We can make and run "cron-like program" by the AlarmManager on
Android.

But I think those are dangerous for we.

Because AlarmManager as stealthy as follows:
 * Not resident
 * Not shown in the Task Manager
 * No way to stop it (expect uninstall caco-program).
 * No way enumerate tasks that AlarmManager has.

As just described, we can make malware using AlarmManager easily. (ex:
http://isc.sans.edu/diary.html?storyid=10186)

How can I guard users from this problem?

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