服務函數onLocationChanged（）在AsyncTask中返回0.0座標

在我的android應用程序中有一個服務和一個asynctask。我用POSTDATA的AsyncTask將數據發送到服務器在幾個方面：被以下建設MainActivity服務函數onLocationChanged（）在AsyncTask中返回0.0座標

手冊方法：改變是在用戶的位置時

protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 

    //10_06_2013 
    //Останавливаем наш сервис определения координат 
    Intent intentstop = new Intent(this,GPSTracker.class); 
    stopService(intentstop); 
Toast.makeText(getApplicationContext(), "service STOP", Toast.LENGTH_LONG).show(); //Test 
    //Стартуем наш сервис определения координат 
    Intent intentstart = new Intent(this,GPSTracker.class); 
    startService(intentstart); 
Toast.makeText(getApplicationContext(), "service START", Toast.LENGTH_LONG).show(); //Test 
    // Gets the user's network preference settings 
    SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this); 
    //Здесь берутся из настроек Параметры отвечающие за позиционирования разрешено или нет 
    Boolean GPSnotif = sharedPrefs.getBoolean("location_share_enordis", true); 
    //проверяем наличие файла если его нет то координаты не отправляются 12_06_2013 //______This block work 
    String FILELOGIN = "TeleportSAASUser.txt"; 
    File filelogin = getBaseContext().getFileStreamPath(FILELOGIN); 
    if (filelogin.exists()) { 
    //______This block work 

    if (GPSnotif.equals(true)) { 
     GPSdetermination(); 
     new PostData(gps, RD, getBaseContext()).execute(); 
     Toast.makeText(getApplicationContext(), R.string.location_send_toast, Toast.LENGTH_LONG).show(); 
    } 
    else { 
     Toast.makeText(getApplicationContext(), R.string.share_location_NO, Toast.LENGTH_LONG).show(); 
    } 
    } 
    else { 
     Toast.makeText(getApplicationContext(), R.string.check_user_profile_toast, Toast.LENGTH_LONG).show(); 
    } 

}

自動的方法OnLocationChanged我GPSTracker類

public class GPSTracker extends Service implements LocationListener { 
private final Context mContext; 

//определяем переменную главного активити 
    MainActivity ma; 
    GPSTracker gps; 
    Teleport_user_profile_activity UP; 
    ReadData RD; 
    PostData PD; 
    Context rdContext; 

// flag for GPS status 
boolean isGPSEnabled = false; 

// flag for network status 
boolean isNetworkEnabled = false; 

// flag for GPS status 
boolean canGetLocation = false; 

Location location; // location 
double latitude; // latitude 
double longitude; // longitude 

// The minimum distance to change Updates in meters 
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters 

// The minimum time between updates in milliseconds 
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 0;; // 0 minute 

// Declaring a Location Manager 
protected LocationManager locationManager; 

public GPSTracker(Context context) { 
    this.mContext = context; 
    getLocation(); 
} 

public static String UserLoginFile; 
public static String UserPassFile; 

// Функция для определения местоположения 
public Location getLocation() { 
    try { 
     locationManager = (LocationManager) mContext 
       .getSystemService(LOCATION_SERVICE); 

     // getting GPS status 
     isGPSEnabled = locationManager 
       .isProviderEnabled(LocationManager.GPS_PROVIDER); 

     // getting network status 
     isNetworkEnabled = locationManager 
       .isProviderEnabled(LocationManager.NETWORK_PROVIDER); 

     if (!isGPSEnabled && !isNetworkEnabled) { 
      // no network provider is enabled 
     } else { 
      this.canGetLocation = true; 
      if (isNetworkEnabled) { 
       locationManager.requestLocationUpdates(
         LocationManager.NETWORK_PROVIDER, 
         MIN_TIME_BW_UPDATES, 
         MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
       Log.d("Network", "Network"); 
       if (locationManager != null) { 
        location = locationManager 
          .getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 
        if (location != null) { 
         latitude = location.getLatitude(); 
         longitude = location.getLongitude(); 
        } 
       } 
      } 
      // if GPS Enabled get lat/long using GPS Services 
      if (isGPSEnabled) { 
       if (location == null) { 
        locationManager.requestLocationUpdates(
          LocationManager.GPS_PROVIDER, 
          MIN_TIME_BW_UPDATES, 
          MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
        Log.d("GPS Enabled", "GPS Enabled"); 
        if (locationManager != null) { 
         location = locationManager 
           .getLastKnownLocation(LocationManager.GPS_PROVIDER); 
         if (location != null) { 
          latitude = location.getLatitude(); 
          longitude = location.getLongitude(); 
         } 
        } 
       } 
      } 
     } 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 

    return location; 
} 
/** 
* Stop using GPS listener 
* Calling this function will stop using GPS in your app 
* */ 
public void stopUsingGPS(){ 
    if(locationManager != null){ 
     locationManager.removeUpdates(GPSTracker.this); 
    }  
} 

