如何在android recyclerview中从服务器访问json文件的childs和子childs

// 1. 创建网络请求类
public class NetworkUtils {
    public static String fetchDataFromServer(String url) throws IOException {
        // 发送网络请求并获取服务器响应
        HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
        connection.setRequestMethod("GET");
        connection.connect();

        // 读取服务器响应
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        StringBuilder response = new StringBuilder();
        String line;
        while ((line = reader.readLine()) != null) {
            response.append(line);
        }
        reader.close();

        return response.toString();
    }
}

// 2. 解析JSON数据
public class JsonParser {
    public static List<Item> parseJson(String json) throws JSONException {
        List<Item> itemList = new ArrayList<>();

        JSONArray jsonArray = new JSONArray(json);
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject itemJson = jsonArray.getJSONObject(i);
            String itemName = itemJson.getString("name");

            // 获取子项数据
            JSONArray childArray = itemJson.getJSONArray("childs");
            List<ChildItem> childItemList = new ArrayList<>();
            for (int j = 0; j < childArray.length(); j++) {
                JSONObject childJson = childArray.getJSONObject(j);
                String childName = childJson.getString("name");

                // 获取子子项数据
                JSONArray subChildArray = childJson.getJSONArray("subchilds");
                List<SubChildItem> subChildItemList = new ArrayList<>();
                for (int k = 0; k < subChildArray.length(); k++) {
                    JSONObject subChildJson = subChildArray.getJSONObject(k);
                    String subChildName = subChildJson.getString("name");
                    // 解析其他字段...

                    SubChildItem subChildItem = new SubChildItem(subChildName);
                    subChildItemList.add(subChildItem);
                }

                ChildItem childItem = new ChildItem(childName, subChildItemList);
                childItemList.add(childItem);
            }

            Item item = new Item(itemName, childItemList);
            itemList.add(item);
        }

        return itemList;
    }
}

// 3. 创建数据模型类
public class Item {
    private String name;
    private List<ChildItem> childItemList;

    public Item(String name, List<ChildItem> childItemList) {
        this.name = name;
        this.childItemList = childItemList;
    }

    // getter和setter方法...
}

public class ChildItem {
    private String name;
    private List<SubChildItem> subChildItemList;

    public ChildItem(String name, List<SubChildItem> subChildItemList) {
        this.name = name;
        this.subChildItemList = subChildItemList;
    }

    // getter和setter方法...
}

public class SubChildItem {
    private String name;

    public SubChildItem(String name) {
        this.name = name;
    }

    // getter和setter方法...
}

// 4. 在适配器中绑定数据
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
    private List<Item> itemList;

    public RecyclerViewAdapter(List<Item> itemList) {
        this.itemList = itemList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // 创建ViewHolder并关联相应的布局文件
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        // 将数据绑定到视图上
        Item item = itemList.get(position);
        holder.itemNameTextView.setText(item.getName());

        // 绑定子项数据
        List<ChildItem> childItemList = item.getChildItemList();
        ChildRecyclerViewAdapter childAdapter = new ChildRecyclerViewAdapter(childItemList);
        holder.childRecyclerView.setAdapter(childAdapter);
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView itemNameTextView;
        RecyclerView childRecyclerView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            itemNameTextView = itemView.findViewById(R.id.item_name_text_view);
            childRecyclerView = itemView.findViewById(R.id.child_recycler_view);
        }
    }
}

public class ChildRecyclerViewAdapter extends RecyclerView.Adapter<ChildRecyclerViewAdapter.ViewHolder> {
    private List<ChildItem> childItemList;

    public ChildRecyclerViewAdapter(List<ChildItem> childItemList) {
        this.childItemList = childItemList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // 创建ViewHolder并关联相应的布局文件
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.child_item_layout, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        // 将数据绑定到视图上
        ChildItem childItem = childItemList.get(position);
        holder.childNameTextView.setText(childItem.getName());
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView childNameTextView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            childNameTextView = itemView.findViewById(R.id.child_name_text_view);
        }
    }
}

// 5. 在Activity中使用RecyclerView
public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private RecyclerViewAdapter adapter;

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

        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        // 从服务器获取JSON数据
        try {
            String json = NetworkUtils.fetchDataFromServer("http://example.com/data.json");
            List<Item> itemList = JsonParser.parseJson(json);

            adapter = new RecyclerViewAdapter(itemList);
            recyclerView.setAdapter(adapter);
        } catch (IOException | JSONException e) {
            e.printStackTrace();
        }
    }
}