IP addresses && scrollable main activity

I've been hacking RemoteKeyboard code. I've implemented two things:

1. Showing all IP addresses at the main activity.
2. Showing one IPv4 address at the notification area.
3. Making the main activity layout scrollable.

Since when I started hacking the code, I see you have already implemented the second item from this list. Well, you may want to look at my changes anyway. Bear with me, as I have almost zero Android and Java experience.