Android :: How To Clear Android Stack Of Activities?
Nov 16, 2010
Hi I have an application with several Activities in Android and I want the user to be able to log out by pressing a menu button. The problem I have is that A) Android doesn't let you terminate the applications and B) even when I send the user to the Login Activity again they can always press back and get right back to the previous activity they were in.I already tried to launch the Activity with the two following flags:
Intent intent = new Intent(this, LoginActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
I also tried with each one of them by themselves. I also tried calling finish() after startActivity(intent) as I read in another StackOverflow
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Jul 8, 2010
I am having trouble popping all activities off the stack using ntent.FLAG_ACTIVITY_CLEAR_TOP and android:launchMode="singleInstance". In my application activity A, launches activity B (via startActivity) which in turn launches activity C (via startActivity). On activity C the user presses a menu item to return to activity A. When they arrive at activity A, I want only A on the stack such that if they click the back button they return to the home screen (desktop). This is the code that I am currently using when the user presses a button to return to A: Intent i = new Intent(this, A.class); i.addFlags(Intent.FLAG_ ACTIVITY_ CLEAR_TOP); startActivity(i); All activities are defined as android:launchMode ="single Instance" in the project manifest. My code doesn't seem to work though. Once I'm back on activity A if I click the back button I return to activity C. Am I misunderstanding how to use Intent.FLAG_ACTIVITY_CLEAR_TOP?
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Jul 26, 2010
Support App starts activity A, then A starts activity B and finishes itself. After that activity B starts activity C. Now the stack contains B and C, with C at the top. Then I click a button in activity C, and want it to clear B and C and start activity A, i.e. I want activity A to be the only activity in the stack. How can I make it?Edit: I made a test to use FLAG_ACTIVITY_CLEAR_TOP. But it didn't work in my case, because activity A is not running when button in activity C is clicked.
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Sep 3, 2010
My App is Launched by "Main.java" (Activity) and opens a Notification and a second Activity called "Sub.java", now I press the Home-Button and the App disappears (everything okay until here). If I'll now click on the Notification the "Main.java"-Activity is launched, the "Sub.java" seems to be lost. Is there any possibility to reorder the Stack of Activities to the front?
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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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Aug 23, 2010
I need to keep track of currently existed Activities in Activity stack.
Can any one help me in that how to do it programmatically?
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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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Aug 4, 2010
I have activity A that starts activity B which starts activity C
A -> B -> C
When a user clicks on a button in activity C, i want to bring A to the top of the stack and take B & C completely out of the stack. Is there a way to do this ? ?
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Jun 26, 2010
I'm currently debugging my app which is quite complex and has up to 5 activity levels. In order to detect memory leaks (i.e. activities that aren't removed from memory even finish() is called, due to some references held somewhere) I want to check which activities are still alive in memory. Currently I create hprof dumps, but it's not very convenient, cause every time I need to mount the sdcard, copy the hprof dump file from the sdcard to my PC, etc. (Side note: I already tried to automate the pulling of my hprof file more easily, but I'm on an unrooted device and adb pull <hprof file> won't let me / no permission.) Therefore I am wondering, if all I want to know is IF and WHICH activities are still currently alive in my memory, is there a way through the Android API or any other way on-the-fly with which I can achieve this (list all alive activities of my app), programatically.
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Jul 23, 2010
The official documentation describes tasks as follows: All the activities in a task move together as a unit. The entire task (the entire activity stack) can be brought to the foreground or sent to the background. Suppose, for instance, that the current task has four activities in its stack three under the current activity. The user presses the HOME key, goes to the application launcher, and selects a new application (actually, a new task). The current task goes into the background and the root activity for the new task is displayed. Then, after a short period, the user goes back to the home screen and again selects the previous application (the previous task). That task, with all four activities in the stack, comes forward. Is there a way to programmatically detect when the task of the current Activity moves into and out of the background? I would like to know when the user has switched switched to another application, vs. when the user navigated to another Activity in the current app.
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Jan 25, 2010
I have an application with 2 activities, LogonAct and MainAct. LogonAct is a logon activity which I want to force the user to go through each time they return to the application. I've set android:clearTaskOnLaunch="true" on LogonAct.
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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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Nov 17, 2009
I have 3 Activities that my user continuously is looping through. When user is back to the main screen I need to terminate previous history so user cannot hit back button and end up on screen #2, what would be a good way to do something like that? To reiterate - say I don't know or predict the path which leads me to the original view. But once I load it I want to clear history that led user to that view. In 2.0 it's possible with overwriting Activity#onBackPressed but I need something like that in 1.6
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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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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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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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Jun 30, 2010
how to call BarCodeScanner, and return the value to a field.so now, i have a toast that says "successful scan" and then i want to pass the result to a new activity. when i comment out my intent, everything works (minus the passing of data/switching of screen, obviously) but when i run my project as is, it FC's no errors reported by eclipse in code or xml. any insights?
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Jun 24, 2010
What exactly does HTC Sense Clear Data actually clear? That may be a solution to reverting back to 5 homescreen pages instead of 7 without having to do a factory reset. Just curious as to what I am going to mess up? Will i just have to personalize the homescreen again, put widgets up, reconnect to fb, twitter, myfaves, etc. It's not going remove any 3rd party apps, just make me create new widgets, etc..?
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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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Dec 21, 2009
can any one tell me what is d actual diff in Stack based and Register based JVM?
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Oct 12, 2010
How can i implement SIP protocol in android.I want to make video conferencing application using SIP protocol.So is it feasible using SIP protocol and how to start.
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Dec 1, 2009
Hello all, I am new in android developer and I would like to make a sip based application for this platform. In the signaling part I have found about jain-sip (used it) and sipdroid( any good tutorial? ) the problem starts when I want to stream data from a phone to a server. So the question is: Is there any stack for RTP? does the new SDK support this? I have found this: http://www.hsc.com/tabid/87/ItemId/20/Default.aspx have anyone used this stack? also I found this video on youtube :http://www.youtube.com/watch?v=g1NHEsXFEns which demonstrates the use of rtp to stream video/audio is this fake does any one know how? also I have read somewhere on the net that sipdroid has support for rtp is this correct? thanks in advanced and sorry for the long list of questions regards maxsap
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Apr 13, 2010
After Bluetooth connection is lost. Bluetooth stack on HTC Legend is messed up. Nothing works till Bluetooth is turned off and on. Here is the sample, the problem is blocking read on the thread but InputStream.available call always returns 0 and cannot be used to implement some ugly, busy-waiting workaround. package com.example.android.disconnectproblem; import java.io.IOException; import java.io.InputStream; import java.io.InvalidObjectException; import java.io.OutputStream; import java.util.UUID; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView;
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Mar 23, 2009
Is there a way to tell when my task gets put on the back of the UI stack (user pressed "home" say?) I have some resources I'd like to free when not foregrounded. The lifecycle routines seem dicey to use to try and infer this. The "home" key does not seem to be passed to onKeyDown(), and moveTaskToBack() is never called by the system so I can hook it. I can poll the ActivityManager for running activities with my task id, but hard to find a good time to call this.
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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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