如何检测RecyclerView何时滚动到最顶部位置
如何检测RecyclerView何时滚动到最顶部位置
提问于 2017-01-17 14:30:59
我有上面的RecyclerView，我有一个高度大于255像素的AppBarLayout。当用户滚动RecyclerView时，AppBarLayout有一个fling问题。为了避免这种情况，我决定手动扩展AppBarLayout。我的RecyclerView由跨度为3的GridLayoutManager组成。我使用以下代码来监听RecyclerView top reach
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
int firstVisiblePosition = ((LinearLayoutManager)recyclerView.getLayoutManager()).findFirstCompletelyVisibleItemPosition();
if (firstVisiblePosition == 0) {
appBarLayout.setExpanded(true, true);
}
}
}
});回答 2
Stack Overflow用户
发布于 2017-01-17 15:11:34
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int firstVisibleItem = gridLayoutManager.findFirstCompletelyVisibleItemPosition();
if(firstVisibleItem == 0){
// your code
}
}
});Stack Overflow用户
发布于 2019-12-13 15:36:30
这个答案会对你有所帮助。你的真心
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
totalItemCount = layoutManager.getItemCount();
visibleItemCount = layoutManager.getChildCount();
pastVisiblesItems = layoutManager.findFirstVisibleItemPosition();
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount ) {
Log.d(TAG, "scroll down");
}
else{
Log.d(TAG, "scroll up");
}
}
});页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/41690399
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