58\u7b56\u7565\u7684\u6210\u719f\u56fe\u7247\u5e93&#xff0c;\u5e76\u8ba9 ViewModel\/\u754c\u9762\u5c42\u660e\u786e\u8c01\u8ba2\u9605\u3001\u8c01\u53d6\u6d88\u3001\u8c01\u663e\u793a\u3002<\/p>\n<h3>\u5e38\u89c1\u8bef\u5224\u4e0e\u4fee\u590d\u65b9\u5411<\/h3>\n<ul>\n<li>\u9759\u6001\u5b57\u6bb5\u3001\u5355\u4f8b\u6216 Application \u5bf9\u8c61\u4e0d\u80fd\u4fdd\u5b58 Activity\u3001View \u6216\u9875\u9762\u56de\u8c03&#xff1b;\u9700\u8981 Context \u65f6\u4f18\u5148\u786e\u8ba4\u662f\u5426\u53ea\u9700 applicationContext\u3002<\/li>\n<li>\u533f\u540d\u5185\u90e8\u7c7b\u3001lambda \u4e0e\u5ef6\u8fdf\u4efb\u52a1\u53ef\u80fd\u6355\u83b7\u5916\u90e8\u5bf9\u8c61&#xff1b;\u67e5\u770b\u5b9e\u9645\u95ed\u5305\u548c\u961f\u5217\u6240\u6709\u8005&#xff0c;\u4e0d\u53ea\u770b\u4ee3\u7801\u8868\u9762\u3002<\/li>\n<li>\u53ea\u4f9d\u8d56 onDestroy() \u5f80\u5f80\u592a\u665a\u6216\u8986\u76d6\u4e0d\u8db3&#xff1b;\u6309\u5de5\u4f5c\u662f\u5426\u5e94\u5728\u4e0d\u53ef\u89c1\u65f6\u505c\u6b62\u6765\u9009\u62e9\u6e05\u7406\u8fb9\u754c&#xff0c;\u5e76\u4fdd\u8bc1\u53ef\u91cd\u590d\u8c03\u7528\u3002<\/li>\n<li>\u4e0d\u8981\u628a\u5f31\u5f15\u7528\u6279\u91cf\u8d34\u5230\u6240\u6709\u76d1\u542c\u5668\u4e0a\u3002\u5b83\u4f1a\u8ba9\u56de\u8c03\u6d88\u5931\u3001\u72b6\u6001\u66f4\u96be\u63a8\u7406&#xff0c;\u5374\u6ca1\u6709\u5904\u7406\u8bf7\u6c42\u53d6\u6d88\u3001\u7f13\u5b58\u6216\u5927\u5bf9\u8c61\u4fdd\u7559\u3002<\/li>\n<li>\u4e0d\u8981\u628a System.gc() \u653e\u8fdb\u6eda\u52a8\u3001\u56fe\u7247\u52a0\u8f7d\u6216\u201c\u5185\u5b58\u4fee\u590d\u201d\u903b\u8f91&#xff1b;\u6d4b\u91cf\u3001\u9650\u989d\u548c\u6240\u6709\u6743\u4fee\u590d\u624d\u53ef\u9a8c\u8bc1\u3002<\/li>\n<li>\u4e0d\u8981\u957f\u65f6\u95f4\u4fdd\u7559\u539f\u59cb\u5927 Bitmap&#xff1b;\u6309\u663e\u793a\u5bb9\u5668\u91c7\u6837\u3001\u907f\u514d\u65e0\u610f\u4e49\u526f\u672c\u3001\u9650\u5236\u7f13\u5b58\u5e76\u5728\u538b\u529b\u8bbe\u5907\u4e0a\u590d\u6d4b\u3002<\/li>\n<li>\u5806\u6301\u7eed\u589e\u957f\u4e0d\u7b49\u4e8e\u5df2\u786e\u8ba4\u6cc4\u6f0f\u3002\u5bf9\u6bd4\u91cd\u590d\u64cd\u4f5c\u540e\u7684\u7a33\u5b9a\u8d8b\u52bf\u3001\u5bf9\u8c61\u8ba1\u6570\u3001\u5f3a\u5236\u8f6c\u50a8\u4e2d\u7684\u6700\u77ed