Google maps custom marker icon with clustering on Android

Question

I have implemented the code of Google Maps Clustering

This is the code in my activity

private void setUpClusterer() {
    mClusterManager = new ClusterManager<StoreItem>(this, mMap);
    mMap.setOnCameraChangeListener(mClusterManager);
    mMap.setOnMarkerClickListener(mClusterManager);
}

public void addItems(List<Store> stores) {
    for (Store store : stores) {
        mClusterManager.addItem(new StoreItem(store.getImage(), store.getLocation().getLatitude(), store.getLocation().getLongitude()));
    }
}

private void removeAllItems() {
    mClusterManager.clearItems();
}

This is the StoreItem Class

public class StoreItem implements ClusterItem {

    private String url;
    private final LatLng mPosition;

    public StoreItem(String url, double lat, double lng) {
        this.url = url;
        mPosition = new LatLng(lat, lng);
    }

    @Override
    public LatLng getPosition() {
        return mPosition;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }
}

Now, I would like to to change the marker icons via the url parameter in the StoreItem class.

How can I do this?

score 5 · Accepted Answer · edited Apr 05 '21 at 14:06

5

Consider overriding onBeforeClusterRendered. Something like will work:

BitmapDescriptor descriptor = BitmapDescriptorFactory.fromBitmap(here_goes_your_bitmap);
markerOptions.icon(descriptor);

Keep in mind that code is just for sample. You have to add text to bitmap manually and add some caching mechanism for real use. You can see source code of DefaultClusterRenderer for sample.

edited Apr 05 '21 at 14:06

chedabob

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answered Jul 18 '16 at 21:44

Alexander Mironov

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FYI: Both links are dead now – rekire Dec 22 '20 at 11:38
Incase if anyone is looking for the links, I have submitted and edit for the answer and it is available at: https://github.com/googlemaps/android-maps-utils/blob/master/library/src/main/java/com/google/maps/android/clustering/view/DefaultClusterRenderer.java – ravi Apr 05 '21 at 07:54

score 3 · Answer 2 · answered Apr 27 '18 at 07:18

you need to @override method onBeforeClusterItemRendered() Of DefaultClusterRenderer class get iconurl in onBeforeClusterItemRendered set to markerOptions please find below code:

private class CustomMapClusterRenderer<T extends ClusterItem> extends DefaultClusterRenderer<T> {
        CustomMapClusterRenderer(Context context, GoogleMap map, ClusterManager<T> clusterManager) {
            super(context, map, clusterManager);
        }

        @Override
        protected boolean shouldRenderAsCluster(Cluster<T> cluster) {
            //start clustering if 2 or more items overlap
            return cluster.getSize() >= Constants.MINIMUM_CLUSTER_SIZE;
        }

        @Override
        protected void onBeforeClusterItemRendered(T item,
                                                   MarkerOptions markerOptions) {
            ClusterMarkerItem markerItem = (ClusterMarkerItem) item;
            markerOptions.icon(BitmapDescriptorFactory.fromPath(markerItem.getURL()));
        }
    }

Where should i use this `CustomMapClusterRenderer ` class? – softmarshmallow Jan 28 '19 at 10:03 — softmarshmallow, Jan 28 '19 at 10:03

score 0 · Answer 3 · answered Jun 24 '23 at 08:53

Neelesh's answer worked for me. Remember to link that renderer to your cluster

private ClusterManager<AntenaModel> clusterManager;

clusterManager = new ClusterManager<>(ctx, mMap);
clusterManager.setRenderer(new CustomMapClusterRenderer<>(ctx, mMap, clusterManager));

Google maps custom marker icon with clustering on Android

3 Answers3