Android :: SingleTask / Activity Stack Not Preserved?
Feb 18, 2010
I have an activity, ActivityA, and its launchMode is set to "singleTask".I start the application from the app tray. ActivityA launches ActivityB from a button click. ActivityB is a normal activity with no launchMode set ("standard").With ActivityB on top of the activity stack, I hit the home button, then resume the app, I see ActivityA instead of ActivityB when resumed.Shouldn't the history stack be preserved in this case, and B be showing? When I resume, I see A get onNewIntent() called, and I'm not sure why this is happening. I thought the stack would be preserved.
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Mar 10, 2010
My main activity A has as set android:launchMode="singleTask" in the manifest. Now, whenever I start another activity from there, e.g. B and press the HOME BUTTON on the phone to return to the home screen and then again go back to my app, either via pressing the app's button or pressing the HOME BUTTONlong to show my most recent apps it doesn't preserve my activity stack and returns straight to A instead of the expected activity B.Is there a setting I'm missing or is this a bug? If the latter, is there a workaround for this until the bug is fixed?
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Sep 16, 2009
In the documentation it is stated that an activity with launchMode="singleTask" is always at the root of the sctivity stack. However, when I run my "singleTask" activity for a few scenarios and monitors behaviour with "adb shell dumpsys activity" I can see it placed both at the top of the stack (with numActivities=2) and in the middle of the stack (with numActivities=3). The activity at the root (frontOfTask=True) has a "normal" launchMode.Is the documentation incorrect or am I missing something?
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Apr 22, 2010
So I have a MapActivity that runs an asynchtask that occasionally updates what exactly it's displaying on the map (via a string). I originally pass this string in from the intent when the activity is first created. And then if you click on one of the drawables on the map, it opens a new activity, which can then create a new mapview (same class) with a different string setting. The problem I have is that I only want one instance of the mapview to be running at once. Thus I set android:launchmode="singletask" in the manifest. This works in that it brings the mapactivity to the front, but is there any way to send it a new intent bundle to get a new setting for the string it needs? I tried regetting the extras from the bundle, but it seems to retain the old bundle, not the new intent that was passed to it. I'm not sure I want to do startActivityForResult because the 2nd activity may or may not want to update the original activity. I hope that made sense. I can post code if necessary, but I think that should explain my situation.
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Feb 17, 2010
I'm not sure why onPause() is not called in the following scenario.
Here's my activity:
CODE:.......................
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Nov 2, 2009
There is a stack of activity i want to call the activity from that stack , My question is that is it possible to check from that stack and call that intent.When i press home button and again when i press the executable it should start the activity where i have left .Is it possible?Any example related to the same would be great help
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Mar 3, 2010
So I have an app with Activity A. The layout on the activity is dynamic genearted. So it's possible that on Activity A a user hits a button that goes to "A" and the new page looks different, then a user clicks another button to go to "A" again. Now I have 2 Activities in the history stack. A, A, and currently on A. Is it possible that if a user clicks a button that the whole Activity stack is cleared in a scenario such as this?
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Apr 27, 2010
How to finish any previous activity in application stack (at any level , I mean not immediate parent) , from current activity like on some particular event I want to invalidate this previous activity?
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Jul 26, 2010
How can I make sure I only retain one copy of an activity on the stack when called from non-activity? When called from an activity I can just add the FLAG_ACTIVITY_REORDER_TO_FRONT flag to the Intent, but how can I do this from e.g. a widget or a notification?
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Dec 22, 2009
All the current discussions involves clearing all activites above an existing activyt, but I'm trying to find a way to clear all the activities before the latest activity in the stack. So my scenario is A -> B -> C and then when a user goes to Activity D, activies A,B,C should be cleared from the activity stack. FLAG_ACTIVITY _CLEAR_TOP seems to only clear any activites above an existing activity. Anybody run into this scenario and found a solution?
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Sep 17, 2009
i want to clear the activity stack and replace it with a new activity as the root activity, even if that activity exists somewhere on the stack (or not). i see FLAG_ACTIVITY_CLEAR_TOP and FLAG_ACTIVITY_NEW_TASK, but it's not obvious to me how to use those in conjunction to achieve what I want. it's like i want to completely restart the task with some activity that i specify as the new root.
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Aug 4, 2009
i have a set of activities on my stack Say A-->B-->C. when i launch the activity named 'D' it should get fired as the root activity of my application and all the other activities(A,B,C) should get cleared from my stack once Activity D is launched.Can any one tell me as how to do this
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Apr 23, 2010
I have the following activity structure in my application A simple "splash screen" activity is started when the application is fired up (let's call it "Splash"). This activity starts the main activity when the user presses a button (I will call it "Main"). Main can in turn start two activities from the menu. The first activity presents a simple form (let's call this one "Form"), the second is a MapActivity that presents a map (it is called "Map").
Main, Form, and Map are declared exactly the same in the manifest:
<activity android:name="fully qualified activity class"
android:screenOrientation="landscape"
android:configChanges="keyboard|keyboardHidden|orientation"
> <intent-filter>
<action android:name="android.intent.action.DEFAULT" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter> </activity> When Main is active and I start Form and press "back", Main comes up again. Pressing "back" again brings up "Splash". Nothing strange here.Now comes the strange part: when I am in Main, start Map, and press "back", Main comes up as expected. But pressing "back" again just restarts Main. A second press on "back" is needed to bring me back to Splash!So it seems that starting the Map activity somehow results in Main ending up on the activity stack twice while starting the Form activity does not! Both Form and Map are started like this: start Activity(new Intent(this, MyActivity.class)); I don not catch the back key in any activity.Any clues on what is going on or how to debug this?
