Android :: Prevent New Activity Instance After Clicking On Notification
Jun 24, 2010
Application (non-wanted) behavior - application is started, some text is put into text-box and notification is created through button action. user "clicks" the home button, application is "minimized", notification is available in bar user selects the notification and the application is "maximized"
BUT - instead of the original instance, new instance is started (e.g. in the newest instance is missing the original text; when the latest instance is closed there is still the original instance with original text ) .
The code of the notification method
CODE:.....
I have also in the manifest xml file following tag android:launchMode="singleTask"
But it is still the same...The main problem is double/triple initialization of the application, i know that there are other means to preserve the values in resumed applications. Also it is needed that the applications stays running in background as the main functionality is the streaming of internet radio.
What is missing in the code ? What kind of information from my side is missing for to troubleshoot the issue ?
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Nov 5, 2010
I have a widget that contains 4 buttons to show 4 stock prices, each of them will launch into the same activity Quote.class to show stock details. In onUpdate(), it will set up the pendingIntent with extras with stock symbol. After I hit button A, it goes to Quote activity that shows stock A. Then I hit the BACK button to the homescreen, Quote activity calls onDestroy() and when I hit button B, stock B will show properly. However, when i hit HOME button after it shows stock A, the Quote activity only calls onStop without calling onDestroy(), then as i hit button B, it will call onStart() and it shows the same instance that shows stock A.
CODE:............
Originally I thought adding a flag in the Intent should solve this problem. But I have tried
i.setFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK or FLAG_ACTIVITY_NEW_TASK or FLAG_ACTIVITY_NO_HISTORY), none of them makes any difference.
So is there any ways to make it work? How can i remove the history stack from HOME button? How can I call onCreate in Quote activity and get new extras when i hit button B?
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Mar 25, 2010
I have created an activity which sends a number of notifications to status bar. Each notification contains an intent with a bundle.
Here is the code:
CODE:..............
When user clicks this notifications, I read the bundle string "action" and performs that action. Here is the code:
CODE:.................
Everything works as expected. But, when I minimize the app using "arrow" button on device and then press and hold home button and clicks on my app icon the application starts and performs the same last action which have been performed by clicking the last notification. I figured out that when we click the app icon the application starts with last intent triggered by the notification.
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Jun 4, 2009
I am learning the app widget programming in the 1.5 SDK release. I was playing with the sample widget (wiktionary) and found out that you can actually add multiple instance of the same widget to the home screen, is there a way to prevent this? An attribute in the XML? I am stuck with 3 instance of wikitonary and 2 instances of music player on my emulator now... can't get rid of them... :(Also I am looking into buliding my own app widget container, not a home screen replacement, just a container that can host other widgets, I read the appwidgethost api doc, is there any sample code or guide on how to use the appwidgethost api
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Feb 25, 2010
If I have a checkable item in a Context Menu or ordianry Menu, how do I prevent the menu from closing when the item is selected?
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Feb 5, 2009
I have an application with main view having a search button. On clicking the search button, search results are displayed in a text view. When I hit the back button at this view, instead of navigating to the previous screen, application itself gets closed. Could anybody please let me know how to go back to previous screen.
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Jul 9, 2010
I have a Contact Activity which is derived from ListActivity, which displays list of contacts, and on click of item, a new Activity Message Activity derived from ListActivity is initialized.Now I know, I can pack some information in Bundle and pass it before creating activity, but is there a way I can get instance of "ContactActivity" in onCreate method of "MessageActivity"?
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Apr 3, 2010
I'm having difficulties handling multiple instances of my root (main) activity for my application. My app in question has an intent filter in place to launch my application when opening an email attatchment from the "Email" app. My problem is if I launch my application first through the the android applications screen and then launch my application via opening the Email attachment it creates two instances of my root activity. steps: Launch root activity A, press home Open email attachment, intent filter triggers launches root activity A Is it possible when opening the Email attachment that when the OS tries to launch my application it detects there is already an instance of it running and use that or remove/clear that instance?
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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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Jul 9, 2010
Is there a way to get an instance of the activity that has called the currently running activity from the intent object that has been passed to it? eg. if A has called B, I would like to retrieve A's instance from the intent in B's onCreate method. As Activity is not Serializable i am not able to pass the instance in the extras bundle.
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May 9, 2010
I have a bunch of tab activities (which I implemented myself, didn't want to use the tabviews with activities inside them), so It's basically 5 activities calling each other every time the user clicks on the tabs displayed as a row of LinearLayouts at the bottom of the screen.
The thing is that the way I do it now, everytime the user jumps from one activity to another, a new activity is created and launched. Of course, I can see I'm wasting resources this way. So what I would like to do is to create every activity only once; and then if the user wants to go back to the previous (or any one that was already created and is probably paused) just check on some kind of list or array to see if the activity can be recovered and only in the case it can't; to lauch a new one.
