android - 将 RecyclerView 与 StaggeredGridLayoutManager 一起使用时如何避免项目之间的双倍空间？

Question

我将 RecyclerView 与 StaggeredGridLayoutManager 结合使用来创建一个包含两列的列表。但是如何在左列和右列之间设置右边距。我已经使用此代码从顶部制作右边距，但如何解决列之间的双倍空间。

public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
    private int space;

    public SpacesItemDecoration(int space) {
        this.space = space;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        outRect.left = space;
        outRect.right = space;
        outRect.bottom = space;

        // Add top margin only for the first or second item to avoid double space between items
        // Add top margin only for the first or second item to avoid double space between items
        if((parent.getChildCount() > 0 && parent.getChildPosition(view) == 0)
            || (parent.getChildCount() > 1 && parent.getChildPosition(view) == 1))
        outRect.top = space;
}

在 Activity 中:

recyclerView.addItemDecoration(new SpacesItemDecoration(20));

我试过使用 view.getX()，它总是返回 0。

谁能帮帮我？非常感谢!

Answer 1

以下代码将处理 StaggeredGridLayoutManager、GridLayoutManager 和 LinearLayoutManager。

public class SpacesItemDecoration extends RecyclerView.ItemDecoration {

    private int halfSpace;

    public SpacesItemDecoration(int space) {
        this.halfSpace = space / 2;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {

        if (parent.getPaddingLeft() != halfSpace) {
            parent.setPadding(halfSpace, halfSpace, halfSpace, halfSpace);
            parent.setClipToPadding(false);
        }

        outRect.top = halfSpace;
        outRect.bottom = halfSpace;
        outRect.left = halfSpace;
        outRect.right = halfSpace;
    }
}