Allow password protecting ideas

[ValeryIvanov]

http://stackoverflow.com/questions/5980658/how-to-sha1-hash-a-string-in-android

[ValeryIvanov]

http://stackoverflow.com/questions/5220761/fast-and-simple-string-encrypt-decrypt-in-java

[ValeryIvanov]

http://stackoverflow.com/questions/4685563/how-to-pass-a-function-as-a-parameter-in-java

[ValeryIvanov]

http://stackoverflow.com/questions/18147354/sqlite-connection-leaked-although-everything-closed

[ValeryIvanov]

http://stackoverflow.com/questions/2620444/how-to-prevent-a-dialog-from-closing-when-a-button-is-clicked