Simple alarm clock app implemented in Android Studio
Using TimePicker as the primary UI element, this app allows users to start and stop an alarm with a handful of audio options from the Spinner-based drop-down menu. In this case I used soundbytes from the movie Step Brothers as a placeholder, but these could easily be replaced with any other sounds. Notifications are supported, so even when off-screen the user will be given the option to turn off the alarm when it is triggered.
On opening the app and selecting alarm audio: