如果项目来自json字符串，则RecyclerView不会显示这些项目

[
    {"id": 1, "name": "Item 1"},
    {"id": 2, "name": "Item 2"},
    {"id": 3, "name": "Item 3"}
]

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;
import java.util.List;

public class JsonUtils {
    public static List<Item> parseJson(String jsonString) {
        Gson gson = new Gson();
        Type type = new TypeToken<List<Item>>(){}.getType();
        return gson.fromJson(jsonString, type);
    }
}

class Item {
    int id;
    String name;

    public Item(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }
}

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;

public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ItemViewHolder> {
    private List<Item> itemList;

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

    @NonNull
    @Override
    public ItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new ItemViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ItemViewHolder holder, int position) {
        Item item = itemList.get(position);
        holder.textView.setText(item.getName());
    }

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

    static class ItemViewHolder extends RecyclerView.ViewHolder {
        TextView textView;

        ItemViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
        }
    }
}

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private ItemAdapter adapter;

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

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

        String jsonString = "[{\"id\": 1, \"name\": \"Item 1\"}, {\"id\": 2, \"name\": \"Item 2\"}, {\"id\": 3, \"name\": \"Item 3\"}]";
        List<Item> itemList = JsonUtils.parseJson(jsonString);

        adapter = new ItemAdapter(itemList);
        recyclerView.setAdapter(adapter);
    }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</RelativeLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="18sp" />
</LinearLayout>