RecyclerView選擇item滾動到頂部

代碼塊

實現SnappingLinearLayoutManager 繼承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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