时间：2021-07-11 08:42:37 | 栏目：Android代码 | 点击：次
Android HandlerThread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：
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Handler.Callback;
import android.os.HandlerThread;
import android.os.Message;
public class MainActivity extends Activity {
HandlerThread handlerThread = new HandlerThread("test");
Handler handler;
@Override
protected void onCreate(Bundle savedInstanceState) {
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 = new Handler();
//post(runnable)，将runnable运行在handlerThread中，这是非UIThread的
handler = new Handler(handlerThread.getLooper(), new Callback() {
@Override
public boolean handleMessage(Message msg) {
System.out.println("receive message.whatA=" + msg.what);
if (msg.what == 1) {
return true;//不再向外层传递
} else {
return false; //外层的handleMessage() 继续执行
}
}
}) {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
System.out.println("receive message.whatB=" + msg.what);
}
};
handler.post(new Runnable() {
@Override
public void run() {
System.out.println("handler_post_cur_id="+Thread.currentThread().getId());
handler.sendEmptyMessage(1);
handler.sendEmptyMessage(2);
}
});
}
}
运行结果：
01-23 07:12:31.590: I/System.out(12386): cur_id=1 01-23 07:12:31.590: I/System.out(12386): handlerThread.id=1866 01-23 07:12:31.590: I/System.out(12386): handler_post_cur_id=1866 01-23 07:12:31.600: I/System.out(12386): receive message.whatA=1 01-23 07:12:31.600: I/System.out(12386): receive message.whatA=2 01-23 07:12:31.600: I/System.out(12386): receive message.whatB=2
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