JS - Google maps api get zoomed area markers

geolocalisation.js

private boolean isVisibile(Marker marker)
{
    if(googleMap != null)
    {
        //This is the current user-viewable region of the map
        LatLngBounds latLongBounds = googleMap.getProjection().getVisibleRegion().latLngBounds;

            if(latLongBounds.contains(marker.getPosition()))
                   //If the item is within the the bounds of the screen
                  return true;
            else
                  //If the marker is off screen
                  return false;
    }
    return false;
}