Android 将多个可展开的CardView添加到布局中

我正在使用为我的布局创建

可展开的CardView

。按预期工作，但现在我想在同一个片段布局中添加多个

cardwiews

，动态绑定到加载的一些异步列表数据。那怎么可能呢

按照库上的演示进行操作。以下是我如何在布局中添加卡片：

<LinearLayout
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/watchlist_holder"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="20dp"
    android:orientation="vertical"
    android:clipChildren="false"
    android:background="#FAFAFA">

    <com.alespero.expandablecardview.ExpandableCardView
         android:id="@+id/main_profile_card"
         android:layout_marginLeft="10dp"
         android:layout_marginRight="10dp"
         android:layout_marginTop="10dp"
         android:layout_marginBottom="10dp"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         app:title="My Watchlist"
         app:inner_view="@layout/watchlist_layout"
         app:expandOnClick="true" />
</LinearLayout>

---

@layout/watchlist\u layout

是我想重复的一个布局，它包含一些

textView

和一个

recyclerView

来显示列表数据。任何帮助或指导都会很好。

您需要为每个

RecyclerView

创建不同的

Adapter

和内行XML布局文件

例如：在

main活动

内的

RecyclerView

中为布局充气。您正在使用一个

适配器

类，该类根据您的列表对行进行膨胀。在

onBindViewHolder

内部，您应该获得父视图行布局中存在的内部

RecyclerView

的对象。拥有对象后，创建另一个列表并为内部recyclerview初始化另一个适配器。使用新适配器填充其中的数据（类似于第一个recyclerview）

请记住，每个recyclerview的过程都是一样的

步骤：

在要显示列表的布局内创建recylcerview

根据列表数据的数量，在每一行中创建一个单独的行\ u布局以进行膨胀

克里特是一个适配器类，它从父类接收数据，并在recyclerview中放大布局（行布局）

对N个嵌套的RecyclerViews重复这些步骤

为了演示，我附上了这个答案的示例代码，以帮助您理解我的概念

活动\u main.xml

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recylcerViewParent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <com.alespero.expandablecardview.ExpandableCardView
        android:id="@+id/main_profile_card"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        app:expandOnClick="true"
        app:inner_view="@layout/watchlist_inner"
        app:title="My Watchlist" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_with_favorites"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">


    <TextView
        android:id="@+id/favorites_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginLeft="@dimen/margin_small"
        android:textSize="12sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:orientation="horizontal"
        android:weightSum="2">

        <Button
            android:id="@+id/btn_view_details"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="start|center_vertical"
            android:padding="5dp"
            android:text="Atish"
            android:textColor="@color/colorPrimaryDark" />

        <Button
            android:id="@+id/btn_add_symbols"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="end|center_vertical"
            android:padding="5dp"
            android:text="Agrawal"
            android:textColor="@color/colorPrimaryDark" />
    </LinearLayout>


</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_with_favorites"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">


    <TextView
        android:id="@+id/favorites_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginLeft="@dimen/margin_small"
        android:textSize="12sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:orientation="horizontal"
        android:weightSum="2">

        <Button
            android:id="@+id/btn_view_details"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="start|center_vertical"
            android:padding="5dp"
            android:text="VIEW DETAILS"
            android:textColor="@color/colorPrimaryDark" />

        <Button
            android:id="@+id/btn_add_symbols"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="end|center_vertical"
            android:padding="5dp"
            android:text="ADD SYMBOLS"
            android:textColor="@color/colorPrimaryDark" />
    </LinearLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view_favorite"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:layout_marginBottom="@dimen/margin_small" />

</LinearLayout>

项目布局行.xml

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recylcerViewParent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <com.alespero.expandablecardview.ExpandableCardView
        android:id="@+id/main_profile_card"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        app:expandOnClick="true"
        app:inner_view="@layout/watchlist_inner"
        app:title="My Watchlist" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_with_favorites"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">


    <TextView
        android:id="@+id/favorites_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginLeft="@dimen/margin_small"
        android:textSize="12sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:orientation="horizontal"
        android:weightSum="2">

        <Button
            android:id="@+id/btn_view_details"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="start|center_vertical"
            android:padding="5dp"
            android:text="Atish"
            android:textColor="@color/colorPrimaryDark" />

