Android :: Service Gets Killed - Due To Activity?
Jun 10, 2010
I have a service running in the background. It starts on device boot. Also, I have one activity (that appears in the task launcher) in which I have provided buttons to start and stop the service.
Now, I install the application on the phone and I start the service using this activity (and not on-device boot). As expected the service starts and starts doing its designated task. I no-longer need the activity. So it goes out of sight and may not be required for a long time now.
My question is, now, if the android platform kills this activity, will it kill my service too ? (This is because I see that after few hours, my service is not running anymore.). If this is true, then will the service continue running longer if the service was started on device boot.
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Aug 2, 2010
Whenever the memory needs to be reclaimed, the process is being killed by Activity Manager Service in killPidsForProcess. I have a back button in my activity window on right corner of the title bar.
I want to kill the activity completely on clicking the close button. Can I reuse the same function and will it have any major effect? Please help me out in this.
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Aug 29, 2010
I just want to know how detect that the activity or service has been killed by the advanced task killer? I was expecting the onDestroy method to be called, but it doesnt!
My app starts the background service on boot. The activity is not started except from menu. But its name appears in the advanced task killer list. When I try to kill it, it doesnt call the onDestroy method neither the service's.
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Oct 4, 2010
Is there a way to notify an activity/service of a force-close request right before it gets killed?
I mean when the user hits the force close button in Menu>Settings>Applications>Manage applications>app name>Force Close.
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Jun 29, 2010
I have a service in my app the creates an alarm and runs a check ever X minutes. I am new to android and I was wondering is there a way to prevent another app such as ATK (advanced task killer) from kill my service/alarms? It seems that if I normally close the app my alarms still work but when I go to ATK and stop the app the service dies as well. Maybe thats the point, but this service is rather important and most users would want it to run even if the app itself is no longer running. I assume that if the system kills it for whatever reason then their is nothing you can do about it. Could someone please inform me on this issue and a possible solution to do what I need?
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Jul 25, 2009
I have a service that needs to hold a persistent TCP connection, think IM. I'm reluctant to use setForeground() - the service being down temporarily isn't that big a deal, and I am assume I can trust that I'll be run again once memory is available, correct? The problem here is this. The service was started via startService() before being killed. However, when it is restarted, only onCreate() is executed. This makes it hard to continue, because starting work onCreate() means I can't even bind to the service (to say query it's status) without it doing so. Is this a bug or per design? What is the status of the service after it is being restarted? Is it consider "started" by the system, i.e. waiting for a call to stopService()?
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May 7, 2010
It is very important that my service stay running until someone with a password stops the service from my UI screen. My app runs great but it is designed to be turned on/off by parents (with a password) on their kids phones. I have managed to make everything work but the problem I'm having is that if the kid uses a task manager to kill my service then my app is useless. I would be grateful to anyone who knows a way to either
1) monitor the service and start it back up automatically if its "killed"
or
2) prevent someone from being able to kill it except from the activity (administration screen) that launched the service. Or both?
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Aug 25, 2009
I have a service that polls for data. To indicate this to the user I have a persistent notification in the statusbar. In some cases when the device goes low on memory it destroys the service but OnDestroy is not called. Later when there is available memory OnCreate is called. Is this normal behavior? I had hoped that OnDestroy would be called to I could remove the notification in the statusbar. Now the user thinks that the service is still running, while it has been stopped by the OS.
In order to restart the polling how do I know that the OnCreate is really a restart event and not first time creation of the service? I thought about checking for the presence of the notification in the statusbar, but I couldn't find a API to check if a notification was showing or not. I have not tried "SetForeground" on the service, since the service isn't that important to the user, but maybe that would minimize the problem.
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Sep 5, 2010
I have an app widget that uses a Service to handle updates (as per the SDK sample). If a task killer kills the service, the widget obviously stops updating. Is there any way I can notify the widget that the service has been killed so it can attempt to restart it?
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Nov 10, 2010
I have an Android service that's responsible for firing notifications at certain points in time. I use an android.OS.CountdownTimer for this. An activity creates and starts the service. If the phone is locked, notifications that are within let's say 1min are shown. Notifications that are much later are never shown. The service is unbound from the activity when the activity is onpause.
As long as the phone doesn't lock the notifications are generated, even if the activity is stopped and unbound from the service.
It seems to me that the service is stopped/killed. When I make the application debuggable and debug it on target, it works fine, also when the activity is stopped and the service is unbound.
The app is developed for v1.5 and runs at Galaxy S with 2.2.
Service is started as shown below
CODE:.................
