MainActivity.java

String locationQuery = null;
if (country != null)
    locationQuery = country;

if (city != null) {
    if (locationQuery == null)
        locationQuery = city;
    else
        locationQuery += ", " + city;
}

if (locationQuery != null) {
    try {
        Address address = new Geocoder(MainActivity.this).getFromLocationName(locationQuery, 1).get(0);
        Log.d("Basic Data", String.format("Lat: %f, Lng: %f", address.getLatitude(), address.getLongitude()));

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