Fehler beim Analysieren der JSON-Ausgabe von Google-Orten API

Question

Ich versuche, die JSON-Ausgabe nach einem erfolgreichen JSON-Abruf mit der Google Places-API zu analysieren, obwohl der Code keinen Fehler zeigt und ich nicht einmal die geparste Antwort bekomme. Hier ist der JSON-Parsing-Code, um es in einer Listenansicht zu zeigen.

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.widget.ListView; 
import android.widget.Toast; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

public class DisplayListView extends AppCompatActivity { 

JSONObject jsonObject; 
JSONArray jsonArray; 
HotelAdapter hotelAdapter; 
ListView listView; 

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

    this.JSONSTR=getIntent().getStringExtra("JSONmsg"); 
    Toast.makeText(getApplicationContext(),JSONSTR,Toast.LENGTH_SHORT).show(); 

    listView=(ListView)findViewById(R.id.HotelListView); 

    hotelAdapter=new HotelAdapter(this,R.layout.row_layout); 

    listView.setAdapter(hotelAdapter); 

    try { 
     jsonObject=new JSONObject(JSONSTR); 
     jsonArray=jsonObject.getJSONArray("results"); 
     int count=0; 

     String name,rating,types,vicinity; 

     while (count<jsonArray.length()){ 
      JSONObject jo=jsonArray.getJSONObject(count); 
      name=jo.getString("name"); 
      rating=jo.getString("rating"); 
      types=jo.getJSONArray("types").toString(); 
      vicinity=jo.getString("vicinity"); 

      Hotels hotels=new Hotels(name,rating,types,vicinity); 
      hotelAdapter.add(hotels); 
      count++; 
     } 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 

} 

}

und die entsprechenden JSON-Code holen ist ->

import android.Manifest; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.ActivityCompat; 
import android.support.v4.content.ContextCompat; 
import android.support.v7.app.AppCompatActivity; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.google.android.gms.common.ConnectionResult; 
import com.google.android.gms.common.api.GoogleApiClient; 
import com.google.android.gms.common.api.PendingResult; 
import com.google.android.gms.common.api.ResultCallback; 
import com.google.android.gms.location.places.PlaceLikelihood; 
import com.google.android.gms.location.places.PlaceLikelihoodBuffer; 
import com.google.android.gms.location.places.Places; 

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; 

public class Hotel_lists extends AppCompatActivity { 
    String jsonStr,JSONSTR; 
    JSONObject jsonObject; 
    JSONArray jsonArray; 
    HotelAdapter hotelAdapter; 
    ListView listView; 

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

} 

public void getJson(View view){ 
    new BackTask().execute(); 

} 

class BackTask extends AsyncTask<Void,Void,String>{ 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     jsonStr="https://maps.googleapis.com/maps/api/place/radarsearch/json?location=20.296059,85.824540&radius=500&type=hotel&key=mykey"; 

    } 
    @Override 
    protected String doInBackground(Void... voids) { 
     try { 
      URL url=new URL(jsonStr); 
      HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection(); 
      InputStream inputStream=httpURLConnection.getInputStream(); 
      BufferedReader bufferedReader=new BufferedReader((new InputStreamReader(inputStream))); 

      StringBuilder stringBuilder=new StringBuilder(); 
      while((jsonStr = bufferedReader.readLine())!=null){ 
       stringBuilder.append(jsonStr); 

      } 
      bufferedReader.close(); 
      inputStream.close(); 
      httpURLConnection.disconnect(); 
      return stringBuilder.toString().trim(); 
     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

    @Override 
    protected void onProgressUpdate(Void... values) { 
     super.onProgressUpdate(values); 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     super.onPostExecute(result); 
     TextView textView=(TextView)findViewById(R.id.locText); 
     textView.setText(result); 
     JSONSTR=result; 
     Toast.makeText(getApplicationContext(),JSONSTR,Toast.LENGTH_SHORT).show(); 
    } 
} 

public void parseJson(View view){ 
    if(JSONSTR==null){ 
     Toast.makeText(getApplicationContext(),"error gettingg result",Toast.LENGTH_SHORT).show(); 

    } 
    else{ 
     Toast.makeText(getApplicationContext()," gettingg result",Toast.LENGTH_SHORT).show(); 
     Intent intent=new Intent(this,DisplayListView.class); 

     intent.putExtra("JSONmsg",JSONSTR.trim()); 
     startActivity(intent); 

    } 
} 

}

Hier ist die JSON-Antwort ..

