如何从Json文件URL填充Android微调器

<uses-permission android:name="android.permission.INTERNET"/>

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

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

public class Item {
    private String name;

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

    public String getName() {
        return name;
    }
}

import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import androidx.appcompat.app.AppCompatActivity;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private Spinner spinner;

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

        spinner = findViewById(R.id.spinner);
        new FetchDataTask().execute("https://example.com/data.json");
    }

    private class FetchDataTask extends AsyncTask<String, Void, List<Item>> {

        @Override
        protected List<Item> doInBackground(String... urls) {
            HttpURLConnection urlConnection = null;
            BufferedReader reader = null;
            List<Item> items = new ArrayList<>();

            try {
                URL url = new URL(urls[0]);
                urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setRequestMethod("GET");
                urlConnection.connect();

                InputStream inputStream = urlConnection.getInputStream();
                StringBuilder buffer = new StringBuilder();
                if (inputStream == null) {
                    return null;
                }
                reader = new BufferedReader(new InputStreamReader(inputStream));

                String line;
                while ((line = reader.readLine()) != null) {
                    buffer.append(line).append("\n");
                }

                if (buffer.length() == 0) {
                    return null;
                }

                String jsonString = buffer.toString();
                JSONArray jsonArray = new JSONArray(jsonString);
                for (int i = 0; i < jsonArray.length(); i++) {
                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                    String name = jsonObject.getString("name");
                    items.add(new Item(name));
                }
            } catch (IOException | JSONException e) {
                e.printStackTrace();
            } finally {
                if (urlConnection != null) {
                    urlConnection.disconnect();
                }
                if (reader != null) {
                    try {
                        reader.close();
                    } catch (final IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return items;
        }

        @Override
        protected void onPostExecute(List<Item> items) {
            if (items != null) {
                ArrayAdapter<Item> adapter = new ArrayAdapter<>(MainActivity.this,
                        android.R.layout.simple_spinner_item, items);
                adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                spinner.setAdapter(adapter);
            }
        }
    }
}