Is there a way to find out if an activity is bound to a service? Something like boolean isBoundToService(ServiceConnection sc)?
Sometimes when I play around with my app I get an exception when it tries to unbind a service which is not bound.
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so the application I've written has a service (that tracks GPS data) with a single main activity that binds to it with bindService in it's onStart() method, and unbinds from the service in it's onStop() method using unbindService( ServiceConnection ). I also have an activity which is an options screen, that is launched by pressing a button on the main activity. On this options screen, I have a checkbox that says "Run in background", which, if set to true, means that when the user exits the application with eier the Home or Back buttons, the service will continue running, not turning the GPS off. I do this by calling this.startForeground onUnbind, and this.stopForeground onRebind, if the setting is set to true, and stopping and starting my location reader onUnbind and onRebind respectively if the setting is false. If the service is running in the background, it also displays a notification to ensure the user understands that the GPS is still running and draining their power. This notification is displayed and stopped by relying on the startForeground and stopForeground methods......
View 1 Replies View RelatedI have a service that's running in the background, is there any way (short of keeping a count of onBind() and onUnbind()) to know the number of activities that are bound to it?
I am trying to provide a "quit" function. all my activities derive from the same base class. I am keeping a global static around that says the "quit" button was pressed. then on each of the activities onResume() method, I look for the global static "quit" variable and if it's set to true, I call "finish()" so my activity shuts down, and then next activity on the task stack appears -- which goes through the same process of checking the global static "quit" variable until it gets to the root activity -- which effectively goes back to the main desktop screen.
However, I need a way to reset the global static "quit" variable, otherwise, when I launch the app again, it will check the global static quit variable and shutdown immediately - never coming back up. So, I want to know if there are any activities bound to my service, if not, I would set the global static "quit" variable back to false so that the app could be relaunched again.
I have an Android Service that I would like to keep running even after the last Activity has been popped off the stack, or the User has chosen to do something else.
Essentially the Service is listening for changes on a remote server, and I would like to generate a Notification if and only if an Activity from the app isn't running(or visible). In other words, I don't want the Notifications to occur while the User is directly interacting with the app.
In the case where the User is directly interacting with the app, the Service will notify the Activity and update appropriate UI elements based on the changes. I plan to implement this through the Observer pattern.
How can the Service know if none of apps Activities are bound to it?
I'm working on my first Android app, so I apologize if this is extremely obvious. I've got three activities in my app, and the user switches back and forth pretty frequently. I've also got a remote service, which handles a telnet connection. The apps need to bind to this service in order to send/receive telnet messages.
I have re-written my code in light of your clarification on the difference between using bindService() as a stand-alone function or after startService(), and I now only get the leak error message intermittently when using the back button to cycle between activities.
My connection activity has the following onCreate() and onDestroy():
CODE:..........
So the service is started when the activity is started, and stopped when the activity is destroyed if no successful telnet connection was made (connectStatus == 0). The other activities bind to the service only if a successful connection was made (connectStatus == 1, saved to a shared preferences). Here is their onResume() and onDestroy():
CODE:.............
So the binding happens in onResume() so that it will pick up the changed state from the connection activity, and in the onDestroy() function it is unbound, if necessary.
But I still get the memory leak error message "Activity has leaked ServiceConnection @438030a8 that was originally bound here" intermittently when switching activities. What am I doing wrong?
Full error message follows (from the revised code):
CODE:..........
I did as you suggested and added an onUnBind() override to the service. onUnBind() is actually only triggered when all clients disconnect from the service, but when I hit the home button, it executed, then the error message popped up! This makes no sense to me, as all the clients have been unbound from the service, so how could the one destroyed leak a serviceConnection? Check it out:
CODE:..................
I thought it might be something like you said, where the binding to the service is not complete when unbindService() is called, however I tried calling a method on the service as I backed through each activity to verify that the binding is complete, and they all went through fine.
In general, this behavior doesn't seem related to how long I stay in each activity. Once the first activity leaks its serviceConnection, however, they all do as I back through them after that.
One other thing, if I turn on "Immediately destroy activities" in Dev Tools, it prevents this error.
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.
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:............
Can we make an application use custom virtual keyboard exclusively? So that no one else can use this virtual keyboard, and our app is always using our keyboard... ?
View 3 Replies View RelatedTrying to replicate the behavior of ItemizedOverlay.boundCenterBottom(), inside of one of my Overlay classes. I am fairly certain that I can do this using setBounds(), but I am utterly lost as to what setBounds() is actually doing.
View 1 Replies View RelatedSuppose 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)
View 2 Replies View RelatedIn 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?
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.
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 .
View 4 Replies View RelatedI 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.
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 .
How can I start a service from an Activity ?
View 4 Replies View RelatedIn my app i have an activity from which i want to start an Service.
View 3 Replies View RelatedIs it possible to start an Activity from a Service? If yes, how can we achieve this?
View 1 Replies View Relatedi am writing an app in which i need a background service to call an activity and show some result.
View 4 Replies View RelatedI 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.
View 2 Replies View RelatedCan 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?
View 2 Replies View RelatedI want to stop an Activity that is in some other application from my Applications service. Is there any mechanism to do so?
View 6 Replies View RelatedIs it possible to close/finish activities in activity stack from a backgorund service.
View 2 Replies View RelatedI 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.
Activity 1 starts a Service, using the standard Intent. Activity 1 starts Activity 2. Then, Activity 1 gets finished().
Now, there's only Activity 2.
How does Activity 2 kill the Service, since that Intent was generated in Activity 1? I don't want to pass the Intent everywhere...
Android:
CODE:...........
I launched this service from activity
In activity if condition satisfies start
CODE:......................
From my location service mentioned above could not launch activity, how can i get context of current running activity in service class.
I have the folowing method in a Service in my appplication: Code... Do I have to do an AIDL or is there a simpler way?
View 2 Replies View RelatedIs it possible to get the currently running activity through Service..?
i.e. I have a service started by an Activity A, and now I want to stop the service by another activty say Activity B.
Since Activity B doesnt know about the service, i want to capture the events in OnKeyDown() of the Activity B in my service...
Is this possible.. How can i get the Activity B's object..?
Starting from the example ServiceStartArguments.java of the "API demos", the service "ServiceStartArguments" is creating a new Handler object (ServiceHandler) which does all the work in a separate thread. Once that work is completed, how can I tell other components that my work is finished, and also provide data (that resulted from the work) to them?
I tried something like startActivity(intent_transferred_via_msg) which does not work, I'll get an exception because I call it "outside of the service", which is technically true.
Could some one please tell me how to invoke an activity from a service when the service receives some content from a server. the service keeps getting the data and the activity needs to update itself.
I am unable to find a good tutorial for broadcast intents stuff.