Detecting if no Network to obtain Geo Coordinates

Question

My app is heavily run off GeoCoordinates, and I have it so when users Post a Book it records the users geo coordinate like so:

PostBookButton.setOnClickListener(new View.OnClickListener() {


            @Override
            public void onClick(View v) {

                locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
                locationListener = new ObtainLocation();
                locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);

            }
        });

public class ObtainLocation implements LocationListener{
        @Override
      public void onLocationChanged(Location loc) {


            if (loc != null)
            {
                Latitude = loc.getLatitude();
                Longitude = loc.getLongitude();


                ParseGeoPoint itemLoc = new ParseGeoPoint(Latitude,Longitude);

                    book.setGeoLocation(itemLoc);

                    book.saveInBackground(new SaveCallback()
                    {

                        @Override
                        public void done(ParseException e) {
                            if (e == null) 
                            {
                                finish();
                            } 
                            else 
                            {

                            }
                        }
                    });
                }
            }
            else
            {

            }

            locationManager.removeUpdates(locationListener);
      }

But problem is app will crash if the activity is ran with no network connection, seeing how it won't be able to obtain the geopoint coordinates.

How would I just make it so if the app fails on obtaining coordinates, instead of crashing maybe alert the user they cannot view books in their area due to no way to obtain their current location.

Have you tried leveraging Google Play Services Location APIs? They handle a lot of the grunt work for you to obtain locations. http://developer.android.com/google/play-services/location.html — WindsurferOak, Mar 27 '14 at 17:31

WindsurferOak · Accepted Answer · 2014-03-27T17:29:09.237

Update: The solution below is a general network connectivity one and won't necessarily tell you if you can get location updates through wifi as pointed out in comments.

You can register to receive network connectivity updates using a BroadcastReceiver. Register to listen for the android.net.conn.CONNECTIVITY_CHANGE action. Take a look at this for more info. Below, is a sample receiver.

public class ConnectivityReceiver extends WakefulBroadcastReceiver {
private static final String TAG = ConnectivityReceiver.class.getSimpleName();

@Override
public void onReceive(Context context, Intent intent) {
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (cm.getActiveNetworkInfo() != null && cm.getActiveNetworkInfo().isConnected()) {
        Log.d(TAG, "network state change; new state: connected");
    } else {
        Log.d(TAG, "network state change; new state: " + (cm.getActiveNetworkInfo() != null ? cm.getActiveNetworkInfo().getState() : " unknown"));
    }
}

}

And what if the user has an access to network, but disabled location access through wifi and network in system preferences?.. — Alex Salauyou, Mar 27 '14 at 17:05
@Salauyou, I see your point. This solution is a general network connectivity solution. — WindsurferOak, Mar 27 '14 at 17:25

Alex Salauyou · Answer 2 · 2014-03-27T17:26:21.483

In addition to checking network accessibility, check if network location provider is enabled by user's system preferences:

ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
if ( lm == null || cm == null
     || !lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER) 
     || !cm.getActiveNetworkInfo().isConnected()) {
  // show alert: geolocation through network is inaccessible
}

Detecting if no Network to obtain Geo Coordinates

2 Answers2