Android实现平滑翻动效果

implements GestureDetector.OnGestureListener

private GestureDetector gestureDetector = null;
private ViewFlipper marsBg;
private int[] imageID = {R.drawable.bg_ast1, R.drawable.bg_main, R.drawable.bg_home};

// 生成GestureDetector对象，用于检测手势事件
        gestureDetector = new GestureDetector(this);
        // 添加用于切换的图片
        for (int value : imageID) {
            // 定义一个ImageView对象
            ImageView image = new ImageView(this);
            image.setImageResource(value);
            // 充满父控件
            image.setScaleType(ImageView.ScaleType.FIT_XY);
            // 添加到viewFlipper中
            marsBg.addView(image, new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
        }

@Override
    public boolean onTouchEvent(MotionEvent event) {
        return this.gestureDetector.onTouchEvent(event);
    }

    @Override
    public boolean onFling(MotionEvent arg0, MotionEvent arg1, float arg2, float arg3) {
        //对手指滑动的距离进行了计算，如果滑动距离大于120像素，就做切换动作，否则不做任何切换动作。
        // 从左向右滑动
        if (arg0.getX() - arg1.getX() > 120) {
            // 添加动画
            this.marsBg.setInAnimation(AnimationUtils.loadAnimation(this,
                    R.anim.push_left_in));
            this.marsBg.setOutAnimation(AnimationUtils.loadAnimation(this,
                    R.anim.push_left_out));
            this.marsBg.showNext();
            
            return true;
        }// 从右向左滑动
        else if (arg0.getX() - arg1.getX() <-120) {
            this.marsBg.setInAnimation(AnimationUtils.loadAnimation(this,
                    R.anim.push_right_in));
            this.marsBg.setOutAnimation(AnimationUtils.loadAnimation(this,
                    R.anim.push_right_out));
            this.marsBg.showPrevious();
           
            return true;
        }

        return true;
    }

    @Override
    public boolean onDown(MotionEvent e) {
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {

    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {

    }