android json parse

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ListView;

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.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class Main3Activity extends AppCompatActivity {
    private ListView listView;
    String JsonFile;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        listView = (ListView)findViewById(R.id.list_view);
        JsonTask jsonTask = new JsonTask();
        jsonTask.execute();
    }

    public class JsonTask extends AsyncTask<String,String, List<DataDemo>>{

        @Override
        protected  List<DataDemo> doInBackground(String... strings) {

            HttpURLConnection httpURLConnection = null;
            BufferedReader bufferedReader = null;

            try {
                URL url = new URL("https://gis.taiwan.net.tw/XMLReleaseALL_public/scenic_spot_C_f.json");
                httpURLConnection = (HttpURLConnection) url.openConnection();
                httpURLConnection.connect();
                InputStream inputStream = httpURLConnection.getInputStream();
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuffer stringBuffer = new StringBuffer();
                String line ="";
                while ((line=bufferedReader.readLine())!=null){
                    stringBuffer.append(line);
                }
                JsonFile = stringBuffer.toString();
                JSONObject firstObject = new JSONObject(JsonFile);
                JSONArray getArray = firstObject.getJSONObject("XML_Head").getJSONObject("Infos").getJSONArray("Info");
                List<DataDemo> DataList = new ArrayList<>();
                for (int i = 0;i<getArray.length();i++){
                    JSONObject ArrayObject = getArray.getJSONObject(i);
                    DataDemo data = new DataDemo();
                    String a = ArrayObject.getString("Add");
                    if(a.charAt(0)=='台'&& a.charAt(1)=='東'){
                        data.setName(ArrayObject.getString("Name"));
                        data.setTel(ArrayObject.getString("Tel"));
                        data.setAdd(ArrayObject.getString("Add"));
                        DataList.add(data);
                    }
                }
                return DataList;

                //return stringBuffer.toString();


            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            } finally {

                try {
                    httpURLConnection.disconnect();
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }


            return null;
        }

        @Override
        protected void onPostExecute(List<DataDemo> s) {
            super.onPostExecute(s);

            CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(),R.layout.simple,s);
            listView.setAdapter(customAdapter);


        }
    }

}