I want to use the Google Maps API but I can not import the following, because it marks everything I want to import as unknown:
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
Look for information and that is why I should have installed Google Play Services but I already have it downloaded, what can I do?