Android仿抖音列表效果

public interface OnViewPagerListener { /** * 初始化 */ void onInitComplete(View view); /** * 释放 */ void onPageRelease(boolean isNext, int position, View view); /** * 选中 */ void onPageSelected(int position, boolean isBottom, View view);}

public class PagerLayoutManager extends LinearLayoutManager { private PagerSnapHelper mPagerSnapHelper; private OnViewPagerListener mOnViewPagerListener; private RecyclerView mRecyclerView; private int mDrift;//位移，用来判断移动方向 public PagerLayoutManager(Context context, int orientation) { super(context, orientation, false); init(); } public PagerLayoutManager(Context context, int orientation, boolean reverseLayout) { super(context, orientation, reverseLayout); init(); } private void init() { mPagerSnapHelper = new PagerSnapHelper(); } @Override public void onAttachedToWindow(RecyclerView view) { super.onAttachedToWindow(view); mPagerSnapHelper.attachToRecyclerView(view); this.mRecyclerView = view; mRecyclerView.addOnChildAttachStateChangeListener(mChildAttachStateChangeListener); } @Override public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) { super.onLayoutChildren(recycler, state); } /** * 滑动状态的改变 * 缓慢拖拽-> SCROLL_STATE_DRAGGING * 快速滚动-> SCROLL_STATE_SETTLING * 空闲状态-> SCROLL_STATE_IDLE * * @param state */ @Override public void onScrollStateChanged(int state) { switch (state) {  case RecyclerView.SCROLL_STATE_IDLE:  View viewIdle = mPagerSnapHelper.findSnapView(this);  if (viewIdle != null) {   int positionIdle = getPosition(viewIdle);   if (mOnViewPagerListener != null && getChildCount() == 1) {   mOnViewPagerListener.onPageSelected(positionIdle, positionIdle == getItemCount() - 1, viewIdle);   }  }  break;  case RecyclerView.SCROLL_STATE_DRAGGING:  View viewDrag = mPagerSnapHelper.findSnapView(this);  if (viewDrag != null) {   int positionDrag = getPosition(viewDrag);  }  break;  case RecyclerView.SCROLL_STATE_SETTLING:  View viewSettling = mPagerSnapHelper.findSnapView(this);  if (viewSettling != null) {   int positionSettling = getPosition(viewSettling);  }  break; } } /** * 监听竖直方向的相对偏移量 * * @param dy * @param recycler * @param state * @return */ @Override public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) { this.mDrift = dy; return super.scrollVerticallyBy(dy, recycler, state); } /** * 监听水平方向的相对偏移量 * * @param dx * @param recycler * @param state * @return */ @Override public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) { this.mDrift = dx; return super.scrollHorizontallyBy(dx, recycler, state); } /** * 设置监听 * * @param listener */ public void setOnViewPagerListener(OnViewPagerListener listener) { this.mOnViewPagerListener = listener; } private RecyclerView.OnChildAttachStateChangeListener mChildAttachStateChangeListener = new RecyclerView.OnChildAttachStateChangeListener() { /**  * itemView依赖Window  */ @Override public void onChildViewAttachedToWindow(View view) {  if (mOnViewPagerListener != null && getChildCount() == 1) {  mOnViewPagerListener.onInitComplete(view);  } } /**  *itemView脱离Window  */ @Override public void onChildViewDetachedFromWindow(View view) {  if (mDrift >= 0) {  if (mOnViewPagerListener != null)   mOnViewPagerListener.onPageRelease(true, getPosition(view), view);  } else {  if (mOnViewPagerListener != null)   mOnViewPagerListener.onPageRelease(false, getPosition(view), view);  } } };}

recyclerView = findViewById(R.id.recycler_view); PagerLayoutManager mLayoutManager = new PagerLayoutManager(this, OrientationHelper.VERTICAL); mDatas.addAll(DataUtils.getDatas()); mAdapter = new VideoAdapter(this, mDatas); recyclerView.setLayoutManager(mLayoutManager); recyclerView.setAdapter(mAdapter); mLayoutManager.setOnViewPagerListener(new OnViewPagerListener() {  @Override  public void onInitComplete(View view) {  playVideo(0, view);  }  @Override  public void onPageSelected(int position, boolean isBottom, View view) {  playVideo(position, view);  }  @Override  public void onPageRelease(boolean isNext, int position, View view) {  int index = 0;  if (isNext) {   index = 0;  } else {   index = 1;  }  releaseVideo(view);  } });/** * 播放视频 */ private void playVideo(int position, View view) { if (view != null) {  mVideoView = view.findViewById(R.id.video_view);  mVideoView.start(); } } /** * 停止播放 */ private void releaseVideo(View view) { if (view != null) {  IjkVideoView videoView = view.findViewById(R.id.video_view);  videoView.stopPlayback(); } }