Fixes: #166 Check location settings emits just a single value

Author: mcharmas

android-reactive-location/src/main/java/pl/charmas/android/reactivelocation2/ReactiveLocationProvider.java

@@ -69,7 +69,7 @@ public ReactiveLocationProvider(Context ctx) {
     /**
      * Creates location provider with custom handler in which all GooglePlayServices callbacks are called.
      *
-     * @param ctx preferably application context
+     * @param ctx     preferably application context
      * @param handler on which all GooglePlayServices callbacks are called
      * @see com.google.android.gms.common.api.GoogleApiClient.Builder#setHandler(android.os.Handler)
      */
@@ -312,7 +312,7 @@ public Observable<ActivityRecognitionResult> getDetectedActivity(int detectInter
      * Observable that can be used to check settings state for given location request.
      *
      * @param locationRequest location request
-     * @return observable that emits check result of location settings
+     * @return observable that emits single check result of location settings
      * @see com.google.android.gms.location.SettingsApi
      */
     public Observable<LocationSettingsResult> checkLocationSettings(final LocationSettingsRequest locationRequest) {
@@ -322,7 +322,8 @@ public Observable<LocationSettingsResult> checkLocationSettings(final LocationSe
                     public Observable<LocationSettingsResult> apply(GoogleApiClient googleApiClient) {
                         return fromPendingResult(LocationServices.SettingsApi.checkLocationSettings(googleApiClient, locationRequest));
                     }
-                });
+                })
+                .take(1);
     }
 
     /**