MapView in Android

Is it possible to achieve something like this?

I am preparing one application using mapView, I want to display the current location and even add labels of all other users. This thing that I implemented now I want to highlight some labels by drawing a circle on the mapView. those. the first user will scale the map as he wishes, then the user will select the number of users by drawing a circle on the mapView, and at that time the map scaling will freeze, that is, the map scaling functionality will be displayed on the scaling circle.

Is there any sample code for this implementation?

Thank!