I want to create a application in android which can put a lock(password) on 
Home Screen, Application, Gallery and Files.

For home screen, I can make a home screen widget that will launch on device 
boot.

For Apps I can use following solution, Android Lock 
Apps<http://stackoverflow.com/questions/7248080/android-lock-apps>

For Files I can do following things,
1 - Encrypt the files.
2 - Make use of FileObserver.
3 - Move files to application directory.(Which is not visible to other apps 
if device is not rooted)

Locking image files will left Gallery with no images to display. (Thus 
locked logically)

My question is:
What should I be doing exactly?

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