How to modify cluster item total sum value?

Question

Currently I'm using google maps utils to implement markers and their clustering in the map.

The question is that I want only some of those markers to count for the total sum of the cluster density.

I was looking to make the decision process based on the markers tag, but I can't seem to find no way to alter the total marker count in each cluster.

Is there any way to do this?

Thank you

Answer 1

In your ClusterRenderer override onBeforeClusterRendered as follows:

@Override
protected void onBeforeClusterRendered(Cluster<MyClusterItem> cluster,
                                       MarkerOptions markerOptions) {

    // Calculate totalSum by checking the color of item
    int totalSum = 0;
    for (MyClusterItem item : cluster) {
        // Assume each MyClusterItem holds an attribute -- String color --.
        // Also, assume you can get this attribute by using the following method.
        if (item.getColorAsString().equals("red")) {
            totalSum++;
        }
    }

    // Write a method to customize your cluster drawable according to totalSum.
    Drawable customDrawable = customizeClusterDrawable(totalSum);
    mClusterImageView.setImageDrawable(customDrawable);
    Bitmap icon = mClusterIconGenerator.makeIcon(String.valueOf(cluster.getSize()));
    markerOptions.icon(BitmapDescriptorFactory.fromBitmap(icon));
}