如何在回收站视图中使用列表视图？

Question

My data format is like this
{"foo1":"bar1","foo2":["bar2","bar3","bar4"]} ,{"foo1":"bar5","foo2":["bar6","bar7","bar8"]}

I'am using recyclerview for root object and want to use foo3 as listview in recyclerview. Is it possible and how?

Example of recyclerview list item layout

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/tvFoo1Value"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />


    <ListView
        android:id="@+id/lvFoo2Values"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

ViewHolder is like this

public class FooViewHolder extends RecyclerView.ViewHolder {
public final View mView;
public final TextView tvFoo1Value;
public final ListView lvFoo2Values;

public ChallengeViewHolder(View view) {
    super(view);
    mView = view;
    this.tvFoo1Value = (TextView) view.findViewById(R.id.tvFoo1Value);
    this.lvFoo2Values = (ListView) view.findViewById(R.id.lvFoo2Values);
}}

Also ViewAdapter is

public class FooRecyclerViewAdapter extends RecyclerView.Adapter<FooViewHolder> {
..
private View view;

  @Override
public FooViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    Context ctx = parent.getContext();
    view = LayoutInflater.from(ctx)
            .inflate(R.layout.foo_list_item, parent, false);

    return new FooViewHolder(view);
}
 @Override
public void onBindViewHolder(FooViewHolder holder, int position) {
    String[] foo2Arr = //comes from service

    Context ctx = view.getContext(); //?? possible error here i think

    ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(ctx,android.R.layout.simple_list_item_1,foo2Arr);
    holder.lvFoo2Values.setAdapter(listAdapter);
}
..
}

Answer 1

First, you'll need to convert that JSON into a java object. You could use any library for this (GSON, Jackson, etc.)

Your class will probably look like this

public class TheJSON {
    public String foo1;
    public ArrayList<String> foo2;
}

Once you get the JSON represented in Java objects, then use multiple view types in your RecyclerView adapter

public class TheAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private ArrayList<TheJSON> json_collection;
    private ArrayList<String> the_strings;
    private ArrayList<int> the_view_types;

    public TheAdapter(ArrayList<TheJSON> json_collection) {
        this.json_collection = json_collection;

        for (int i = 0; i < json_collection; i++) {
            the_string.add(json_collection.get(i).foo1);
            the_view_types.add(1);
            for (int j = 0; j < json_collection.get(i).foo2.size(); j++) {
                the_string.add(json_collection.get(i).foo2.get(j));
                the_view_types.add(2);
            }
        }
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType) {
            case 1:
                return new Foo1ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.foo1_layout, parent, false));

            case 2:
                return new Foo2ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.foo2_layout, parent, false));

            default:
                return null;
        }
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        switch (the_view_types.get(position)) {
            case 1:
                Foo1ViewHolder foo1ViewHolder = (Foo1ViewHolder) holder;
                foo1ViewHolder.setText(the_strings.get(position));
                break;

            case 2:
                Foo2ViewHolder foo2ViewHolder = (Foo2ViewHolder) holder;
                foo2ViewHolder.setText(the_strings.get(position));
                break;
        }
    }

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

    @Override
    public int getItemViewType(int position) {
        return the_view_types.get(position);
    }

    public class Foo1ViewHolder extends RecyclerView.ViewHolder {
        private TextView tvFoo1Value;

        public Foo1ViewHolder(View itemView) {
            super(itemView);
            tvFoo1Value = (TextView) itemView.findViewById(R.id.tvFoo1Value);
        }

        public setText(String text) {
            tvFoo1Value.setText(text);
        }
    }

    public class Foo2ViewHolder extends RecyclerView.ViewHolder {
        private TextView tvFoo2Value;

        public Foo2ViewHolder(View itemView) {
            super(itemView);
            tvFoo2Value = (TextView) itemView.findViewById(R.id.tvFoo2Value);
        }

        public setText(String text) {
            tvFoo2Value.setText(text);
        }
    }
}