android省市区json数据下载

import android.os.AsyncTask;
import android.util.Log;

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;

public class FetchJsonTask extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... urls) {
        try {
            URL url = new URL(urls[0]);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            InputStream inputStream = connection.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            StringBuilder result = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                result.append(line);
            }
            reader.close();
            return result.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        if (result != null) {
            try {
                JSONArray jsonArray = new JSONArray(result);
                for (int i = 0; i < jsonArray.length(); i++) {
                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                    String province = jsonObject.getString("province");
                    JSONArray citiesArray = jsonObject.getJSONArray("cities");
                    for (int j = 0; j < citiesArray.length(); j++) {
                        JSONObject cityObject = citiesArray.getJSONObject(j);
                        String city = cityObject.getString("city");
                        Log.d("FetchJsonTask", "Province: " + province + ", City: " + city);
                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }
}

new FetchJsonTask().execute("https://example.com/api/regions.json");