public class MainActivity extends Activity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main); //設置layout布居    // 使用線程異步加載數據，不阻塞界面。    new Thread(){      @Override      public void run() {        // TODO Auto-generated method stub        super.run();        initData();      }          }.start();  }  private final static int MSG_INIT_VIEW = 0xA00;  private final Handler handler = new Handler() {    @Override    public void dispatchMessage(Message msg) {      switch (msg.what) {      case MSG_INIT_VIEW:        initView();        break;      default:        super.dispatchMessage(msg);      }                }      };    private void initData(){    try {      Thread.sleep(5000);// 模擬加載數據需要 5秒    } catch (InterruptedException e) {      // TODO Auto-generated catch block      e.printStackTrace();    }    //數據加載完成，可以更新界面了    handler.sendEmptyMessage(MSG_INIT_VIEW);  }    private void initView(){    //TODO 刷新界面  }}