想用tweenAnimation来做

res下新建anim文件夹，添加bottom_slide_in.xml和bottom_slide_out.xml

bottom_slide_in.xml

滑入动画，从右边往左边移动，fromXDelta越大，移动距离越远

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"android:duration="350"><translateandroid:fillAfter="true"android:fromXDelta="70%"android:fromYDelta="0%"android:toXDelta="0%"android:toYDelta="0%" /></set>
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bottom_slide_out.xml

滑出动画，从展示位置往右边移动，toXDelta越大，移动距离越远

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"android:duration="350"><translateandroid:fillAfter="true"android:fromXDelta="0%"android:fromYDelta="0%"android:toXDelta="70%"android:toYDelta="0%" /></set>
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TestActivity.java

boolean scrollStateOld = true; //默认是展示状态mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {@Overridepublic void onScrollStateChanged(RecyclerView recyclerView, int newState) {switch (newState) {case SCROLL_STATE_IDLE: //空闲状态，停止滚动if (!scrollStateOld) {showBottomSVGA(R.anim.bottom_slide_in); //只show一次}break;case SCROLL_STATE_DRAGGING: //手指拖动，滚动状态case SCROLL_STATE_SETTLING: //手指离开，惯性滚动状态if (scrollStateOld) {showBottomSVGA(R.anim.bottom_slide_out); //只hide一次}break;}}@Overridepublic void onScrolled(RecyclerView recyclerView, int dx, int dy) {Log.e("zhen", "onScrolled: dx: " + dx + "  dy: " + dy);}});private void showBottomSVGA(int animationStyle) {Animation animation = AnimationUtils.loadAnimation(getActivity(), animationStyle);animation.setFillAfter(true); //动画结束后，保持动画结束的状态bottomSVGA.startAnimation(animation);scrollStateOld = !scrollStateOld; //取反}
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