        <Button
            android:id="@+id/btn_add_symbols"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="end|center_vertical"
            android:padding="5dp"
            android:text="Agrawal"
            android:textColor="@color/colorPrimaryDark" />
    </LinearLayout>


</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_with_favorites"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">


    <TextView
        android:id="@+id/favorites_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginLeft="@dimen/margin_small"
        android:textSize="12sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:orientation="horizontal"
        android:weightSum="2">

        <Button
            android:id="@+id/btn_view_details"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="start|center_vertical"
            android:padding="5dp"
            android:text="VIEW DETAILS"
            android:textColor="@color/colorPrimaryDark" />

        <Button
            android:id="@+id/btn_add_symbols"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="end|center_vertical"
            android:padding="5dp"
            android:text="ADD SYMBOLS"
            android:textColor="@color/colorPrimaryDark" />
    </LinearLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view_favorite"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:layout_marginBottom="@dimen/margin_small" />

</LinearLayout>

物品\u回收商\u查看\u收藏夹.xml

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recylcerViewParent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <com.alespero.expandablecardview.ExpandableCardView
        android:id="@+id/main_profile_card"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        app:expandOnClick="true"
        app:inner_view="@layout/watchlist_inner"
        app:title="My Watchlist" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_with_favorites"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">


    <TextView
        android:id="@+id/favorites_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginLeft="@dimen/margin_small"
        android:textSize="12sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:orientation="horizontal"
        android:weightSum="2">

        <Button
            android:id="@+id/btn_view_details"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="start|center_vertical"
            android:padding="5dp"
            android:text="Atish"
            android:textColor="@color/colorPrimaryDark" />

        <Button
            android:id="@+id/btn_add_symbols"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="end|center_vertical"
            android:padding="5dp"
            android:text="Agrawal"
            android:textColor="@color/colorPrimaryDark" />
    </LinearLayout>


</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_with_favorites"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">


    <TextView
        android:id="@+id/favorites_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginLeft="@dimen/margin_small"
        android:textSize="12sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:orientation="horizontal"
        android:weightSum="2">

        <Button
            android:id="@+id/btn_view_details"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="start|center_vertical"
            android:padding="5dp"
            android:text="VIEW DETAILS"
            android:textColor="@color/colorPrimaryDark" />

        <Button
            android:id="@+id/btn_add_symbols"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="end|center_vertical"
            android:padding="5dp"
            android:text="ADD SYMBOLS"
            android:textColor="@color/colorPrimaryDark" />
    </LinearLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view_favorite"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:layout_marginBottom="@dimen/margin_small" />

</LinearLayout>

监视列表_inner.xml

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recylcerViewParent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <com.alespero.expandablecardview.ExpandableCardView
        android:id="@+id/main_profile_card"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        app:expandOnClick="true"
        app:inner_view="@layout/watchlist_inner"
        app:title="My Watchlist" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_with_favorites"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">


    <TextView
        android:id="@+id/favorites_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginLeft="@dimen/margin_small"
        android:textSize="12sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:orientation="horizontal"
        android:weightSum="2">

        <Button
            android:id="@+id/btn_view_details"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="start|center_vertical"
            android:padding="5dp"
            android:text="Atish"
            android:textColor="@color/colorPrimaryDark" />

        <Button
            android:id="@+id/btn_add_symbols"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="end|center_vertical"
            android:padding="5dp"
            android:text="Agrawal"
            android:textColor="@color/colorPrimaryDark" />
    </LinearLayout>


</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_with_favorites"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">


    <TextView
        android:id="@+id/favorites_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginLeft="@dimen/margin_small"
        android:textSize="12sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:orientation="horizontal"
        android:weightSum="2">

        <Button
            android:id="@+id/btn_view_details"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="start|center_vertical"
            android:padding="5dp"
            android:text="VIEW DETAILS"
            android:textColor="@color/colorPrimaryDark" />

        <Button
            android:id="@+id/btn_add_symbols"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:gravity="end|center_vertical"
            android:padding="5dp"
            android:text="ADD SYMBOLS"
            android:textColor="@color/colorPrimaryDark" />
    </LinearLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view_favorite"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginStart="@dimen/margin_small"
        android:layout_marginEnd="@dimen/margin_small"
        android:layout_marginBottom="@dimen/margin_small" />

</LinearLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {


    List<String> stringsList = new ArrayList<>();

    RecyclerView recyclerViewLayout;
    InnerAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        recyclerViewLayout = findViewById(R.id.recylcerViewParent);


        //Dummy add 10 objects in the list

        for (int i = 0; i < 10; i++) {
            stringsList.add(String.valueOf(i));
        }


        populateRecyclerView();
    }


    /**
     * Create N items in the recycler view
     */
    private void populateRecyclerView() {


        //Initialize Adapter

        recyclerViewLayout.setLayoutManager(new LinearLayoutManager(this));
        recyclerViewLayout.setHasFixedSize(false);

        adapter = new InnerAdapter(recyclerViewLayout, this);
        adapter.setData(this.stringsList);
        recyclerViewLayout.setAdapter(adapter);


    }
}

public class InnerAdapter extends RecyclerView.Adapter<InnerAdapter.ViewHolder> {
    private List<String> data;
    private RecyclerView recyclerView;
    private int i = 0;
    private Context mContext;

    public InnerAdapter(RecyclerView recyclerView, Context context) {
        this.recyclerView = recyclerView;
        this.mContext = context;

    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        //Inflater creates rows from a given layout file


        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View v = inflater.inflate(R.layout.item_layout_row, parent, false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

        //Method to perform actions on individual row based on the position. We will get back to this later


        //Change the title of the CardView
        holder.main_profile_card.setTitle(String.valueOf(position));


        //Creating a dummy adapter again to populate the inner recyclerview
        List<String> innerData = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            innerData.add(String.valueOf(i));
        }

        //Initialize Inner Adapter
        holder.recycler_view_favorite.setLayoutManager(new LinearLayoutManager(mContext));
        holder.recycler_view_favorite.setHasFixedSize(false);
        InnerFavAdapter adapter = new InnerFavAdapter(holder.recycler_view_favorite, mContext);
        adapter.setData(innerData);
        holder.recycler_view_favorite.setAdapter(adapter);

    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    public void setData(List<String> data) {
        this.data = data;
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        RecyclerView recycler_view_favorite;
        ExpandableCardView main_profile_card;

        ViewHolder(View itemView) {
            super(itemView);

            //Get the object of the views from the row layout
            main_profile_card = itemView.findViewById(R.id.main_profile_card);
            recycler_view_favorite = itemView.findViewById(R.id.recycler_view_favorite);
        }
    }
}

public class InnerFavAdapter extends RecyclerView.Adapter<InnerFavAdapter.ViewHolder> {
    private List<String> data;
    private RecyclerView recyclerView;
    private int i = 0;
    private Context mContext;

    public InnerFavAdapter(RecyclerView recyclerView, Context context) {
        this.recyclerView = recyclerView;
        this.mContext = context;

    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        //Inflater creates rows from a given layout file


        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View v = inflater.inflate(R.layout.inner_recycler_view_favorite, parent, false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

        //Method to perform actions on individual row based on the position. We will get back to this later


    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    public void setData(List<String> data) {
        this.data = data;
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        ViewHolder(View itemView) {
            super(itemView);


        }
    }
}

public类MainActivity扩展了AppCompatActivity{
List stringsList=新的ArrayList（）；
回收视图回收视图布局；
内部适配器；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
recyclerViewLayout=findViewById（R.id.recylcerViewParent）；
//在列表中添加10个对象
对于（int i=0；i<10；i++）{
stringsList.add（String.valueOf（i））；
}
populateRecyclerView（）；
}
/**
*在“回收器”视图中创建N个项目
*/
私有void populateRecyclerView（）{
//初始化适配器
setLayoutManager（新的LinearLayoutManager（this））；
recyclerViewLayout.setHasFixedSize（false）；
适配器=新的内部适配器（recyclerViewLayout，this）；
adapter.setData（this.stringsList）；
设置适配器（适配器）；
}
}

InnerAdapter.java

public class MainActivity extends AppCompatActivity {


    List<String> stringsList = new ArrayList<>();

    RecyclerView recyclerViewLayout;
    InnerAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        recyclerViewLayout = findViewById(R.id.recylcerViewParent);


