Android 滚动时如何设置recyclerview项目的动画？
我正在将Android 滚动时如何设置recyclerview项目的动画？,android,animation,android-recyclerview,onscrolllistener,Android,Animation,Android Recyclerview,Onscrolllistener,我正在将RecyclerView与自定义的RecyclerViewScrollListener一起使用。 我想在向下滚动时更改RecyclerView项目高度，在向上滚动时返回原始高度 我已经在同一个侦听器中设置底部栏的动画，但我不知道如何在RecyclerView中设置每个项的动画。我试过使用for循环，但我认为这不是正确的想法 public abstract class RecyclerViewOnScrollListener extends RecyclerView.OnScrollLis
RecyclerViewRecyclerViewScrollListenerRecyclerViewpublic abstract class RecyclerViewOnScrollListener extends RecyclerView.OnScrollListener {
private LinearLayout bottomBarContainer;
private boolean animateItems = false;
CardStackLayoutManager cardStackLayoutManager;
public RecyclerViewOnScrollListener(LinearLayout bottomBarContainer) {
this.bottomBarContainer = bottomBarContainer;
}
public RecyclerViewOnScrollListener(LinearLayout bottomBarContainer, boolean animateItems, CardStackLayoutManager cardStackLayoutManager) {
this.bottomBarContainer = bottomBarContainer;
this.animateItems = animateItems;
this.cardStackLayoutManager = cardStackLayoutManager;
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (bottomBarContainer==null || dy==0 ) {
return;
}
long ANIMATION_DURATION = 200L;
if (dy>0) { // Scrolling to bottom
if (mIsScrollDirectionLocked && mScrollingDirection!=0) return;
if (bottomBarContainer.getVisibility()== View.GONE || mIsAnimatingOff) {
return;
} else {
for(int i = 0;i < cardStackLayoutManager.getChildCount();i++)
{
View view = cardStackLayoutManager.getChildAt(i);
ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(view,"y",0f,200f);
objectAnimator.setDuration(150);
objectAnimator.start();
}
mScrollingDirection = SCROLLING_DOWN;
mIsAnimatingOff = !mIsAnimatingOff;
ViewCompat.setTranslationY(bottomBarContainer, 0F);
ViewCompat.animate(bottomBarContainer)
.translationY(bottomBarContainer.getHeight())
.setDuration(ANIMATION_DURATION)
.setListener(new ViewPropertyAnimatorListenerAdapter() {
@Override
public void onAnimationEnd(View view) {
mIsAnimatingOff = !mIsAnimatingOff;
bottomBarContainer.setVisibility(View.GONE);
}
}).start();
}
} else { // Scrolling to top
if (mIsScrollDirectionLocked && mScrollingDirection!=0) return;
if (bottomBarContainer.getVisibility()!=View.VISIBLE && !mIsAnimatingOn) {
mScrollingDirection = SCROLLING_UP;
mIsAnimatingOn = !mIsAnimatingOn;
bottomBarContainer.setVisibility(View.VISIBLE);
for(int i = 0;i < cardStackLayoutManager.getChildCount();i++)
{
View view = cardStackLayoutManager.getChildAt(i);
ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(view,"y",200f,0f);
objectAnimator.setDuration(150);
objectAnimator.start();
}
ViewCompat.setTranslationY(bottomBarContainer, bottomBarContainer.getHeight());
ViewCompat.animate(bottomBarContainer)
.translationY(0F)
.setDuration(ANIMATION_DURATION)
.setListener(new ViewPropertyAnimatorListenerAdapter() {
@Override
public void onAnimationEnd(View view) {
mIsAnimatingOn = !mIsAnimatingOn;
}
}).start();
}
}
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (!mIsScrollDirectionLocked) return;
switch (newState) {
case RecyclerView.SCROLL_STATE_IDLE:
mScrollingDirection = 0;
break;
default:
break;
}
}
private static final int SCROLLING_UP = 1;
private static final int SCROLLING_DOWN = 2;
private int mScrollingDirection = 0;
private boolean mIsScrollDirectionLocked = false;
private boolean mIsAnimatingOff = false;
private boolean mIsAnimatingOn = false;
}
公共抽象类RecycleWebOnScrollListener扩展了RecycleView.OnScrollListener{
专用线路布置箱；
私有布尔animateItems=false；
CardStackLayoutManager CardStackLayoutManager；
公共RecycleServiceOnScrollListener（LinearLayout bottomBarContainer）{
this.bottomBarContainer=bottomBarContainer；
}
public RecycleServiceOnScrollListener（LinearLayout bottomBarContainer、boolean animateItems、CardStackLayoutManager CardStackLayoutManager）{
this.bottomBarContainer=bottomBarContainer；
this.animateItems=animateItems；
this.cardStackLayoutManager=cardStackLayoutManager；
}
@凌驾
已填空的公共空间（RecyclerView RecyclerView、int dx、int dy）{
super.onScrolled（recyclerView、dx、dy）；
if（bottomBarContainer==null | | dy==0）{
返回；
}
长动画持续时间=200L；
如果（dy>0）{//滚动到底部
如果（mIsScrollDirectionLocked&&mScrollingDirection！=0）返回；
if（bottomBarContainer.getVisibility（）==View.GONE | | mIsAnimatingOff）{
返回；
}否则{
对于（int i=0；i转换视图的动画，如下所示：
private void setAnimation(View viewToAnimate,int position) {
if (position > lastPosition) {
lastPosition = position;
Animation animation = AnimationUtils.loadAnimation(activity, R.anim.anim_content);
viewToAnimate.startAnimation(animation);
}
}
在适配器的onBindViewHolder
方法中调用动画方法：
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
// Do your initialization
setAnimation(holder.convertView, position);
}
下面是动画：（anime_content.xml）
此示例将从下至上设置上次充气回收器视图行的动画。您可以随时更改动画
祝你好运 嗨，谢谢你的回答。此实现仅在recyclerView项第一次膨胀时才起作用。我想要一些动画响应onScroll..比如向下滚动时增加高度，向上滚动时减少是的，这是一个用于RecycleView的行膨胀动画实现。我正在寻找在滚动RecycleService软件时为膨胀视图设置动画的东西。你找到解决方案了吗？
<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromYDelta="25%p"
android:toYDelta="0%p"
android:duration="300"
android:interpolator="@android:anim/decelerate_interpolator" />