I need to replace MapQuest's map with my tile server URL which looks like http://tile.openstreetmap.org/{z}/{x}/{y}.png by keeping the controls as it is Eg: Marker & Polygon. I followed this link and couldn't find a source to my problem.
The below image is my present mapview which is generated by MapQuest
The MapQuest mapping tools are built to display MapQuest maps. There is no method to display other maps. You may want to try osmdroid.