Looper

非主线程

  class LooperThread extends Thread {
      public Handler mHandler;

      public void run() {
          Looper.prepare();

          mHandler = new Handler() {
              public void handleMessage(Message msg) {
                  // process incoming messages here
              }
          };

          Looper.loop();
      }
  }

主线程

  public static final void main(String[] args) {
        // other codes...

        // 创建主线程循环
        Looper.prepareMainLooper();
        if (sMainThreadHandler == null) {
            sMainThreadHandler = new Handler();
        }

        ActivityThread thread = new ActivityThread();
        thread.attach(false);

        // other codes...

        // 进入当前线程(此时是主线程)消息循环
        Looper.loop();

        // other codes...

        thread.detach();
        // other codes...
    }

 

Android 非主线程hanlder

public class TestThread extends Thread {

    private Handler handler;

    private static final String TAG = "Test";

    @Override
    public void run() {
        Log.i(TAG, "run()..");
        Looper.prepare();
        handler = new Handler(Looper.myLooper()) {

            @Override
            public void handleMessage(Message msg) {
                Log.i(TAG, "msg:" + msg.what);
            }

        };

        new Thread() {
            @Override
            public void run() {
                Log.i(TAG, "sub thread run()..");

                try {
                    while (true) {
                        Thread.sleep(4000);                           
                        handler.sendEmptyMessage(1);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

        }.start();

        Looper.loop();
    }
}