Android实现绕球心旋转的引导页效果

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public class MainActivity extends AppCompatActivity {
  //处理手势监听
  private GestureDetector detector;

  private ViewFlipper flipper;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    flipper = (ViewFlipper) findViewById(R.id.vf);

    detector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
      @Override
      public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        if (e1.getX() - e2.getX() > 120.0F) { //从右向左滑动
          flipper.setInAnimation(MainActivity.this, R.anim.tip_left_in);
          flipper.setOutAnimation(MainActivity.this, R.anim.tip_left_out);
          if (flipper.getDisplayedChild() <2) {
            flipper.showNext();
          }
        } else if (e1.getX() - e2.getX() <-120.0F) { //从左向右滑动
          flipper.setInAnimation(MainActivity.this, R.anim.tip_right_in);
          flipper.setOutAnimation(MainActivity.this, R.anim.tip_right_out);
          if (flipper.getDisplayedChild() > 0) {
            flipper.showPrevious();
          }
        }
        return false;
      }
    });
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    if (detector != null) {
      return detector.onTouchEvent(event);
    }
    return super.onTouchEvent(event);
  }
}

detector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
      @Override
      public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        //省略......
        return false;
      }
    });