如何在RecyclerView的每个网格之间添加分隔符？

Question

我需要在RecyclerView的每个网格之间添加一个分隔符。

RecyclerView recyclerView= (RecyclerView) profileView.findViewById(R.id.profile_recycler_view);
StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layoutManager);
Adapter Adapter = new Adapter(getActivity());
recyclerView.setAdapter(profileAdapter);

请帮我。

Example:

Answer 1

你需要Decoration。 这是一个例子：

public class ItemOffsetDecoration extends RecyclerView.ItemDecoration {
    private int offset;

    public ItemOffsetDecoration(int offset) {
        this.offset = offset;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        outRect.left = offset;
        outRect.right = offset;
        outRect.bottom = offset;
        if(parent.getChildAdapterPosition(view) == 0) {
            outRect.top = offset;
        }
    }
}

在你的活动/片段中

grid.setLayoutManager(new GridLayoutManager(this, 2));
grid.addItemDecoration(new ItemOffsetDecoration(1));

Answer 2

我认为，Jagadesh Seeram谈论的是物品之间的水平分隔，但RecyclerView.ItemDecoration到处都添加了分隔物。

如果你不使用自动滚动到某个项目，你应该这样写：

public class ItemOffsetDecoration extends RecyclerView.ItemDecoration {
private int offset;

public ItemOffsetDecoration(int offset) {
    this.offset = offset;
}

@Override
public void getItemOffsets(Rect outRect, View view,
                           RecyclerView parent, RecyclerView.State state) {
    int bottonIndex;
    if (parent.getAdapter().getItemCount() % 2 == 0){
        bottonIndex = parent.getAdapter().getItemCount() - 2;
    } else {
        bottonIndex = parent.getAdapter().getItemCount() - 1;
    }

    if (parent.getChildAdapterPosition(view) < bottonIndex){
        outRect.bottom = offset;
    } else {
        outRect.bottom = 0;
    }

    if(parent.getChildAdapterPosition(view) > 1 ) {
        outRect.top = offset;
    } else {
        outRect.top = 0;
    }

    if( (parent.getChildAdapterPosition(view) % 2 ) == 0) {
        outRect.right = offset;
        outRect.left = 0;
    } else {
        outRect.right = 0;
        outRect.left = offset;
    }

}