在recyclerview的嵌套recyclerview中的嵌套列表中添加项目

Question

我有一个 recyclerview，我试图在其中添加一个包含列表的嵌套 recyclerview。这是我想要做的：

This is the closest solution I could find 堆栈溢出，但它们使用标题而不是左对齐标题，这些标题包含所有其他嵌套视图。如何在 recyclerview 内的嵌套 recyclerview 中创建嵌套列表？

Answer 1

我们需要两个 RecyclerViews 和两个 Adapters 我称之为 inner 和 outer.inside ViewHolder 的外部适配器放入 innerRecyclerView 和内部的外部适配器设置适配器的 onBindViewHolder 到 innerRecyclerView.i 最近开发了一个这样的测试项目

这里是外部适配器

public class MainAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

private Context context;
private List<Category> categories;
private List<Ads> ads_list;
private List<Products> productsList;
private int count;
private int width;

public MainAdapter(Context context, List<Category> categories, List<Ads> ads_list,List<Products> productsList,int width) {
    this.context = context;
    this.categories = categories;
    this.ads_list = ads_list;
    this.productsList=productsList;
    this.width=width;
    //Helper.logDebug("main__adapter",String.valueOf(categories.size()));
    //Helper.logDebug("main_adapter","haminjoori");
}

private class ViewHolder extends RecyclerView.ViewHolder{
    private RecyclerView recyclerView;
    private TextView tv_type,ad_tv_image_address;
    private ImageView iv_ad;

    public ViewHolder(@NonNull View itemView) {
        super(itemView);

        recyclerView=itemView.findViewById(R.id.recyclerview_horizental);
        recyclerView.setNestedScrollingEnabled(false);
        tv_type=itemView.findViewById(R.id.tv_type);
        iv_ad=itemView.findViewById(R.id.iv_ad);
        ad_tv_image_address=itemView.findViewById(R.id.ad_image_address);
        //Helper.logDebug("main_adapter","haminjoori");
    }
}

@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view= LayoutInflater.from(context).inflate(R.layout.recycler_layout,viewGroup,false);
    //Helper.logDebug("main_adapter","haminjoori");
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
    ViewHolder holder= (ViewHolder) viewHolder;
    try {
        String banner_url=ads_list.get(i).getImage();
        holder.ad_tv_image_address.setText(banner_url);
        Picasso.get().load(context.getString(R.string.base_url_banner)+banner_url).into(holder.iv_ad);
    }catch (Exception ex){
        holder.ad_tv_image_address.setText("");
    }
    Helper.logDebug("main_adapter",holder.ad_tv_image_address.getText().toString());
    holder.tv_type.setText(categories.get(i).getName());
    SecondAdapter secondAdapter=new SecondAdapter(categories.get(i).getProducts(),context,width);
    LinearLayoutManager layoutManager=new LinearLayoutManager(context,LinearLayoutManager.HORIZONTAL,false);

    holder.recyclerView.setLayoutManager(layoutManager);
    holder.recyclerView.setAdapter(secondAdapter);



}

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

这是内部适配器

public class SecondAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

private Context context;
private int count;
private List<Products> productsList;
private List<Category> categories;
private int width;

public SecondAdapter(List<Products> productsList, Context context,int width) {
    this.productsList = productsList;
    this.context = context;
    this.width=width;
}

private class ViewHolder extends RecyclerView.ViewHolder {
    private TextView market_price,our_price,name,unit,min_amount,image;
    private ImageView imagee;
    public ViewHolder(@NonNull View itemView) {
        super(itemView);
        itemView.getLayoutParams().width=width/2;


        market_price=itemView.findViewById(R.id.product_market_price);
        our_price=itemView.findViewById(R.id.product_our_price);
        name=itemView.findViewById(R.id.fruit_name);
        unit=itemView.findViewById(R.id.fruit_unit);
        image=itemView.findViewById(R.id.product_image_url);
        imagee=itemView.findViewById(R.id.iv_rec);
        min_amount=itemView.findViewById(R.id.product_min_amount);

        Log.d("second_adapter","haminjoori");
    }
}

@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view= LayoutInflater.from(context).inflate(R.layout.recycler2_layout,viewGroup,false);
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
    ViewHolder holder= (ViewHolder) viewHolder;
    Helper.logDebug("second_adapter","haminjori");

    holder.name.setText(productsList.get(i).getName());
    holder.unit.setText(productsList.get(i).getUnit());
    holder.market_price.setText(String.valueOf(productsList.get(i).getMarketPrice()));
    holder.our_price.setText(String.valueOf(productsList.get(i).getOurPrice()));
    Helper.logDebug("secondAdapter",productsList.get(i).getImage());
    String address=productsList.get(i).getImage();
    address=address.substring(6);
    holder.image.setText(address);
    String full_address=context.getString(R.string.base_url_image)+address;
    Helper.logDebug("secondAdapter",full_address);
    Picasso.get().load(full_address).into(holder.imagee);
    holder.min_amount.setText(String.valueOf(productsList.get(i).getMin_amount()));
}

