Recyclerview - 重叠项目从下到上

Question

我为这样的项目设置了负余量: -

ItemDecoration.java

public class ItemDecorator extends RecyclerView.ItemDecoration {
    private final int mSpace;

    public ItemDecorator(int space) {
        this.mSpace = space;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        int position = parent.getChildAdapterPosition(view);
        if (position != 0)
            outRect.top = mSpace;
    }
}

MainActivity.java

recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.addItemDecoration(new ItemDecorator(-80));

这会导致顶部项目在顶部项目重叠之后堆叠最低项目和下一个项目.我希望顶级项目与下一个项目重叠,依此类推.

目前来看

必需的视图

Answer 1

尝试这种方式并反向渲染您的回收者视图.

LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setReverseLayout(true);
        layoutManager.setStackFromEnd(true);
        recyclerView.setLayoutManager(layoutManager);

这是GitHub Link的工作示例

Answer 2

截至 2020 年，有新的接口ChildDrawingOrderCallback。它定义了回收器视图中绘制元素的顺序。可以这样使用：

class BackwardsDrawingOrderCallback : RecyclerView.ChildDrawingOrderCallback {
    override fun onGetChildDrawingOrder(childCount: Int, i: Int) = childCount - i - 1
}

进而

recyclerView.setChildDrawingOrderCallback(BackwardsDrawingOrderCallback())

因此，不再需要设置反向顺序和堆栈。