My question is, how can I check this? should I save the intents? and how to recover the activities afterwards? I'm kind of new with java.
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Jul 19, 2010
Is there any way to get the instance of a launched activity(or any view in that activity )of a application in another application.
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Aug 16, 2010
We all know that hitting the back button on the device doesn't kill the application, it merely finishes (destroys) the activity running on the foreground.
Well I have come across some code which helps me capture the back button signal so that I cannot exit the application. The only way to exit it in such cases is to press the home key.
Now this situation presents me with a unique disadvantage! The inability to kill finish the application on a time of my own choosing allows the application to keep running in the background like nothing has changed.
So in such cases is the task manager my only friend or is there a way for me to otherwise kill this application?
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Sep 2, 2010
Is it possible to create/push-onto-stack a new Activity of the same main Activity in an Android application with an argument passed to the Activities constructor? Specifically from a Dialog object...
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May 21, 2010
My app consists of an Activity and a service that runs in the background. The service periodically checks a website for an alarm condition. When the service detects the alarm, it should put a user notification into the status bar. If the user clicks the notification, it should display the app's activity. If the activity is already running, that activity should become visible. If the activity is not currently running, it should be created.
However the notification created by my service *always* creates a new instance of the activity, whether the activity is currently running or not. How do I get the desirable behavior?
Here is my service pseudo-code:
CODE:...............
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May 28, 2009
I'm working to finish a small application, but I'm having problems seeing what combination of activity attributes and intent flags I need to achieve my intended application design. Trying my best not to describe the app in minute detail, here's the basic operation (I've supplied screenshots in the hope it makes sense easily): Users have a garden which contains flowers (GardenActivity).
http://www.tomgibara.com/images/daisy/garden/hut_screen.jpg
They can tap on a garden to see details of flowers (FlowerActivity)
http://www.tomgibara.com/images/daisy/garden/flower_screen.jpg
When flowers are fully grown a notification provided, tapping on the notification displays the garden containing the flower.
http://www.tomgibara.com/images/daisy/garden/notify_screen.jpg
Users can also use the GardenActivity as a picker to choose flowers to "exhibit" (ConfigureActivity)
http://www.tomgibara.com/images/daisy/garden/planting_screen.jpg
I want the app to operate so that if the user already has a GardenActivity somewhere in the stack (whether it's at the top, or underneath a FlowerActivity) the notification will alert the user by bringing that activity to the front (clearing any FlowerActivity that may be above it). I've tried using the FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TOP combination (without changing any activity launch modes) on the notification's pending intent, but it still launches a new GardenActivity, even if one is already available.
I've also tried using android:launchMode="singleTask" on GardenActivity. The notifications then seem to work correctly, but it prevents GardenActivity from returning any result back to ConfigureActivity.
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Oct 31, 2010
I'm writing a bitmap editor and I'm trying to write an autosave feature. When onPause is called, I write the application state to an autosave file. As this takes between 0.1s and 1.5s, I've been advised this IO operation be performed in a background thread.
In the onCreate method of my activity, I check to see if the autosave file exists and, if it does, I open it.
Are there any scenarios I have to consider where the user can somehow leave the activity, the autosave thread starts and the user can return to the activity before the thread has finished? If so, how can I detect this and wait for the thread to finish before I check the state of the autosave file?
I was going to make it that, when the user backs out of my activity, they're asked to wait a second while the data is saved. This seems OK, but I can't do this when my activity is interrupted by something like a phone call.
Also, I'm a bit confused about how multiple versions of the same activity can be started as this makes dealing with autosaving more complex. Is there a way to make sure only one instance of my activity is allowed to run at a time?
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Apr 27, 2010
I've got an android app that pulls a random 20 questions (rows) as a cursor from a SQLite DB and loops through all the questions to ask the user all 20 questions.
Is there some way to save the cursor's state/location when the activity is paused or stopped so that when the activity resumes the cursor is restored and in the same position as it was when the activity was paused/stopped?
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Oct 4, 2009
Before asking my doubt, let me clarify my understanding of allowTaskReparenting...
Suppose there exists a Task (say Task 1) and this task has an activity (say Activity 1) which wants to call my Activity (say Activity 2). Let my activity (activity 2) set the attribute allowTaskReparenting to true and let my activity have a specific taskAffinity(affinity1). When Activity1 calls my activity (activity2), my activity becomes part of the task1. But suppose another task (task2) is already present/created with the same taskAffinity as mine (affinity1) and an activity in that task (say activity3) tries to start my activity, my activity gets re- parented to task2.
Not sure if i was clear enough. If i were to rephrase my words...
If my activity has allowTaskReparenting set to true and an instance of my activity is already present in task1. If task2 with the same task affinity as my activity tries to start my activity, the EXISTING activity gets re-parented from task1 to task2.
My quesions:
(1) Is my understanding correct ?
(2) If I am correct then a single instance of my activity gets shifted from task1 to task2. So 2 activity objects of my activity are NOT created.
