adaptador de ventana de información personalizada con datos personalizados en map v2

Prueba esto

windowlayout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_lat"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/tv_lng"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java

public class MainActivity extends FragmentActivity {


GoogleMap googleMap;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Getting reference to the SupportMapFragment of activity_main.xml
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);

    // Getting GoogleMap object from the fragment
    googleMap = mapFragment.getMap();

    // Setting a custom info window adapter for the google map
    googleMap.setInfoWindowAdapter(new InfoWindowAdapter() {

        // Use default InfoWindow frame
        @Override
        public View getInfoWindow(Marker arg0) {
            return null;
        }

        // Defines the contents of the InfoWindow
        @Override
        public View getInfoContents(Marker arg0) {

            // Getting view from the layout file info_window_layout
            View v = getLayoutInflater().inflate(R.layout.windowlayout, null);

            // Getting the position from the marker
            LatLng latLng = arg0.getPosition();

            // Getting reference to the TextView to set latitude
            TextView tvLat = (TextView) v.findViewById(R.id.tv_lat);

            // Getting reference to the TextView to set longitude
            TextView tvLng = (TextView) v.findViewById(R.id.tv_lng);

            // Setting the latitude
            tvLat.setText("Latitude:" + latLng.latitude);

            // Setting the longitude
            tvLng.setText("Longitude:"+ latLng.longitude);

            // Returning the view containing InfoWindow contents
            return v;

        }
    });

    // Adding and showing marker while touching the GoogleMap
    googleMap.setOnMapClickListener(new OnMapClickListener() {

        @Override
        public void onMapClick(LatLng arg0) {
            // Clears any existing markers from the GoogleMap
            googleMap.clear();

            // Creating an instance of MarkerOptions to set position
            MarkerOptions markerOptions = new MarkerOptions();

            // Setting position on the MarkerOptions
            markerOptions.position(arg0);

            // Animating to the currently touched position
            googleMap.animateCamera(CameraUpdateFactory.newLatLng(arg0));

            // Adding marker on the GoogleMap
            Marker marker = googleMap.addMarker(markerOptions);

            // Showing InfoWindow on the GoogleMap
            marker.showInfoWindow();

        }
    });

}
}

De esta manera puede crear un diseño personalizado y lograr la forma en que desea hacerlo.

Hazme saber si te ayuda.