/** 
* Function to get latitude 
* */ 
public double getLatitude(){ 
    if(location != null){ 
     latitude = location.getLatitude(); 
    } 

    // return latitude 
    return latitude; 
} 

/** 
* Function to get longitude 
* */ 
public double getLongitude(){ 
    if(location != null){ 
     longitude = location.getLongitude(); 
    } 

    // return longitude 
    return longitude; 
} 

/** 
* Function to check GPS/wifi enabled 
* @return boolean 
* */ 
public boolean canGetLocation() { 
    return this.canGetLocation; 
} 

/** 
* Function to show settings alert dialog 
* On pressing Settings button will lauch Settings Options 
* */ 
public void showSettingsAlert(){ 
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext); 

    // Setting Dialog Title 
    alertDialog.setTitle("GPS is settings"); 

    // Setting Dialog Message 
    alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?"); 

    // On pressing Settings button 
    alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog,int which) { 
      Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
      mContext.startActivity(intent); 
     } 
    }); 

    // on pressing cancel button 
    alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
     dialog.cancel(); 
     } 
    }); 

    // Showing Alert Message 
    alertDialog.show(); 
} 



//события которые происходят если позиция поменялась 
@Override 
public void onLocationChanged(Location location) { 
    this.location = location; 

    //Здесь берутся из настроек Параметры отвечающие за позиционирования разрешено или нет 
    SharedPreferences sharedPrefs = mContext.getSharedPreferences("location_share_enordis", Context.MODE_PRIVATE); 
    Boolean GPSnotif = sharedPrefs.getBoolean("location_share_enordis", true); 

    if (GPSnotif.equals(true)) { 
     //Отправка местоположения если позиция изменилась 10_06_2013____This block work 
     GPSTracker gps = new GPSTracker(this); // работает 
     new PostData(gps, RD, mContext).execute(); 
     //Test to LogCat 
     Log.d("LOCATION CHANGED_IN_GPSTracker_Latitude", location.getLatitude() + ""); 
     Log.d("LOCATION CHANGED_IN_GPSTracker_Longitude", location.getLongitude() + ""); 
    } 
    else { 

    } 


} 


@Override 
public void onProviderDisabled(String provider) { 
} 

@Override 
public void onProviderEnabled(String provider) { 
} 

@Override 
public void onStatusChanged(String provider, int status, Bundle extras) { 
} 

@Override 
public IBinder onBind(Intent arg0) { 
    return null; 
}

}

logcat的

06-12 10:01:31.656: D/GPS Enabled(2077): GPS Enabled 
06-12 10:01:31.715: D/Start AsyncTask PostData(2077): Started 
06-12 10:01:31.715: D/LOCATION_IN_PostData_Latitude(2077): 49.422005000000006 
06-12 10:01:31.715: D/LOCATION_IN_PostData_Longitude(2077): -129.08409333333333 
06-12 10:01:31.936: I/Choreographer(2077): Skipped 42 frames! The application may be doing too much work on its main thread. 
06-12 10:01:31.945: D/gralloc_goldfish(2077): Emulator without GPU emulation detected. 
06-12 10:01:32.495: I/Choreographer(2077): Skipped 33 frames! The application may be doing too much work on its main thread. 
06-12 10:01:33.255: E/Web Console(2077): Viewport argument value "device-width;" for key "width" not recognized. Content ignored. at http://myheart.pp.ua/:8 
06-12 10:01:33.255: V/Web Console(2077): Viewport argument value "1.0;" for key "initial-scale" was truncated to its numeric prefix. at http://myheart.pp.ua/:8 
06-12 10:01:33.255: V/Web Console(2077): Viewport argument value "1.0;" for key "maximum-scale" was truncated to its numeric prefix. at http://myheart.pp.ua/:8 
06-12 10:01:33.275: V/Web Console(2077): Viewport argument value "0;" for key "user-scalable" was truncated to its numeric prefix. at http://myheart.pp.ua/:8 
06-12 10:01:34.265: D/dalvikvm(2077): GC_CONCURRENT freed 231K, 4% free 8194K/8519K, paused 30ms+110ms, total 191ms 
06-12 10:01:34.985: W/SingleClientConnManager(2077): Invalid use of SingleClientConnManager: connection still allocated. 
06-12 10:01:34.985: W/SingleClientConnManager(2077): Make sure to release the connection before allocating another one. 
06-12 10:01:50.095: W/System.err(2077): java.lang.NullPointerException 
06-12 10:01:50.095: W/System.err(2077):  at android.content.ContextWrapper.getSystemService(ContextWrapper.java:416) 
06-12 10:01:50.095: W/System.err(2077):  at com.teleport.saas.GPSTracker.getLocation(GPSTracker.java:70) 
06-12 10:01:50.095: W/System.err(2077):  at com.teleport.saas.GPSTracker.<init>(GPSTracker.java:60) 
06-12 10:01:50.095: W/System.err(2077):  at com.teleport.saas.GPSTracker.onLocationChanged(GPSTracker.java:214) 
06-12 10:01:50.095: W/System.err(2077):  at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:237) 
06-12 10:01:50.095: W/System.err(2077):  at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:170) 
06-12 10:01:50.106: W/System.err(2077):  at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:186) 
06-12 10:01:50.106: W/System.err(2077):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-12 10:01:50.106: W/System.err(2077):  at android.os.Looper.loop(Looper.java:137) 
06-12 10:01:50.106: W/System.err(2077):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
06-12 10:01:50.106: W/System.err(2077):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-12 10:01:50.106: W/System.err(2077):  at java.lang.reflect.Method.invoke(Method.java:511) 
06-12 10:01:50.106: W/System.err(2077):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
06-12 10:01:50.106: W/System.err(2077):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
06-12 10:01:50.106: W/System.err(2077):  at dalvik.system.NativeStart.main(Native Method) 
06-12 10:01:50.125: D/LOCATION CHANGED_IN_GPSTracker_Latitude(2077): 11.422005000000002 
06-12 10:01:50.125: D/LOCATION CHANGED_IN_GPSTracker_Longitude(2077): -111.084095 
06-12 10:01:50.135: D/Start AsyncTask PostData(2077): Started 
06-12 10:01:50.135: D/LOCATION_IN_PostData_Latitude(2077): 0.0 
06-12 10:01:50.135: D/LOCATION_IN_PostData_Longitude(2077): 0.0 
06-12 10:01:50.315: W/SingleClientConnManager(2077): Invalid use of SingleClientConnManager: connection still allocated. 
06-12 10:01:50.315: W/SingleClientConnManager(2077): Make sure to release the connection before allocating another one.