GC Root \u8def\u5f84\u548c\u7f13\u5b58\u9884\u671f&#xff0c;\u624d\u4e0b\u7ed3\u8bba\u3002<\/li>\n<\/ul>\n<h3>\u53ef\u52a8\u624b\u6539\u9020\u7684\u7ec3\u4e60&#xff1a;\u8ba9\u65e7 Activity \u7559\u4e0b\u6765&#xff0c;\u518d\u653e\u5b83\u8d70<\/h3>\n<li>\u5728\u8c03\u8bd5\u793a\u4f8b\u4e2d\u8ba9\u4e00\u4e2a\u9759\u6001\u8bf7\u6c42\u7ba1\u7406\u5668\u4fdd\u5b58 Listener&#xff0c;\u4f7f Listener \u4ee5\u533f\u540d\u5185\u90e8\u7c7b\u5f15\u7528\u5f53\u524d Activity&#xff1b;\u9875\u9762\u6253\u5f00\u56fe\u7247\u8bf7\u6c42\u540e\u7acb\u523b\u65cb\u8f6c\u3002<\/li>\n<li>\u7528 Android Studio Memory Profiler \u8bb0\u5f55\u5206\u914d\u5e76\u6293\u53d6 heap dump&#xff0c;\u641c\u7d22\u65e7 Activity \u5b9e\u4f8b&#xff0c;\u67e5\u770b\u5b83\u5230\u4e00\u4e2a GC Root \u7684 shortest path&#xff1b;\u8bb0\u5f55\u662f\u9759\u6001\u5b57\u6bb5\u3001\u7ebf\u7a0b\u3001\u961f\u5217\u8fd8\u662f\u7f13\u5b58\u6301\u6709\u3002<\/li>\n<li>\u6539\u4e3a\u8bf7\u6c42\u5bf9\u8c61\u53ea\u4fdd\u5b58\u53ef\u53d6\u6d88\u7684\u8ba2\u9605&#xff0c;\u5e76\u5728 onStop() \u6216\u5bf9\u5e94\u7684 ViewModel \u6e05\u7406\u8fb9\u754c\u8c03\u7528 stop()&#xff1b;\u4e0d\u8981\u9760\u5f31\u5f15\u7528\u8499\u6df7\u8fc7\u5173\u3002<\/li>\n<li>\u91cd\u590d\u76f8\u540c\u65cb\u8f6c\u8def\u5f84&#xff0c;\u786e\u8ba4\u65e7\u5b9e\u4f8b\u4e0d\u518d\u51fa\u73b0\u5728\u610f\u5916\u4fdd\u7559\u94fe\u4e2d&#xff0c;\u540c\u65f6\u786e\u8ba4\u65b0\u9875\u9762\u4ecd\u80fd\u663e\u793a\u6709\u6548\u7ed3\u679c\u3002\u518d\u628a\u56fe\u7247\u6539\u4e3a\u63a5\u8fd1\u663e\u793a\u5c3a\u5bf8\u7684\u91c7\u6837\u7248\u672c&#xff0c;\u6bd4\u8f83\u5206\u914d\u6b21\u6570\u548c\u5cf0\u503c\u3002<\/li>\n<h3>\u51b3\u7b56\u6e05\u5355<\/h3>\n<ul>\n<li>\u8fd9\u6761\u5f15\u7528\u7684\u62e5\u6709\u8005\u6bd4 Activity \u6d3b\u5f97\u66f4\u4e45\u5417&#xff1f;\u82e5\u662f&#xff0c;\u4e3a\u4ec0\u4e48\u5b83\u9700\u8981\u9875\u9762\u5bf9\u8c61\u800c\u4e0d\u662f\u6570\u636e\u3001ID\u3001applicationContext 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