Assume I have an app that, although 95% of the time it will be used by a single user, will occasionally be passed to a supervisor or somebody similar who will do a logout/login/do-some-activity/logout cycle before handing it back to the original employee using the device. On a "logout", I'd like to kill/finish all the running activities (allowing them to do their cleanup), then essentially "start fresh" without having to litter all the activities with calls to specifically test to see if we've done a logout since the last time we were brought to the front of the user's attention.
Alternatively, I could just kill the process (I'm assuming a System.exit() works), but that would have the undesirable effect of bringing the user back to the Home screen and forcing them to select the app, which from a UX perspective feels awkward and amateurish. There's also the diagnostician in me that wants to be able to find all open Activities and finish() them if we get a low-memory signal, but that's really a distant second to the above use case. Ted Neward Java, .NET, XML Services Consulting, Teaching, Speaking, Writing http://www.tedneward.com > -----Original Message----- > From: [email protected] [mailto:android- > [email protected]] On Behalf Of Romain Guy > Sent: Wednesday, June 02, 2010 1:26 AM > To: [email protected] > Subject: Re: [android-developers] Re: List of all instantiated > Activities > > Let's step back a little bit. Ted, what is it you are trying to do? > > On Wed, Jun 2, 2010 at 1:24 AM, Guillaume Perrot > <[email protected]> wrote: > > I already made something similar (limited to the current activity) > and > > I did not find another way to access the activity instance. > > To limit errors, I made my modifications in life cycle callbacks and > > users have to inherit my Activity classes (I made a full set for > > convenience, there are 9 Activity types) instead of the standard > ones. > > You could place your code in onCreate, if they inherit your class > they > > can't miss it. > > Of course the developer still have to ensure it does not miss an > > inheritance change but it's easier than adding a snippet of code > > everywhere and more object friendly. > > > > On 2 juin, 08:35, "Ted Neward" <[email protected]> wrote: > >> Anybody know an easy way for an app to find all the instances of all > the > >> Activities currently alive in the current process? > >> > >> Yes, I could register each one into a static List<> someplace from > the > >> constructor of each Activity, but that requires developers to > remember to > >> put that code into every Activity constructor, which is going to > eventually > >> miss one or two (not to mention keep the Activity alive longer than > it > >> should be, though that could be fixed by holding WeakReferences > instead of > >> strong ones, but that still misses the point), and that's going to > mean one > >> or two escape the list. I'd prefer to have a way to see all of them > from > >> Android's/Dalvik's point of view. > >> > >> Ted Neward > >> > >> Java, .NET, XML Services > >> > >> Consulting, Teaching, Speaking, Writing > >> > >> <http://www.tedneward.com>http://www.tedneward.com > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to android- > [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 > > > > > > -- > Romain Guy > Android framework engineer > [email protected] > > Note: please don't send private questions to me, as I don't have time > to provide private support. All such questions should be posted on > public forums, where I and others can see and answer them > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to android- > [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 -- 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