{ 
    "html_attributions" : [], 
    "next_page_token" : "CqQCGwEAAHzgWjXXoyd7FnMd3tjkgYMbo4quo3d4CZlw_HLR6yLWPbo929niHRbwAW-Ma-DaB-iqsTydif_5ggetITyGHy1jvP3r1zwD4RHdKQRYDdh8lk7wU0kiCTxp_xo9vnnrhD-Ku0LJ3ljI9Q89yvJRmFwG53opXjD1JIXd3QhWA69zUw_Dp8CvF4YJbmijDL3CKDpWRSFYRHYsOxVo8wX5ZNDBA-0JZMEeJiS77a3KsH-5miVgyHzfdbovhEctP9Yv8fvdOW1ugBWTyCpE8tdXIAIGsVpUhYmf0FE-A99LlblrttGSiVkrWCw0bXO_tyY0O_KDA-mBavlNJnDexOH3atvQz6xaMJixjwLfrzLkSA1LPc2A8EN0Q6eTB-PjOoRgRxIQqNzXJZnQ13QQebkTSF1GiBoUusO5z_TqyZlClWBh71nydS6A2gA", 
    "results" : [ 
     { 
     "geometry" : { 
      "location" : { 
       "lat" : 22.572646, 
       "lng" : 88.36389500000001 
      }, 
      "viewport" : { 
       "northeast" : { 
        "lat" : 22.5739949802915, 
        "lng" : 88.36524398029151 
       }, 
       "southwest" : { 
        "lat" : 22.5712970197085, 
        "lng" : 88.3625460197085 
       } 
      } 
     }, 
     "icon" : "https://maps.gstatic.com/mapfiles/place_api/icons/restaurant-71.png", 
     "id" : "ab3c682ca2e068c91d806c8a443b5f7bd45145aa", 
     "name" : "Sugar & Spice", 
     "opening_hours" : { 
      "open_now" : true, 
      "weekday_text" : [] 
     }, 
     "photos" : [ 
      { 
       "height" : 480, 
       "html_attributions" : [ 
        "\u003ca href=\"https://maps.google.com/maps/contrib/104833748119464497887/photos\"\u003eSugar & Spice\u003c/a\u003e" 
       ], 
       "photo_reference" : "CmRaAAAAa7VFOzF-sjipV8a4qyD8B6v31XOwgT91SLLOmGLNVRHcWNhkhPNeOp1fTdH8yWUjhtaNEcAmnYg3G7LBI_BGeb2sVLMqNc4JH1xolP7_x8oLKkmo5XKJBtQ3-2kc7-ZIEhBUdWsuWoprBvTAfkL1_cj_GhRknB1JQe1eCTZjUNOpPdde_AV1EA", 
       "width" : 640 
      } 
     ], 
     "place_id" : "ChIJe6yzIVN2AjoRpnq6Ojv2HoM", 
     "rating" : 3.2, 
     "reference" : "CmRSAAAA8t4Ry-gd5HGWXZ7tN9wQNGC09gB4izm0nP1s-EGIdrbcAjCXQ7WTNzdbP2mC-x56ns8P0_19u0dIbNqk_-hCB0yYvjBL6OMx2HHAmejK8KbGDs3MGa1wiG_f6TiKAKs4EhD07l9cCpEERshxnRZGzaeqGhRDo92OY4kXdzuKRR-vMgaKjxBU7g", 
     "scope" : "GOOGLE", 
     "types" : [ "restaurant", "food", "point_of_interest", "establishment" ], 
     "vicinity" : "78/B, Acharya Prafulla Chandra Road, Sealdah, Baithakkhana, Kolkata" 
     }, 

so helfen Sie mir bitte den Fehler als Android-Studio, um herauszufinden, zeigt nichts, obwohl ich versichern kann, dass ich erfolgreich JSON holen, habe aber letztlich bin ich um das Endergebnis zu zeigen ..

Answer 1

So hast du nicht nicht in der Lage benannte notifyDatasetChanged() nach dem Hinzufügen von Daten zu Ihrem Dataset? Tun Sie das und sehen Sie es funktioniert oder nicht bitte.