Recently I have found in Google Play a free app named DicePool (although there is a full version for 0.70€). With this app you can throw dice quickly for your wargames or RPG, even allow you to configure your own special dice for games like Xwing or Bloodbowl, etc.
It is fitting me very well...
To help you al building your armylist, there is a cheap army list builder 8th ed with Tomb King latest rulebook support for Android devices (phones, tablets)
The app is now updated to support android version 1.6 (G1)
Get it at the android market (search for: armylist builder) or navigate...
I have spotted an army list builder for android. Search for "army list builder" or look in the application/tools section.
My army is there :) (Dwarven) And I have read that more armies will be supported in the near future.