Android Clock Application: acceses which existing libraries?
<p>I am trying to use the existing alarm clock code available <a href="http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/2.2_r1.1/com/android/alarmclock/ClockPicker.java" rel="nofollow">here</a>
Does anyone know what layers in the android framework are used/touched upon in this application? 
Being more specific, I want to know if this is just a UI application or if it uses some other existing libraries in the android framework( Like middleware libraries etc)</p>
