僅當我安裝APK時發生錯誤

我在udacity教程：https://classroom.udacity.com/courses/ud853後有一個簡單的應用程序。源代碼在這裏：https://github.com/ionutincau/Vremea。僅當我安裝APK時發生錯誤

如果我通過USB調試模式（在Android Studio中運行選項）安裝應用程序，它工作正常，但如果我「構建APK」並安裝構建的apk，應用程序崩潰。

我有互聯網連接，但是當我嘗試從http://api.openweathermap.org獲取數據時，我收到了URL Connection Error java.io.FileNotFoundException。而且，當我嘗試打開設置，我得到：

FATAL EXCEPTION: main 
Process: com.example.ionut.vremea2, PID: 6850 
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.ionut.vremea2/com.example.ionut.vremea2.SettingsActivity}: java.lang.IllegalAccessException:

只有安裝從apk文件的應用程序，我得到了錯誤

SettingsActivity

class SettingsActivity extends Activity { 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_settings); 
    } 
}

我使用此代碼從網上獲取數據：

protected String[] doInBackground(String... params) { 
     if (params.length == 0) { 
      return null; 
     } 

     HttpURLConnection urlConnection = null; 
     BufferedReader reader = null; 
     String forecastJsonStr = null; 

     String format = "json"; 
     String units = "metric"; 
     int numDays = 7; 
     String api_key = "my_key"; // I have a valid code in my app 

     try { 
      // Construct the URL for the OpenWeatherMap query 
      final String FORECAST_BASE_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?"; 
      final String QUERY_PARAM = "id"; 
      final String FORMAT_PARAM = "mode"; 
      final String UNITS_PARAM = "units"; 
      final String DAYS_PARAM = "cnt"; 
      final String APPID_PARAM = "APPID"; 

      // Construct the URL for the OpenWeatherMap query 
      Uri builtUri = Uri.parse(FORECAST_BASE_URL).buildUpon() 
        .appendQueryParameter(QUERY_PARAM, params[0]) 
        .appendQueryParameter(FORMAT_PARAM, format) 
        .appendQueryParameter(UNITS_PARAM, units) 
        .appendQueryParameter(DAYS_PARAM, Integer.toString(numDays)) 
        .appendQueryParameter(APPID_PARAM, api_key) 
        .build(); 

      URL url = new URL(builtUri.toString()); 

      // 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(); 
      // ... do something

來源

2016-12-06 WhiteShadow

顯示相關代碼。 –

源代碼在這裏：https：//github.com/ionutincau/Vremea。 – WhiteShadow

該pro因爲你需要公開他們的課程，所以創建這些活動是不明智的。

public class SettingsActivity extends Activity { 
}

對於filenotfound你可以打開瀏覽器中的鏈接，看到了實際的迴應： {「鱈魚」：「502」，「消息」：「錯誤：未找到城市」}

您需要將其配置爲獲得正確的響應，但您也應該通過針對HttpURLConnection.HTTP_OK檢查urlConnection.getResponseCode（）來處理錯誤響應。如果發生故障，您可以在urlConnection.getResponseMessage（）或流urlConnection.getErrorStream（）上獲得更多信息。

if (urlConnection.getResposeCode() == HttpURLConnection.HTTP_OK) { 
... 
} else { 
... 
}

來源

2016-12-07 16:13:25 petrumo

僅當我安裝APK時發生錯誤

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