Question

I’m trying to put a device into sleep mode for a certain amount of time, say x, by calling..

powerManager.goToSleep(xNumberOfMilliseconds);

However, the api never seems to work consistently, and never for any amount of time greater than 1000 milliseconds. I’m stumped. I have the appropriate permissions, my application has its sharedUserId set to “android.uid.system” in the manifest, and the application is signed with the same key the firmware itself is signed with (platform key).

It is a pretty simple API call, so I don’t really know what on earth is going wrong. I’ve been able to get this problem on both a device running android 2.3 and a device running android 3.2.

Any ideas?

Answer 1

I have done this but it works at random on several android 4.0.x plaforms.

powerManager.goToSleep(SystemClock.uptimeMillis() + timeMs)

Did anyone managed to use the method the way he has intended to?

Edit:
It seems the right answer was what figure in the code below:

public void sleepFor(long time, Context context) {

    //Create a new PendingIntent, to wake-up at the specified time, and add it to the AlarmManager
    Intent intent = new Intent(context, this.getClass());
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

    PendingIntent wakeupIntent = PendingIntent.getActivity(context, CODE_WAKE_UP_DEVICE, intent, PendingIntent.FLAG_CANCEL_CURRENT);
    // CODE_WAKE_UP_DEVICE is a dummy request code.

    AlarmManager am = getAlarmManager();
    am.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + time, wakeupIntent);

    powerService.goToSleep(SystemClock.uptimeMillis() + 1);
}