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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