Question

android编程：Handler的handleMessage在发送消息后没有立即被调用

界面一个ProgressBar，主线程用来更新进度，创建一个线程执行“任务”，把进度的值sendMessage出去，由handleMessage来更新进度条。发现把所有消息发完后，那些消息才开始被处理？求解，谢谢
public class MainActivity extends Activity {

Handler handler = null;
HandlerThread thread = null;
static ProgressBar bar = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Log.d("MainActivity",""+Thread.currentThread().getId());

bar = (ProgressBar)this.findViewById(R.id.progressBar1);

bar.setMax(100);
bar.setProgress(20);

thread = new HandlerThread("anotherThread");
thread.start();

handler = new MyHandler(thread.getLooper());
handler.post(new Runnable(){
public void run(){
Log.d("Thead",""+Thread.currentThread().getId());

for( int i=1; i<=100; i++)
{
handler.sendEmptyMessage(i);
Log.d("SendMessage", ""+i);
try {
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
}

static class MyHandler extends Handler{
public MyHandler(Looper looper) {
super(looper);
}

@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Log.d("HandleMessage",msg.toString() );
bar.setProgress(msg.what);
bar.refreshDrawableState();
}
}
}
消息都发送完了，才开始处理

Answer 1

Post是在主线程里面执行的……

Answer 2

这有异步么？都是在一个消息队列中处理的啊。