How to show InfoWindow using Android Maps Utility Library for Android

Question

I'm using Google Maps Android API Utility Library in order to show several markers in a map in a clustered way. I've followed the instructions to make it work, as well as taking a look at the examples in the library, but I can't figure out how to show an InfoWindow when a marker is clicked.

I guess getMap().setOnMarkerClickListener(mClusterManager); is the one managing the onClick events, and if commented out, I can override it using getMap().setInfoWindowAdapter(new InfoWindowAdapter() {)); but I have no access to my custom marker object. Nevertheless, if I use getMap().setOnMarkerClickListener(mClusterManager);, I can't find a way to show the InfoWindow when a marker has been clicked.

Does anybody have any idea about how to achieve this?

Thanks a lot in advance!

Answer 1

You need to extend the DefaultClusterRenderer class and override the onBeforeClusterItemRendered, attaching the title to the MarkerOptions object passed as argument.

After that, you can pass your implementation to the ClusterManager.

Example:

class MyItem implements ClusterItem {

    private LatLng mPosition;
    private String mTitle;

    public MyItem(LatLng position){
        mPosition = position;
    }

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

    public String getTitle() {
        return mTitle;
    }

    public void setTitle(String title) {
        mTitle = title;
    }
}

class MyClusterRenderer extends DefaultClusterRenderer<MyItem> {

    public MyClusterRenderer(Context context, GoogleMap map,
            ClusterManager<MyItem> clusterManager) {
        super(context, map, clusterManager);
    }

    @Override
    protected void onBeforeClusterItemRendered(MyItem item, MarkerOptions markerOptions) {
        super.onBeforeClusterItemRendered(item, markerOptions);

        markerOptions.title(item.getTitle());
    }

    @Override
    protected void onClusterItemRendered(MyItem clusterItem, Marker marker) {
        super.onClusterItemRendered(clusterItem, marker);

        //here you have access to the marker itself
    }
}

And then you can use it in this way:

ClusterManager<MyItem> clusterManager = new ClusterManager<MyItem>(this, getMap());
clusterManager.setRenderer(new MyClusterRenderer(this, getMap() ,clusterManager));