在 RecyclerView 网格中放置一个不确定的进度条作为页脚 [英] Put an indeterminate progressbar as footer in a RecyclerView grid

问题描述

如何在网格 RecycleView 中为向上滚动加载更多"获取不确定的圆形指示器?

How to get indeterminate circular indicator for "Scroll up to load more" in a grid RecycleView?

模式在那里描述:http://www.google.com/design/spec/components/progress-activity.html#progress-activity-behavior 在两阶段加载"和示例 2:向上滚动以加载更多"示例视频中.

The pattern is described there: http://www.google.com/design/spec/components/progress-activity.html#progress-activity-behavior in "Two-phased loads" and "Example 2: Scroll up to load more" example videos.

我正在尝试使用新的 RecyclerView 来实现这一点，但我找不到一种不太黑客"的方法来做到这一点，首先是因为没有办法添加覆盖整行的页脚在网格中.有什么建议吗?

I'm trying to accomplish this using the new RecyclerView, but I can't find a "not-too-hackish" way to do that, firstly because there is not a way to add a footer that cover a full row in the grid. Any suggestions?

推荐答案

这样做很简单.

解决方案是使用 LinearLayoutManager 和 GridLayoutManager 的相同方法，然后在 LayoutManager 上使用方法 setSpanSizeLookup 像这样:

The solution is to use the same approach of the LinearLayoutManager with a GridLayoutManager and then use the method setSpanSizeLookup on the LayoutManager like this:

mLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            switch(myAdapter.getItemViewType(position)){
                case MyAdapter.VIEW_TYPES.Product:
                    return 1;
                case MyAdapter.VIEW_TYPES.Progress:
                    return 2; //number of columns of the grid
                default:
                    return -1;
            }
        }
    });

这将自动使该项目覆盖网格的一整行(如果该行不完全为空，则该项目进入下一行).

This will automatically make the item cover a full row of the grid (if the row is not totally empty this item goes to the next row).

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