Android :: Activity History Stack Wrong Upon First Install On Device
Dec 4, 2009
Edit / Update:
As an update to the below problem, I found the exact action which causes it to happen.
Download an apk from a url through the android browser
Install the app.
After install, the app gives you two choices: "Open" or "Done".
If you choose "Open", the quirky behavior described below starts.
If you choose "Done", then launch the app from the app tray, it works fine.
So it seems like this problem is caused by using the "Open" button the browser provides you after installing the APK.
I'm experiencing an error in the history stack of applications upon first install. I made a test app to demonstrate this.
The test app is simply two activities, A and B. Activity A launches B. That's all it does. Rest is wizard generated template code from eclipse.
When the user installs the app (via web url apk), and runs it for the first time, I get an out-of-order activity stack:
-User starts the app, A is on top.
-They make A launch B by clicking a button. B is on top of the stack.
-User hits the home screen button.
-User returns to the app, A is displayed, instead of B.
-User hits the back key, B is shown!
-User hits the back key again, A is shown!
-User hits the back key again, home screen shown.
-Now the stack is clean, and app behaves "normally" from now on!
Is any one else seeing this? This is almost exactly like this known bug, however my users are not installing from eclipse:
http://code.google.com/p/android/issues/detail?id=2373&q=first%20%20i...
I can provide the test app/source if anyone wants to try. This is the manifest, which does not have any special customizations made to it. code...
as far as I know, this should definitely not be happening, and works fine after you clear the history stack the first time.
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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 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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Dec 14, 2009
My app shows a signup activity the first time the user runs the app, looks like:
ActivitySplashScreen (welcome to game, sign up for an account?)
ActivitySplashScreenSignUp (great, fill in this info)
ActivityGameMain (main game screen)
so the activities launch each other in exactly that order, when the user clicks through a button on each screen.
When the user goes from activity #2 to #3, is it possible to wipe #1 and #2 off the history stack completely? I'd like it so that if the user is at #3, and hits the back button, they just go to the homescreen, instead of back to the splash screen.
I think I can accomplish this with tasks (ie. start a new task on #3) but wanted to see if there was simpler method.
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Nov 16, 2009
I'm trying to figure out if there's any way to see if there is anything on the history stack so I can programatically display a Back button or not.
I tried getting the RunningTaskInfo to get the num of activities but it doesn't seem to work quite right for what I need. Does anyone know of another way?
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Oct 27, 2010
1. User click one button on Activity#1 to start Activity#2.
2. One button on Activity#2 start system default browser(Intent.ACTION_VIEW) to get Twitter authorized.
3. After user allow, Twitter redirect user to Activity#2(Custom intent- filter+data) and it save the tokens.
Now, if I press back key, the app back to browser, how to prevent this and return to Activity#1? Try several Intent.Flag before start browser with no luck.
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Jan 11, 2010
I have a start activity page for my game (which is the root activity for my app) that just lists "Play", "Help", and "About" TextViews on the screen. Each TextView has a click listener which start the appropriate Activity for each. The GameActivity (started with explicit intent from clicking "Play") has onSaveInstanceState implemented to save state of the game. Its onCreate checks for non- null Bundle to restore this state. My problem is this:
1. Turn on Phone/Emulator 2. start my game with icon in launcher 3. Start page is displayed 4. click "Play" to start my GameActivity 5. play game for a few seconds 6. click home 7. state is saved (proven with debugger calling onSaveInstanceState) 8. start my game with the icon in launcher 9. start page is displayed
I was under the impression that by clicking the app icon from the launcher that my existing task activity stack would be restored with my GameActivity being on top and its onCreate being called for me to restore the state I saved. Instead I am getting a brand new instance of my start page. Also, if I long press home and choose my running game icon, then my game comes back exactly as I left it. However, this apparently is NOT using my onCreate restore state logic as onCreate is never called.
