You can try the sample app called Nearby that is included with the SDK. I've also included a code snippet that you can add to an Options Menu button (or on-screen button, etc.):
LocationService ls = map.getLocationService();
if (ls.isStarted() == false) {
ls.setAutoPan(false);
ls.start();
Point point = ls.getPoint();
map.zoomToScale(point, 60000);
Toast.makeText(YourActivityName.this, "Select My Location again to disable GPS",Toast.LENGTH_SHORT).show();
}
else {
ls.stop();
};