android - 在 Recyclerview 的一个 TextView 中显示相同键的值

Question

我有以下 JSON 正在 GSON 和 Retrofit 中解析。我想显示相同 id 的值在一个 TextView 中。现在发生的情况是所有值都添加到数组中，并且它们显示在单独的 TextView 中。我想显示所有具有相同 id 的值显示在一个 TextView 中。例如。 id: 240 ab值应该在一个 TextView 中。目前，所有ab值在单独的 TextView 中。
这是数据当前的显示方式:

这就是我希望数据的样子:

JSON::

{
  "abc": {
    "1": {
      "1": {
        "ab": "some content",
        "id": "240",
        "key": "value"
      },
      "2": {
        "ab": "some content",
        "id": "240",
        "key": "value"
      },
      "3": {
        "ab": "some content",
        "id": "240",
        "key": "value"
      }
    },
    "2": {
      "1": {
        "ab": "more content",
        "id": "241",
        "key": "value"
      },
      "2": {
        "ab": "more content 1",
        "id": "241",
        "key": "value"
      },
      "3": {
        "ab": "more content 2",
        "id": "241",
        "key": "value"
      }
    }
  }
}

POJO内容::

public class POJOContent {

    @SerializedName("ab")
    public String content;

    @SerializedName("id")
    public String id;

    @SerializedName("key")
    public String key;

    @Override
    public String toString() {
        return content;
    }

    //getters and setters

}

我的内容包装器::

public class MyContentWrapper {
    public Map<Integer, MyMap> abc;
}

我的 map ::

public class MyMap extends HashMap<Integer, POJOContent> {
    @Override
    public POJOContent put(Integer key, POJOContent value) {
        if(null==value.getContent() || value.getContent().isBlank()) {
            return null;
        }
        // Added only if content = "ab" is not blank.
        return super.put(key, value);
    }
}

打回来:

    Callback<MyContentWrapper> myCallback = new Callback<MyContentWrapper>() {
                @Override
                public void onResponse(Call<MyContentWrapper> call, Response<MyContentWrapper> response) {
                    if (response.isSuccessful()) {
                        Log.d("Callback", " Message: " + response.raw());
                        Log.d("Callback", " Message: " + response.body().abc.values());

                        MyContentWrapper contentWrapper = response.body();

                        List<POJOContent> pojo = new ArrayList<>();

                        for (Map.Entry<Integer, MyMap> entry : contentWrapper.abc.entrySet()) {
                            Integer key = entry.getKey();
                            MyMap map = entry.getValue();
                            if (!map.isEmpty()){
                                Log.d("Callback", " Key: " + key);
                                Log.d("Callback", " Value: " + map.values());

                                pojo.addAll(map.values());
                            }
                        }

                        MyContentViewAdapter adapter = new MyContentViewAdapter(pojo);
                        recyclerView.setAdapter(adapter);
                    } else {
                        Log.d("Callback", "Code: " + response.code() + " Message: " + response.message());
                    }
                }
                @Override
                public void onFailure(Call<MyContentWrapper> call, Throwable t) {
                    t.printStackTrace();
                }
            };

回收适配器::

                public class MyContentViewAdapter extends RecyclerView.Adapter<MyContentViewAdapter.ViewHolder> {
    private List<POJOContent> data;
    private MyClickListener clickListener;


    public class ViewHolder extends RecyclerView.ViewHolder {
        public TextView text;
        private LinearLayout itemLayout;

        public ViewHolder(View v) {
            super(v);
            text = (TextView) v.findViewById(R.id.text_content);
        }
    }

    public MyContentViewAdapter(List<POJOContent> data) {
        this.data = data;
        Log.d("Recyclerview Data", data.toString());
    }


    @Override
    public MyContentViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v;
        v = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_content_card, parent, false);
        return new MyContentViewAdapter.ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(MyContentViewAdapter.ViewHolder holder, int position) {
        POJOContent pojo = data.get(position);
        Log.d("Recyclerview", pojo.getContent());
        holder.text.setText(pojo.getContent());
        holder.itemView.setTag(pojo.getContent());
    }

    public void setOnItemClickListener(MyClickListener clickListener) {
        this.clickListener = clickListener;
    }

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

}

Answer 1

编辑:
我添加了嵌套 RecyclerView里面 ViewHolder ，因此内容和值字段将动态显示。我正在添加 2 Adapter 的完整代码和
2 ViewHolder类、2 个 xml 布局和屏幕截图
我很确定它也会在非常大的列表中运行得非常顺利。
ID(240,241) 下的所有内容都是另一个 recyclerView。

