RecyclerView 在 NestedScrollView 中使用时不会回收视图 [英] RecyclerView does not Recycling Views when use it inside NestedScrollView
问题描述
我在 NestedScrollView 中使用了 RecyclerView.我还为 recyclerview
I'm using RecyclerView inside NestedScrollView. Also i set setNestedScrollingEnabled to false for recyclerview
支持较低的API
ViewCompat.setNestedScrollingEnabled(mRecyclerView, false);
现在！当用户滚动视图时，一切似乎都还好，但是！！！recyclerview 中的视图不回收！！！并且堆大小迅速增长！！
Now! When user scrolled the view every thing seems okay, but!!! views in recyclerview does not recycled!!! and Heap size grows swiftly!!
更新:RecyclerView 布局管理器是 StaggeredLayoutManager
Update:
RecyclerView layout manager is StaggeredLayoutManager
fragment_profile.xml:
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" >
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/profileSwipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<!-- RecyclerView and NestedScrollView -->
<include layout="@layout/fragment_profile_details" />
</android.support.v4.widget.SwipeRefreshLayout>
</android.support.design.widget.CoordinatorLayout>
fragment_profile_details.xml:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/rootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:orientation="vertical" >
<android.support.v4.widget.NestedScrollView
android:id="@+id/nested_scrollbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:fillViewport="true"
android:scrollbars="none" >
<LinearLayout
android:id="@+id/nested_scrollbar_linear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:descendantFocusability="blocksDescendants"
android:orientation="vertical" >
<android.support.v7.widget.CardView
android:id="@+id/profileCardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardBackgroundColor="@color/card_backgroind"
app:cardCornerRadius="0dp"
app:cardElevation="0dp" >
<!-- Profile related stuff like avatar and etc. --->
</android.support.v7.widget.CardView>
<android.support.v7.widget.RecyclerView
android:id="@+id/list_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="@dimen/four"
android:layout_marginEnd="@dimen/four"
android:layout_marginLeft="@dimen/four"
android:layout_marginRight="@dimen/four"
android:layout_marginStart="@dimen/four"
android:layout_marginTop="@dimen/four"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:clipToPadding="false" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>
ProfileFragment.java:
mAdapter = new MainAdapter(getActivity(), glide, Data);
listView = (RecyclerView) view.findViewById(R.id.list_view);
ViewCompat.setNestedScrollingEnabled(listView, false);
listView.setAdapter(mAdapter);
mStaggeredLM = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
mStaggeredLM.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_MOVE_ITEMS_BETWEEN_SPANS);
listView.setLayoutManager(mStaggeredLM);
mScroll.setOnScrollChangeListener(new OnScrollChangeListener() {
@Override
public void onScrollChange(NestedScrollView arg0, int arg1, int arg2, int arg3, int arg4) {
View view = (View) mScroll.getChildAt(mScroll.getChildCount() - 1);
int diff = (view.getBottom() - ( mScroll.getHeight() + mScroll.getScrollY()));
if(diff == 0){
int visibleItemCount = mStaggeredLM.getChildCount();
int totalItemCount = mStaggeredLM.getItemCount();
int[] lastVisibleItemPositions = mStaggeredLM.findLastVisibleItemPositions(null);
int lastVisibleItemPos = getLastVisibleItem(lastVisibleItemPositions);
Log.e("getChildCount", String.valueOf(visibleItemCount));
Log.e("getItemCount", String.valueOf(totalItemCount));
Log.e("lastVisibleItemPos", String.valueOf(lastVisibleItemPos));
if ((visibleItemCount + 5) >= totalItemCount) {
mLoadMore.setVisibility(View.VISIBLE);
Log.e("LOG", "Last Item Reached!");
}
mMore = true;
mFresh = false;
mRefresh = false;
getPosts();
}
}
});
P.s :我已将加载更多设置为滚动视图，因为 recyclerview 连续执行且不可停止！
P.s : I've set load more to scroll view, because recyclerview do it continuously and none stoppable!
感谢任何帮助
推荐答案
这是因为我们有一个回收器视图，它在滚动视图中具有滚动行为.(在卷轴内滚动)
This is because we have a recycler view which has scroll behaviour inside a scroll view. (scroll inside a scroll)
我认为解决此问题的最佳方法是将您的 profileCardview 作为回收器视图中的标题，然后删除嵌套的滚动视图.
I think the best way to resolve this issue is to your profileCardview as a header in your recycler view and then remove the nested scroll view.
如果它是一个列表视图，那么它就像 listView.addHeaderView(profileCardView) 一样简单，但对于 Recycler 视图，没有 addheadview 等效项.因此，您可以参考以下链接来更改您的实现.
If it were a listview then it was as simple as listView.addHeaderView(profileCardView) but for the Recycler view there is no addheadview equivalent. Hence you could refer the below link to change your implementation.
是否有与 RecyclerView 等效的 addHeaderView?
这篇关于RecyclerView 在 NestedScrollView 中使用时不会回收视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
