I'm trying to implement a times WakeLock in my Application, so this is
not a Service.
I want the wakelock to simply prevent screen dimming for 3 min.
Looking through the docs, this seems simple enough, but I seem to
randomly encounter a Under-Locked exception that I cannot pinpoint.
Here is my WakeLock-related code:
in onCreate:
...
PowerManager pm = (PowerManager)
getSystemService(Context.POWER_SERVICE);
mWakeLock =
pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, TAG);
// Adjust time to include user's setting
int timeout = WAKELOCK_TIME -
Settings.System.getInt(getContentResolver(), SCREEN_OFF_TIMEOUT, 0);
if (timeout > 0) {
mWakeLock.acquire(timeout);
}
...
in onDestroy:
if (mWakeLock != null && mWakeLock.isHeld() == true) {
try {
mWakeLock.release();
} catch (Exception e) {
// TODO Auto-generated catch block
//e.printStackTrace();
}
}
super.onDestroy();
As you can see, I wrap the release and try to only execute it when
necessary as a clean up only. I'm assuming that since I'm aquiring
with a timeout, the PowerManager will handle the release in most cases
when the timeout expires.
I don't have a copy of the logcat at the moment, but what seems to
happen is I get the Under-Locked exception randomly, and at random
times (it's not always when WAKELOCK_TIME elapses). The strange thing
is that the exception does not point to my code - all the entries
point to "internal" Android code.
It's hard to find examples of other people using aquire with timeouts.
Any ideas what I could be doing wrong here?
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