How to set application as screen saver in android?

hey hi, i had created an simple digital clock application. I want to display this application as screen saver. In other words want to launch this application automatically when the system is idle for a specific time duration. The theme i had applied on my application doesn't allow title bar and status bar. Hence, it cover the complete screen but i don't know how to launch it as screen saver or detect idle system and record system i开发者_开发问答dle time to launch my application automatically when an certain time limit is crossed. thanks in advance.... Ashwani

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look at this two answers

Custom Android Screensaver (or sleep screen)

Android Screen Saver Sample Code