Is there a possiblity to open a infoWindow with a click on a MarkerClusterer with OsmDroid + OsmBonusPack?
I want to display information about the different Markers which are inside the MarkerClusterer.
Yes, you can.
Sub-class the RadiusMarkerClusterer (I assume you are using this one), and override the #renderer method.
Copy the RadiusMarkerClusterer.renderer. Then, just after the Marker is created:
Marker m = buildClusterMarker(cluster, mapView);
give to this Marker your InfoWindow:
m.setInfoWindow(myOwnInfoWindow)
You may have to sub-class the MarkerInfoWindow, depending on what you want to display exactly about the clustered markers.