當使用發送座標到服務器的手動方法。座標是通過函數gps.getLatitude（）; gps.getLongitude（）;並按照LogCat所示正確發送。但只要需要更新自動方式的座標，他們在POSTDATA的AsyncTask

06-12 10:01:50.135: D/LOCATION_IN_PostData_Latitude(2077): 0.0 
06-12 10:01:50.135: D/LOCATION_IN_PostData_Longitude(2077): 0.0

分爲（）onLocationChanged功能

LOCATION CHANGED_IN_GPSTracker_Latitude(2077): 11.422005000000002 
LOCATION CHANGED_IN_GPSTracker_Longitude(2077): -111.084095

，但他們都爲空（0.0），我可以不明白爲什麼AsyncTask中的函數收到null（0.0）經度和緯度的原因。請幫我解決我的問題。我應該通過自動數據發送方法對我的AsyncTask代碼進行哪些更改，以獲取正確的緯度和經度值。在此先感謝。

來源

2013-06-12 Olga

只需簡單地使用：

LocationManager loc = (LocationManager) getSystemService(Context.LOCATION_SERVICE)

得到服務。

然後LocationListener的後面是實現it.like =類>

LocationListener listener = new MyLocationListener();

然後通過讀取你的requestLocationUpdates方法的更新。像=>

loc.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, your minimum time, your minimum distance, listener)

不要忘了創建內部類MyLocationListener必須是實現LocationListener的interface.like =>

public class MyLocationListener implements LocationListener{ 

    @Override 
    public void onLocationChanged(Location location) { 
    //**fetch all your latitudes and longitudes through location object**  } 

    @Override 
    public void onProviderDisabled(String provider) { 
    //**do our show something when gps is disabled** 

    } 

    @Override 
    public void onProviderEnabled(String provider) { 

    } 
    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) { 

    //**Do/Show something when status changed i.e provider is unable to fetch data** 
    }

.......... 添加此代碼首先啓用gps和wifi，如果它們被禁用。

要啓用GPS：

 String provider = Settings.Secure.getString(getContentResolver(), 
      Settings.Secure.LOCATION_PROVIDERS_ALLOWED); 

    if (!provider.contains("gps")) { 
     final Intent poke = new Intent(); 
     poke.setClassName("com.android.settings", 
       "com.android.settings.widget.SettingsAppWidgetProvider"); 

     poke.addCategory(Intent.CATEGORY_ALTERNATIVE); 
     poke.setData(Uri.parse("3")); 
     sendBroadcast(poke); 
    }

而關於WIFI：

 WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE); 

     if (!wm.isWifiEnabled()) { 
     wm.setWifiEnabled(true); 
     } else { 
     // for disable when requir 
     wm.setWifiEnabled(false); 
     }

如果你會做一個簡單的事情，用硬的方式，那麼它會一定會讓你混淆。

全部最好

來源

2013-08-15 09:47:18 Ranjit

服務函數onLocationChanged（）在AsyncTask中返回0.0座標

回答

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