[英]View Recycling not happens with Multiple Recyclerview inside NestedScrollView
I am stuck with a issue in managing Multiple Recyclerview
recycling inside a NestedScrollView
. 我遇到了在NestedScrollView
中管理Multiple Recyclerview
回收的NestedScrollView
。 Let me tell what I am trying to do - 让我告诉我想做什么 -
FrameLayout
inside a NestedScroolView
, frame1 recyclerview is recycling all the view's properly but frame2 recylerview is not recycling the view , dont know why ? 现在我已将两个FrameLayout
放在NestedScroolView
,frame1 recyclerview正在回收所有视图,但是frame2 recylerview不回收视图,不知道为什么? it first load all items then shows on screen. 它首先加载所有项目,然后在屏幕上显示。 Some Code : 一些代码:
MainActivity.java MainActivity.java
FragmentTransaction transaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
FragmentA frag1=new FragmentA();
FragmentB frag2=new FragmentB();
transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame1, frag1);
transaction.addToBackStack(frag1.getClass().getName());
transaction.commit();
transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame2, frag2);
transaction.addToBackStack(frag2.getClass().getName());
transaction.commit();
}
main.xml main.xml中
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<FrameLayout
android:id="@+id/frame1"
android:layout_width="match_parent"
android:layout_height="185dp" />
<FrameLayout
android:id="@+id/frame2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>
FragmentA : 片段A:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v= inflater.inflate(R.layout.recycler_view, container, false);
mDataListView = (RecyclerView) v.findViewById(R.id.data_list_view);
mDataListView .setHasFixedSize(true);
final GridLayoutManager gridLayoutManager = new GridLayoutManager(getActivity(), getActivity().getResources().getInteger(R.integer.playlist_categories_columns), GridLayoutManager.VERTICAL, false);
mDataListView .setNestedScrollingEnabled(false);
}
}));
return v;
}
FragmentB : 片段B:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v= inflater.inflate(R.layout.recycler_view, container, false);
mDataListView = (RecyclerView) v.findViewById(R.id.data_list_view);
mDataListView .setHasFixedSize(true);
final GridLayoutManager gridLayoutManager = new GridLayoutManager(getActivity(), 1, GridLayoutManager.HORIZONTAL, false);
mDataListView .setLayoutManager(gridLayoutManager);
mDataListView .setNestedScrollingEnabled(false);
}
}));
return v;
}
recycler_view.xml recycler_view.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/data_list_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
I hope I am clear with my question. 我希望我对自己的问题很清楚。
From my Experience I found that view recycling is not possible with multiple recyclerview's
inside a NestedScrollView
. 根据我的经验,我发现在NestedScrollView
使用多个recyclerview's
无法进行视图回收。
But I figure out the solution to show multiple Recyclerview's as per my requirement i want to show one Horizontal Recyclerview on top and one Vertical Recyclerview below it so what i did I am sharing may it helps someone. 但是我想出了根据我的要求显示多个Recyclerview的解决方案我想在顶部显示一个Horizontal Recyclerview,在它下面显示一个Vertical Recyclerview,所以我所做的我可以帮助某人。
I removed the NestedScrollView
as parent of Recyclerview's
and made Horizontal Recyclerview
as HeaderView
of Vertical Recyclerview
. 我删除了NestedScrollView
作为Recyclerview's
父级,并将Horizontal Recyclerview
作为Vertical Recyclerview
HeaderView
。
code : 代码:
public class ListHeaderAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int TYPE_HEADER = 0;
private static final int TYPE_ITEM = 1;
ArrayList<String> data;
public ListHeaderAdapter (ArrayList<String> data) {
this.data = data;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_ITEM) {
//inflate your layout and pass it to view holder
return new VHItem(null);
} else if (viewType == TYPE_HEADER) {
//inflate your layout and pass it to view holder
return new VHHeader(null);
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
int pos = position - 1; // for handling of Header view(use pos to fetch data from list)
if (holder instanceof VHItem) {
String dataItem = data.get(pos);
//cast holder to VHItem and set data
} else if (holder instanceof VHHeader) {
//cast holder to VHHeader and set data for header.
}
}
@Override
public int getItemCount() {
return data.size()+ 1; // for handling of Header view
}
@Override
public int getItemViewType(int position) {
if (isHeader(position))
return TYPE_HEADER;
return TYPE_ITEM;
}
public boolean isHeader(int position) {
return position == 0;
}
class VHItem extends RecyclerView.ViewHolder {
TextView title;
public VHItem(View itemView) {
super(itemView);
}
}
class VHHeader extends RecyclerView.ViewHolder {
Button button;
public VHHeader(View itemView) {
super(itemView);
}
}
}
Note : same logic can be implemented to show Horizontal RecyclerView's
at any Position 注意:可以实现相同的逻辑以在任何位置显示Horizontal RecyclerView's
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