Well, the app reliably works while other activities are running and when 
the phone is locked.  I will have it on Google Play next week and you can 
try it for yourselves (for a couple bucks).  It's called SignalBeacon.  You 
send the phone a text and you get back the phones location.  It doesn't 
have to be running.  In fact it never has to run.  It just has to be 
installed on the phone.
Gary

On Thursday, February 28, 2013 8:53:21 AM UTC-7, [email protected] 
wrote:

> I have an app with a main activity that has no visible interface 
> (android:theme="@android:style/Theme.NoDisplay).  The app is  started by 
> receipt of an SMS message in a BroadCast activity which kicks off another 
> activity (also no GUI) that does work and then sends an SMS message.  It 
> works very well; actually better than I had expected because it runs even 
> if other apps are running a foreground activity.
>  
> Now I'm familiar with the Android Activity Lifecycle but I guess this 
> means that Android (I'm using 2.33) can run "many" activities "at once."  
> Even when I'm running a very active GPS tracking application that is 
> writing layers on a mapview, my "no-display" app starts does his work and 
> sends the results out on an SMS message.  The tracking app that was running 
> never even blinked.
>  
> I don't have any problem (at least not programming related), I'm just 
> curious why this works.
> Regards,
> Gary
>  
>  
>

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