You should not do it.
The user sets up "Regional and Language Options" of the systems and adds languages, defined what keyboard layout to use and what keys use to switch between input languages. It really has nothing to do with your application. It should work with what the user enters.
[EDIT]
I did not pay attention that it's Android while writing about Windows-specific "Regional and Language Options". Anyway, setting up and switching keyboard layout and input language is always done by the user of OS.
[END EDIT]
You can develop and provide a virtual keyboard, but this is a different story.
[EDIT]
…Yes, a different story. There is a lot of information of virtual keyboards:
http://en.lmgtfy.com/?q=virtual+keyboard+android[
^].
—SA