Drop pin in MapView

Question

I readed this: http://stackoverflow.com/questions/2683287/drop-pin-on-default-google-maps-in-android and do all the same. But there is no pin droped on the map, after i call: startActivity(new Intent(Intent.ACTION_VIEW, uri));

The map centered on that uri-location, but no any pin dropped on the map.

So, there is a question: How to drop pin on the map?