<?xml version="1.0" encoding="utf-8" ?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:gravity="center_horizontal">
    <!--定義一個ViewSwitcher并且制定了文本切換時的動畫效果-->
    <TextSwitcher
      android:id="@+id/textSwitcher"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:inAnimation="@android:anim/slide_in_left"
      android:outAnimation="@android:anim/slide_out_right"
      android:onClick="next">
    </TextSwitcher>
</RelativeLayout>

public class MainActivity extends Activity {
  String[] string = new String[]{
      "我愛高數",
      "我愛概率論",
      "我愛計算機網絡",
      "我愛操作系統"
  };
  TextSwitcher textSwitcher;
  int curStr ;
  Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
      next(null);
    }
  };
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    textSwitcher = (TextSwitcher) findViewById(R.id.textSwitcher);
    textSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
      @Override
      public View makeView() {
        TextView textView = new TextView(MainActivity.this);
        textView.setTextSize(40);
        textView.setTextColor(Color.RED);
        return textView;
      }
    });
    new Thread(){
      @Override
      public void run() {
        while (true){
          Message message = handler.obtainMessage();
          message.obj = 0;
          handler.sendMessage(message);
          try {
            sleep(1000);
          } catch (InterruptedException e) {
            e.printStackTrace();
          }
        }
      }
    }.start();
  }
  private void next(View scource){
    textSwitcher.setText(string[curStr = ( curStr++ % string.length )]);
  }
}