[android-developers] Re: instance count violation
thanks a lot for the answers. i also came up with the solution to ignore this error. :) On Thursday, June 7, 2012 12:39:58 PM UTC+2, marcin kolonko wrote: hi, i have an app with two classes: *SelectItemActivity** extends **AbstractListActivity,* and * AbstractListActivity extends Activity* * * (~20 lines of code each) - not much to screw up i thought... links to pastebin: *AbstractListActivity* : http://pastebin.com/iKEa3d3a *SelectItemActivity : *http://pastebin.com/UC01gvTg *Menu*: http://pastebin.com/vjL1r28q now, when i click on the button in the actionbar, switch to landscape and then back to portrait, the app crashes and i get this error: *android.os.StrictMode$InstanceCountViolation: class ch.futurecom.MeetingMaid.view.SelectItemActivity; instances=2; limit=1* * * does anyone have a clue what's going on? thx -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: instance count violation
ok, i did some memory digging with ddms and memory analizer. and there' s weird behavior: when i run the garbage collector while in portrait mode (still the same case us in first post) and come back to portrait mode, nothing bad happens. the app behaves as it should. when i don't run the garbage collector, the app crashes with the instance count violation error. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: instance count violation
ok, i did some memory digging with ddms and memory analizer. and there' s weird behavior: when i run the garbage collector while in portrait mode (still the same case us in first post) and come back to portrait mode, nothing bad happens. the app behaves as it should. when i don't run the garbage collector, the app crashes with the instance count violation error. On Thursday, June 7, 2012 12:39:58 PM UTC+2, marcin kolonko wrote: hi, i have an app with two classes: *SelectItemActivity** extends **AbstractListActivity,* and * AbstractListActivity extends Activity* * * (~20 lines of code each) - not much to screw up i thought... links to pastebin: *AbstractListActivity* : http://pastebin.com/iKEa3d3a *SelectItemActivity : *http://pastebin.com/UC01gvTg *Menu*: http://pastebin.com/vjL1r28q now, when i click on the button in the actionbar, switch to landscape and then back to portrait, the app crashes and i get this error: *android.os.StrictMode$InstanceCountViolation: class ch.futurecom.MeetingMaid.view.SelectItemActivity; instances=2; limit=1* * * does anyone have a clue what's going on? thx -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: instance count violation
I remember seeing this in one of my apps in certain cases. My conclusion was that this might be a bug in strict mode code, and disabled it. Activity orientation changes are processed within a single message loop heartbeat, so it's entirely possible that the lifecycles of both activity instances overlap. -- K 2012/6/7 marcin kolonko makolo...@gmail.com ok, i did some memory digging with ddms and memory analizer. and there' s weird behavior: when i run the garbage collector while in portrait mode (still the same case us in first post) and come back to portrait mode, nothing bad happens. the app behaves as it should. when i don't run the garbage collector, the app crashes with the instance count violation error. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: instance count violation
On 7 June 2012 15:06, Kostya Vasilyev kmans...@gmail.com wrote: I remember seeing this in one of my apps in certain cases. My conclusion was that this might be a bug in strict mode code, and disabled it. Activity orientation changes are processed within a single message loop heartbeat, so it's entirely possible that the lifecycles of both activity instances overlap. +1 Setting launchMode to 'singleInstance' can solve this 'issue', as it will force each (re)created activity to launch in a separate task. However the wider issue to consider is that StrictMode.ThreadPolicy.Builder.detectAll() detects *potential* problems. The fact that once GCed the activity dissapears, means that it will get eventually cleared and is not a leak. Daniel 2012/6/7 marcin kolonko makolo...@gmail.com ok, i did some memory digging with ddms and memory analizer. and there' s weird behavior: when i run the garbage collector while in portrait mode (still the same case us in first post) and come back to portrait mode, nothing bad happens. the app behaves as it should. when i don't run the garbage collector, the app crashes with the instance count violation error. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Daniel Drozdzewski -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: instance count violation
RIght, the activity instance tracker depends on GC to decrement its value. https://github.com/android/platform_frameworks_base/blob/master/core/java/android/app/Activity.java#L732 https://github.com/android/platform_frameworks_base/blob/master/core/java/android/os/StrictMode.java#L2149 Using onDestroy/onCreate would let the count be more accurate during orientation changes... but won't track memory leaks caused by Context references, which probably is a more common issue. -- K 2012/6/7 Daniel Drozdzewski daniel.drozdzew...@gmail.com On 7 June 2012 15:06, Kostya Vasilyev kmans...@gmail.com wrote: I remember seeing this in one of my apps in certain cases. My conclusion was that this might be a bug in strict mode code, and disabled it. Activity orientation changes are processed within a single message loop heartbeat, so it's entirely possible that the lifecycles of both activity instances overlap. +1 Setting launchMode to 'singleInstance' can solve this 'issue', as it will force each (re)created activity to launch in a separate task. However the wider issue to consider is that StrictMode.ThreadPolicy.Builder.detectAll() detects *potential* problems. The fact that once GCed the activity dissapears, means that it will get eventually cleared and is not a leak. Daniel 2012/6/7 marcin kolonko makolo...@gmail.com ok, i did some memory digging with ddms and memory analizer. and there' s weird behavior: when i run the garbage collector while in portrait mode (still the same case us in first post) and come back to portrait mode, nothing bad happens. the app behaves as it should. when i don't run the garbage collector, the app crashes with the instance count violation error. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Daniel Drozdzewski -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com 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 android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: instance count violation
On Thu, Jun 7, 2012 at 7:29 AM, Daniel Drozdzewski daniel.drozdzew...@gmail.com wrote: Setting launchMode to 'singleInstance' can solve this 'issue', as it will force each (re)created activity to launch in a separate task. OMG, do NOT use singleInstance to solve the problem. This is a very special launch mode that has major subtle repercussions on the management and flow of your app that you almost certainly DO NOT WANT. And to be honest, it would have no impact on what is being reported here (a problem when rotating) because singleInstance doesn't impact the fact that the activity is being destroyed and recreated. -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. 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-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
