相关疑难解决方法(0)

我有一个ViewFlipper应该对一个投掷手势作出反应,但事实并非如此.

活动

@Override
public void onCreate(Bundle savedInstanceState) {
    ...
    listView = this.getListView();
    detector = new GestureDetector(this, new FlingGestureListener(listView));
    ...
}

FlingGestureListener

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    int pos = source.pointToPosition(Math.round(e1.getX()), Math.round(e1.getY()));
    View v = source.getChildAt(pos - source.getFirstVisiblePosition());
    System.out.println("fling: x=" + velocityX + " y=" + velocityY);
    try {
        IFlingable flingable = (IFlingable) v;
        if(velocityY > -200 && velocityY < 200) {
            if(velocityX < 0)
                flingable.fling(IFlingable.RIGHT_TO_LEFT);
            else if(velocityX > 0)
                flingable.fling(IFlingable.LEFT_TO_RIGHT);
        }
    } catch(Exception e) …