将双重手势限制为只需一次双击(Limit doubletap gesture to just one double tap)

将双重手势限制为只需一次双击(Limit doubletap gesture to just one double tap)

我已经实现了这个onDoubleTap方法，它非常简单，它只是弹出一张照片，我喜欢的是，如果我做doubleTap它只是一次动画，当我再次做它时，它不会再做它了

这是我的代码

@Override public boolean onDoubleTap(MotionEvent motionEvent) { animateHeart(myImageView); return false; } public void animateHeart(final ImageView view) { ScaleAnimation scaleAnimation = new ScaleAnimation(0.0f, 1.0f, 0.0f, 1.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); prepareAnimation(scaleAnimation); AlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 3.0f); prepareAnimation(alphaAnimation); AnimationSet animation = new AnimationSet(true); animation.addAnimation(alphaAnimation); animation.addAnimation(scaleAnimation); animation.setDuration(400); animation.setFillAfter(true); view.startAnimation(animation); } private Animation prepareAnimation(Animation animation){ animation.setRepeatCount(1); animation.setRepeatMode(Animation.REVERSE); return animation; }

谢谢

I have this onDoubleTap method implemented, it is really simple, it just pops up a photo, what I like is that if I do the doubleTap it just animate it one time and when I do it again it dosn't do it anymore

Here is my code

@Override public boolean onDoubleTap(MotionEvent motionEvent) { animateHeart(myImageView); return false; } public void animateHeart(final ImageView view) { ScaleAnimation scaleAnimation = new ScaleAnimation(0.0f, 1.0f, 0.0f, 1.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); prepareAnimation(scaleAnimation); AlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 3.0f); prepareAnimation(alphaAnimation); AnimationSet animation = new AnimationSet(true); animation.addAnimation(alphaAnimation); animation.addAnimation(scaleAnimation); animation.setDuration(400); animation.setFillAfter(true); view.startAnimation(animation); } private Animation prepareAnimation(Animation animation){ animation.setRepeatCount(1); animation.setRepeatMode(Animation.REVERSE); return animation; }

Thanks

最满意答案

首先，如果事件已消耗，则需要返回true 。 那么，为什么你没有一个国旗来检查你是否已经处理了它？

private boolean isConsumed; @Override public boolean onDoubleTap(MotionEvent motionEvent) { if (!isConsumed) { animateHeart(myImageView); isConsumed = true; } return true; }

First of all, you need to return true if the event is consumed. Then, why don't you have a flag to check if you already handled it?

private boolean isConsumed; @Override public boolean onDoubleTap(MotionEvent motionEvent) { if (!isConsumed) { animateHeart(myImageView); isConsumed = true; } return true; }