        //Dummy add 10 objects in the list

        for (int i = 0; i < 10; i++) {
            stringsList.add(String.valueOf(i));
        }


        populateRecyclerView();
    }


    /**
     * Create N items in the recycler view
     */
    private void populateRecyclerView() {


        //Initialize Adapter

        recyclerViewLayout.setLayoutManager(new LinearLayoutManager(this));
        recyclerViewLayout.setHasFixedSize(false);

        adapter = new InnerAdapter(recyclerViewLayout, this);
        adapter.setData(this.stringsList);
        recyclerViewLayout.setAdapter(adapter);


    }
}

public class InnerAdapter extends RecyclerView.Adapter<InnerAdapter.ViewHolder> {
    private List<String> data;
    private RecyclerView recyclerView;
    private int i = 0;
    private Context mContext;

    public InnerAdapter(RecyclerView recyclerView, Context context) {
        this.recyclerView = recyclerView;
        this.mContext = context;

    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        //Inflater creates rows from a given layout file


        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View v = inflater.inflate(R.layout.item_layout_row, parent, false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

        //Method to perform actions on individual row based on the position. We will get back to this later


        //Change the title of the CardView
        holder.main_profile_card.setTitle(String.valueOf(position));


        //Creating a dummy adapter again to populate the inner recyclerview
        List<String> innerData = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            innerData.add(String.valueOf(i));
        }

        //Initialize Inner Adapter
        holder.recycler_view_favorite.setLayoutManager(new LinearLayoutManager(mContext));
        holder.recycler_view_favorite.setHasFixedSize(false);
        InnerFavAdapter adapter = new InnerFavAdapter(holder.recycler_view_favorite, mContext);
        adapter.setData(innerData);
        holder.recycler_view_favorite.setAdapter(adapter);

    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    public void setData(List<String> data) {
        this.data = data;
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        RecyclerView recycler_view_favorite;
        ExpandableCardView main_profile_card;

        ViewHolder(View itemView) {
            super(itemView);

            //Get the object of the views from the row layout
            main_profile_card = itemView.findViewById(R.id.main_profile_card);
            recycler_view_favorite = itemView.findViewById(R.id.recycler_view_favorite);
        }
    }
}

public class InnerFavAdapter extends RecyclerView.Adapter<InnerFavAdapter.ViewHolder> {
    private List<String> data;
    private RecyclerView recyclerView;
    private int i = 0;
    private Context mContext;

    public InnerFavAdapter(RecyclerView recyclerView, Context context) {
        this.recyclerView = recyclerView;
        this.mContext = context;

    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        //Inflater creates rows from a given layout file


        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View v = inflater.inflate(R.layout.inner_recycler_view_favorite, parent, false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

        //Method to perform actions on individual row based on the position. We will get back to this later


    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    public void setData(List<String> data) {
        this.data = data;
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        ViewHolder(View itemView) {
            super(itemView);


        }
    }
}

公共类InnerAdapter扩展了RecyclerView.Adapter{
私人名单数据；
私人回收站；
私有整数i=0；
私有上下文；
公共InnerAdapter（RecyclerView RecyclerView，上下文）{
this.recyclerView=recyclerView；
this.mContext=上下文；
}
@非空
@凌驾
public ViewHolder onCreateViewHolder（@NonNull ViewGroup parent，int viewType）{
//充气器从给定布局文件创建行
LayoutInflater充气器=LayoutInflater.from（parent.getContext（））；
视图v=充气机。充气（R.layout.item_layout_row，parent，false）；
返回新的视图持有者（v）；
}
@凌驾
public void onBindViewHolder（@NonNull ViewHolder，int位置）{
//方法对基于位置的单个行执行操作。我们稍后将返回到此操作
//更改CardView的标题
持有者.main_profile_card.setTitle（String.valueOf（position））；
//再次创建虚拟适配器以填充内部recyclerview
List innerData=new ArrayList（）；
对于（int i=0；i<10；i++）{
add（String.valueOf（i））；
}
//初始化内部适配器
holder.recycler\u view\u favorite.setLayoutManager（新的LinearLayoutManager（mContext））；
holder.recycler\u view\u favorite.setHasFixedSize（false）；
InnerFavaAdapter=新的InnerFavaAdapter（holder.recycler\u view\u favorite，mContext）；
adapter.setData（innerData）；
holder.recycler\u view\u favorite.setAdapter（适配器）；
}
@凌驾
public int getItemCount（）{
返回data.size（）；
}
公共无效设置数据（列表数据）{
这个数据=数据；
}
类ViewHolder扩展了RecyclerView.ViewHolder{
RecyclerView recycler\u view\u favorite；
可扩展卡查看主配置文件卡；
ViewHolder（视图项视图）{
超级（项目视图）；
//从行布局中获取视图的对象
main\u profile\u card=itemView.findviewbyd（R.id.main\u profile\u card）；
recycler\u view\u favorite=itemView.findViewById（R.id.recycler\u view\u favorite）；
}
}
}