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Apr 5, 2010
I am working on a MVC implementation for Android (to be subsequently hosted on SF and/or GC).
It works like this:
Activity (View) <=> Application (Controller) <=> Data (Model) <=> Persistence (DB/Network etc)
The scenario is:
1. Activity launch (main/launcher)
2. Notifies Application about performing a data transaction
3. Upon receipt of data response, controller devices which Activity to launch (or update existing)
4. Application has overridden the method onConfigurationChange
Problem: When the orientation is changed, the Application is notified about onConfigurationChange but:
a) The "current" activity is Destroyed and recreated -- which is fine to some extent b) The new instance which is created is automatically => onCreate, onPause, onStop, onDestroy.... now that's catastrophic.
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Nov 5, 2010
I created a thread in my activity, and that thread will print out the value of my instance variables in my activity after running for about 10 seconds. I pressed the back key to destroy my activity before the thread prints out the values, and when the thread reaches that line of code, it can still print out the values correctly. That means even though the activity is finished, the java object of the activity is still there. Will the object always be there? Or it is just waiting to be GCed? Or it will be killed only when Android needs memory?
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Aug 10, 2010
Recently, I installed FRG01B. I had no problems with it except for the fact that I couldn't get the phone to mute.
I noticed that there was a really cool version of FRG22 out by Liquid Frozen Yogurt 1.3 (FRG22).
I downloaded RSD Lite, SPRecovery_ESE81.sbf, and I downloaded the 64 bit drivers for the Droid. I am using Windows 7 Ultimate Edition 64bit. I got the files from this page: FRG01B.SBF for Droid courtesy of RootzWiki - Droid Releases - AllDroid Public Board - FRG01B.SBF for Droid courtesy of RootzWiki - Droid Releases - AllDroid Public Board - AllDroid.org > Home
Anyway, I installed RSD Lite and the drivers. I opened RSD Lite and opened the SPRecovery_ESE81.sbf file. I clicked show device, but nothing was showing up in the window, but below it said connected. I clicked START. After my phone rebooted, it's shot. No service, no battery life, and it keeps rebooting itself. What can I do! Someone please help! My Gmail address is chim777@gmail.com and I will be available for chat as well. I will keep checking this thread every few minutes. Someone please help as I have no clue what the hell I did. All I wanted to do was root my phone.
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Sep 23, 2010
like many others, I want to kill my Android application on "exit" button. Really kill, not just move to background and stop all active code. (I know very well that Android does not like it.) I found Process.killProcess(Process.myPid()); and System.exit(0) which both work fine (I have no problem with activity stack, the "exit" button is in my base Activity.). But there is a problem. When I kill my process and I am back in the shell, I press [Home] button. It shows list of applications that are on the background including my application which has been killed.
Is there a way how to do both: 1) kill the process and 2) remove it from the Android application list that is shown after user presses [Home] button? Thanks for all replays (with the exception of that stupid "you should not exit applications explicitly on Android"
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Sep 10, 2010
I am trying to write an app that cannot be killed by a user or another application. I understand this goes against what Android has designed for its platform, this is more of a proof of concept. The plan is two have two apps, app1 and app2. When app1 starts it will start app2 and then bind onto app2, when app2 starts it will make sure app1 is started if not, then start it and bind onto app1. The point of app1 binding on app2 and app2 binding on app1 is so when one of them gets killed a method will be called that the binding has been disconnected and the app can then be restarted. I currently have the apps starting each other when they start up but I cannot seem to get them to restart when I force close one of them.
For App1 service I have and app2 very similar:
CODE:..............
And for my class that implements ServiceConnection I have:
CODE:............
I think the issue I am having is that onServiceDisconnected never gets called when app1 or app2 is killed. I think this may be because I am not correctly binding to a service.
W/JavaBinder( 884): ibinderForJavaObject: 0x436274a0 is not a Binder object
W/JavaBinder( 891): ibinderForJavaObject: 0x43621d30 is not a Binder object
How can I bind services together so when one gets force closed that I will get a notice on the other?
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Jul 28, 2010
I had a prob with app i.e when i am moving to the previous window the control goes to the splash screen of my app because the previous activity is killed by android runtime. how to make the previous activity alive. or how to create activity again and how to access it from present activity.
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Sep 10, 2010
I need to made an activity (without layout) that on start check if a service is running. if it is true it starts Activity2, if it false it starts Activity1.
I tried with this code:
CODE:............
Enter code here
But when I check, in the onCreate method, if serviceConnect!=null I receive sometime a NullPointerExcption.
