{"id":446,"date":"2022-11-30T11:51:59","date_gmt":"2022-11-30T03:51:59","guid":{"rendered":"https:\/\/iichen.cn\/?p=446"},"modified":"2022-11-30T11:51:59","modified_gmt":"2022-11-30T03:51:59","slug":"android-handler%e3%80%81threadlocal","status":"publish","type":"post","link":"https:\/\/iichen.cn\/?p=446","title":{"rendered":"Android-Handler\u3001ThreadLocal"},"content":{"rendered":"<h5>1. Handler<\/h5>\n<blockquote><p>\n  <a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/blog.csdn.net\/weixin_43766753\/article\/details\/108968666\" title=\"Handler\">Handler<\/a><br \/>\n  &#8211; ViewRootImpl -> requestLayout -> scheduleTraversals -> \u4f7f\u7528\u5230\u4e86\u540c\u6b65\u5c4f\u969c\uff0c \u7ed8\u5236\u65f6\u4f1a\u6267\u884cTraversalRunnable\u4efb\u52a1\u7ebf\u7a0b\uff0c\u5176\u4e2d\u4f1a\u79fb\u9664\u540c\u6b65\u5c4f\u969c\n<\/p><\/blockquote>\n<ul>\n<li>ThreadLocal\u9002\u5408\u7528\u4e8e\u5728\u4e0d\u540c\u7ebf\u7a0b\u4f5c\u7528\u57df\u7684\u6570\u636e\u5907\u4efd<\/li>\n<li>ThreadLocal\u673a\u5236\u901a\u8fc7\u5728\u6bcf\u4e2a\u7ebf\u7a0b\u7ef4\u62a4\u4e00\u4e2aThreadLocalMap\uff0c\u5176key\u4e3aThreadLocal\uff0cvalue\u4e3aThreadLocal\u5bf9\u5e94\u7684\u6cdb\u578b\u5bf9\u8c61\uff0c\u8fd9\u6837\u6bcf\u4e2aThreadLocal\u5c31\u53ef\u4ee5\u4f5c\u4e3akey\u5c06\u4e0d\u540c\u7684value\u5b58\u50a8\u5728\u4e0d\u540cThread\u7684Map\u4e2d\uff0c\u5f53\u83b7\u53d6\u6570\u636e\u7684\u65f6\u5019\uff0c\u540c\u4e2aThreadLocal\u5c31\u53ef\u4ee5\u5728\u4e0d\u540c\u7ebf\u7a0b\u7684Map\u4e2d\u5f97\u5230\u4e0d\u540c\u7684\u6570\u636e<\/li>\n<li>ThreadLocalMap\u7c7b\u4f3c\u4e8e\u4e00\u4e2a\u6539\u7248\u7684HashMap\uff0c\u5185\u90e8\u4e5f\u662f\u4f7f\u7528\u6570\u7ec4\u548cHash\u7b97\u6cd5\u6765\u5b58\u50a8\u6570\u636e\uff0c\u4f7f\u5f97\u5b58\u50a8\u548c\u8bfb\u53d6\u7684\u901f\u5ea6\u975e\u5e38\u5feb\u3002<\/li>\n<li>\u540c\u65f6\u4f7f\u7528ThreadLocal\u9700\u8981\u6ce8\u610f\u5185\u5b58\u6cc4\u9732\u95ee\u9898\uff0c\u5f53ThreadLocal\u4e0d\u518d\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u9700\u8981\u901a\u8fc7remove\u65b9\u6cd5\u628avalue\u79fb\u9664\u3002<\/p>\n<\/li>\n<li>\n<p>Android\u7a0b\u5e8f\u7684\u5165\u53e3\u5728ActivityThread\u7684main\u65b9\u6cd5,\u521b\u5efa\u4e86\u4e3b\u7ebf\u7a0b\u7684Looper<\/p>\n<\/li>\n<\/ul>\n<pre><code class=\"language-java line-numbers\">public void dispatchMessage(@NonNull Message msg) {\n    if (msg.callback != null) {\n        handleCallback(msg);\n    } else {\n        if (mCallback != null) {\n            if (mCallback.handleMessage(msg)) {\n                return;\n            }\n        }\n        handleMessage(msg);\n    }\n}\n\nprivate static void handleCallback(Message message) {\n    message.callback.run();\n}\n\n<\/code><\/pre>\n<h5>2. ThreadLocal<\/h5>\n<blockquote>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.jianshu.com\/p\/3c5d7f09dfbd\" title=\"ThreadLocal\">ThreadLocal<\/a>\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>1. Handler Handler &#8211; ViewRootImpl -> requestLayou [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,8],"tags":[],"class_list":["post-446","post","type-post","status-publish","format-standard","hentry","category-android","category-8"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Android-Handler\u3001ThreadLocal - IIchen<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/iichen.cn\/?p=446\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Android-Handler\u3001ThreadLocal - IIchen\" \/>\n<meta property=\"og:description\" content=\"1. 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