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Nov 4, 2009
I'm new android and i want to know how to remove more than one activity from stack. We use finish() for closing particular activity but i wanna close more than one activity underneath it, at a time.
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Nov 3, 2009
Is there a way to clear our Activity stack? For example, a user in my app progresses through these activities, one is launched from the previous activity: ActivityA -> ActivityB -> ActivityC if the user is now looking at ActivityC, and they hit the back button, they will go back to ActivityB. Is it possible to add a menu to ActivityC where the user can clear their activity stack, and then launch a new instance of ActivityA? This would be so the user can jump to a particular activity in my application without getting confused with the back button + history,
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Sep 20, 2010
My understanding is to quit the app I need to call finish() on all activities up to the root activity. However, how do I navigate up activities in app activity stack from current active activity?
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Sep 1, 2010
how can I assure I always go back clicking on custom menu option to previous activity. I think it is a good idea to start new activities by startActivity(context, XActivity.class) but then when option is selected I should call finish on that activity or again call startActivity(this, previousActivityName)?on the other hand android has all activities on a stack so clicking goback button on a phone I will always go back to previous view, so how can I get this stack.
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Jan 7, 2010
I have 5 Activities in sequence Activity1, Activity2, Activity3, Activity4, Activity5.When I am at Activity5 there is a button through I can go to Activity2.Means jump from 5 to 2 with removing the Activity3 & 4.How can I do that?
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Sep 22, 2009
Activities: A & B are activities that once you have navigated away from them it's not logical that you can get back to them using the back button. C X are activities that follow the usual "can go back to where you came from" flow.App flow: * Launch app from Home -> starts A * From A start B * Finish A (removes it from stack) * From B start C * Finish B (removes it from stack) * From C start D * From D start E.Once the user has reached E, the activity stack looks like this: C -> D -> E. Can I somehow reset the whole stack so it starts again at A so it's as the user just launched it from Home (so that C... E are removed from the history stack)?
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Aug 1, 2009
I have 3 activities, I want to allow only one of each of the activities to be on the history stack at one time.A>B>C>[GO TO B] gives me A>C>B using FLAG_ACTIVITY_REORDER_TO_FRONT flag.Now the problem is that when I call B from C I want B to be restarted not just brought to the front.how can I do that?
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Dec 15, 2009
Actually I was trying to automate some stuff on my android emulator. I start an activity through adb shell using "am" command, but when the activity starts do I have a way out to know that my activity is the one which is at the top & has the focus.I googled about it a lot but couldn't find the right way to do this.
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Dec 3, 2009
I'm having trouble with my activities when they go in the background. I have two activities, A and B. Only A can launch B (manifest copied below).This is very confusing. It's like Android knows my app is running, and puts a new instance of A on top of the old B instance running. I'd just expect that the application gets paused in-place, and whenever the user hits the app icon again, it just picks up where it left off (in this case, just show B again!) Below is the manifest, and the activity classes for this test are completely empty (except A which has a button to launch B).
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Jun 16, 2010
My app has a single entry activity called "Main". In "Main" I call one of three other activities A, B, or C (based on a preference) and then immediately exit/finish"Main" so that only A, B, or C are active.I also have a permanent notification in the notification bar that users can pull down (at any time) to conveniently restart my App (calls intent with "Main" component).The problem is that if my app is already running and users pull down the notification and restart, I get A or B or C running on top of the previous activity (also A, or B, or C). How can I avoid this (i.e. reuse the activity on top of the stack)?I've tried Intent.FLAG_ACTIVITY_* and nothing seems to work. I've tried launchModel in the Manifest and it also didn't seem to work.
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Sep 8, 2010
I have pushed one Activity to make few changes. Now I want to pass all the changes to the previous(below) Activity. I dont want to create Activity again;and intead i want to access the previous activity.
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Apr 7, 2010
Is there a way to vizualise the activity stack, at some moment during debug, or normal run ?
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Apr 7, 2010
Android - Can I force BACK button to go 2 steps back in the Activity stack with some kind of code? I know I can override the onKeyDown method but I want BACK to do it's thing, just twice!
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Jan 6, 2010
I have three activities. Activity A start activity B by the method startActivityForResult, and Activity B start activity C by the method startActivity. Then, after starting activity C, activity B kill himself by finish(). Now the task stack stored two activities: A and C. My question is: how can I finish activity A when I finish activity C. or how can I clear the whole stack of the task.
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Mar 14, 2010
I just started developing a simple Android application while I'm still learning its platform. I'm using Eclipse IDE with the ADT plugin 0.9.6 and I need to know if it's possible to view the activity stack that is associated with a Task. Is there any way through the DDMS tool or through any other technique?
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Dec 17, 2009
When debugging I've sometimes wanted a tool that would list running tasks and show which activities are on the history stack for each task. I can get a list of tasks by calling ActivityManager.getRunningTasks(). Each ActivityManager.RunningTaskInfo object in the list gives me interesting information such as the base activity, top activity, and number of activities in the task. I haven't found a way to actually enumerate all the activities in the task's history stack. Is there a way to get at such information?
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Apr 4, 2009
I'm trying to create an activity which would be on top of other activities (a small dialog themed activity) and I want to get ALL key events to be ignored by my activity and handled normally by the activity beneath it. When I say all I mean the send, end and back keys too. Is this possible?I've tried setFocusable(false), setting the flag FLAG_NOT_FOCUSABLE, and adding a dummy onKeyListener but nothing doesn't seem to do the trick.
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