Android launch activity on the top of the password -

question : how able on android trigger intent on top of locked screen ?

behaviour wanted : pending intent triggered while phone asleep, phone wake , launch activity, user closes activity , has "enter password" screen if there one.

example : android standart alarm/clock.

when looking part of android, try grepcode :

google://alarm clock grepcode

gives : http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/1.5_r4/com/android/alarmclock/alarmreceiver.java