我有大约 32 条 json 记录,我使用 RecyclerView 来显示它们,并且我已经实现了 OnScrollListener(...)
Question
我启动了一个 Activity,我获取了所有 32 条记录,现在当我滚动时,为什么我再次一次又一次地获取相同的 32 条记录,每当我滚动时,这是我的 OnScrollListener() 实现
public void initializeOnScrollForRecyclerView() {
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
int visibleItemCount = recyclerView.getLayoutManager().getChildCount();
int totalItemCount = recyclerView.getLayoutManager().getItemCount();
int pastVisiblesItems = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();
if (!isLoading) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
isLoading = true;
mPostPresenter.loadPosts(false);
}
}
}
});
}
实现似乎是正确的,但对于一种情况它失败了,请在 dy > 0 时尝试,如下所示(也将其放在 Activity 的 OnCreate 中):
private boolean loading = true;
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy)
{
if (loading) {
if (dy > 0) //check for scroll down
{
visibleItemCount = layoutManager.getChildCount();
totalItemCount = layoutManager.getItemCount();
pastVisiblesItems = layoutManager.findFirstVisibleItemPosition();
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loading = false;
Log.v("...", " Reached Last Item");
loadMoreVideos(searchVideos);
}
}
}
}
});
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