handler

public Handler mHandler = new Handler() {
    public void handleMessage(Message msg) {
        switch (msg.what) {
            case 1:
               //ui主界面做處理

                break;
            default:
                break;
        }
        super.handleMessage(msg);
    }
};

 public void test(View v) {  
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {

                //自己代碼。耗時操作。通知ui主線程
                Message message = new Message();
                message.what = 1;
                mHandler.sendMessage(message);
            }
        });
        thread.start();

    }