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Feb 6, 2010
I'm using an intent-filter on URLs for my activity:
CODE:...............
the launchMode attribute is set to "singleTop", but it looks like a new activity is created every time I click a matching url. I thought that if the activity is already alive somewhere, it would simply be brought to the front of my activity stack?
I tried this on the emulator/device, same behavior, a new activity instance is always created.
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Sep 7, 2010
I have two activities. A and B. A starts B. Both are running in the screen and both are visible. Say now B is visible.
On a special key press, I want to bring the A to the front and make it active. The problem I am facing is when the special key is pressed, another instance of A is launched and the new instance is brought to the front.
But I want the original A to come to the front. I want to make this change in the framework layer rather than application specific by using the singleInstance theme in the launchMode in AndroidManifest file.
Please help me in this regard as this is really urgent for me. Any inputs will be really valuable for me.
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Apr 23, 2010
I have attached a menu to my TabActivity, and when a menu item is selected, I would like to do something different based on which view is being currently displayed in the TabHost.
int getCurrentTab() returns me the id of the current tab... but from that int how can I get the instance of the activity running?
I also tried getCurrentView(), getCurrentTabView(), but these return things I can't seem to cast to the class of the current activity.
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Apr 20, 2010
I am using an Application object to store app-wide instance data--data that I need to remain in existence for the entire lifetime of the app, so the Application class seems like the proper place to put it. I have just finished reading this thread http://groups.google.com/group/android-developers/browse_thread/threa... that goes into pretty good detail and receives confirmation from Googler hackbod as to how the Application class performs--and from that info it seems this strange behavior I am receiving should not be happening...
Basically, every once in a while when I resume my app in any of its Activities (it is still running in memory so onCreate is not called) I get NullPointerExceptions because instance variables in my Application class are returning null when I request them from my Activity (via a getter method in my custom Application class). It seems as if sometimes Android saves the states of my Activities but deletes all my instance variable data... This can't be an Android problem--there must be something wrong with my code.
Has anyone else ever ran into an issue of this kind? Any ideas as to what may be causing this? I'm not going to post my code here as that won't help anyone, but hopefully someone can point me in some helpful directions.
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Oct 4, 2011
1) I dont want to re-create activity once it is created in order to show. How can I do this ? like showing activity from back stack whenver thers a call for it. (It might appear at any index in back stack.)
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Nov 17, 2010
I have been in problem of the Activity life-cycle. All though i read lots of docs on it put on getting clear picture on it. I have Activity A. In that activity I have menu options. If we click any option it opens the respective activity like if i click on 2nd button it opens Activity B Now again Activity B has same options into it. When user clicks on 1st button then i need to go back to activity A. So using this. Intent intent = new Intent().setClass(context, Articles.class); startActivity(intent); So always it starts new instance of activity and fetch data from DB. I want something like Activity A can be resumed back as it was.
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Jul 31, 2010
In my application I notify the user with notifications, if something special happens:
public void triggerNotification(String msg) {
notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Intent contentIntent = new Intent(this, ABC.class);
Notification notification = new Notification(R.drawable.icon, msg, System.currentTimeMillis());
notification.setLatestEventInfo(this, "ABC", msg, PendingIntent.getActivity(this.getBaseContext(), 0, contentIntent, PendingIntent.FLAG_CANCEL_CURRENT));
notification.flags = Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(notificationCounter, notification);
notificationCounter++;
}
If the user clicks on the Notification, the onCreate() method is called. But I want that a specific method in my app is called, or if the app is not in the foreground, that it is brought back to the foreground. I know there are lots of tutorials that explain how to handle notifications, but I just don't understand them completely and wasn't ever able to implement the things like I'd like to.
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May 28, 2010
I am switching activities on tab clicks and successful at this. But, in one of my Activity class I am doing the following:
CODE:.............
I want to change the background of this layout only and I want tabs to their as it is. But with the currentandroid:layout_height="fill_parent"in main.xml my background is overwriting the tabs which means I am unable to see tabs. and If I makeandroid:layout_height="wrap_content"` I cannot see any change taking and tabs are still their.
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May 28, 2010
I am switching activities on tab clicks and successful at this. But, in one of my Activity class I am doing the following:
CODE:........
main.xml has the following:
CODE:...........
I want to change the background of this layout only and I want tabs to their as it is. But with the currentandroid:layout_height="fill_parent"in main.xml my background is overwriting the tabs which means I am unable to see tabs. and If I makeandroid:layout_height="wrap_content"` I cannot see any change taking and tabs are still their.
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Dec 12, 2009
How to get custom dialog activity while clicking on listview in android?
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Nov 18, 2010
I am working on an application where I need to go to the next Screen form the Main Actvity when I Click on the Image Button of the Main Activity Screen. I had searched a bit on Net regarding this and found something like the OnClickListener method. I am still stuck for what exactly I want to do actually.
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