{"id":68,"date":"2017-04-15T13:31:20","date_gmt":"2017-04-15T05:31:20","guid":{"rendered":"http:\/\/av16874667.imwork.net:13582\/?p=68"},"modified":"2017-04-15T13:31:20","modified_gmt":"2017-04-15T05:31:20","slug":"android-%e8%bf%9b%e7%a8%8b%e7%9a%84%e4%bc%98%e5%85%88%e7%ba%a7%e5%88%ab","status":"publish","type":"post","link":"https:\/\/www.dd-home.top\/?p=68","title":{"rendered":"android \u8fdb\u7a0b\u7684\u4f18\u5148\u7ea7\u522b"},"content":{"rendered":"<p><!--more--><\/p>\n<p><strong>\u7a7a\u8fdb\u7a0b&lt;\u540e\u53f0\u8fdb\u7a0b&lt;\u670d\u52a1\u8fdb\u7a0b&lt;\u53ef\u89c1\u8fdb\u7a0b&lt;\u524d\u53f0\u8fdb\u7a0b<\/strong><\/p>\n<p><a href=\"https:\/\/developer.android.com\/guide\/components\/processes-and-threads.html#Processes\">https:\/\/developer.android.com\/guide\/components\/processes-and-threads.html#Processes<\/a><\/p>\n<h1>\u8fdb\u7a0b\u548c\u7ebf\u7a0b<\/h1>\n<h2>\u672c\u6587\u5185\u5bb9<\/h2>\n<ol class=\" list-paddingleft-2\">\n<li><a href=\"https:\/\/developer.android.com\/guide\/components\/processes-and-threads.html#Processes\">\u8fdb\u7a0b<\/a>\n<ol class=\"custom_num list-paddingleft-1\">\n<li class=\"list-num-1-1 list-num-paddingleft-1\"><a href=\"https:\/\/developer.android.com\/guide\/components\/processes-and-threads.html#Lifecycle\">\u8fdb\u7a0b\u751f\u547d\u5468\u671f<\/a><\/li>\n<\/ol>\n<\/li>\n<li><a href=\"https:\/\/developer.android.com\/guide\/components\/processes-and-threads.html#Threads\">\u7ebf\u7a0b<\/a>\n<ol class=\"custom_num list-paddingleft-1\">\n<li class=\"list-num-1-1 list-num-paddingleft-1\"><a href=\"https:\/\/developer.android.com\/guide\/components\/processes-and-threads.html#WorkerThreads\">\u5de5\u4f5c\u7ebf\u7a0b<\/a><\/li>\n<li class=\"list-num-1-2 list-num-paddingleft-1\"><a href=\"https:\/\/developer.android.com\/guide\/components\/processes-and-threads.html#ThreadSafe\">\u7ebf\u7a0b\u5b89\u5168\u65b9\u6cd5<\/a><\/li>\n<\/ol>\n<\/li>\n<li><a href=\"https:\/\/developer.android.com\/guide\/components\/processes-and-threads.html#IPC\">\u8fdb\u7a0b\u95f4\u901a\u4fe1<\/a><\/li>\n<\/ol>\n<p>\u5f53\u67d0\u4e2a\u5e94\u7528\u7ec4\u4ef6\u542f\u52a8\u4e14\u8be5\u5e94\u7528\u6ca1\u6709\u8fd0\u884c\u5176\u4ed6\u4efb\u4f55\u7ec4\u4ef6\u65f6\uff0cAndroid \u7cfb\u7edf\u4f1a\u4f7f\u7528\u5355\u4e2a\u6267\u884c\u7ebf\u7a0b\u4e3a\u5e94\u7528\u542f\u52a8\u65b0\u7684 Linux \u8fdb\u7a0b\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u540c\u4e00\u5e94\u7528\u7684\u6240\u6709\u7ec4\u4ef6\u5728\u76f8\u540c\u7684\u8fdb\u7a0b\u548c\u7ebf\u7a0b\uff08\u79f0\u4e3a\u201c\u4e3b\u201d\u7ebf\u7a0b\uff09\u4e2d\u8fd0\u884c\u3002 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\/>\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u540c\u4e00\u5e94\u7528\u7684\u6240\u6709\u7ec4\u4ef6\u5747\u5728\u76f8\u540c\u7684\u8fdb\u7a0b\u4e2d\u8fd0\u884c\uff0c\u4e14\u5927\u591a\u6570\u5e94\u7528\u90fd\u4e0d\u4f1a\u6539\u53d8\u8fd9\u4e00\u70b9\u3002 \u4f46\u662f\uff0c\u5982\u679c\u60a8\u53d1\u73b0\u9700\u8981\u63a7\u5236\u67d0\u4e2a\u7ec4\u4ef6\u6240\u5c5e\u7684\u8fdb\u7a0b\uff0c\u5219\u53ef\u5728\u6e05\u5355\u6587\u4ef6\u4e2d\u6267\u884c\u6b64\u64cd\u4f5c\u3002<\/p>\n<p>\u5404\u7c7b\u7ec4\u4ef6\u5143\u7d20\u7684\u6e05\u5355\u6587\u4ef6\u6761\u76ee\u2014<a href=\"https:\/\/developer.android.com\/guide\/topics\/manifest\/activity-element.html\"><code>&amp;lt;activity&amp;gt;<\/code><\/a>\u3001<a href=\"https:\/\/developer.android.com\/guide\/topics\/manifest\/service-element.html\"><code>&amp;lt;service&amp;gt;<\/code><\/a>\u3001<a href=\"https:\/\/developer.android.com\/guide\/topics\/manifest\/receiver-element.html\"><code>&amp;lt;receiver&amp;gt;<\/code><\/a>\u00a0\u548c\u00a0<a href=\"https:\/\/developer.android.com\/guide\/topics\/manifest\/provider-element.html\"><code>&amp;lt;provider&amp;gt;<\/code><\/a>\u2014\u5747\u652f\u6301\u00a0<code>android:process<\/code>\u00a0\u5c5e\u6027\uff0c\u6b64\u5c5e\u6027\u53ef\u4ee5\u6307\u5b9a\u8be5\u7ec4\u4ef6\u5e94\u5728\u54ea\u4e2a\u8fdb\u7a0b\u8fd0\u884c\u3002\u60a8\u53ef\u4ee5\u8bbe\u7f6e\u6b64\u5c5e\u6027\uff0c\u4f7f\u6bcf\u4e2a\u7ec4\u4ef6\u5747\u5728\u5404\u81ea\u7684\u8fdb\u7a0b\u4e2d\u8fd0\u884c\uff0c\u6216\u8005\u4f7f\u4e00\u4e9b\u7ec4\u4ef6\u5171\u4eab\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u800c\u5176\u4ed6\u7ec4\u4ef6\u5219\u4e0d\u5171\u4eab\u3002 \u6b64\u5916\uff0c\u60a8\u8fd8\u53ef\u4ee5\u8bbe\u7f6e\u00a0<code>android:process<\/code>\uff0c\u4f7f\u4e0d\u540c\u5e94\u7528\u7684\u7ec4\u4ef6\u5728\u76f8\u540c\u7684\u8fdb\u7a0b\u4e2d\u8fd0\u884c\uff0c\u4f46\u524d\u63d0\u662f\u8fd9\u4e9b\u5e94\u7528\u5171\u4eab\u76f8\u540c\u7684 Linux \u7528\u6237 ID \u5e76\u4f7f\u7528\u76f8\u540c\u7684\u8bc1\u4e66\u8fdb\u884c\u7b7e\u7f72\u3002<\/p>\n<p>\u6b64\u5916\uff0c<a href=\"https:\/\/developer.android.com\/guide\/topics\/manifest\/application-element.html\"><code>&amp;lt;application&amp;gt;<\/code><\/a>\u00a0\u5143\u7d20\u8fd8\u652f\u6301\u00a0<code>android:process<\/code>\u00a0\u5c5e\u6027\uff0c\u4ee5\u8bbe\u7f6e\u9002\u7528\u4e8e\u6240\u6709\u7ec4\u4ef6\u7684\u9ed8\u8ba4\u503c\u3002<\/p>\n<p>\u5982\u679c\u5185\u5b58\u4e0d\u8db3\uff0c\u800c\u5176\u4ed6\u4e3a\u7528\u6237\u63d0\u4f9b\u66f4\u7d27\u6025\u670d\u52a1\u7684\u8fdb\u7a0b\u53c8\u9700\u8981\u5185\u5b58\u65f6\uff0cAndroid \u53ef\u80fd\u4f1a\u51b3\u5b9a\u5728\u67d0\u4e00\u65f6\u523b\u5173\u95ed\u67d0\u4e00\u8fdb\u7a0b\u3002\u5728\u88ab\u7ec8\u6b62\u8fdb\u7a0b\u4e2d\u8fd0\u884c\u7684\u5e94\u7528\u7ec4\u4ef6\u4e5f\u4f1a\u968f\u4e4b\u9500\u6bc1\u3002 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Activity<\/li>\n<li>\u6258\u7ba1\u6b63\u5728\u201c\u524d\u53f0\u201d\u8fd0\u884c\u7684\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Service.html\">Service<\/a><\/code>\uff08\u670d\u52a1\u5df2\u8c03\u7528\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Service.html#startForeground(int, android.app.Notification)\">startForeground()<\/a><\/code>\uff09<\/li>\n<li>\u6258\u7ba1\u6b63\u6267\u884c\u4e00\u4e2a\u751f\u547d\u5468\u671f\u56de\u8c03\u7684\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Service.html\">Service<\/a><\/code>\uff08<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Service.html#onCreate()\">onCreate()<\/a><\/code>\u3001<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Service.html#onStart(android.content.Intent, int)\">onStart()<\/a><\/code>\u00a0\u6216\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Service.html#onDestroy()\">onDestroy()<\/a><\/code>\uff09<\/li>\n<li>\u6258\u7ba1\u6b63\u6267\u884c\u5176\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/content\/BroadcastReceiver.html#onReceive(android.content.Context, android.content.Intent)\">onReceive()<\/a><\/code>\u00a0\u65b9\u6cd5\u7684\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/content\/BroadcastReceiver.html\">BroadcastReceiver<\/a><\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u53ef\u89c1\u8fdb\u7a0b<\/strong>\u6ca1\u6709\u4efb\u4f55\u524d\u53f0\u7ec4\u4ef6\u3001\u4f46\u4ecd\u4f1a\u5f71\u54cd\u7528\u6237\u5728\u5c4f\u5e55\u4e0a\u6240\u89c1\u5185\u5bb9\u7684\u8fdb\u7a0b\u3002 \u5982\u679c\u4e00\u4e2a\u8fdb\u7a0b\u6ee1\u8db3\u4ee5\u4e0b\u4efb\u4e00\u6761\u4ef6\uff0c\u5373\u89c6\u4e3a\u53ef\u89c1\u8fdb\u7a0b\uff1a\n<p>\u53ef\u89c1\u8fdb\u7a0b\u88ab\u89c6\u4e3a\u662f\u6781\u5176\u91cd\u8981\u7684\u8fdb\u7a0b\uff0c\u9664\u975e\u4e3a\u4e86\u7ef4\u6301\u6240\u6709\u524d\u53f0\u8fdb\u7a0b\u540c\u65f6\u8fd0\u884c\u800c\u5fc5\u987b\u7ec8\u6b62\uff0c\u5426\u5219\u7cfb\u7edf\u4e0d\u4f1a\u7ec8\u6b62\u8fd9\u4e9b\u8fdb\u7a0b\u3002<\/p>\n<ul class=\" list-paddingleft-2\">\n<li>\u6258\u7ba1\u4e0d\u5728\u524d\u53f0\u3001\u4f46\u4ecd\u5bf9\u7528\u6237\u53ef\u89c1\u7684\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Activity.html\">Activity<\/a><\/code>\uff08\u5df2\u8c03\u7528\u5176\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Activity.html#onPause()\">onPause()<\/a><\/code>\u00a0\u65b9\u6cd5\uff09\u3002\u4f8b\u5982\uff0c\u5982\u679c\u524d\u53f0 Activity \u542f\u52a8\u4e86\u4e00\u4e2a\u5bf9\u8bdd\u6846\uff0c\u5141\u8bb8\u5728\u5176\u540e\u663e\u793a\u4e0a\u4e00 Activity\uff0c\u5219\u6709\u53ef\u80fd\u4f1a\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5<\/li>\n<li>\u6258\u7ba1\u7ed1\u5b9a\u5230\u53ef\u89c1\uff08\u6216\u524d\u53f0\uff09Activity \u7684\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Service.html\">Service<\/a><\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u670d\u52a1\u8fdb\u7a0b<\/strong>\u6b63\u5728\u8fd0\u884c\u5df2\u4f7f\u7528\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/content\/Context.html#startService(android.content.Intent)\">startService()<\/a><\/code>\u00a0\u65b9\u6cd5\u542f\u52a8\u7684\u670d\u52a1\u4e14\u4e0d\u5c5e\u4e8e\u4e0a\u8ff0\u4e24\u4e2a\u66f4\u9ad8\u7c7b\u522b\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u3002\u5c3d\u7ba1\u670d\u52a1\u8fdb\u7a0b\u4e0e\u7528\u6237\u6240\u89c1\u5185\u5bb9\u6ca1\u6709\u76f4\u63a5\u5173\u8054\uff0c\u4f46\u662f\u5b83\u4eec\u901a\u5e38\u5728\u6267\u884c\u4e00\u4e9b\u7528\u6237\u5173\u5fc3\u7684\u64cd\u4f5c\uff08\u4f8b\u5982\uff0c\u5728\u540e\u53f0\u64ad\u653e\u97f3\u4e50\u6216\u4ece\u7f51\u7edc\u4e0b\u8f7d\u6570\u636e\uff09\u3002\u56e0\u6b64\uff0c\u9664\u975e\u5185\u5b58\u4e0d\u8db3\u4ee5\u7ef4\u6301\u6240\u6709\u524d\u53f0\u8fdb\u7a0b\u548c\u53ef\u89c1\u8fdb\u7a0b\u540c\u65f6\u8fd0\u884c\uff0c\u5426\u5219\u7cfb\u7edf\u4f1a\u8ba9\u670d\u52a1\u8fdb\u7a0b\u4fdd\u6301\u8fd0\u884c\u72b6\u6001\u3002<\/li>\n<li><strong>\u540e\u53f0\u8fdb\u7a0b<\/strong>\u5305\u542b\u76ee\u524d\u5bf9\u7528\u6237\u4e0d\u53ef\u89c1\u7684 Activity \u7684\u8fdb\u7a0b\uff08\u5df2\u8c03\u7528 Activity \u7684\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Activity.html#onStop()\">onStop()<\/a><\/code>\u00a0\u65b9\u6cd5\uff09\u3002\u8fd9\u4e9b\u8fdb\u7a0b\u5bf9\u7528\u6237\u4f53\u9a8c\u6ca1\u6709\u76f4\u63a5\u5f71\u54cd\uff0c\u7cfb\u7edf\u53ef\u80fd\u968f\u65f6\u7ec8\u6b62\u5b83\u4eec\uff0c\u4ee5\u56de\u6536\u5185\u5b58\u4f9b\u524d\u53f0\u8fdb\u7a0b\u3001\u53ef\u89c1\u8fdb\u7a0b\u6216\u670d\u52a1\u8fdb\u7a0b\u4f7f\u7528\u3002 \u901a\u5e38\u4f1a\u6709\u5f88\u591a\u540e\u53f0\u8fdb\u7a0b\u5728\u8fd0\u884c\uff0c\u56e0\u6b64\u5b83\u4eec\u4f1a\u4fdd\u5b58\u5728 LRU \uff08\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\uff09\u5217\u8868\u4e2d\uff0c\u4ee5\u786e\u4fdd\u5305\u542b\u7528\u6237\u6700\u8fd1\u67e5\u770b\u7684 Activity \u7684\u8fdb\u7a0b\u6700\u540e\u4e00\u4e2a\u88ab\u7ec8\u6b62\u3002\u5982\u679c\u67d0\u4e2a Activity \u6b63\u786e\u5b9e\u73b0\u4e86\u751f\u547d\u5468\u671f\u65b9\u6cd5\uff0c\u5e76\u4fdd\u5b58\u4e86\u5176\u5f53\u524d\u72b6\u6001\uff0c\u5219\u7ec8\u6b62\u5176\u8fdb\u7a0b\u4e0d\u4f1a\u5bf9\u7528\u6237\u4f53\u9a8c\u4ea7\u751f\u660e\u663e\u5f71\u54cd\uff0c\u56e0\u4e3a\u5f53\u7528\u6237\u5bfc\u822a\u56de\u8be5 Activity \u65f6\uff0cActivity \u4f1a\u6062\u590d\u5176\u6240\u6709\u53ef\u89c1\u72b6\u6001\u3002 \u6709\u5173\u4fdd\u5b58\u548c\u6062\u590d\u72b6\u6001\u7684\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605<a href=\"https:\/\/developer.android.com\/guide\/components\/activities.html#SavingActivityState\">Activity<\/a>\u6587\u6863\u3002<\/li>\n<li><strong>\u7a7a\u8fdb\u7a0b<\/strong>\u4e0d\u542b\u4efb\u4f55\u6d3b\u52a8\u5e94\u7528\u7ec4\u4ef6\u7684\u8fdb\u7a0b\u3002\u4fdd\u7559\u8fd9\u79cd\u8fdb\u7a0b\u7684\u7684\u552f\u4e00\u76ee\u7684\u662f\u7528\u4f5c\u7f13\u5b58\uff0c\u4ee5\u7f29\u77ed\u4e0b\u6b21\u5728\u5176\u4e2d\u8fd0\u884c\u7ec4\u4ef6\u6240\u9700\u7684\u542f\u52a8\u65f6\u95f4\u3002 \u4e3a\u4f7f\u603b\u4f53\u7cfb\u7edf\u8d44\u6e90\u5728\u8fdb\u7a0b\u7f13\u5b58\u548c\u5e95\u5c42\u5185\u6838\u7f13\u5b58\u4e4b\u95f4\u4fdd\u6301\u5e73\u8861\uff0c\u7cfb\u7edf\u5f80\u5f80\u4f1a\u7ec8\u6b62\u8fd9\u4e9b\u8fdb\u7a0b\u3002<\/li>\n<\/ol>\n<p>\u6839\u636e\u8fdb\u7a0b\u4e2d\u5f53\u524d\u6d3b\u52a8\u7ec4\u4ef6\u7684\u91cd\u8981\u7a0b\u5ea6\uff0cAndroid \u4f1a\u5c06\u8fdb\u7a0b\u8bc4\u5b9a\u4e3a\u5b83\u53ef\u80fd\u8fbe\u5230\u7684\u6700\u9ad8\u7ea7\u522b\u3002\u4f8b\u5982\uff0c\u5982\u679c\u67d0\u8fdb\u7a0b\u6258\u7ba1\u7740\u670d\u52a1\u548c\u53ef\u89c1 Activity\uff0c\u5219\u4f1a\u5c06\u6b64\u8fdb\u7a0b\u8bc4\u5b9a\u4e3a\u53ef\u89c1\u8fdb\u7a0b\uff0c\u800c\u4e0d\u662f\u670d\u52a1\u8fdb\u7a0b\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u7684\u7ea7\u522b\u53ef\u80fd\u4f1a\u56e0\u5176\u4ed6\u8fdb\u7a0b\u5bf9\u5b83\u7684\u4f9d\u8d56\u800c\u6709\u6240\u63d0\u9ad8\uff0c\u5373\u670d\u52a1\u4e8e\u53e6\u4e00\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u5176\u7ea7\u522b\u6c38\u8fdc\u4e0d\u4f1a\u4f4e\u4e8e\u5176\u6240\u670d\u52a1\u7684\u8fdb\u7a0b\u3002 \u4f8b\u5982\uff0c\u5982\u679c\u8fdb\u7a0b A \u4e2d\u7684\u5185\u5bb9\u63d0\u4f9b\u7a0b\u5e8f\u4e3a\u8fdb\u7a0b