There was another thread about this recently. This message summarizes the behavior with singleTask
http://groups.google.com/group/android-developers/msg/471bef9e235f6c65 In short, with launchMode=singleTask the behavior after re-visiting Home is different depending on whether the activity at the top of the stack was started implicitly (with an intent filter) or explicitly (with a class name). ASFAIK this is not documented. Not clear if it is a bug or not. On Feb 26, 1:05 am, Neha <nehas...@gmail.com> wrote: > Hi, > > Does anyone have any updates on this issue? I'm facing the same > problem with my activity when launchMode=singleTask. > - Launcher -> Activity A (singleTask) -> Activity B (standard) > - Press HOME > - Long-press HOME or go to Launcher > - Activity A (B's onDestroy called) > > "adb shell dumpsys activity" shows only Activity A in the stack for > this task. The intent flags are: > Long press HOME - FLAG_ACTIVITY_NEW_TASK, > FLAG_ACTIVITY_BROUGHT_TO_FRONT and FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY > Launcher - FLAG_ACTIVITY_NEW_TASK, FLAG_ACTIVITY_BROUGHT_TO_FRONT and > FLAG_ACTIVITY_RESET_TASK_IF_NEEDED > > Any pointers on how to fix this would be helpful. > Thanks! > > On Feb 17, 10:41 pm, Dianne Hackborn <hack...@android.com> wrote: > > > When you say "launch" do you mean launching from Eclipse? If so, there is a > > bug in older SDKs where this would use the wrong intent so when you later > > launch it from the launcher you would get a new task. > > > You can use "adb shell dumpsys activity" to see the current state of the > > activity stack at whatever point you want to help diagnose what is going on. > > > On Thu, Mar 26, 2009 at 8:55 AM, jseghers <jsegh...@cequint.com> wrote: > > > > The code that starts the .About activity is: > > > protected void startAbout() > > > { > > > Intent aIntent = new Intent(this, About.class); > > > startActivity(aIntent); > > > } > > > > The Manifest entries for .UserLaunch and .About are in my original > > > post. > > > The intent that returns the task to the front is generated by the > > > Launcher. > > > > What flags do I need to set (and where) to prevent this from > > > happening? Is one of the default values causing it? > > > > My test case here is: > > > 1) launch .UserLaunch from the launcher > > > 2) start .About > > > 3) hit Home key > > > 4) launch .UserLuanch from the launcher > > > > There are no long delays in any of this, so the 30 minute auto-clear > > > should not be invoked. > > > > - John > > > > On Mar 25, 12:15 pm, Dianne Hackborn <hack...@android.com> wrote: > > > > That means you are using some CLEAR_TOP or finish flag in an intent or > > > > in > > > > the manifest. Or possibly it has been > 30 minutes since the app was > > > last > > > > launched, in which case the system will restart it automatically. > > > > > On Wed, Mar 25, 2009 at 11:12 AM, jseghers <jsegh...@cequint.com> wrote: > > > > > > Thank you for your reply! > > > > > > I am seeing am_task_to_front followed by am_finish_activity. > > > > > I found the event-log-tags file and apparently the reason is "clear". > > > > > What is not clear to me though is why the activity manager thinks it > > > > > should clear the the task. > > > > > > The relevant lines of the log are: > > > > > I/am_on_resume_called( 94): com.android.launcher.Launcher > > > > > I/dvm_gc_info( 94): > > > > > [7017575181485176104,-9053780441931634733,-4010030953047537782,8554533] > > > > > I/force_gc( 209): bg > > > > > I/dvm_gc_info( 209): > > > > > [7163384747111232651,-9098816781953771608,-4017912252395432053,7919391] > > > > > I/am_pause_activity( 52): > > > > > [1128800640,com.android.launcher/.Launcher] > > > > > I/am_task_to_front( 52): 3 > > > > > I/am_finish_activity( 52): > > > > > [1129575992,3,com.cequint.cityid/.About,clear] > > > > > I/am_destroy_activity( 52): [1129575992,3,com.cequint.cityid/.About] > > > > > I/am_new_intent( 52): > > > > [1129518888,3,com.cequint.cityid/.UserLaunch,android.intent.action.MAIN,,, > > > > > 274726912] > > > > > I/am_on_paused_called( 94): com.android.launcher.Launcher > > > > > I/am_resume_activity( 52): > > > > > [1129749080,3,com.cequint.cityid/.UserLaunch] > > > > > I/am_on_resume_called( 209): com.cequint.cityid.UserLaunch > > > > > I/dvm_gc_madvise_info( 94): [290816,245760] > > > > > I/dvm_gc_madvise_info( 209): [352256,241664] > > > > > I/force_gc( 94): bg > > > > > > - John > > > > > On Mar 25, 10:16 am, Dianne Hackborn <hack...@android.com> wrote: > > > > > > You can do "adb logcat -b events" to see the event log which will > > > include > > > > > a > > > > > > line the activity manager prints when finishing an activity, with > > > > > > the > > > > > reason > > > > > > why it is doing it. > > > > > > > On Tue, Mar 24, 2009 at 7:24 PM, jseghers <jsegh...