Android listview item删除动画和item排序动画

我明明是正着录得,但截取gif动画就变成倒着了,大家凑活看吧.

今天讲的就是上面动画所演示的,listview删除item和上下item进行交换的动画.我们有时候listview会执行删除item的操作,但是如果没有动画就会显得很突兀,用户体验非常不好,因此,我们删除item的时候可以加个动画效果,这样看上去就顺眼多了.不多说,上代码

首先,我们看一下删除动画:

private AnimatorSet getDeleteAnimation(int position){ // 存储所有的Animator，利用AnimatorSet直接播放 ArrayList<Animator> animators = new ArrayList<Animator>(); //获取显示的一个view的position int firstVisiblePosition = mListView.getFirstVisiblePosition(); View deleteView = mListView.getChildAt(position - firstVisiblePosition); int viewHeight = deleteView.getHeight(); int viewWidth = deleteView.getWidth(); //平移动画 ObjectAnimator translationXAnimator = ObjectAnimator.ofFloat(deleteView, "translationX", viewWidth); translationXAnimator.setDuration(500); animators.add(translationXAnimator); //透明动画 ObjectAnimator alphaAnimator = ObjectAnimator.ofFloat(deleteView, "alpha", 1, 0); alphaAnimator.setDuration(500); animators.add(alphaAnimator); int delay = 500; int firstViewToMove = position + 1; for (int i=firstViewToMove;i < mListView.getChildCount(); ++i){ View viewToMove = mListView.getChildAt(i); ObjectAnimator moveAnimator = ObjectAnimator.ofFloat(viewToMove, "translationY", 0, - viewHeight); moveAnimator.setInterpolator(new AccelerateDecelerateInterpolator()); moveAnimator.setStartDelay(delay); delay += 100; animators.add(moveAnimator); } //动画集合 AnimatorSet animationSet = new AnimatorSet(); animationSet.playTogether(animators); return animationSet; }

如果你比较熟悉属性动画,那么上面代码没什么你应该能看得懂,如果不明白的话,你也可以去学学关于属性动画的文章,不需要太深入,稍微了解你就能看的懂了.当我们进行删除操作的时候,就可以启动动画了

viewHolder.delete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { AnimatorSet animatorSet = getDeleteAnimation(position); animatorSet.start(); animatorSet.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { remove(position); // 动画结束后，恢复ListView所有子View的属性 for (int i=0; i<mListView.getChildCount() ;++i){ View v = mListView.getChildAt(i); v.setAlpha(1f); v.setTranslationY(0); v.setTranslationX(0); } } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } }); } });

remove方法:

private void remove(int position){ if (position < mModelLists.size()){ mModelLists.remove(position); } this.notifyDataSetChanged(); }

这样就可以实现item删除动画

接下来,我们要实现item移动动画,动画代码:

private AnimatorSet changePositionAnimation(int position, int type){ // 存储所有的Animator，利用AnimatorSet直接播放 ArrayList<Animator> animators = new ArrayList<Animator>(); //获取显示的一个view的position int firstVisiblePosition = mListView.getFirstVisiblePosition(); View moveView = mListView.getChildAt(position - firstVisiblePosition); int viewHeight = moveView.getHeight(); int viewWidth = moveView.getWidth(); AnimatorSet animatorSet = new AnimatorSet(); if (type == 1){//向下移动 View upView = mListView.getChildAt(position - firstVisiblePosition + 1); ObjectAnimator objectAnimatorUp = ObjectAnimator.ofFloat(upView, "translationY", -viewHeight); ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(moveView, "translationY", viewHeight); animators.add(objectAnimator); animators.add(objectAnimatorUp); }else if (type == 2){//向上移动 View downView = mListView.getChildAt(position - firstVisiblePosition - 1); ObjectAnimator objectAnimatorDow = ObjectAnimator.ofFloat(downView, "translationY", viewHeight); ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(moveView, "translationY", -viewHeight); animators.add(objectAnimator); animators.add(objectAnimatorDow); } animatorSet.setDuration(300); animatorSet.playTogether(animators); return animatorSet; }

向上移动点击事件:

viewHolder.takeUp.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { AnimatorSet animatorSet = changePositionAnimation(position, 2); animatorSet.start(); animatorSet.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { remove(position); insertItem(albumImage, position - 1); for (int i=0; i<mListView.getChildCount() ;++i){ View v = mListView.getChildAt(i); v.setTranslationY(0); } } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } }); } });

向下移动点击事件:

//下一个 viewHolder.takeDown.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { AnimatorSet animatorSet = changePositionAnimation(position, 1); animatorSet.start(); animatorSet.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { remove(position); insertItem(albumImage, position + 1); for (int i=0; i<mListView.getChildCount() ;++i){ View v = mListView.getChildAt(i); v.setTranslationY(0); } } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } }); } });

insertItem方法:

private void insertNext(HexAlbumImage image, int to){ mModelLists.add(to, image); this.notifyDataSetChanged(); }

通过上述代码,我们就可以实现item动画了,如果有什么问题可以问我哦