RecyclerView smoothScroll滚动到中间位置.安卓

所以，我对smoothScrollToPosition()没问题，但是如何将项目放置在RecyclerView的中心?谢谢！解决方案 是可以的.通过实现RecyclerView.SmoothScroller的方法onTargetFound(View, State, Action)./** * Called when the target position is laid out. This is the last callback SmoothScroller * will receive and it should update the provided {@link Action} to define the scroll * details towards the target view. * @param targetView The view element which render the target position. * @param state Transient state of RecyclerView * @param action Action instance that you should update to define final scroll action * towards the targetView */abstract protected void onTargetFound(View targetView, State state, Action action);特别是在LinearLayoutManager和LinearSmoothScroller中:public class CenterLayoutManager extends LinearLayoutManager { public CenterLayoutManager(Context context) { super(context); } public CenterLayoutManager(Context context, int orientation, boolean reverseLayout) { super(context, orientation, reverseLayout); } public CenterLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } @Override public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) { RecyclerView.SmoothScroller smoothScroller = new CenterSmoothScroller(recyclerView.getContext()); smoothScroller.setTargetPosition(position); startSmoothScroll(smoothScroller); } private static class CenterSmoothScroller extends LinearSmoothScroller { CenterSmoothScroller(Context context) { super(context); } @Override public int calculateDtToFit(int viewStart, int viewEnd, int boxStart, int boxEnd, int snapPreference) { return (boxStart + (boxEnd - boxStart) / 2) - (viewStart + (viewEnd - viewStart) / 2); } }}I am using a horizontal layout manager for my RecyclerView.I need to make RecyclerView in the next way: when click on some item - make smoothScrool to that position and put that item in the center of RecyclerView (if it possible, for example, 10 item from 20).So, I have no problem with smoothScrollToPosition(), but how to put item than in the center of RecyclerView???Thanks! 解决方案 Yes it's possible.By implementing RecyclerView.SmoothScroller's method onTargetFound(View, State, Action)./** * Called when the target position is laid out. This is the last callback SmoothScroller * will receive and it should update the provided {@link Action} to define the scroll * details towards the target view. * @param targetView The view element which render the target position. * @param state Transient state of RecyclerView * @param action Action instance that you should update to define final scroll action * towards the targetView */abstract protected void onTargetFound(View targetView, State state, Action action);Specifically in LinearLayoutManager with LinearSmoothScroller:public class CenterLayoutManager extends LinearLayoutManager { public CenterLayoutManager(Context context) { super(context); } public CenterLayoutManager(Context context, int orientation, boolean reverseLayout) { super(context, orientation, reverseLayout); } public CenterLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } @Override public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) { RecyclerView.SmoothScroller smoothScroller = new CenterSmoothScroller(recyclerView.getContext()); smoothScroller.setTargetPosition(position); startSmoothScroll(smoothScroller); } private static class CenterSmoothScroller extends LinearSmoothScroller { CenterSmoothScroller(Context context) { super(context); } @Override public int calculateDtToFit(int viewStart, int viewEnd, int boxStart, int boxEnd, int snapPreference) { return (boxStart + (boxEnd - boxStart) / 2) - (viewStart + (viewEnd - viewStart) / 2); } }} 这篇关于RecyclerView smoothScroll滚动到中间位置.安卓的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！