B \u4e2d\u7684\u5ba2\u6237\u7aef\u63d0\u4f9b\u670d\u52a1\uff0c\u6216\u8005\u5982\u679c\u8fdb\u7a0b A \u4e2d\u7684\u670d\u52a1\u7ed1\u5b9a\u5230\u8fdb\u7a0b B \u4e2d\u7684\u7ec4\u4ef6\uff0c\u5219\u8fdb\u7a0b A \u59cb\u7ec8\u88ab\u89c6\u4e3a\u81f3\u5c11\u4e0e\u8fdb\u7a0b B \u540c\u6837\u91cd\u8981\u3002<\/p>\n<p>\u7531\u4e8e\u8fd0\u884c\u670d\u52a1\u7684\u8fdb\u7a0b\u5176\u7ea7\u522b\u9ad8\u4e8e\u6258\u7ba1\u540e\u53f0 Activity \u7684\u8fdb\u7a0b\uff0c\u56e0\u6b64\u542f\u52a8\u957f\u65f6\u95f4\u8fd0\u884c\u64cd\u4f5c\u7684 Activity \u6700\u597d\u4e3a\u8be5\u64cd\u4f5c\u542f\u52a8<a href=\"https:\/\/developer.android.com\/guide\/components\/services.html\">\u670d\u52a1<\/a>\uff0c\u800c\u4e0d\u662f\u7b80\u5355\u5730\u521b\u5efa\u5de5\u4f5c\u7ebf\u7a0b\uff0c\u5f53\u64cd\u4f5c\u6709\u53ef\u80fd\u6bd4 Activity \u66f4\u52a0\u6301\u4e45\u65f6\u5c24\u8981\u5982\u6b64\u3002\u4f8b\u5982\uff0c\u6b63\u5728\u5c06\u56fe\u7247\u4e0a\u4f20\u5230\u7f51\u7ad9\u7684 Activity \u5e94\u8be5\u542f\u52a8\u670d\u52a1\u6765\u6267\u884c\u4e0a\u4f20\uff0c\u8fd9\u6837\u4e00\u6765\uff0c\u5373\u4f7f\u7528\u6237\u9000\u51fa Activity\uff0c\u4ecd\u53ef\u5728\u540e\u53f0\u7ee7\u7eed\u6267\u884c\u4e0a\u4f20\u64cd\u4f5c\u3002\u4f7f\u7528\u670d\u52a1\u53ef\u4ee5\u4fdd\u8bc1\uff0c\u65e0\u8bba Activity \u53d1\u751f\u4ec0\u4e48\u60c5\u51b5\uff0c\u8be5\u64cd\u4f5c\u81f3\u5c11\u5177\u5907\u201c\u670d\u52a1\u8fdb\u7a0b\u201d\u4f18\u5148\u7ea7\u3002 \u540c\u7406\uff0c\u5e7f\u64ad\u63a5\u6536\u5668\u4e5f\u5e94\u4f7f\u7528\u670d\u52a1\uff0c\u800c\u4e0d\u662f\u7b80\u5355\u5730\u5c06\u8017\u65f6\u5197\u957f\u7684\u64cd\u4f5c\u653e\u5165\u7ebf\u7a0b\u4e2d\u3002<\/p>\n<h2 id=\"Threads\">\u7ebf\u7a0b<\/h2>\n<hr \/>\n<p>\u5e94\u7528\u542f\u52a8\u65f6\uff0c\u7cfb\u7edf\u4f1a\u4e3a\u5e94\u7528\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a\u201c\u4e3b\u7ebf\u7a0b\u201d\u7684\u6267\u884c\u7ebf\u7a0b\u3002 \u6b64\u7ebf\u7a0b\u975e\u5e38\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u8d1f\u8d23\u5c06\u4e8b\u4ef6\u5206\u6d3e\u7ed9\u76f8\u5e94\u7684\u7528\u6237\u754c\u9762\u5c0f\u5de5\u5177\uff0c\u5176\u4e2d\u5305\u62ec\u7ed8\u56fe\u4e8b\u4ef6\u3002 \u6b64\u5916\uff0c\u5b83\u4e5f\u662f\u5e94\u7528\u4e0e Android UI \u5de5\u5177\u5305\u7ec4\u4ef6\uff08\u6765\u81ea\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/widget\/package-summary.html\">android.widget<\/a><\/code>\u00a0\u548c\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/view\/package-summary.html\">android.view<\/a><\/code>\u00a0\u8f6f\u4ef6\u5305\u7684\u7ec4\u4ef6\uff09\u8fdb\u884c\u4ea4\u4e92\u7684\u7ebf\u7a0b\u3002\u56e0\u6b64\uff0c\u4e3b\u7ebf\u7a0b\u6709\u65f6\u4e5f\u79f0\u4e3a UI \u7ebf\u7a0b\u3002<\/p>\n<p>\u7cfb\u7edf\u7edd\u5bf9\u4e0d\u4f1a\u4e3a\u6bcf\u4e2a\u7ec4\u4ef6\u5b9e\u4f8b\u521b\u5efa\u5355\u72ec\u7684\u7ebf\u7a0b\u3002\u8fd0\u884c\u4e8e\u540c\u4e00\u8fdb\u7a0b\u7684\u6240\u6709\u7ec4\u4ef6\u5747\u5728 UI \u7ebf\u7a0b\u4e2d\u5b9e\u4f8b\u5316\uff0c\u5e76\u4e14\u5bf9\u6bcf\u4e2a\u7ec4\u4ef6\u7684\u7cfb\u7edf\u8c03\u7528\u5747\u7531\u8be5\u7ebf\u7a0b\u8fdb\u884c\u5206\u6d3e\u3002\u56e0\u6b64\uff0c\u54cd\u5e94\u7cfb\u7edf\u56de\u8c03\u7684\u65b9\u6cd5\uff08\u4f8b\u5982\uff0c\u62a5\u544a\u7528\u6237\u64cd\u4f5c\u7684\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/view\/View.html#onKeyDown(int, android.view.KeyEvent)\">onKeyDown()<\/a><\/code>\u00a0\u6216\u751f\u547d\u5468\u671f\u56de\u8c03\u65b9\u6cd5\uff09\u59cb\u7ec8\u5728\u8fdb\u7a0b\u7684 UI \u7ebf\u7a0b\u4e2d\u8fd0\u884c\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5f53\u7528\u6237\u89e6\u6478\u5c4f\u5e55\u4e0a\u7684\u6309\u94ae\u65f6\uff0c\u5e94\u7528\u7684 UI \u7ebf\u7a0b\u4f1a\u5c06\u89e6\u6478\u4e8b\u4ef6\u5206\u6d3e\u7ed9\u5c0f\u5de5\u5177\uff0c\u800c\u5c0f\u5de5\u5177\u53cd\u8fc7\u6765\u53c8\u8bbe\u7f6e\u5176\u6309\u4e0b\u72b6\u6001\uff0c\u5e76\u5c06\u65e0\u6548\u8bf7\u6c42\u53d1\u5e03\u5230\u4e8b\u4ef6\u961f\u5217\u4e2d\u3002UI \u7ebf\u7a0b\u4ece\u961f\u5217\u4e2d\u53d6\u6d88\u8be5\u8bf7\u6c42\u5e76\u901a\u77e5\u5c0f\u5de5\u5177\u5e94\u8be5\u91cd\u7ed8\u81ea\u8eab\u3002<\/p>\n<p>\u5728\u5e94\u7528\u6267\u884c\u7e41\u91cd\u7684\u4efb\u52a1\u4ee5\u54cd\u5e94\u7528\u6237\u4ea4\u4e92\u65f6\uff0c\u9664\u975e\u6b63\u786e\u5b9e\u65bd\u5e94\u7528\uff0c\u5426\u5219\u8fd9\u79cd\u5355\u7ebf\u7a0b\u6a21\u5f0f\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u4f4e\u4e0b\u3002 \u7279\u522b\u5730\uff0c\u5982\u679c UI \u7ebf\u7a0b\u9700\u8981\u5904\u7406\u6240\u6709\u4efb\u52a1\uff0c\u5219\u6267\u884c\u8017\u65f6\u5f88\u957f\u7684\u64cd\u4f5c\uff08\u4f8b\u5982\uff0c\u7f51\u7edc\u8bbf\u95ee\u6216\u6570\u636e\u5e93\u67e5\u8be2\uff09\u5c06\u4f1a\u963b\u585e\u6574\u4e2a UI\u3002\u4e00\u65e6\u7ebf\u7a0b\u88ab\u963b\u585e\uff0c\u5c06\u65e0\u6cd5\u5206\u6d3e\u4efb\u4f55\u4e8b\u4ef6\uff0c\u5305\u62ec\u7ed8\u56fe\u4e8b\u4ef6\u3002\u4ece\u7528\u6237\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u5e94\u7528\u663e\u793a\u4e3a\u6302\u8d77\u3002 \u66f4\u7cdf\u7cd5\u7684\u662f\uff0c\u5982\u679c UI \u7ebf\u7a0b\u88ab\u963b\u585e\u8d85\u8fc7\u51e0\u79d2\u949f\u65f6\u95f4\uff08\u76ee\u524d\u5927\u7ea6\u662f 5 \u79d2\u949f\uff09\uff0c\u7528\u6237\u5c31\u4f1a\u770b\u5230\u4e00\u4e2a\u8ba9\u4eba\u538c\u70e6\u7684\u201c<a href=\"http:\/\/developer.android.com\/guide\/practices\/responsiveness.html\">\u5e94\u7528\u65e0\u54cd\u5e94<\/a>\u201d(ANR) \u5bf9\u8bdd\u6846\u3002\u5982\u679c\u5f15\u8d77\u7528\u6237\u4e0d\u6ee1\uff0c\u4ed6\u4eec\u53ef\u80fd\u5c31\u4f1a\u51b3\u5b9a\u9000\u51fa\u5e76\u5378\u8f7d\u6b64\u5e94\u7528\u3002<\/p>\n<p>\u6b64\u5916\uff0cAndroid UI \u5de5\u5177\u5305\u5e76\u975e\u7ebf\u7a0b\u5b89\u5168\u5de5\u5177\u5305\u3002\u56e0\u6b64\uff0c\u60a8\u4e0d\u5f97\u901a\u8fc7\u5de5\u4f5c\u7ebf\u7a0b\u64cd\u7eb5 UI\uff0c\u800c\u53ea\u80fd\u901a\u8fc7 UI \u7ebf\u7a0b\u64cd\u7eb5\u7528\u6237\u754c\u9762\u3002\u56e0\u6b64\uff0cAndroid \u7684\u5355\u7ebf\u7a0b\u6a21\u5f0f\u5fc5\u987b\u9075\u5b88\u4e24\u6761\u89c4\u5219\uff1a<\/p>\n<ol class=\" list-paddingleft-2\">\n<li>\u4e0d\u8981\u963b\u585e UI \u7ebf\u7a0b<\/li>\n<li>\u4e0d\u8981\u5728 UI \u7ebf\u7a0b\u4e4b\u5916\u8bbf\u95ee Android UI \u5de5\u5177\u5305<\/li>\n<\/ol>\n<h3 id=\"WorkerThreads\">\u5de5\u4f5c\u7ebf\u7a0b<\/h3>\n<p>\u6839\u636e\u4e0a\u8ff0\u5355\u7ebf\u7a0b\u6a21\u5f0f\uff0c\u8981\u4fdd\u8bc1\u5e94\u7528 UI \u7684\u54cd\u5e94\u80fd\u529b\uff0c\u5173\u952e\u662f\u4e0d\u80fd\u963b\u585e UI \u7ebf\u7a0b\u3002\u5982\u679c\u6267\u884c\u7684\u64cd\u4f5c\u4e0d\u80fd\u5f88\u5feb\u5b8c\u6210\uff0c\u5219\u5e94\u786e\u4fdd\u5b83\u4eec\u5728\u5355\u72ec\u7684\u7ebf\u7a0b\uff08\u201c\u540e\u53f0\u201d\u6216\u201c\u5de5\u4f5c\u201d\u7ebf\u7a0b\uff09\u4e2d\u8fd0\u884c\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u6f14\u793a\u4e86\u4e00\u4e2a\u70b9\u51fb\u4fa6\u542c\u5668\u4ece\u5355\u72ec\u7684\u7ebf\u7a0b\u4e0b\u8f7d\u56fe\u50cf\u5e76\u5c06\u5176\u663e\u793a\u5728\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/widget\/ImageView.html\">ImageView<\/a><\/code>\u00a0\u4e2d\uff1a<\/p>\n<pre class=\"prettyprint\"><span class=\"kwd\">public<\/span> <span class=\"kwd\">void<\/span><span class=\"pln\"> onClick<\/span><span class=\"pun\">(<\/span><span class=\"typ\">View<\/span><span class=\"pln\"> v<\/span><span class=\"pun\">)<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 <\/span><span class=\"kwd\">new<\/span> <span class=\"typ\">Thread<\/span><span class=\"pun\">(<\/span><span class=\"kwd\">new<\/span> <span class=\"typ\">Runnable<\/span><span class=\"pun\">()<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"kwd\">public<\/span> <span class=\"kwd\">void<\/span><span class=\"pln\"> run<\/span><span class=\"pun\">()<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"typ\">Bitmap<\/span><span class=\"pln\"> b <\/span><span class=\"pun\">=<\/span><span class=\"pln\"> loadImageFromNetwork<\/span><span class=\"pun\">(<\/span><span class=\"str\">\"http:\/\/example.com\/image.png\"<\/span><span class=\"pun\">);<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 mImageView<\/span><span class=\"pun\">.<\/span><span class=\"pln\">setImageBitmap<\/span><span class=\"pun\">(<\/span><span class=\"pln\">b<\/span><span class=\"pun\">);<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"pun\">}<\/span><span class=\"pln\">\n\u00a0 \u00a0 <\/span><span class=\"pun\">}).