android - 如何不在嵌套布局中重复回收视图？
问题描述
我正在尝试创建一个嵌套的回收视图。到目前为止，我有一个父回收视图，在此之下我有一个子回收视图。我遇到的问题是我的子回收视图继续与我的父回收视图一起回收。我不希望这样，我希望子回收视图只被回收一次。有谁知道如何解决这个问题。我知道这听起来可能有点令人困惑，但我想要的一个例子是 instagram 新闻提要。应用程序的顶部有圆形图像视图，您的关注者故事可以滑动，底部有新闻提要本身，在我的情况下，我的应用程序在新闻提要下不断加载用户故事，因为我继续滚动用户故事不断在新闻提要帖子下回收。
带有父 recycleView 的主 UI
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF">
<androidx.appcompat.widget.Toolbar
android:id="@+id/newsFeedToolBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="4dp"
android:layout_marginTop="12dp"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ImageView
android:id="@+id/backButton"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_gravity="left"
android:background="@drawable/ic_arrow_back_black_24dp"
android:onClick="backImageView"
tools:layout_editor_absoluteX="16dp"
tools:layout_editor_absoluteY="15dp" />
</androidx.appcompat.widget.Toolbar>
<SearchView
android:id="@+id/searchView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_margin="6dp"
android:background="#FFFFFF"
android:iconifiedByDefault="false"
android:queryHint="Search"
app:layout_constraintBottom_toBottomOf="@+id/newsFeedToolBar"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="@+id/newsFeedToolBar"
app:layout_constraintTop_toTopOf="@+id/newsFeedToolBar"
app:searchIcon="@null" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/newsRecycleVIew"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/News"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="@+id/News"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="News"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.045"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/searchView" />
</androidx.constraintlayout.widget.ConstraintLayout>
*Row Item for parent recycleview added child recycle view*
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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/constraintlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="15dp">
<androidx.cardview.widget.CardView
android:id="@+id/cardView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
app:cardElevation="5dp"
app:cardUseCompatPadding="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/newsThumbNail"
android:layout_width="0dp"
android:layout_height="200dp"
android:scaleType="fitXY"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.448"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0" />
<TextView
android:id="@+id/newsTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Dangerous fire is out of control at 24 and park"
android:textSize="17sp"
app:layout_constraintEnd_toEndOf="@+id/newsThumbNail"
app:layout_constraintStart_toStartOf="@+id/newsThumbNail"
app:layout_constraintTop_toBottomOf="@+id/newsThumbNail" />
<TextView
android:id="@+id/newsBody"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:text="Some text is here"
app:layout_constraintEnd_toEndOf="@+id/newsTitle"
app:layout_constraintStart_toStartOf="@+id/newsTitle"
app:layout_constraintTop_toBottomOf="@+id/newsTitle" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/earningsRecycleView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.448"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView5" />
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:text="Upcoming Earnings"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.045"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/cardView" />
</androidx.constraintlayout.widget.ConstraintLayout>
**父 RecycleView 适配器 **
public class SearchStockAdapter extends RecyclerView.Adapter<SearchStockAdapter.SearchStocksViewHolder> {
private Context context;
private ArrayList<News_Model> stockInformaiton;
private RequestQueue requestQueue;
private SearchStockSubAdapter searchStockSubAdapter;
private RecyclerView.RecycledViewPool viewPool = new RecyclerView.RecycledViewPool();
public SearchStockAdapter(Context context, ArrayList<News_Model> stockInformaiton) {
this.context = context;
this.stockInformaiton = stockInformaiton;
}
@NonNull
@Override
public SearchStocksViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.search_stock_row, viewGroup, false);
requestQueue = Volley.newRequestQueue(context);
return new SearchStocksViewHolder(view);
}
//Loads data into views
@Override
public void onBindViewHolder(@NonNull SearchStocksViewHolder viewHolder, int i) {
viewHolder.newsTitle.setText(stockInformaiton.get(i).getTitle());
viewHolder.newsBody.setText(stockInformaiton.get(i).getDescription());
Glide.with(this.context).asBitmap().load(stockInformaiton.get(i).getUrlToImage()).into(viewHolder.newsThumbImage);
//Second recycle view...
LinearLayoutManager layoutManager = new LinearLayoutManager(
viewHolder.upcomingEarningsRecycleView.getContext(),
LinearLayoutManager.HORIZONTAL,
false
);
layoutManager.setInitialPrefetchItemCount(stockInformaiton.size());
//second recycle view..
SearchStockSubAdapter stockSubAdapter = new SearchStockSubAdapter(context, stockInformaiton);
viewHolder.upcomingEarningsRecycleView.setLayoutManager(layoutManager);
viewHolder.upcomingEarningsRecycleView.setAdapter(stockSubAdapter);
viewHolder.upcomingEarningsRecycleView.setHasFixedSize(true);
viewHolder.upcomingEarningsRecycleView.setRecycledViewPool(viewPool);
}
@Override
public int getItemCount() {
return stockInformaiton.size();
}
static class SearchStocksViewHolder extends RecyclerView.ViewHolder {
private TextView newsTitle, newsBody;
private ImageView newsThumbImage;
private RecyclerView upcomingEarningsRecycleView;
public SearchStocksViewHolder(@NonNull View itemView) {
super(itemView);
//newsThumbnail = itemView.findViewById(R.id.newsThumbNail);
newsTitle = itemView.findViewById(R.id.newsTitle);
newsBody = itemView.findViewById(R.id.newsBody);
newsThumbImage = itemView.findViewById(R.id.newsThumbNail);
upcomingEarningsRecycleView = itemView.findViewById(R.id.earningsRecycleView);
}
}
}
解决方案
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