参考：
实现的效果如下：
实现视频的播放和停止播放
/**
* 停止播放
*/
private void releaseVideo(View itemView) {
final VideoView videoView = itemView.findViewById(R.id.video_view);
final ImageView imgThumb = itemView.findViewById(R.id.img_thumb);
final ImageView imgPlay = itemView.findViewById(R.id.img_play);
videoView.stopPlayback();
imgThumb.animate().alpha(1).start();
imgPlay.animate().alpha(0f).start();
}
/**
* 开始播放
*/
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
private void playVideo(View itemView) {
final VideoView videoView = itemView.findViewById(R.id.video_view);
final ImageView imgPlay = itemView.findViewById(R.id.img_play);
final ImageView imgThumb = itemView.findViewById(R.id.img_thumb);
final RelativeLayout rootView = itemView.findViewById(R.id.root_view);
final MediaPlayer[] mediaPlayer = new MediaPlayer[1];
videoView.start();
videoView.setOnInfoListener(new MediaPlayer.OnInfoListener() {
@Override
public boolean onInfo(MediaPlayer mp, int what, int extra) {
mediaPlayer[0] = mp;
mp.setLooping(true);
imgThumb.animate().alpha(0).setDuration(200).start();
return false;
}
});
videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
}
});
imgPlay.setOnClickListener(new View.OnClickListener() {
boolean isPlaying = true;
@Override
public void onClick(View v) {
if (videoView.isPlaying()) {
imgPlay.animate().alpha(1f).start();
videoView.pause();
isPlaying = false;
} else {
imgPlay.animate().alpha(0f).start();
videoView.start();
isPlaying = true;
}
}
});
}
监听每个Item的移出和移进
自定义LinearLayoutManager，并实现RecyclerView.OnChildAttachStateChangeListener接口。
OnChildAttachStateChangeListener接口源码如下：
public interface OnChildAttachStateChangeListener {
/**
* Called when a view is attached to the RecyclerView.
*
* @param view The View which is attached to the RecyclerView
*/
void onChildViewAttachedToWindow(@NonNull View view);
/**
* Called when a view is detached from RecyclerView.
*
* @param view The View which is being detached from the RecyclerView
*/
void onChildViewDetachedFromWindow(@NonNull View view);
}
- onChildViewAttachedToWindow方法是将Item添加进来的时候调用；
- onChildViewDetachedFromWindow方法是将Item移除出去的时候调用。
需要在onAttachedToWindow方法中调用addOnChildAttachStateChangeListener方法。
scrollVerticallyBy方法中实时获取垂直滑动的距离值；
自定义的MyLayoutManager代码如下：
public class MyLayoutManager extends LinearLayoutManager implements RecyclerView.OnChildAttachStateChangeListener {
//根据这个参数来判断当前是上滑 还是下滑
private int mDrift;
//传进来的监听接口类
private OnViewPagerListener onViewPagerListener;
public MyLayoutManager(Context context) {
super(context);
}
public MyLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
/**
* 当MyLayoutManager完全放入到RecyclerView中的时候会被调用
*/
@Override
public void onAttachedToWindow(RecyclerView view) {
view.addOnChildAttachStateChangeListener(this);
super.onAttachedToWindow(view);
}
@Override
public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {
mDrift = dy;
return super.scrollVerticallyBy(dy, recycler, state);
}
@Override
public boolean canScrollVertically() {
return true;
}
/**
* 将Item添加进来的时候 调用这个方法
*/
@Override
public void onChildViewAttachedToWindow(@NonNull View view) {
if(mDrift >0){
//向上滑
if(onViewPagerListener !=null){
//如果是向上滑动的时候 就选中当前itemView下一个item
onViewPagerListener.onPageSelected(view);
}
}else{
//向下滑
if(onViewPagerListener !=null){
//如果是向上滑动的时候 就选中当前itemView下一个item
onViewPagerListener.onPageSelected(view);
}
}
}
/**
* 将Item移除出去的时候 调用这个方法
*/
@Override
public void onChildViewDetachedFromWindow(@NonNull View view) {
Log.e("EEEEEEEEE","22222222222222222");
if(mDrift >=0){
//向上滑
if(onViewPagerListener !=null){
onViewPagerListener.onPageRelease(view);
}
}else{
//向下滑
if(onViewPagerListener !=null){
onViewPagerListener.onPageRelease(view);
}
}
}
public void setOnViewPagerListener(OnViewPagerListener onViewPagerListener) {
this.onViewPagerListener = onViewPagerListener;
}
}
在Activity中初始化接口，releaseVideo方法表示停止播放视频，playVideo方法表示开始播放视频。
private void initListener() {
myLayoutManager.setOnViewPagerListener(new OnViewPagerListener() {
@Override
public void onPageRelease(View itemView) {
releaseVideo(itemView);
}
@Override
public void onPageSelected(View itemView) {
playVideo(itemView);
}
});
}
吸低和吸顶
使用PagerSnapHelper，如下：
//解决吸顶或者洗低的对象
private PagerSnapHelper pagerSnapHelper;
public MyLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
pagerSnapHelper = new PagerSnapHelper();
}
/**
* 当MyLayoutManager完全放入到RecyclerView中的时候会被调用
*/
@Override
public void onAttachedToWindow(RecyclerView view) {
view.addOnChildAttachStateChangeListener(this);
pagerSnapHelper.attachToRecyclerView(view);
super.onAttachedToWindow(view);
}
myLayoutManager = new MyLayoutManager(this, OrientationHelper.VERTICAL, false);
解决滑动后播放问题，当滑动停止后播放视频
/**
* 监听滑动的状态
*/
@Override
public void onScrollStateChanged(int state) {
switch (state) {
case RecyclerView.SCROLL_STATE_IDLE:
//现在拿到的就是当前显示的这个item
View snapView = pagerSnapHelper.findSnapView(this);
assert snapView != null;
if (onViewPagerListener != null) {
onViewPagerListener.onPageSelected(snapView);
}
break;
}
super.onScrollStateChanged(state);
}
Github：
https://github.com/345166018/AndroidUI/tree/master/HxDouYin
