Question

I’m adding dynamically a non-fixed amount of markers in a map, which each of them are related to one instance of my POCO class.

I need to link them so when the user clicks on one of the markers, I show the rest of the data inside the custom InfoWindow.

What do you suggest?

PS: I add new markers everytime the user pans or zooms the map and I worried about overloading the app. Are the non visible markers disposed?

Answer 1

I suggest using a HashMap or something similar. As you iterate over your list of objects and create markers for them, also add the Marker to a list, using the ID of the object as the key, and the marker as the value:

private HashMap<Integer, Marker> markerMap = new HashMap<Integer, Marker>();

…

for(MarkerObject obj : this.markerObjects)
{
     //If the marker isn't already being displayed
     if(!markerMap.containsKey(obj.getId()))
     {
         //Add the Marker to the Map and keep track of it 
         this.markerMap.put(obj.getId(), this.mMap.addMarker(getMarkerForObject(obj)));
     }
}

Then you can use a OnInfoWindowClickListener to find the object id of the tapped marker in your Map and do something with the corresponding data, like open a new activity with details.