这个想法是列表大小 ，为了让适配器自己填充，应该与不同 id 的数量一样多，因此只有那么多 Viewholders被充气。

 List<List<POJOContent>> listOfPojoLists = new ArrayList<>();

    for (Map.Entry<Integer, MyMap> entry : contentWrapper.abc.entrySet()) {
        Integer key = entry.getKey();
        MyMap map = entry.getValue();
        if (!map.isEmpty()){
            Log.d("Callback", " Key: " + key);
            Log.d("Callback", " Value: " + map.values());

            listOfPojoLists.add(new ArrayList<>(map.values()));
        }
    }

    MyContentViewAdapter adapter = new MyContentViewAdapter(listOfPojoLists);
    recyclerView.setAdapter(adapter);

MyContentViewAdapter.java

public class MyContentViewAdapter extends RecyclerView.Adapter<MyContentViewAdapter.ViewHolder> {
private List<List<POJOContent>> data;
private MyClickListener clickListener;


MyContentViewAdapter(List<List<POJOContent>> data) {
    this.data = data;
}

@Override
public MyContentViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.fragment_content_card, parent, false);
    return new MyContentViewAdapter.ViewHolder(v);
}

@Override
public void onBindViewHolder(MyContentViewAdapter.ViewHolder holder, int position) {
    holder.bind(data.get(position));
}

public void setOnItemClickListener(MyClickListener clickListener) {
    this.clickListener = clickListener;
}

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


class ViewHolder extends RecyclerView.ViewHolder {

    private TextView textId;
    private InnerListAdapter innerAdapter;

    // inside constructor we are initializing inner recyclerView and inner Adapter.
    // there will only be 3 - 5 instances of them ever created(using this 
    // particular viewHolder layouts), no more.
    // might be slightly more if u use layouts with lower height
    ViewHolder(View v) {
        super(v);
        textId =  v.findViewById(R.id.tv_Id);
        RecyclerView innerRecycler = v.findViewById(R.id.rv_inner_list);
        // I added DividerItemDecoration so it would be clear that there are actually different viewHolders
        // displayed by recyclerView
        innerRecycler.addItemDecoration(new DividerItemDecoration(v.getContext(), DividerItemDecoration.VERTICAL));
        innerAdapter = new InnerListAdapter();
        innerRecycler.setAdapter(innerAdapter);
    }

    /* We just submit new list for our inner adapter
    so it will handle rebinding values to its viewHolders */
    void bind(List<POJOContent> pojoList){
        textId.setText(pojoList.get(0).id);
        innerAdapter.setNewItems(pojoList);
    }
}

}

InnerListAdapter.java

public class InnerListAdapter extends RecyclerView.Adapter<InnerListAdapter.InnerViewHolder> {

private List<POJOContent> items = new ArrayList<>();

@NonNull
@Override
public InnerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    return new InnerViewHolder(LayoutInflater.from(parent.getContext())
            .inflate(R.layout.item_inner_list, parent, false));
}

@Override
public void onBindViewHolder(@NonNull InnerViewHolder holder, int position) {
    holder.bind(items.get(position));
}

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

void setNewItems(List<POJOContent> newItems){
    items.clear();
    items.addAll(newItems);
    notifyDataSetChanged();
}

class InnerViewHolder extends RecyclerView.ViewHolder{
    TextView tv_value;
    TextView tv_content;

    InnerViewHolder(@NonNull View itemView) {
        super(itemView);
        tv_value = itemView.findViewById(R.id.tv_value);
        tv_content = itemView.findViewById(R.id.tv_content);
    }

    void bind(POJOContent pojoContent){
        tv_value.setText(pojoContent.getKey());
        tv_content.setText(pojoContent.getContent());
    }
}

}

fragment 内容卡.xml 主 recyclerView View 的布局

    <?xml version="1.0" encoding="utf-8"?>
   <androidx.cardview.widget.CardView 
    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="wrap_content"
    android:layout_margin="8dp"
    android:padding="8dp">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/tv_Id"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="16dp"
            android:textSize="32sp"
            android:textColor="@color/black"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:text="ID" />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/rv_inner_list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="16dp"
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/tv_Id" />

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.cardview.widget.CardView>

item_inner_list.xml 内部 recylerVoews View 的布局

    <?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="wrap_content">

    <TextView
        android:id="@+id/tv_value"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="16dp"
        android:textColor="@color/black"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="value" />

    <TextView
        android:id="@+id/tv_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="8dp"
        android:textColor="@color/black"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tv_value"
        tools:text="content" />

</androidx.constraintlayout.widget.ConstraintLayout>