ParallaxListView.java 文件源码

@Override
public boolean onTouchEvent(MotionEvent ev) {
    if (ev.getAction() == MotionEvent.ACTION_UP) {
        // 恢复高度
        final ValueAnimator animator = ValueAnimator.ofInt(parallaxImageView.getHeight(), originalHeight);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                Integer animateValue = (Integer) animator.getAnimatedValue();
                // 给 ImageView 设置值
                parallaxImageView.getLayoutParams().height = animateValue;
                parallaxImageView.requestLayout();
            }
        });
        animator.setInterpolator(new OvershootInterpolator()); // 弹性差值器
        animator.setDuration(450);
        animator.start();
    }
    return super.onTouchEvent(ev);
}