title: how to get Location object every 10 minutes in android
body: <p>please someone give me a code can recover the GPS position or every n minutes, I tested several code but no result</p>
  
  <p>Please someone give me a tutorial or a small program for that, I'm really stuck</p>
  
  <pre><code>public final class TrackListener implements LocationListener {
  
      private final Context mContext;
      public boolean isGPSEnabled = false;
      boolean isNetworkEnabled = false;
      public 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 * 1; // 1 minute
      // Declaring a Location Manager
      protected LocationManager locationManager;
  
      public TrackListener(Context context) {
          this.mContext = context;
          getLocation();
      }
      public Location getLocation() {
          try {
              locationManager = (LocationManager) mContext
                      .getSystemService(Contexts.LOCATION_SERVICE);
              isGPSEnabled = locationManager
                      .isProviderEnabled(LocationManager.GPS_PROVIDER);
  
              Log.v("isGPSEnabled", "=" + isGPSEnabled);
              isNetworkEnabled = locationManager
                      .isProviderEnabled(LocationManager.NETWORK_PROVIDER);
  
              Log.v("isNetworkEnabled", "=" + isNetworkEnabled);
  
              if (isGPSEnabled == false &amp;&amp; isNetworkEnabled == false) {
              } 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 (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;
      }
      public void stopUsingGPS() {
          if (locationManager != null) {
              locationManager.removeUpdates(TrackListener.this);
          }
      }
      public double getLatitude() {
          if (location != null) {
              latitude = location.getLatitude();
          }
          return latitude;
      }
      public double getLongitude() {
          if (location != null) {
              longitude = location.getLongitude();
          }
          return longitude;
      }
      public boolean canGetLocation() {
          return this.canGetLocation;
      }
      public void showSettingsAlert() {
          AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
          alertDialog.setTitle("GPS is settings");
          alertDialog
                  .setMessage("GPS is not enabled. Do you want to go to settings menu?");
          alertDialog.setPositiveButton("Settings",
                  new DialogInterface.OnClickListener() {
                      public void onClick(DialogInterface dialog, int which) {
                          Intent intent = new Intent(
                                  "ACTION_LOCATION_SOURCE_SETTINGS");
                          mContext.startActivity(intent);
                      }
                  });
          alertDialog.setNegativeButton("Cancel",
                  new DialogInterface.OnClickListener() {
                      public void onClick(DialogInterface dialog, int which) {
                          dialog.cancel();
                      }
                  });
          alertDialog.show();
      }
  
      public void onLocationChanged(Location location) {
          if (location != null) {
              latitude = location.getLatitude();
              longitude = location.getLongitude();
          }
      }
      @Override
      public void onProviderDisabled(String provider) {
          Toast.makeText(Contexts.getAppContext(), "GPS Disable ",
                  Toast.LENGTH_LONG).show();
      }
      @Override
      public void onProviderEnabled(String provider) {
          Toast.makeText(Contexts.getAppContext(), "GPS enabled",
                  Toast.LENGTH_LONG).show();
      }
  
      @Override
      public void onStatusChanged(String provider, int status, Bundle extras) {
      }
  </code></pre>
  
  <p>but when calling "getLocation()" in the class activity I find a fatal problem</p>
  
  <pre><code> 04-28 08:41:55.126: W/dalvikvm(16004): threadid=1: thread exiting with uncaught exception (group=0x40015560)
      04-28 08:41:55.186: E/AndroidRuntime(16004): FATAL EXCEPTION: main
      04-28 08:41:55.186: E/AndroidRuntime(16004): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.testss/com.example.testss.MainActivity}: java.lang.NullPointerException
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at android.os.Handler.dispatchMessage(Handler.java:99)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at android.os.Looper.loop(Looper.java:123)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at android.app.ActivityThread.main(ActivityThread.java:3683)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at java.lang.reflect.Method.invokeNative(Native Method)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at java.lang.reflect.Method.invoke(Method.java:507)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at dalvik.system.NativeStart.main(Native Method)
      04-28 08:41:55.186: E/AndroidRuntime(16004): Caused by: java.lang.NullPointerException
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at com.example.testss.MainActivity.onCreate(MainActivity.java:27)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
      04-28 08:41:55.186: E/AndroidRuntime(16004):    ... 11 more
      04-28 08:46:55.255: I/Process(16004): Sending signal. PID: 16004 SIG: 9
  </code></pre>