That's what the documentation says, but that's not what the ActivityManager does.
>From what I can see, the problem lies in the following code: http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;f=services/java/com/android/server/am/ActivityManagerService.java;h=a473db2740abe124b7867d0ea6313eb8c0ca7a7d;hb=5550ef48739a7bb16f80aa6b10e9c151b1438163#l3333 The if-statement on line 3333 causes the activity stack to be cleared if the launch mode is singleTask, regardless of the state of FLAG_ACTIVITY_CLEAR_TOP... In my opinion, this is a bug, as the documentation you quoted clearly says that the stack should be preserved on a singleTask activity. I'm going to submit a patch for this, but I'm writing here so others who find this thread know that this behaviour is not their fault but a bug. // Johan On Sep 24, 10:02 pm, "Justin (Google Employee)" <j...@google.com> wrote: > Fromhttp://developer.android.com/guide/topics/fundamentals.html#acttask > > "As noted above, there's never more than one instance of a > "singleTask" or "singleInstance" activity, so that instance is > expected to handle all new intents. A "singleInstance" activity is > always at the top of the stack (since it is the only activity in the > task), so it is always in position to handle the intent. 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.)" > > Cheers, > Justin > Android Team @ Google > > On Sep 24, 11:45 am, justinh <henderson.jus...@gmail.com> wrote: > > > > > When users press on your icon again to "come back" they are launching > > your activity, not the settings activity. Where do you start the > > settings activity in your code? If it's outside of the onCreate/ > > onStart/onResume methods then the user will have to repeat that action > > to get back there. > > > On Sep 24, 2:58 am, play_net <tiandiji...@gmail.com> wrote: > > > > My manifest: > > > <activity android:label="@string/app_name" > > > android:name="MainUI" android:screenOrientation="landscape" > > > android:configChanges="orientation|keyboardHidden" > > > android:launchMode="singleTask"> > > > <intent-filter> > > > <action android:name="android.intent.action.MAIN" /> > > > <category > > > android:name="android.intent.category.LAUNCHER" /> > > > </intent-filter> > > > </activity> > > > <activity android:label="@string/settings_label" > > > android:name=".view.Settings" android:configChanges="orientation| > > > keyboardHidden"> > > > </activity> > > > > I press program's icon to start my program,and then open the > > > Settings activity through startActivityForResult(intent, SETTINGS). > > > Now i press the home key and start my program through program's > > > icon, at this time the Settings actitity will run OnDestroy() and be > > > destroyed. I can't understand why Settings activity is be destroyed > > > automatically? How can I make Settings activity still focus when users > > > come back. > > > > Thank all. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
