Added some margin to playfield
Added square size determination based on playfield's width
Set holo theme with title(action)-bar
Layout extended with some text view and buttons
Added some needed strings
Height of playfield set equal to its width
Added button onclick listener code
Changed members to private with getters/setters
Placed the game logic and the diplaying code into the correct classes
Changed some methods/members to private/protected as nothing more is needed
Added color buttons and their onclick handlers
Some code cleanup