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详解Android Handler机制和原理

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By Looper.prepare wasn't called, Take A Callback, Callback callback
| Elecfans
Handler的使用 在Android开发中，Handler机制是一个很重要的知识点，主要用于消息通信。 Handler使用的三大步骤： 1、Loop.prepare()。 2、new一个Handler对象，并重写handleMessage方法。 3、Loop.loop()。 先运行实例代码观察现象，再深入分析内部原理。 publicclassLooperThreadextendsThread{ privatestaticfinalString TAG = LooperThread.class.getSimpleName(); privateHandler handler; @Override publicvoidrun(){ Looper.prepare(); handler = newHandler(Looper.myLooper(), newHandler.Callback() { @Override publicbooleanhandleMessage(@NonNull Message msg){ Log.d(TAG, "what: "+ msg.what + ",...
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