Android HandlerThread使用方法详解
AndroidHandlerThread使用方法详解
HandlerThread继承自Thread,内部封装了Looper。
首先Handler和HandlerThread的主要区别是:Handler与Activity在同一个线程中,HandlerThread与Activity不在同一个线程,而是别外新的线程中(Handler中不能做耗时的操作)。
用法:
importandroid.app.Activity; importandroid.os.Bundle; importandroid.os.Handler; importandroid.os.Handler.Callback; importandroid.os.HandlerThread; importandroid.os.Message; publicclassMainActivityextendsActivity{ HandlerThreadhandlerThread=newHandlerThread("test"); Handlerhandler; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); System.out.println("cur_id="+Thread.currentThread().getId()); handlerThread.start(); System.out.println("handlerThread.id="+handlerThread.getId()); //post(runnable),只是直接运行了run(),run()内ThreadId与UIThread是一样的 //handler=newHandler(); //post(runnable),将runnable运行在handlerThread中,这是非UIThread的 handler=newHandler(handlerThread.getLooper(),newCallback(){ @Override publicbooleanhandleMessage(Messagemsg){ System.out.println("receivemessage.whatA="+msg.what); if(msg.what==1){ returntrue;//不再向外层传递 }else{ returnfalse;//外层的handleMessage()继续执行 } } }){ @Override publicvoidhandleMessage(Messagemsg){ //TODOAuto-generatedmethodstub super.handleMessage(msg); System.out.println("receivemessage.whatB="+msg.what); } }; handler.post(newRunnable(){ @Override publicvoidrun(){ System.out.println("handler_post_cur_id="+Thread.currentThread().getId()); handler.sendEmptyMessage(1); handler.sendEmptyMessage(2); } }); } }
运行结果:
01-2307:12:31.590:I/System.out(12386):cur_id=1 01-2307:12:31.590:I/System.out(12386):handlerThread.id=1866 01-2307:12:31.590:I/System.out(12386):handler_post_cur_id=1866 01-2307:12:31.600:I/System.out(12386):receivemessage.whatA=1 01-2307:12:31.600:I/System.out(12386):receivemessage.whatA=2 01-2307:12:31.600:I/System.out(12386):receivemessage.whatB=2
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