<\/span><span class=\"pln\">start<\/span><span class=\"pun\">();<\/span>\n<span class=\"pun\">}<\/span><\/pre>\n<p>\u4e4d\u770b\u8d77\u6765\uff0c\u8fd9\u6bb5\u4ee3\u7801\u4f3c\u4e4e\u8fd0\u884c\u826f\u597d\uff0c\u56e0\u4e3a\u5b83\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7ebf\u7a0b\u6765\u5904\u7406\u7f51\u7edc\u64cd\u4f5c\u3002 \u4f46\u662f\uff0c\u5b83\u8fdd\u53cd\u4e86\u5355\u7ebf\u7a0b\u6a21\u5f0f\u7684\u7b2c\u4e8c\u6761\u89c4\u5219\uff1a\u4e0d\u8981\u5728 UI \u7ebf\u7a0b\u4e4b\u5916\u8bbf\u95ee Android UI \u5de5\u5177\u5305\u2014\u6b64\u793a\u4f8b\u4ece\u5de5\u4f5c\u7ebf\u7a0b\uff08\u800c\u4e0d\u662f UI \u7ebf\u7a0b\uff09\u4fee\u6539\u4e86\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/widget\/ImageView.html\">ImageView<\/a><\/code>\u3002\u8fd9\u53ef\u80fd\u5bfc\u81f4\u51fa\u73b0\u4e0d\u660e\u786e\u3001\u4e0d\u53ef\u9884\u89c1\u7684\u884c\u4e3a\uff0c\u4f46\u8981\u8ddf\u8e2a\u6b64\u884c\u4e3a\u56f0\u96be\u800c\u53c8\u8d39\u65f6\u3002<\/p>\n<p>\u4e3a\u89e3\u51b3\u6b64\u95ee\u9898\uff0cAndroid \u63d0\u4f9b\u4e86\u51e0\u79cd\u9014\u5f84\u6765\u4ece\u5176\u4ed6\u7ebf\u7a0b\u8bbf\u95ee UI \u7ebf\u7a0b\u3002\u4ee5\u4e0b\u5217\u51fa\u4e86\u51e0\u79cd\u6709\u7528\u7684\u65b9\u6cd5\uff1a<\/p>\n<ul class=\" list-paddingleft-2\">\n<li><code><a href=\"https:\/\/developer.android.com\/reference\/android\/app\/Activity.html#runOnUiThread(java.lang.Runnable)\">Activity.runOnUiThread(Runnable)<\/a><\/code><\/li>\n<li><code><a href=\"https:\/\/developer.android.com\/reference\/android\/view\/View.html#post(java.lang.Runnable)\">View.post(Runnable)<\/a><\/code><\/li>\n<li><code><a href=\"https:\/\/developer.android.com\/reference\/android\/view\/View.html#postDelayed(java.lang.Runnable, long)\">View.postDelayed(Runnable, long)<\/a><\/code><\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/view\/View.html#post(java.lang.Runnable)\">View.post(Runnable)<\/a><\/code>\u00a0\u65b9\u6cd5\u4fee\u590d\u4e0a\u8ff0\u4ee3\u7801\uff1a<\/p>\n<pre class=\"prettyprint\"><span class=\"kwd\">public<\/span> <span class=\"kwd\">void<\/span><span class=\"pln\"> onClick<\/span><span class=\"pun\">(<\/span><span class=\"typ\">View<\/span><span class=\"pln\"> v<\/span><span class=\"pun\">)<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 <\/span><span class=\"kwd\">new<\/span> <span class=\"typ\">Thread<\/span><span class=\"pun\">(<\/span><span class=\"kwd\">new<\/span> <span class=\"typ\">Runnable<\/span><span class=\"pun\">()<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"kwd\">public<\/span> <span class=\"kwd\">void<\/span><span class=\"pln\"> run<\/span><span class=\"pun\">()<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"kwd\">final<\/span> <span class=\"typ\">Bitmap<\/span><span class=\"pln\"> bitmap <\/span><span class=\"pun\">=<\/span><span class=\"pln\"> loadImageFromNetwork<\/span><span class=\"pun\">(<\/span><span class=\"str\">\"http:\/\/example.com\/image.png\"<\/span><span class=\"pun\">);<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 mImageView<\/span><span class=\"pun\">.<\/span><span class=\"pln\">post<\/span><span class=\"pun\">(<\/span><span class=\"kwd\">new<\/span> <span class=\"typ\">Runnable<\/span><span class=\"pun\">()<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"kwd\">public<\/span> <span class=\"kwd\">void<\/span><span class=\"pln\"> run<\/span><span class=\"pun\">()<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 mImageView<\/span><span class=\"pun\">.<\/span><span class=\"pln\">setImageBitmap<\/span><span class=\"pun\">(<\/span><span class=\"pln\">bitmap<\/span><span class=\"pun\">);<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"pun\">}<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"pun\">});<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"pun\">}<\/span><span class=\"pln\">\n\u00a0 \u00a0 <\/span><span class=\"pun\">}).