Launch Google Maps to show road directions

Question

How do I launch Google Maps from my own application to show road directions from current position (GPS) to a specified address?

Answer 1

This intent should launch the appropriate Maps Activity with the directions input screen populated with current location and a destination point:

Intent intent = new Intent(Intent.ACTION_VIEW, 
    Uri.parse("http://maps.google.com/maps?f=d&daddr=51.448,-0.972"));
intent.setComponent(new ComponentName("com.google.android.apps.maps", 
    "com.google.android.maps.MapsActivity"));
startActivity(intent);

Answer 2

Uri uri = Uri.parse("geo:40.763500,-73.979305");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent); 

Try it.