JSONException：指數5超出範圍[0..5）

Question

我有一些麻煩的應用程序，現在我正在開發權

使用此JSON對象：http://api.worldweatheronline.com/premium/v1/marine.ashx?q=-34.8799074,174.7565664&key=3477e975c4d9a8a0eaac2b2c818f4&format=json&tide=yes

有些日子裏，它工作得很好，取來自JSON對象的數據沒有問題，有些日子我得到這樣的錯誤：JSONException：索引5超出範圍[0..5]。

12-04 11:12:30.328 1916-1931/android_kaizen.com.drawerskippermate E/FetchWeatherTask﹕ Index 5 out of range [0..5) 
org.json.JSONException: Index 5 out of range [0..5) 
     at org.json.JSONArray.get(JSONArray.java:263) 
     at org.json.JSONArray.getJSONObject(JSONArray.java:480) 
     at android_kaizen.com.drawerskippermate.MainActivity$FetchWeatherTask.getWeatherDataFromJson(MainActivity.java:579) 
     at android_kaizen.com.drawerskippermate.MainActivity$FetchWeatherTask.doInBackground(MainActivity.java:754) 
     at android_kaizen.com.drawerskippermate.MainActivity$FetchWeatherTask.doInBackground(MainActivity.java:318) 
     at android.os.AsyncTask$2.call(AsyncTask.java:287) 
     at java.util.concurrent.FutureTask.run(FutureTask.java:234) 
     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 
     at java.lang.Thread.run(Thread.java:864) 

甚至沒有更改一行代碼！ 奇怪的是，它可以在Web瀏覽器中看到JSON對象。

有沒有人遇到類似的情況，可以解釋爲什麼會發生？

Thx！

編輯：這是我的代碼：

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

     final String JSON_DATA = "data"; 
     final String JSON_WEATHER = "weather"; 
     final String JSON_MAX = "maxtempC"; 
     final String JSON_MIN = "mintempC"; 
     final String JSON_DATE = "date"; 
     final String JSON_ARRAY_HOURLY = "hourly"; 
     final String JSON_ARRAY_ASTRONOMY = "astronomy"; 
     final String JSON_ARRAY_TIDES = "tides"; 
     final int JSON_OBJECT_MORNING = 3; 
     final int JSON_OBJECT_MIDDAY = 4; 
     final int JSON_OBJECT_AFTERNOON = 5; 
     final String JSON_DESCRIPTION = "weatherDesc"; 


     // WeatherCode and description at midday 
     final String JSON_WEATHER_CODE = "weatherCode"; 
     final String JSON_WEATHER_DESCRIPTION = "weatherDesc"; 

     final String JSON_TEMP = "tempC"; 
     final String JSON_PRECIPITATION = "precipMM"; 
     final String JSON_CLOUD_COVER = "cloudcover"; 
     final String JSON_VISIBILITY = "visibility"; 
     final String JSON_SUNRISE = "sunrise"; 
     final String JSON_SUNSET = "sunset"; 
     final String JSON_PRESSURE = "pressure"; 
     final String JSON_WIND_DIRECTION = "winddir16Point"; 
     final String JSON_WIND_SPEED = "windspeedKmph"; 
     final String JSON_WIND_GUST = "WindGustKmph"; 
     final String JSON_WATER_TEMP = "waterTemp_C"; 
     final String JSON_SWELL_DIRECTION = "swellDir16Point"; 
     final String JSON_SWELL_HEIGHT = "swellHeight_m"; 
     final String JSON_TIDE = "tideTime"; 


     JSONObject forecastJson = new JSONObject(forecastJsonStr); 
     JSONArray weatherArray = forecastJson.getJSONObject(JSON_DATA).getJSONArray(JSON_WEATHER); 

     int numDays = weatherArray.length(); 

     mDayForecastArray = new DayForecast[numDays]; 


     for (int i = 0; i < weatherArray.length(); i++) { 

      String day; 
      String description; 
      String highAndLow; 





      JSONObject dayForecast = weatherArray.getJSONObject(i); 

      String dateTime = dayForecast.getString(JSON_DATE); 
      day = getReadableDateString(dateTime); 

      // Get the right JsonObject for different time of the day 
      JSONObject morningObject = dayForecast.getJSONArray(JSON_ARRAY_HOURLY).getJSONObject(JSON_OBJECT_MORNING); 
      JSONObject midDayObject = dayForecast.getJSONArray(JSON_ARRAY_HOURLY).getJSONObject(JSON_OBJECT_MIDDAY); 
      JSONObject afternoonObject = dayForecast.getJSONArray(JSON_ARRAY_HOURLY).getJSONObject(JSON_OBJECT_AFTERNOON); 

      /** 
      * Common Conditions. 
      */ 
      // Parse the two midday values from Json to variables 


      /** 
      * Morning Conditions. 
      */ 


      description = midDayObject.getJSONArray(JSON_DESCRIPTION).getJSONObject(0).getString("value"); 

      int high = dayForecast.getInt(JSON_MAX); 
      int low = dayForecast.getInt(JSON_MIN); 
      highAndLow = formatHighLows(high, low); 