<\/span><span class=\"pln\">start<\/span><span class=\"pun\">();<\/span>\n<span class=\"pun\">}<\/span><\/pre>\n<p>\u73b0\u5728\uff0c\u4e0a\u8ff0\u5b9e\u73b0\u5c5e\u4e8e\u7ebf\u7a0b\u5b89\u5168\u578b\uff1a\u5728\u5355\u72ec\u7684\u7ebf\u7a0b\u4e2d\u5b8c\u6210\u7f51\u7edc\u64cd\u4f5c\uff0c\u800c\u5728 UI \u7ebf\u7a0b\u4e2d\u64cd\u7eb5\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/widget\/ImageView.html\">ImageView<\/a><\/code>\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u968f\u7740\u64cd\u4f5c\u65e5\u8d8b\u590d\u6742\uff0c\u8fd9\u7c7b\u4ee3\u7801\u4e5f\u4f1a\u53d8\u5f97\u590d\u6742\u4e14\u96be\u4ee5\u7ef4\u62a4\u3002 \u8981\u901a\u8fc7\u5de5\u4f5c\u7ebf\u7a0b\u5904\u7406\u66f4\u590d\u6742\u7684\u4ea4\u4e92\uff0c\u53ef\u4ee5\u8003\u8651\u5728\u5de5\u4f5c\u7ebf\u7a0b\u4e2d\u4f7f\u7528\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/Handler.html\">Handler<\/a><\/code>\u00a0\u5904\u7406\u6765\u81ea UI \u7ebf\u7a0b\u7684\u6d88\u606f\u3002\u5f53\u7136\uff0c\u6700\u597d\u7684\u89e3\u51b3\u65b9\u6848\u6216\u8bb8\u662f\u6269\u5c55\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html\">AsyncTask<\/a><\/code>\u00a0\u7c7b\uff0c\u6b64\u7c7b\u7b80\u5316\u4e86\u4e0e UI \u8fdb\u884c\u4ea4\u4e92\u6240\u9700\u6267\u884c\u7684\u5de5\u4f5c\u7ebf\u7a0b\u4efb\u52a1\u3002<\/p>\n<h4 id=\"AsyncTask\">\u4f7f\u7528 AsyncTask<\/h4>\n<p><code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html\">AsyncTask<\/a><\/code>\u00a0\u5141\u8bb8\u5bf9\u7528\u6237\u754c\u9762\u6267\u884c\u5f02\u6b65\u64cd\u4f5c\u3002\u5b83\u4f1a\u5148\u963b\u585e\u5de5\u4f5c\u7ebf\u7a0b\u4e2d\u7684\u64cd\u4f5c\uff0c\u7136\u540e\u5728 UI \u7ebf\u7a0b\u4e2d\u53d1\u5e03\u7ed3\u679c\uff0c\u800c\u65e0\u9700\u60a8\u4eb2\u81ea\u5904\u7406\u7ebf\u7a0b\u548c\/\u6216\u5904\u7406\u7a0b\u5e8f\u3002<\/p>\n<p>\u8981\u4f7f\u7528\u5b83\uff0c\u5fc5\u987b\u521b\u5efa\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html\">AsyncTask<\/a><\/code>\u00a0\u5b50\u7c7b\u5e76\u5b9e\u73b0\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#doInBackground(Params...)\">doInBackground()<\/a><\/code>\u00a0\u56de\u8c03\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u5c06\u5728\u540e\u53f0\u7ebf\u7a0b\u6c60\u4e2d\u8fd0\u884c\u3002\u8981\u66f4\u65b0 UI\uff0c\u5fc5\u987b\u5b9e\u73b0\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#onPostExecute(Result)\">onPostExecute()<\/a><\/code>\u00a0\u4ee5\u4f20\u9012<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#doInBackground(Params...)\">doInBackground()<\/a><\/code>\u00a0\u8fd4\u56de\u7684\u7ed3\u679c\u5e76\u5728 UI \u7ebf\u7a0b\u4e2d\u8fd0\u884c\uff0c\u8fd9\u6837\uff0c\u60a8\u5373\u53ef\u5b89\u5168\u66f4\u65b0 UI\u3002\u7a0d\u540e\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u4ece UI \u7ebf\u7a0b\u8c03\u7528\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#execute(Params...)\">execute()<\/a><\/code>\u00a0\u6765\u8fd0\u884c\u4efb\u52a1\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u4f7f\u7528\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html\">AsyncTask<\/a><\/code>\u00a0\u6765\u5b9e\u73b0\u4e0a\u8ff0\u793a\u4f8b\uff1a<\/p>\n<pre class=\"prettyprint\"><span class=\"kwd\">public<\/span> <span class=\"kwd\">void<\/span><span class=\"pln\"> onClick<\/span><span class=\"pun\">(<\/span><span class=\"typ\">View<\/span><span class=\"pln\"> v<\/span><span class=\"pun\">)<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 <\/span><span class=\"kwd\">new<\/span> <span class=\"typ\">DownloadImageTask<\/span><span class=\"pun\">().<\/span><span class=\"pln\">execute<\/span><span class=\"pun\">(<\/span><span class=\"str\">\"http:\/\/example.com\/image.png\"<\/span><span class=\"pun\">);<\/span>\n<span class=\"pun\">}<\/span>\n\n<span class=\"kwd\">private<\/span> <span class=\"kwd\">class<\/span> <span class=\"typ\">DownloadImageTask<\/span> <span class=\"kwd\">extends<\/span> <span class=\"typ\">AsyncTask<\/span><span class=\"pun\">&lt;<\/span><span class=\"typ\">String<\/span><span class=\"pun\">,<\/span> <span class=\"typ\">Void<\/span><span class=\"pun\">,<\/span> <span class=\"typ\">Bitmap<\/span><span class=\"pun\">&gt;<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 <\/span>\/** The system calls this to perform work in a worker thread and\n\u00a0 \u00a0 \u00a0 * delivers it the parameters given to AsyncTask.execute() *\/<span class=\"pln\">\n\u00a0 \u00a0 <\/span><span class=\"kwd\">protected<\/span> <span class=\"typ\">Bitmap<\/span><span class=\"pln\"> doInBackground<\/span><span class=\"pun\">(<\/span><span class=\"typ\">String<\/span><span class=\"pun\">...