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How do I add a marker on the center of the map using osmdroid

I am currently using 2 activities, the first will load the map and there will be a menu option called "add place" when this is clicked the user fills it in and then it is sent back to the main activity where it then adds a marker with this String. The problem is that I can only add a marker to a specific location where I define the latitude and longitude using GeoPoint. I want to be able to add the marker on the last location which the map was positioned. Could anyone give me any ideas as to how I could go about this?

You can get geopoint for current center of the map:

IGeoPoint point = mapView.getMapCenter()

And then use it for marker construction.

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