Code style fixes, removed unused code and Layout code simplified

Bug: On SoftKeyBoard focus, Portrait Mode, Entire Message box is shrinking.
Further changes needed: Add a softkeyboard visible listener, to hide decrypt button if visible.

Changes: 
Edited the code, removed unused code in layouts and added strings to string.xml.
Removed second definition of Interface. 
Changed message fragment layout. Message box occupies entire layout. 

Tests:
Intents (API) - Checked 'DECRYPT' Intent. Installed the API Demo. Working fine. I have not encountered any problems.
App - Apart from the bug above, No problems encountered. 

P.S: If you are facing any problems with intents, please paste the logcat details or screenshots.