如何实现使用StaggeredLayoutManager无尽的滚动 [英] How to implement Endless scrolling using StaggeredLayoutManager

问题描述

我已经尝试过实施LinearLayoutManager无尽的滚动，它是成功的，并试图复制LinearLayoutManager实施StaggeredGridLayoutManager，但它不工作。

I already tried to implement the endless scrolling for LinearLayoutManager and it is successful and tried to copy the LinearLayoutManager implementation to StaggeredGridLayoutManager but it doesn't work.

我只是想获得firstVisibleItem。

I just want to get the firstVisibleItem.

在LinearLayoutManager：

in LinearLayoutManager :

int firstVisibleItem = linearLayoutManager.findFirstVisibleItemPosition(int);

但在StaggeredGridLayoutManager是：

but in StaggeredGridLayoutManager is :

int firstVisibleItem = staggeredGridLayoutManager.findFirstVisibleItemPositions(int[])

如何使用获得firstVisibleItem（INT）不（INT []）？

How to get the firstVisibleItem using (int) not (int[])?

有没有什么好的方法/执行这个呢？

Is there any good approach/implementation about this?

在此先感谢。

推荐答案

我得到它的工作：

您可以使用在StaggeredGridLayoutManager两种方法之一：

You can use one of two methods in the StaggeredGridLayoutManager:

1. mLayoutManager.findFirstVisibleItemPositions


2. mLayoutManager.findFirstCompletelyVisibleItemPositions

传递，将得到与位置初始化一个空的int数组，并使用一个适合于你。

Pass an empty int array that will get initialized with the positions and use the one that makes sense for you.

private boolean loading = true;
private int pastVisibleItems, visibleItemCount, totalItemCount;

mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener({
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

        visibleItemCount = mLayoutManager.getChildCount();
        totalItemCount = mLayoutManager.getItemCount();
        int[] firstVisibleItems = null;
        firstVisibleItems = mLayoutManager.findFirstVisibleItemPositions(firstVisibleItems);
        if(firstVisibleItems != null && firstVisibleItems.length > 0) {
            pastVisibleItems = firstVisibleItems[0];
        }

        if (loading) {
            if ((visibleItemCount + pastVisibleItems) >= totalItemCount) {
                loading = false;
                Log.d("tag", "LOAD NEXT ITEM");
            }
        }
    }
});

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