RecyclerView选择item滚动到顶部

代码块

实现SnappingLinearLayoutManager 继承LinearLayoutManager 。

public class SnappingLinearLayoutManager extends LinearLayoutManager {

public SnappingLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}

@Override
public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state,
int position) {
RecyclerView.SmoothScroller smoothScroller = new TopSnappedSmoothScroller(recyclerView.getContext());
smoothScroller.setTargetPosition(position);
startSmoothScroll(smoothScroller);
}

private class TopSnappedSmoothScroller extends LinearSmoothScroller {
public TopSnappedSmoothScroller(Context context) {
super(context);

}

@Override
public PointF computeScrollVectorForPosition(int targetPosition) {
return SnappingLinearLayoutManager.this
.computeScrollVectorForPosition(targetPosition);
}

@Override
protected int getVerticalSnapPreference() {
return SNAP_TO_START;
}
}

}

“`

使用方法

1.Rv.setLayoutManager(new SnappingLinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false))

2.Rv.smoothScrollToPosition(i);

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