AsycTaskで文字列配列を返すことができません

Question

文字列に変更すると文字列値が返されます。しかし、私はそれが文字列の値を返していない理由を把握することはできません。私はまだそれを得ることができないすべてをチェックします。

私の間違いはどこですか？前もって感謝します。

public class FetchWeatherTask extends AsyncTask<String, Void, String[]> { 
private final String LOG_TAG=FetchWeatherTask.class.getSimpleName(); 

private String[] getWeatherDataFromJson(String forecastJsonStr) 
      throws JSONException { 

     // These are the names of the JSON objects that need to beextracted. 
final String OWM_LIST = "list"; 
final String OWM_WEATHER = "weather"; 
final String OWM_TEMPERATURE = "temp"; 
final String OWM_MAX = "temp_max"; 
final String OWM_MIN = "temp_min"; 
final String OWM_DESCRIPTION = "main"; 

JSONObject forecastJson = new JSONObject(forecastJsonStr); 
JSONArray weatherArray = forecastJson.getJSONArray(OWM_LIST); 
JSONObject city=forecastJson.getJSONObject("city"); 
String name=city.getString("name"); 

String[] resultStrs = null; 
for(int i = 0; i < weatherArray.length(); i++) { 
    // For now, using the format "Day, description, hi/low" 
String description; 

JSONObject weatherObject=dayForecast.getJSONArray(OWM_WEATHER).getJSONObject(0); 
description = weatherObject.getString(OWM_DESCRIPTION); 

      // Temperatures are in a child object called "temp". Try not to name variables 
      // "temp" when working with temperature. It confuses everybody. 
      JSONObject temperatureObject = dayForecast.getJSONObject(OWM_DESCRIPTION); 
      double high = temperatureObject.getDouble(OWM_MAX); 
      double low = temperatureObject.getDouble(OWM_MIN); 

      highAndLow = formatHighLows(high, low); 
      //resultStrs[i] = description + " - " + highAndLow; 
      resultStrs[i]=name; 
     } 

     for (String s : resultStrs) { 
      Log.v(LOG_TAG, "Forecast entry: " + s); 
     } 
     return resultStrs; 


    } 

文字列でもdoinbackground []

@Override 
    protected String[] doInBackground(String... params) { 


     //if there is no zip code nothing to look it 
     if (params.length == 0) { 

      return null; 

     } 

     // These two need to be declared outside the try/catch 
     // so that they can be closed in the finally block. 
     HttpURLConnection urlConnection = null; 
     BufferedReader reader = null; 

     // Will contain the raw JSON response as a string. 
     String forecastJsonStr = null; 
     String appid = "bc1"; 


     try { 
      // Construct the URL for the OpenWeatherMap query 
      // Possible parameters are available at OWM's forecast API page, at 
      // http://openweathermap.org/API#forecast 
      final String FORECAST_BASE_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?"; 
      final String QUERY_PARAM = "id"; 
      final String APPID = "APPID"; 


      Uri builturi = Uri.parse(FORECAST_BASE_URL).buildUpon() 
        .appendQueryParameter(QUERY_PARAM, params[0]) 
        .appendQueryParameter(APPID, appid) 
        .build(); 
      URL URl; 
      URl = new URL(builturi.toString()); 
      Log.v(LOG_TAG, "BUILT URI" + builturi.toString()); 


      // URL url = new URL("http://api.openweathermap.org/data/2.5/forecast/city?id=524901&APPID=bc16214cbb434f8386d9b0c3d7eebc17"); 

      // Create the request to OpenWeatherMap, and open the connection 
      urlConnection=(HttpURLConnection) URl.openConnection(); 
      urlConnection.setRequestMethod("GET"); 
      urlConnection.connect(); 

      // Read the input stream into a String 
      InputStream inputStream = urlConnection.getInputStream(); 
      StringBuffer buffer = new StringBuffer(); 
      if (inputStream == null) { 
       // Nothing to do. 
       forecastJsonStr = null; 

      } 
      reader = new BufferedReader(new InputStreamReader(inputStream)); 

      String line; 
      while ((line = reader.readLine()) != null) { 
       // Since it's JSON, adding a newline isn't necessary (it won't affect parsing) 
       // But it does make debugging a *lot* easier if you print out the completed 
       // buffer for debugging. 
       buffer.append(line + "\n"); 
      } 

      if (buffer.length() == 0) { 
       // Stream was empty. No point in parsing. 
       forecastJsonStr = null; 
      } 
      if (buffer.length()!=0){forecastJsonStr = buffer.toString();} 

     } catch (ProtocolException e) { 
      e.printStackTrace(); 
     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      Log.e("PlaceholderFragment", "Error ", e); 
      // If the code didn't successfully get the weather data, there's no point in attempting 
      // to parse it. 
      //forecastJsonStr = null; 
     } finally { 
      if (urlConnection != null) { 
       urlConnection.disconnect(); 
      } 
      if (reader != null) { 
       try { 
        reader.close(); 
       } catch (final IOException e) { 
        Log.e("PlaceholderFragment", "Error closing stream", e); 
       } 
      } 

     } 
     try { 
      return getWeatherDataFromJson(forecastJsonStr); 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 
     //this will happen if there was an error getting or parsing the document 
     return null; 
    } 

    @Override 
    protected void onPostExecute(String[] result) { 
     if (result!=null){ 
      Toast.makeText(getActivity(),"working", Toast.LENGTH_LONG).show(); 
      arrayAdapter.clear(); 
      for (String dayforcast:result){ 
       arrayAdapter.add(dayforcast); 
      } 
     } 
    //i used to figure out it is working or not 
    // not much significance 
if (result==null){ 
Toast.makeText(getActivity(),"not working", Toast.LENGTH_LONG).show(); 
     } 
    } 
} 
    //Onpost in string[],asyctask also string[],dolnbackground also string[] 

Answer 1

あなたが追加した後、あなたのdayforcast要素;-)