All of the documentation seems to say that the entire stack of activities will be restored when clicking the application icon from the launcher, but I just get a fresh instance. What might I be doing wrong?
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Jun 9, 2010
All activities in my application require a user to be logged-in to view. Users can log out from almost any activity. This is a requirement of the application. At any point if the user logs-out, I want to send the user to the Login Activity. At this point I want this activity to be at the bottom of the history stack so that pressing the "back" button returns the user to Android's home screen.
I've seen this question asked a few different places, all answered with similar answers (that I outline here), but I want to pose it here to collect feedback. I've tried opening the Login activity by setting its Intent flags to FLAG_ACTIVITY_CLEAR_TOP which seems to do as is outlined in the documentation, but does not achieve my goal of placing the Login activity at the bottom of the history stack, and preventing the user from navigating back to previously-seen logged-in activities. I also tried using android: launchMode ="singleTop" for the Login activity in the manifest, but this does not accomplish my goal either (and seems to have no effect anyway). I believe I need to either clear the history stack, or finish all previously- opened activities. One option is to have each activity's onCreate check logged-in status, and finish() if not logged-in. I do not like this option, as the back button will still be available for use, navigating back as activities close themselves. The next option is to maintain a LinkedList of references to all open activities that is statically accessible from everywhere (perhaps using weak references). On logout I will access this list and iterate over all previously-opened activities, invoking finish() on each one. I'll probably begin implementing this method soon.
I'd rather use some Intent flag trickery to accomplish this, however. I'd be beyond happy to find that I can fulfill my application's requirements without having to use either of the two methods that I've outlined above. Is there a way to accomplish this by using Intent or manifest settings, or is my second option, maintaining a LinkedList of opened activities the best option? Or is there another option that I'm completely overlooking?
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Aug 13, 2010
Is it possible to start an activity on the stack, clearing the entire history before it? The situation I have an activity stack that either goes A->B->C or B->C (screen A selects the users token, but many users only have a single token). In screen C the user may take an action which makes screen B invalid, so the application wants to take them to screen A, regardless of whether it is already in the stack. Screen A should then be the only item on the stack in my application. Notes There are many other similar questions, but I haven't found anything that answers this exact question. I tried calling getParent().finish() - this always results in a null pointer exception. FLAG_ACTIVITY_CLEAR_TOP only works if the activity is already on the stack.
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Dec 4, 2009
I just experienced this behavior on four different phones, 1.5 to 2.0.
I made a brand new app. It's simply two activities, A and B. Activity A launches B. That's all it does. Rest is wizard generated template code.
When the user installs the app (via web url apk), and runs it for the *first* time, I get an out-of-order activity stack:
-User starts the app, A is on top. -They make A launch B by clicking a button. B is on top of the stack. -User hits the home screen button. -User returns to the app, A is displayed, instead of B. -User hits the back key, B is shown! -User hits the back key again, A is shown! -User hits the back key again, home screen shown. -Now the stack is clean, and app behaves "normally" from now on!
Is any one else seeing this? This is almost exactly like this known bug, however my users are not installing from eclipse: http://code.google.com/p/android/issues/detail?id=2373&q=first%20%20i...
I can provide the test app/source if anyone wants to try.
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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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Aug 12, 2010
I'm working on an app that launches the browser activity to perform a Twitter OAuth authorization. This process uses a callback url which will re-launch the activity that started the browser activity in the first place.My problem is that the browser pages remain in the history stack and when the user then clicks back from the preferences activity that launched the browser in the first place, they don't go back to the app's main activity, but instead are brought back to the browser. I've tried adding flags to the launching intent to prevent history and reset on clear, but it doesn't seem to work when running on my phone, only on the emulators.
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Apr 22, 2010
I have a huge maze of activities in my application. What I need to do, is that when the user logs in into the system, the activity history should be cleared. I cant just use finish() when I start a new activity, because I want the activities to have a history until the user logs in. I have experimentet with the different flags when starting an activity, but I have had no success.
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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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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 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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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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