      DayForecast dayForecastObject = new DayForecast(); 
      dayForecastObject.setmDate(day); 

      dayForecastObject.setmDescription(description); 


      dayForecastObject.setmWeatherCode(afternoonObject.getInt(JSON_WEATHER_CODE)); 
      dayForecastObject.setmWeatherDescription(afternoonObject.getJSONArray(JSON_DESCRIPTION).getJSONObject(0).getString("value")); 
      dayForecastObject.setmTempMax(convertCelsiusToFahrenheit(dayForecast.getInt(JSON_MAX))); 
      dayForecastObject.setmTempMin(dayForecast.getInt(JSON_MIN)); 
      /** 
      * Morning Conditions. 
      */ 
      dayForecastObject.setmPrecipitationAM(convertmillimetersToInches(morningObject.getInt(JSON_PRECIPITATION))); 
      dayForecastObject.setmCloudCoverAM(morningObject.getInt(JSON_CLOUD_COVER)); 
      dayForecastObject.setmVisibilityAM(convertKilometersToMiles(morningObject.getInt(JSON_VISIBILITY))); 
      dayForecastObject.setmSunrise(dayForecast.getJSONArray(JSON_ARRAY_ASTRONOMY).getJSONObject(0).getString(JSON_SUNRISE)); 

      dayForecastObject.setmPressureAM(morningObject.getInt(JSON_PRESSURE)); 
      dayForecastObject.setmWindSpeedAM(convertKilometersToMiles(morningObject.getInt(JSON_WIND_SPEED))); 
      dayForecastObject.setmWindGustAM(convertKilometersToMiles(morningObject.getInt(JSON_WIND_GUST))); 
      dayForecastObject.setmWindDirectionAM(morningObject.getString(JSON_WIND_DIRECTION)); 

      dayForecastObject.setmWaterTempAM(convertCelsiusToFahrenheit(morningObject.getInt(JSON_WATER_TEMP))); 
      dayForecastObject.setmSwellHeightAM(convertMetersToFeet(Float.parseFloat(morningObject.getString(JSON_SWELL_HEIGHT)))); 
      dayForecastObject.setmSwellDirectionAM(morningObject.getString(JSON_SWELL_DIRECTION)); 
      dayForecastObject.setmTide1AM(getReadableTide(dayForecast, 0)); 
      dayForecastObject.setmTide2AM(getReadableTide(dayForecast, 1)); 

      /** 
      * Afternoon Conditions. 
      */ 
      dayForecastObject.setmPrecipitationPM(convertmillimetersToInches(afternoonObject.getInt(JSON_PRECIPITATION))); 
      dayForecastObject.setmCloudCoverPM(afternoonObject.getInt(JSON_CLOUD_COVER)); 
      dayForecastObject.setmVisibilityPM(convertKilometersToMiles(afternoonObject.getInt(JSON_VISIBILITY))); 
      dayForecastObject.setmSunset(dayForecast.getJSONArray(JSON_ARRAY_ASTRONOMY).getJSONObject(0).getString(JSON_SUNSET)); 

      dayForecastObject.setmPressurePM(afternoonObject.getInt(JSON_PRESSURE)); 
      dayForecastObject.setmWindSpeedPM(convertKilometersToMiles(afternoonObject.getInt(JSON_WIND_SPEED))); 
      dayForecastObject.setmWindGustPM(convertKilometersToMiles(afternoonObject.getInt(JSON_WIND_GUST))); 
      dayForecastObject.setmWindDirectionPM(afternoonObject.getString(JSON_WIND_DIRECTION)); 

      dayForecastObject.setmWaterTempPM(convertCelsiusToFahrenheit(afternoonObject.getInt(JSON_WATER_TEMP))); 
      dayForecastObject.setmSwellHeightPM(convertMetersToFeet(Float.parseFloat(afternoonObject.getString(JSON_SWELL_HEIGHT)))); 
      dayForecastObject.setmSwellDirectionPM(afternoonObject.getString(JSON_SWELL_DIRECTION)); 
      dayForecastObject.setmTide1PM(getReadableTide(dayForecast, 2)); 
      dayForecastObject.setmTide2PM(getReadableTide(dayForecast, 3)); 


      mDayForecastArray[i] = dayForecastObject; 
     } 
     for (DayForecast s : mDayForecastArray) { 
      Log.v(LOG_TAG, "Forecast entry: " + s.getmDescription() + "/" + String.valueOf(s.getmWeatherCode())); 
     } 

     return mDayForecastArray; 

    } 

Answer 1

I'm很肯定你有類似的問題： JSONArray Exception : Index 50 out of range [0..50). Is there any limit on JsonArray

您上傳.json響應中的對象的數量每天都會發生變化，你必須定義邊界（results.length()）：

見下面的例子：

JSONArray results = jsonResponse.getJSONArray("results"); 
final int numberOfItemsInResp = results.length(); 
for (int i = 0; i < numberOfItemsInResp; i++){ 
    JSONObject perResult = results.getJSONObject(i); 
}