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Activity(?) with no UI

 
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Android Google Web Toolkit Mac Eclipse IDE Ubuntu Java
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On my Android, the max screen time out is 10 minutes which really doesn't help when I am running map navigation. Looking at the API it seems manipulating the Settings.System.SCREEN_OFF_TIMEOUT to -1 should set the display to permanently stay on.

I am thinking the application would have a home screen icon. Touching it would toggle between stay on/whatever time out limit existed before. To achieve this, what should I be writing? Activity? Widget? How do I achieve this functionality, where some code is executed without showing any UI?
 
Maneesh Godbole
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Ok it seems setting the application theme to @android:style/Theme.Translucent.NoTitleBar does the trick
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