As I understand it you are right, you need to react to onPause in each activity (see also onSaveInstanceState()).
The reason behind this is an end-user Task can comprise more than one Applicaton/Process with each Application consisting of more than one Activity. To give a made up example (which may not be possible with the actual Andoid code base): 1) End-user starts MyApp with MyActivity1 2) In MyActivity1 the end-user selects somethings which starts GoogleMaps / GoogleMapsActivity1 with some push pin data from MyApp. 3) End-user selects on of the push-pins that causes Google Maps to start MyActivity2 (in MyApp). So now we have MyApp MyActivity GoogleMaps GoogleMapsActivity1 MyApp MyActivity2 4) MyApp/MyActivity2 could now display a web page etc. Any Application/Process which is not the current forground Activity is a candidate to be killed by the OS if resources get tight. So each Activity that pauses needs to save its state so that when the end-user presses the back key it can restore itself and resume where it left off. -- RichardC On Oct 9, 6:22 pm, David Bernstein <[email protected]> wrote: > How can an application detect when it's lost control of the screen? > The reason I ask is that my application has an appwidget whose visible > state should be consistent with user actions within the application. > In addition to the application exiting, I'd like to know when other > applications take over the screen. > > Simply noticing in onPause() in the root activity isn't enough because > the user can, for example, press the home key or receive a phone > call. Noticing in onPause() in every single activity is overkill > because the user will move between multiple activities in the same > application. > > If this is documented or discussed already, I'll humbly accept an RTFM > pointer, but I didn't find anything when I looked. > > Thanks. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
