如何从Firebase的底部到顶部获取数据? [英] how to get data from bottom to top from firebase?

问题描述

我试图从下到上获取数据(从上传的最后一个项目到像Instagram这样上传的第一个项目)，但是我做不到.我进行了很多搜索并找到了这个答案

I'm trying to get data from bottom to top (from the last item uploaded to the first item uploaded like Instagram) but I couldn't make this. I searched a lot and found this answer here.

我用firebaseRecyclerAdapter做到了，并且工作正常，但是使用自定义适配器我做不到！

I made it with firebaseRecyclerAdapter and worked fine but with custom Adapter I couldn't do it!

这是我使用的方法:

@Override
    public ItemsRecyclerView getItem(int pos){
        return super.getItem(getCount() - 1 - pos);
    }

推荐答案

您应该做的是反转recyclerview，忘记上面使用的方法.

What you should be doing is reversing the recyclerview, forget about the method that you used above.

并在设置回收者视图时执行此操作:

And do this when you set your recycler view:

LinearLayoutManager manager = new LinearLayoutManager(context);
manager.setReverseLayout(true);
manager.setStackFromEnd(true);
recycler_View.setLayoutManager(manager);

可能的解决方案:

尝试一下:

也许尝试像这样反转您传递给适配器的列表:

Maybe try to reverse the list that you pass to your adapter like this:

//your list
List<model> your_list = new ArrayList()<>;

//before you pass it to the adapter do this
Collections.reverse(your_list);

//now your list is reversed, pass it to the adapter
Adapter adapter = new Adapter (your_list,.....,....);

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