android - RecyclerView smoothScroolToPositionFromTop()

Question

是否有 ListView 的 smoothScrollToPositionFromTop() 的替代品？对于 RecyclerView？我正在尝试将 ListView 代码迁移到 RecyclerView，但我在任何地方都看不到它的 RecyclerView 版本。

有一种方法叫做 RecyclerView.smoothScrollToPosition() ，但是你不能定义相对于屏幕顶部元素的偏移量(我需要列表滚动到一个位置，并且总是在该位置是列表中的第一个可见子元素时停止)。

Answer 1

要始终将目标位置平滑滚动到顶部，您可以使用像这样的自定义 LinearLayoutManager:

public class CustomLinearLayoutManager extends LinearLayoutManager {
    private Context context;

    public CustomLinearLayoutManager(Context context) {
        super(context);
        this.context = context;
    }

    public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
        super(context, orientation, reverseLayout);
        this.context = context;
    }

    public CustomLinearLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        this.context = context;
    }

    @Override
    public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
        LinearSmoothScroller smoothScroller = new LinearSmoothScroller(context) {

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

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

        smoothScroller.setTargetPosition(position);
        startSmoothScroll(smoothScroller);
    }
}