<\/span><span class=\"pln\"> urls<\/span><span class=\"pun\">)<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 <\/span><span class=\"kwd\">return<\/span><span class=\"pln\"> loadImageFromNetwork<\/span><span class=\"pun\">(<\/span><span class=\"pln\">urls<\/span><span class=\"pun\">[<\/span><span class=\"lit\">0<\/span><span class=\"pun\">]);<\/span><span class=\"pln\">\n\u00a0 \u00a0 <\/span><span class=\"pun\">}<\/span><span class=\"pln\">\n\n\u00a0 \u00a0 <\/span>\/** The system calls this to perform work in the UI thread and delivers\n\u00a0 \u00a0 \u00a0 * the result from doInBackground() *\/<span class=\"pln\">\n\u00a0 \u00a0 <\/span><span class=\"kwd\">protected<\/span> <span class=\"kwd\">void<\/span><span class=\"pln\"> onPostExecute<\/span><span class=\"pun\">(<\/span><span class=\"typ\">Bitmap<\/span><span class=\"pln\"> result<\/span><span class=\"pun\">)<\/span> <span class=\"pun\">{<\/span><span class=\"pln\">\n\u00a0 \u00a0 \u00a0 \u00a0 mImageView<\/span><span class=\"pun\">.<\/span><span class=\"pln\">setImageBitmap<\/span><span class=\"pun\">(<\/span><span class=\"pln\">result<\/span><span class=\"pun\">);<\/span><span class=\"pln\">\n\u00a0 \u00a0 <\/span><span class=\"pun\">}<\/span>\n<span class=\"pun\">}<\/span><\/pre>\n<p>\u73b0\u5728 UI \u662f\u5b89\u5168\u7684\uff0c\u4ee3\u7801\u4e5f\u5f97\u5230\u7b80\u5316\uff0c\u56e0\u4e3a\u4efb\u52a1\u5206\u89e3\u6210\u4e86\u4e24\u90e8\u5206\uff1a\u4e00\u90e8\u5206\u5e94\u5728\u5de5\u4f5c\u7ebf\u7a0b\u5185\u5b8c\u6210\uff0c\u53e6\u4e00\u90e8\u5206\u5e94\u5728 UI \u7ebf\u7a0b\u5185\u5b8c\u6210\u3002<\/p>\n<p>\u4e0b\u9762\u7b80\u8981\u6982\u8ff0\u4e86 AsyncTask \u7684\u5de5\u4f5c\u65b9\u6cd5\uff0c\u4f46\u8981\u5168\u9762\u4e86\u89e3\u5982\u4f55\u4f7f\u7528\u6b64\u7c7b\uff0c\u60a8\u5e94\u9605\u8bfb\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html\">AsyncTask<\/a><\/code>\u00a0\u53c2\u8003\u6587\u6863\uff1a<\/p>\n<ul class=\" list-paddingleft-2\">\n<li>\u53ef\u4ee5\u4f7f\u7528\u6cdb\u578b\u6307\u5b9a\u53c2\u6570\u7c7b\u578b\u3001\u8fdb\u5ea6\u503c\u548c\u4efb\u52a1\u6700\u7ec8\u503c<\/li>\n<li>\u65b9\u6cd5\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#doInBackground(Params...)\">doInBackground()<\/a><\/code>\u00a0\u4f1a\u5728\u5de5\u4f5c\u7ebf\u7a0b\u4e0a\u81ea\u52a8\u6267\u884c<\/li>\n<li><code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#onPreExecute()\">onPreExecute()<\/a><\/code>\u3001<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#onPostExecute(Result)\">onPostExecute()<\/a><\/code>\u00a0\u548c\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#onProgressUpdate(Progress...)\">onProgressUpdate()<\/a><\/code>\u00a0\u5747\u5728 UI \u7ebf\u7a0b\u4e2d\u8c03\u7528<\/li>\n<li><code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#doInBackground(Params...)\">doInBackground()<\/a><\/code>\u00a0\u8fd4\u56de\u7684\u503c\u5c06\u53d1\u9001\u5230\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#onPostExecute(Result)\">onPostExecute()<\/a><\/code><\/li>\n<li>\u60a8\u53ef\u4ee5\u968f\u65f6\u5728\u00a0<code><a href=\"https:\/\/developer.android.com\/reference\/android\/os\/AsyncTask.html#doInBackground(Params...)\">doInBackground()<\/a><\/code>\u00a0\u4e2d\u8c03\u7528<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-68","post","type-post","status-publish","format-standard","hentry","category-android"],"_links":{"self":[{"href":"https:\/\/www.dd-home.top\/index.php?rest_route=\/wp\/v2\/posts\/68","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dd-home.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dd-home.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dd-home.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dd-home.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=68"}],"version-history":[{"count":0,"href":"https:\/\/www.dd-home.top\/index.php?rest_route=\/wp\/v2\/posts\/68\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.dd-home.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=68"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dd-home.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=68"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dd-home.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=68"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}