How to use Android to imitate Douyin sliding layout up and down

This article will explain in detail how to use Android to imitate the sliding layout up and down Douyin. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

The details are as follows

Using RecyclerView+PagerSnapHelper to implement

Public class DouYinLayoutManager extends LinearLayoutManager implements RecyclerView.OnChildAttachStateChangeListener {/ / judge whether to slide up or down private int mDrift; private OnViewPagerListener onViewPagerListener; / / top, private PagerSnapHelper pagerSnapHelper; public OnViewPagerListener getOnViewPagerListener () {return onViewPagerListener;} public void setOnViewPagerListener (OnViewPagerListener onViewPagerListener) {this.onViewPagerListener = onViewPagerListener;} public DouYinLayoutManager (Context context) {super (context);} public DouYinLayoutManager (Context context, int orientation, boolean reverseLayout) {super (context, orientation, reverseLayout); pagerSnapHelper = new PagerSnapHelper () } / * when manager is fully added to recycleview, it will be called * @ param view * / @ Override public void onAttachedToWindow (RecyclerView view) {view.addOnChildAttachStateChangeListener (this); pagerSnapHelper.attachToRecyclerView (view); super.onAttachedToWindow (view);} @ Override public boolean canScrollVertically () {return super.canScrollVertically ();} @ Override public int scrollVerticallyBy (int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {mDrift = dy; return super.scrollVerticallyBy (dy, recycler, state) } @ Override public void onChildViewAttachedToWindow (@ NonNull View view) {if (mDrift > 0) {/ / upward slide if (onViewPagerListener! = null & & Math.abs (mDrift) = = view.getHeight ()) {onViewPagerListener.onPageSelected (false,view);}} else {/ / slide if (onViewPagerListener! = null & Math.abs (mDrift) = = view.getHeight ()) {onViewPagerListener.onPageSelected (true,view) } @ Override public void onChildViewDetachedFromWindow (@ NonNull View view) {if (mDrift > = 0) {/ / upward slide if (onViewPagerListener! = null) {onViewPagerListener.onPageRelease (true,view);}} else {/ / slide if (onViewPagerListener! = null) {onViewPagerListener.onPageRelease (false,view);} @ Override public void onScrollStateChanged (int state) {switch (state) {case RecyclerView.SCROLL_STATE_IDLE: / / currently displayed item View snapView = pagerSnapHelper.findSnapView (this) If (onViewPagerListener! = null) {onViewPagerListener.onPageSelected (false,snapView);} break;} super.onScrollStateChanged (state);}}

RecyclerView.setLayoutManager () is fine.

RecyclerView = findViewById (R.id.recyclerView_dy); douYinLayoutManager = new DouYinLayoutManager (this, OrientationHelper.VERTICAL,false); recyclerView.setLayoutManager (douYinLayoutManager); recyclerView.setAdapter (new MyAdapter ()); douYinLayoutManager.setOnViewPagerListener (new OnViewPagerListener () {@ Override public void onPageRelease (boolean isNest, View position) {releaseVideo (position);} @ Override public void onPageSelected (boolean isButten, View position) {playVideo (position);}});}

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