we need to control the screen off/on...Anyone know the API to implement it? Give me a hand...

Hi.
Try this snippet:
@Override
protected void onCreate(Bundle savedInstanceState) {
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "DoNotDimScreen");
}
Also in manifest.xml
<uses-permission android:name="android.permission.WAKE_LOCK" />

Refer to http://developer.android.com/reference/ ... nager.html

Don't forget to make: after you have finished.

Or, you may also wake up your device whenever you want with auto-release by:

where the SCREEN_TIMEOUT is the timeout when the wake lock will be released (i.e. total time before sleep is SCREEN_TIMEOUT + default device screen timeout .

thanks for that snippet, it is very useful as the method I had been going by relies on a somewhat over-complex broadcast receiver!

quick followup. I've been trying to get this working consistently. I want to have the device sleep quicker than the timeout settings. this is because i'm calling up an activity that disables keyguard at screen off. so any key will make the screen wake back up. there's no way to stop that from happening but i am confident I could get it to turn the screen back off faster than than the default timeout. My code has certain keys trigger the shorter timeout, and others call finish on the replacement lockscreen activity. I had an implementation of this working at one point just with wakelocks and manual releases, but it no longer seems to be working.