如何在StaggeredGridLayoutManager中实现动态行跨度

Question

我正在尝试在StaggeredGrid中实现自定义Rowspan

如何动态更改StaggeredGridLayout的行距。 @Gabriele Mariotti提出了一个实现

StaggeredGridLayoutManager.LayoutParams layoutParams =StaggeredGridLayoutManager.LayoutParams) viewHolder.itemView.getLayoutParams();
layoutParams.setFullSpan(true);

但我无法让它发挥作用。请建议我实现此目的的一些方法。

以下是我的Adapter Class的代码，它将Recycler Adapter与View holder类一起扩展为嵌套类

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
   LayoutInflater inflater;
Context context;
List<Information> data= Collections.emptyList();
public MyAdapter(Context context,List<Information>data)
{
    inflater= LayoutInflater.from(context);
    this.context=context;
    this.data=data;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view=inflater.inflate(R.layout.custom_layout,parent,false);
    MyViewHolder holder=new MyViewHolder(view);
    return holder;
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    Information current=data.get(position);
    holder.imageView.setImageResource(current.iconid);
    if(position==0) {
        StaggeredGridLayoutManager.LayoutParams layoutParams = (StaggeredGridLayoutManager.LayoutParams) holder.itemView.getLayoutParams();
        layoutParams.setFullSpan(true);
    }

}


@Override
public int getItemCount() {
    return 8;
}

class MyViewHolder extends RecyclerView.ViewHolder{
 ImageView imageView;
    public MyViewHolder(View itemView) {
        super(itemView);
        imageView= (ImageView) itemView.findViewById(R.id.image);

    }
}
}

Answer 1

您可以尝试使用此代码，这将在示例图像中创建第一个项目跨越两列的布局：

        // Create a grid layout with two columns
        GridLayoutManager layoutManager = new GridLayoutManager(this, 2);

        // Create a custom SpanSizeLookup where the first item spans both columns
        layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                return position == 0 ? 2 : 1;
            }
        });

        recyclerView.setLayoutManager(layoutManager);

示例图片中的项目看起来不会错开，所以这会使用常规的2列GridLayoutManager。我不确定如何使用StaggeredGridLayoutManager，但请试一试。