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Google maps custom marker icon with clustering on Android

Posted by: admin June 16, 2020 Leave a comment

Questions:

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?

How to&Answers:

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.

Answer:

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()));
        }
    }