Android Recyclerview表示到达最后一项
我有一个Android Recyclerview表示到达最后一项,android,android-layout,android-recyclerview,Android,Android Layout,Android Recyclerview,我有一个recycleView,当到达最后一个项目时,我需要观察它,但我注意到它总是指示我到达了最后一个项目,即使我还没有滚动。 我的设置回收商代码: newsRecyclerView.setLayoutManager(new LinearLayoutManager(getContext())); newsRecyclerView.setFocusable(false); newsRecyclerView.setNestedScrollingEnabled(false); newsAdapter
recycleView
,当到达最后一个项目时,我需要观察它,但我注意到它总是指示我到达了最后一个项目,即使我还没有滚动。
我的设置回收商代码:
newsRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
newsRecyclerView.setFocusable(false);
newsRecyclerView.setNestedScrollingEnabled(false);
newsAdapter = new NewsAdapter(getContext(), newsDetails, categoryNumber);
newsRecyclerView.setAdapter(newsAdapter);
layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
我的xml代码是:
<android.support.v7.widget.RecyclerView
android:id="@+id/news_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="4dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/news_top_stories_title_text_view" />
这是我放在Util中的代码,可以在任何地方使用
Util.setRecyclerViewLastPositionListner(rv, linearLayoutManager , new UtilitiesV2.OnLastPositionReached() {
@Override
public void onReached() {
// last position reached
}
});
把这个放进去
private boolean userScrolled = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
public interface OnLastPositionReached {
void onReached();
}
public void setRecyclerViewLastPositionListner(RecyclerView rvBooksMockTest, final LinearLayoutManager mLayoutManager, final OnLastPositionReached onLastPositionReached) {
rvBooksMockTest.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
userScrolled = true;
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// Here get the child count, item count and visibleitems
// from layout manager
visibleItemCount = mLayoutManager.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();
// Now check if userScrolled is true and also check if
// the item is end then update recycler view and set
// userScrolled to false
if (userScrolled && (visibleItemCount + pastVisiblesItems) == totalItemCount) {
userScrolled = false;
if (onLastPositionReached != null) onLastPositionReached.onReached();
}
}
});
}
更新
根据您的要求,这里是NestedScrollView底部到达侦听器
nestedScrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
@Override
public void onScrollChanged() {
if (nestedScrollView != null) {
if (nestedScrollView.getChildAt(0).getBottom() <= (nestedScrollView.getHeight() + nestedScrollView.getScrollY())) {
//scroll view is at bottom
} else {
//scroll view is not at bottom
}
}
}
});
nestedScrollView.getViewTreeObserver().addOnScrollChangedListener(新的ViewTreeObserver.OnScrollChangedListener(){
@凌驾
public void onScrollChanged(){
如果(nestedScrollView!=null){
if(nestedScrollView.getChildAt(0.getBottom()感谢为解决方案提供提示的人
因为我在NestedScrollView
中有一个recyclerview
和协调器布局
作为它们的父级
我已经这样解决了我的问题:
public Disposable observeNestedScroll(LoadMoreListener listener) {
return RxNestedScrollView.scrollChangeEvents(nestedScrollView)
.subscribe(
viewScrollChangeEvent -> {
NestedScrollView nestedScrollView =(NestedScrollView) viewScrollChangeEvent.view();
if(nestedScrollView.getChildAt(nestedScrollView.getChildCount() - 1) != null) {
if ((viewScrollChangeEvent.scrollY() >= (nestedScrollView.getChildAt(nestedScrollView.getChildCount() - 1).getMeasuredHeight() - nestedScrollView.getMeasuredHeight())) &&
viewScrollChangeEvent.scrollY() > viewScrollChangeEvent.oldScrollY()) {
listener.onLoadMore();
}
}
});
}
我已经看到很多人对这个问题的回答,我认为他们都没有给出准确的行为作为结果。但是如果你遵循这个方法,我肯定你会得到最好的行为
rvCategories是您的回收视图
categoriesList是传递给适配器的列表
binding.rvCategories.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
val position = (recyclerView.layoutManager as LinearLayoutManager).findLastCompletelyVisibleItemPosition()
if (position + 1 == categoriesList.size) {
// END OF RECYCLERVIEW IS REACHED
} else {
// END OF RECYCLERVIEW IS NOT REACHED
}
}
})
您需要在recyclerview上使用onScrollListener
,然后查找最后一个((LinearLayoutManager)vYourRecycler.getLayoutManager())。FindLastCompleteyVisibleItemPosition()我尝试了它,但它被调用一次当视图创建可能是你的RealReVIEW不可滚动。或者它有1-2个项目。我有一个<代码> ScVIEW视图<代码>,它包含一个“约束布局”,它包含了<代码> CurryReVIEW < /Cord>。所以我应该考虑观察ScLoVIEW。尝试用NeStdScVIEW视图代替ScRelVIEW。您为我提供了一个链接,用于检测nestedScrollView
何时到达末尾