Google Map API V2 - How do I keep a marker in the center of the screen while user is scrolling the map?

Question

Google Map API V2 - How do I keep a marker in the center of the screen while user is scrolling the map ?

My purpose is to let user choose a location. I use the following code to add a marker (it's from the com.example.mapdemo in Android SDK)

mMap.addMarker(new MarkerOptions()
    .position(new LatLng(0, 0))
    .title("Marker"));

How do I keep the marker in the center of the screen and then retrieve it's location?

Answer 1

I do not think that you can actually keep a marker in the middle of the screen and float it easily. My suggestion is to trick your user. Add your marker image onto the map like a button. you can place it in the middle of the screen using the xml layout. Then when your user selects a location just retrieve the gps coordinates from the middle of the screen.

On a side note you could also just make your marker draggable Then the user could drag it around the map.

mMap.addMarker(new MarkerOptions().position(coordinate)
                    .title("Your Title")
                    .snippet("Please move the marker if needed.")
                    .draggable(true)); 

Answer 2

How about?

mMap.setOnCameraChangeListener(new OnCameraChangeListener() {
        public void onCameraChange(CameraPosition arg0) {   
                mMap.clear();               
                mMap.addMarker(new MarkerOptions().position(arg0.target));
        }
});