@cequint.com> > > > wrote: > > > > > > > > I am just starting on an Android app and I am puzzled about why my > > > > > > > Task activity stack is being reset any time the application is > > > > > > > launched from the Home screen. > > > > > > > > I used the ADT tools to create the application in Eclipse. > > > > > > > The main activity is ".UserLaunch" and it starts the activity > > > ".About" > > > > > > > when the user presses a button. > > > > > > > If the user then presses HOME and then relaunches the app, > > > .UserLaunch > > > > > > > is displayed and is the only thing on the stack. > > > > > > > > .UserLaunch has the launchMode singleTask. .About is standard. > > > > > > > According to the documentation at > > > > > > >http://developer.android.com/guide/topics/fundamentals.html#lmodes: > > > > > > > > "However, a "singleTask" activity may or may not have other > > > > > > > activities above it in the stack. If it does, it is not in > > > > > > > position > > > to > > > > > > > handle the intent, and the intent is dropped. (Even though the > > > intent > > > > > > > is dropped, its arrival would have caused the task to come to the > > > > > > > foreground, where it would remain.) " > > > > > > > > The Task stack should be brought to the foreground and .About > > > should > > > > > > > still be displayed. > > > > > > > > I added Logging to all of the lifecycle events (edited to remove > > > > > > > timestamps and shorten DEBUG/ and INFO/ to D/ and I/) and you can > > > see > > > > > > > that when HOME is pressed, .About cycles through onPause and > > > > > > > onStop > > > > > > > (as expected). Then when the app is again launched, .About is > > > > > > > destroyed and .UserLaunch is restarted > > > > > > > > D/UserLaunch:(670): onCreate() > > > > > > > D/UserLaunch:(670): onStart() > > > > > > > D/UserLaunch:(670): onResume() > > > > > > > I/ActivityManager(52): Displayed activity > > > > > > > com.cequint.cityid/.UserLaunch: 4910 ms > > > > > > > I/ActivityManager(52): Starting activity: Intent { comp= > > > > > > > {com.cequint.cityid/com.cequint.cityid.About} } > > > > > > > D/UserLaunch:(670): onPause() > > > > > > > D/About(670): onCreate() > > > > > > > D/About(670): onStart() > > > > > > > D/About(670): onResume() > > > > > > > I/ActivityManager(52): Displayed activity > > > com.cequint.cityid/.About: > > > > > > > 1031 ms > > > > > > > D/UserLaunch:(670): onStop() > > > > > > > I/ActivityManager(52): Starting activity: Intent > > > > > > > { action=android.intent.action.MAIN categories= > > > > > > > {android.intent.category.HOME} flags=0x10200000 comp= > > > > > > > {com.android.launcher/com.android.launcher.Launcher} } > > > > > > > D/About(670): onPause() > > > > > > > D/About(670): onStop() > > > > > > > D/dalvikvm(670): GC freed 413 objects / 34128 bytes in 72ms > > > > > > > I/ActivityManager(52): Starting activity: Intent > > > > > > > { action=android.intent.action.MAIN categories= > > > > > > > {android.intent.category.LAUNCHER} flags=0x10200000 comp= > > > > > > > {com.cequint.cityid/com.cequint.cityid.UserLaunch} } > > > > > > > D/About(670): onDestroy() > > > > > > > D/UserLaunch:(670): onRestart() > > > > > > > D/UserLaunch:(670): onStart() > > > > > > > D/UserLaunch:(670): onResume() > > > > > > > > Here is the relevant section of the Manifest: > > > > > > > > <application android:icon="@drawable/icon" android:label="@string/ > > > > > > > app_name"> > > > > > > > <activity android:name=".UserLaunch" > > > android:label="@string/app_name" > > > > > > > android:launchMode="singleTask" > > > > > > > > <intent-filter> > > > > > > > <action android:name="android.intent.action.MAIN" /> > > > > > > > <category android:name="android.intent.category.LAUNCHER" /> > > > > > > > </intent-filter> > > > > > > > </activity> > > > > > > > <activity android:name=".About" android:launchMode="standard"> > > > > > > > </activity> > > > > > > > </application> > > > > > > > > Anyone have any ideas why this is always resetting the Activity > > > Stack? > > > > > > > -- > > > > > > 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. All such questions should be posted on > > > public > > > > > > forums, where I and others can see and answer them.- Hide quoted > > > > > > text > > > - > > > > > > > - Show quoted text - > > > > > -- > > > > 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. All such questions should be posted on public > > > > forums, where I and others can see and answer them.- Hide quoted text - > > > > > - Show quoted text - > > > --~--~---------~--~----~------------~-------~--~----~ > > > 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 > > > -~----------~----~----~----~------~----~------~--~--- > > > -- > > 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
