[android-developers] Re: why am I receiving location updates without WakeLock if the device is put to sleep?

[ste1024]

Am Mittwoch, 9. Mai 2012 16:11:56 UTC+2 schrieb Nadeem Hasan:
>
> Your phone is using wifi as the location source. If wifi is set to stay up 
>> during phone sleep, LocationManager will continue to provide updates unless 
>> you remove your location update subscription in onSuspend().
>
>
I tried the same this time with disabled WIFI, using the GPS location 
provider instead, and I also continued to receive location updates during 
sleep.

So does the location provider subscription keep the CPU awake all the time 
or only during certain intervals when it tries to get a location fix?

The LocationManager 
documentationis
 rather vague on that, it only mentions something like that in the 
documentation for 
public void addProximityAlert (double latitude, double longitude, float 
radius, long expiration, 
PendingIntentintent)
 :
>
> In case the screen goes to sleep, checks for proximity alerts happen only 
> once every 4 minutes. This conserves battery life by ensuring that the 
> device isn't perpetually awake. 
>
However, I am not using that function, and also I get uptates as often as 
once per minute.

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[android-developers] Re: why am I receiving location updates without WakeLock if the device is put to sleep?

[ste1024]

Am Mittwoch, 9. Mai 2012 16:11:56 UTC+2 schrieb Nadeem Hasan:
>
> Your phone is using wifi as the location source. If wifi is set to stay up 
> during phone sleep, LocationManager will continue to provide updates unless 
> you remove your location update subscription in onSuspend().


How is WiFi configured to always stay up during sleep? Is the mere fact of 
someone listening for location updates enough or is there some device 
setting for this?
And how would the situation be if WiFi was turned off and GPS or network 
provider via cell network would be used?

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[android-developers] Re: why am I receiving location updates without WakeLock if the device is put to sleep?

[Nadeem Hasan]

Your phone is using wifi as the location source. If wifi is set to stay up 
during phone sleep, LocationManager will continue to provide updates unless 
you remove your location update subscription in onSuspend().

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[android-developers] Re: why am I receiving location updates without WakeLock if the device is put to sleep?

[ste1024]

Unfortunately shutting down the Google Maps app (which killed the running 
service) did not help. After doing that, starting my app and pressing Power 
to go back to sleep, I still got location fixes.

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[android-developers] Re: why am I receiving location updates without WakeLock if the device is put to sleep?

[ste1024]

Am Dienstag, 8. Mai 2012 13:22:04 UTC+2 schrieb lbendlin:
>
> your location provider is network. Network means WiFi or cellular.  One of 
> the two is on while the device is asleep, and possibly you have another 
> application that uses location updates (so you may be getting them 
> passively)
>

I have a strong suspicion that the Google Maps app is the "culprit" here.
When I reboot the phone and check the running services (before even 
starting my app), I see that NetworkLocationService of the Google Maps app 
is running. That app cannot be uninstalled, btw., at least not on my device 
- I can only uninstall updates.

Btw. I have found an solution for my second question here: 
https://github.com/commonsguy/cwac-locpoll

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[android-developers] Re: why am I receiving location updates without WakeLock if the device is put to sleep?

[lbendlin]

your location provider is network. Network means WiFi or cellular.  One of 
the two is on while the device is asleep, and possibly you have another 
application that uses location updates (so you may be getting them 
passively)

On Monday, May 7, 2012 2:32:25 AM UTC-4, ste1024 wrote:

> In developing an app that needs to get periodic location fixes, I ran 
> across several issues that are unclear to me.
>
> The application currently does not use any WakeLocks.
> Yet even if the device is put to sleep (e.g. via pressing the power 
> button), I seem to be able to get location fixes.
>
> I have built a counter into the app that increments on each location fix.
> I reset the counter, press the power button power to put the device to 
> sleep, move it to a differen location and let it sit there for several 
> minutes.
> After several minutes I come back, wake up the device and check the 
> counter. And it often is not zero, but shows that multiple location updates 
> were received while it was supposed to be "sleeping".
>
> Location provider is network, update distance and interval are 1 meter / 1 
> minute.
> The device (HTC Desire HD with Android 2.3.5) has no SIM card. WiFi is 
> enabled and the device is _not_ connected via USB
> (USB debugging is enabled, though).
>
> So my first question is: why does this happen without a WakeLocks being 
> held?
>
> Also on the topic of WakeLocks, assuming the first issue has been cleared 
> up and I really have to use WakeLocks:
> Can I have something that periodically wakes up the CPU to get a new 
> location fix, keeps the device awake while we try to get the fix
> (or until a max. timeout has been reached), then goes back to sleep, then 
> wakes up later, gets the next fix, sleeps, etc.?
> Or do I have to hold the WakeLocks all time (which I can imagine has 
> adverse effects on battery life)?
>
>

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