android监听网络调用2次,android – RecyclerView Infinite Scroll监听器被调用两次

我有一个RecyclerView,我试图实现无限滚动功能.问题是,OnScrolled方法中if语句中的代码正在执行两次.继承我目前的代码：

public abstract class InfiniteScroll extends RecyclerView.OnScrollListener {

private LinearLayoutManager mLayoutManager;

private int previousTotal = 0;

private boolean loading = true;

private int visibleThreshold = 5;

int firstVisibleItem, visibleItemCount, totalItemCount;

private int current_page = 1;

public InfiniteScroll(LinearLayoutManager layoutManager) {

mLayoutManager = layoutManager;

}

@Override

public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

visibleItemCount = recyclerView.getChildCount();

totalItemCount = mLayoutManager.getItemCount();

firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();

if (loading) {

if (totalItemCount > previousTotal) {

loading = false;

previousTotal = totalItemCount;

}

}

if (!loading && (totalItemCount - visibleItemCount)

<= (firstVisibleItem + visibleThreshold)) {

// End has been reached

// Do something

current_page++;

Log.d("moreitems", "why is this being called twice?");

loadMore(current_page);

loading = true;

}

}

public abstract void loadMore(int current_page);

}

这个代码是作为一个单独的SO问题的答案发布的,其他示例似乎功能类似,但我仍然得到loadMore()方法执行两次到达RecyclerView的底部,我不知道为什么.