Android Custom Keyboard

Write an App that on an EditText Field, displays a custom keyboard. The keyboard will only show the chars A->Z, backspace,a Mic option, done and nothing else. No Keyboard settings, no Numeric options etc. You can use something like [login to view URL] as a basis, but the App has to run on Android 5.1.1 and I get the source code. This should be pretty easy to do for the right person, it should only take a few hours to get this working. It's just a prototype App to prove the concept, and the keyboard has to work in both Landscape and Portrait modes.