public class LoadingActivity extends Activity

  implements Handler.Callback

{

  private Handler mHandler;

  private Timer mTimer;

  private View mView;

  public boolean handleMessage(Message paramMessage)

  {

    switch (paramMessage.what)

    {

    default:

         return false;

    case 0:

         startActivity(new Intent(this, MenuActivity.class));

         overridePendingTransition(R.anim.left_in, R.anim.left_out);

         finish();

    }

    return false;

  }

/*schedule(TimerTask task, long delay)的注释：Schedules the specified task for execution after the specified delay。大意是在延时delay毫秒后执行task。并没有提到重复执行

 */

  public void onCreate(Bundle paramBundle)

  {

    super.onCreate(paramBundle);

    setContentView(R.layout.loading);

    this.mView = findViewById(R.id.rl_loading);

    this.mHandler = new Handler(this);

    this.mTimer = new Timer();

    this.mTimer.schedule(new TimerTask()

    {

      public void run()

      {

        LoadingActivity.this.mHandler.sendEmptyMessage(0);

      }

    }

    , 3000L);

  }

  public boolean onKeyDown(int paramInt, KeyEvent paramKeyEvent)

  {

    this.mTimer.cancel();

    return super.onKeyDown(paramInt, paramKeyEvent);

  }

  protected void onPause()

  {

    super.onPause();

  }

  protected void onResume()

  {

    super.onResume();

  }

}

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="500" android:fromXDelta="100.0%p" android:toXDelta="0.0" /> </set>

<?xml version="1.0" encoding="utf-8"?>

<set

  xmlns:android="http://schemas.android.com/apk/res/android">

    <translate android:duration="500" android:fromXDelta="0.0" android:toXDelta="-100.0%p" />

</set>