InnerFavAdapter.java

public class MainActivity extends AppCompatActivity {


    List<String> stringsList = new ArrayList<>();

    RecyclerView recyclerViewLayout;
    InnerAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        recyclerViewLayout = findViewById(R.id.recylcerViewParent);


        //Dummy add 10 objects in the list

        for (int i = 0; i < 10; i++) {
            stringsList.add(String.valueOf(i));
        }


        populateRecyclerView();
    }


    /**
     * Create N items in the recycler view
     */
    private void populateRecyclerView() {


        //Initialize Adapter

        recyclerViewLayout.setLayoutManager(new LinearLayoutManager(this));
        recyclerViewLayout.setHasFixedSize(false);

        adapter = new InnerAdapter(recyclerViewLayout, this);
        adapter.setData(this.stringsList);
        recyclerViewLayout.setAdapter(adapter);


    }
}

public class InnerAdapter extends RecyclerView.Adapter<InnerAdapter.ViewHolder> {
    private List<String> data;
    private RecyclerView recyclerView;
    private int i = 0;
    private Context mContext;

    public InnerAdapter(RecyclerView recyclerView, Context context) {
        this.recyclerView = recyclerView;
        this.mContext = context;

    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        //Inflater creates rows from a given layout file


        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View v = inflater.inflate(R.layout.item_layout_row, parent, false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

        //Method to perform actions on individual row based on the position. We will get back to this later


        //Change the title of the CardView
        holder.main_profile_card.setTitle(String.valueOf(position));


        //Creating a dummy adapter again to populate the inner recyclerview
        List<String> innerData = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            innerData.add(String.valueOf(i));
        }

        //Initialize Inner Adapter
        holder.recycler_view_favorite.setLayoutManager(new LinearLayoutManager(mContext));
        holder.recycler_view_favorite.setHasFixedSize(false);
        InnerFavAdapter adapter = new InnerFavAdapter(holder.recycler_view_favorite, mContext);
        adapter.setData(innerData);
        holder.recycler_view_favorite.setAdapter(adapter);

    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    public void setData(List<String> data) {
        this.data = data;
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        RecyclerView recycler_view_favorite;
        ExpandableCardView main_profile_card;

        ViewHolder(View itemView) {
            super(itemView);

            //Get the object of the views from the row layout
            main_profile_card = itemView.findViewById(R.id.main_profile_card);
            recycler_view_favorite = itemView.findViewById(R.id.recycler_view_favorite);
        }
    }
}

public class InnerFavAdapter extends RecyclerView.Adapter<InnerFavAdapter.ViewHolder> {
    private List<String> data;
    private RecyclerView recyclerView;
    private int i = 0;
    private Context mContext;

    public InnerFavAdapter(RecyclerView recyclerView, Context context) {
        this.recyclerView = recyclerView;
        this.mContext = context;

    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        //Inflater creates rows from a given layout file


        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View v = inflater.inflate(R.layout.inner_recycler_view_favorite, parent, false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

        //Method to perform actions on individual row based on the position. We will get back to this later


    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    public void setData(List<String> data) {
        this.data = data;
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        ViewHolder(View itemView) {
            super(itemView);


        }
    }
}

公共类InnerFavAdapter扩展了RecyclerView.Adapter{
私人名单数据；
私人回收站；
私有整数i=0；
私有上下文；
公共InnerFavAdapter（RecyclerView RecyclerView，上下文）{
this.recyclerView=recyclerView；
this.mContext=上下文；
}
@非空
@凌驾
public ViewHolder onCreateViewHolder（@NonNull ViewGroup parent，int viewType）{
//充气机创建行fr