I tried also to insert the operation in the method onCreate in an Async Task:
CODE:............
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Feb 17, 2010
Suppose I have an Activity that's a list. It calls a Service when this Activity starts.The Service will do background stuff download, parse, and fill the list.My question is this: How can the Service communicate with the Activity?How can I call a method in the Activity, from the Service? (I'm new to OOP)
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Jun 12, 2010
In Virgil Dobjanschi's talk, "Developing Android REST client applications" (link here), he said a few things that took me by surprise. Including:
Don't run http queries in threads spawned by your activities. Instead, communicate with a service to do them, and store the information in a ContentProvider.
Use a ContentObserver to be notified of changes.
Always perform long running tasks in a Service, never in your Activity.
Stop your Service when you're done with it.
I understand that he was talking about a REST API, but I'm trying to make it fit with some other ideas I've had for apps. One of APIs I've been using uses long-polling for their chat interface. There is a loop http queries, most of which will time out. This means that, as long as the app hasn't been killed by the OS, or the user hasn't specifically turned off the chat feature, I'll never be done with the Service, and it will stay open forever. This seems less than optimal.
Long question short:
For a chat application that uses long polling to simulate push and immediate response, is it still best practice to use a Service to perform the HTTP queries, and store the information in a ContentProvider?
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Jan 13, 2010
Our application will expose a Service that can be called by Activities in other people's applications.In many cases, the parent applications calling Activity may be paused before our Service completes. I am looking for the best way for a Service to communicate back to the calling Activity that may have been paused.These are the known options:
(1) Require calling Activities to have a registerReceiver() with a custom action and broadcast to that from our Service. The only way to secure this registerReceiver() is with a signature-based permission.As our Service communicates with any number of unknown 3rd party apps,we can't sign our Service's parent app with all these unknown certificates. These apps would therefore be exposing an unsecured registerReceiver() on their Activity. Would ideally like to avoid requiring this.
(2) Create a PendingIntent to send results back to the activity and give it to our Service. Our Service would send data to calling Activity's onActivityResult(). Each time the result is delivered, the calling Activity will go through onPause() and onResume() but this should be OK.
(3) The calling Activities could create a Handler. The Activity would then create a Messenger pointing to that Handler and send it to our service. Our Service can then use the Messenger to deliver our message back to the calling Activity.
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Sep 3, 2010
I have a launcher activity which gets activated everytime i start the application and a service which complements it. Now as i press the return key from my main activity .Its Ondestroy gets called.Now i have nullify the pointer of the my launcher activity there. now i am listening through the service any event happening on the network after closing the launcher activity thread and if any event occurs i have to relaunch my launcher activity. i have tried intent but doesnot seems to get though it .
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Oct 6, 2010
I have a service (input method) and from within that service I want to start and activity which was declared in the same manifest. The activity maybe running but in the background.
How do i check its presence and bring it to front, or optionally start this.
From what I can gather from other posts, this is about what I need to do:
CODE:..............
I don't knwo which of thest flags pertain to what I need to do. The docs are quite merky, and my random attempt at making this work failed.
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Oct 16, 2009
My application has a background process which continuously waits on a socket for receiving messages and it should be started only once and at the time of application starting.Thus i want to do that background job in a service.
The service should not be started from the activity ,it should be started at the application starting.
How can i define the service,which will be started at the time of application starting?
If at all the service is started from activity.The activity can be destroyed and restarted.when this happens the service also be restarted .
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Jun 14, 2010
How can I start a service from an Activity ?
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Feb 25, 2010
In my app i have an activity from which i want to start an Service.
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Aug 11, 2010
Is it possible to start an Activity from a Service? If yes, how can we achieve this?
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Nov 19, 2010
i am writing an app in which i need a background service to call an activity and show some result.
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Dec 16, 2009
I am working on an android application, where the activity binds to a local service to perform certain tasks.Now I am binding the service in the OnCreate method of the Activity, after which the activity has to use the service object to invoke the functionality defined in the servicein the OnStart method. The problem here is that once a call "bindservice" has been made, we might not get the serviceobject immediately, so my service object would be null till that time. So i cannot invoke the service functions.So is there a way to determine in the activity that the service has been bound and the service object is valid and could be used now. For reference i'm attaching a code snippet for the same.
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Mar 13, 2010
Can an Activity be bound to two different Services at the same time or do I have to unbind one Service before binding to the other one?
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May 6, 2010
I want to stop an Activity that is in some other application from my Applications service. Is there any mechanism to do so?
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