CustomInfoView.java

public class CustomInfoView implements GoogleMap.InfoWindowAdapter{

    private LayoutInflater inflater;
    private Context context;
    private WeakHashMap<Marker, Hotel> hashMap;

    public CustomInfoView(Context context, WeakHashMap<Marker, Hotel> hashMap) {
        this.context = context;
        this.hashMap = hashMap;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public View getInfoWindow(Marker marker) {
        return null;
    }

    @Override
    public View getInfoContents(Marker marker) {
        View view = inflater.inflate(R.layout.infoview_map, null);
        ImageView imageView = (ImageView) view.findViewById(R.id.imageHotelThumb);
        Picasso.with(context).load(hashMap.get(marker).imageURL).into(imageView);
        return view;
    }
}