@Override
public int getItemCount() {

    Helper.logDebug("second_adapter",String.valueOf(productsList.size()));
    return productsList.size();
}
}

外部视图适配器 xml

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools"         
android:layout_height="wrap_content" android:layout_width="match_parent" 
xmlns:android="http://schemas.android.com/apk/res/android">

  <TextView android:layout_height="wrap_content" 
  android:layout_width="wrap_content" android:text="نوع میوه" 
  android:layout_marginBottom="4dp" android:layout_marginTop="4dp" 
  android:layout_centerHorizontal="true" style="@style/main_titles" 
  android:id="@+id/tv_type"/>

  <ImageView android:layout_height="wrap_content" 
  android:layout_width="wrap_content" 
  android:src="@drawable/ic_keyboard_arrow_right_black_24dp" 
  android:layout_alignParentRight="true"/>

  <android.support.v7.widget.RecyclerView 
  android:layout_height="wrap_content" android:layout_width="match_parent" 
  android:id="@+id/recyclerview_horizental" 
  android:layout_below="@id/tv_type" 
  app:layoutManager="android.support.v7.widget.LinearLayoutManager" 
  android:orientation="horizontal" 
  tools:listitem="@layout/recycler2_layout"/>

  <TextView android:layout_height="wrap_content" 
  android:layout_width="wrap_content" android:id="@+id/ad_image_address" 
  android:visibility="gone"/>

  <ImageView android:layout_height="80dp" android:layout_width="match_parent" 
  android:id="@+id/iv_ad" 
  android:layout_below="@id/recyclerview_horizental"/>

  </RelativeLayout>

内部视图适配器 xml

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout android:orientation="horizontal" 
android:layout_height="wrap_content" android:layout_width="match_parent" 
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout android:layout_height="wrap_content" 
android:layout_width="0dp" android:layout_weight="1" 
android:id="@+id/rel_layout">

<ImageView android:layout_height="200dp" android:layout_width="match_parent" 
android:id="@+id/iv_rec"/>

<TextView android:layout_height="wrap_content" 
android:layout_width="wrap_content" android:id="@+id/fruit_name" 
android:textColor="@color/semi_black" android:textSize="14sp" 
android:layout_marginRight="8dp" android:layout_below="@id/iv_rec" 
android:layout_alignParentRight="true" android:text="نام میوه"/>

<TextView android:layout_height="wrap_content" 
android:layout_width="wrap_content" android:id="@+id/fruit_unit" 
android:textColor="@color/black_white" android:textSize="12sp" 
android:layout_below="@id/iv_rec" android:text="واحد" 
android:layout_alignParentLeft="true" android:layout_marginLeft="8dp"/>

<TextView android:layout_height="wrap_content" 
android:layout_width="wrap_content" android:id="@+id/product_market_price" 
android:textColor="@color/semi_black" android:textSize="12sp" 
android:layout_below="@id/fruit_unit" android:text="قیمت مارکت" 
android:layout_alignParentLeft="true" android:layout_marginLeft="8dp"/>

<TextView android:layout_height="wrap_content" 
android:layout_width="wrap_content" android:id="@+id/product_our_price" 
android:textColor="@color/semi_black" android:textSize="12sp" 
android:layout_below="@id/product_market_price" android:text="قیمت ما" 
android:layout_alignParentLeft="true" android:layout_marginLeft="8dp"/>

<TextView android:layout_height="wrap_content" 
android:layout_width="wrap_content" android:id="@+id/product_min_amount" 
android:textColor="@color/semi_black" android:textSize="12sp" 
android:layout_below="@id/product_market_price" 
android:layout_alignParentLeft="true" android:layout_marginLeft="8dp" 
android:visibility="gone"/>

<TextView android:layout_height="wrap_content" 
android:layout_width="wrap_content" android:id="@+id/product_image_url" 
android:textColor="@color/semi_black" android:textSize="12sp" 
android:layout_below="@id/product_market_price" 
android:layout_alignParentLeft="true" android:layout_marginLeft="8dp" 
android:visibility="gone"/>

</RelativeLayout>

<RelativeLayout android:layout_height="wrap_content" 
android:layout_width="0dp" android:layout_weight="1" 
android:visibility="gone"> </RelativeLayout>

</LinearLayout>

最终结果会是这样的......（这是类似的东西，不完全是xml文件）

类别是外部RecyclerView，水果是内部RecyclerView

如果您在执行此操作时遇到问题，请询问我...