Android :: Binding A Remote Service From An Activity
Nov 23, 2009
I am binding a remote service from an activity and unbind the same on the onPause of the Activity,when the activity again restarts i bind the service .It does bind with the remote service and i am also successful in getting the remote-service method getting executed after the restart.But when returning a message from the callback-RemoteCallbackList.the mCallbacks.beginBroadcast returns me 0 clients.Am i missing some thing here ?why am i am getting zero clients when I call mCallbacks.beginBroadcast.?
CODE:....................
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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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Jul 1, 2010
Is there any fundamental difference in binding a service to an android.app.Activity vs binding it to an android.app.Application. I want to bind the service to an Application because I want to keep some global state/data in the Application instead of duplicating it in all my activities.
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Oct 8, 2010
My initial activity is basically a splash screen while preforming initialization and login in to network server. To save memory I want to finish() the splash activity once it starts the main menu activity. I still want the remote service to operate. Testing shows it does. But am I going to get into trouble doing this? I know I can restart the remote from the main menu activity but I am trying to save overhead by not starting it twice. The remote service is required by the splash activity.
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Apr 29, 2010
Iam trying to run an activity from diffrent package from my remote service:
This is how i implement the service.java
CODE:....
Ive also added a line in the manifest of the service:
The service works fine, but i cant run the activity -> PushActivity which is in diffrent package of diffrent application, this is the error:
Activity not found Exception: No Activity found to handle Intent {act=com.pushservice.PushServiceActivity flq=0x10
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Nov 19, 2010
I wrote an android program that: has a main activity for UI, and it starts a service. The service timely callbacks the UI activity to update views. It works fine except: if the activity is closed (with BACK) and start again, the service will also be started again (The service plays audio file, so there are two overlapped sounds). I use bindService with BIND_AUTO_CREATE flag to start and connect to service. According to the document, it should create service only if it doesn't exist, but obviously it starts another instance when opened second time. All I want is when the activity is closed, the service goes on running, and when the activity opens again, it can reconnect to the service. Is that possible? Or I just misunderstand the usage of service?
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Nov 24, 2010
In onCreate method of Activity, it binds to a remote service and makes use of AIDL intefaces. Is it required to unbind from the remote service when onDestroy is called on screen orientation change.?
If the activity un-bounded from the remote service in onDestroy and if no other contexts are bound to remote service, is remote service likely to get stopped losing the state that it maintains.?
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Jul 16, 2010
I'm trying to understand remote services at the moment and everything works fine, i can start the service and know how to communicate with it through the AIDL-interface. My problem is that the service seems to still run in the same process like the activity it was started from, because the activity crashes too, if there is an error thrown in the Service.
I set the service process to remote ( android:process=":remote" ) so what am i doing wrong? Or what do i have to do to unbind the service-process completely from the activity-process?
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Oct 5, 2009
I am very new beginner, and I am designing a small application as below.
- After a user starts the application, he/she can click the start button to start a background task. (e.g. retrieving the news headlines periodically, then do something...)
- Even after the user quits the application, the background task still running.
- To stop the background task, the user needs to run the application again, and clicks the stop button to stop the background task.
In the above scenario, what API should I use ? (Local Service Binding ? Remote Service Binding ? Handler ?)
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Apr 30, 2010
Can one service be bound to n activities?
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Jun 24, 2010
After I Bind to a service inside the method I start a CountDownTimer. The problem is that the timer does not start counting down. I have gone through with the debugger and sure enough it is executing the method that starts the Timer.If I use a button to start the timer it works! What could I be doing wrong?
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Aug 3, 2010
I have a service component (common task for all my apps), which can be invoked by any of the apps. I am trying to access the service object from the all activities, I noticed that the one which created the service [startService(intent)] has the right informaion. But rest does not get the informaion needed.
My Code is as below:
CODE:................
If I invoke startService(intent). it creates a new service and runs in parallel to the other service.
If I don't invoke startService(intent), serviceObj.getData() retuns null value.
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Nov 13, 2010
I am writing application that has service that provides real time data to subscribers via remote callback mechanism. Now I wanted to add a widget that visualizes essential part of this data but got error: "IntentReceiver components are not allowed to bind to services". So what's the right way to get data from that service?
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Jul 30, 2010
I made a code for my understanding of Android Service class.
It has just a single Activity and Service in apk. Service is the same as the sample code of API reference as below: http://developer.android.com/intl/ja/reference/android/app/Service.ht...
A client side is an Activity based on the above sample, and just added the following code:
CODE:.......
My sample application has a check box which starts(binds)/unbind to the local service on a single process. The local service instance is created by every bind request (and destroyed by every unbind).
If I press the button repeatedly, then LocalService$LocalBinder is leaked!
The problem is not resolved even If I set an obtained binder to null (like below).
CODE:...............
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Feb 20, 2010
I want to know what es the best place in an Activity to bind to a service? I saw examples doing it in onResume() and also in onCreate(). I was asking myself if it is not a problem putting it into onCreate(), cause in onPause() i will do a unbind to the service, so i dont get a serviceConnectionLeak, if i leave the activity. Now if i press the Home-Button and then switching to the HomeScreen, the Activity will unbind from the service, when i go back to the Activity from the Taskmanager, then onCreate() will not be called and if the Code is trying to access a function from the service i will get a null-pointer exception. If i bind and unbind only in onResume() and onPause() i dont have this problem.
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Sep 15, 2010
My application has the following components: 2 Activities A Service and a BroadcastReceiver
Whenever the user updates the system time, my broadcast receiver receives the Intent.ACTION_TIME_CHANGED. Now when this happens I want to reschedule a Handler in my Service. How do I bind to a Service within my BroadcastReceiver?
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Nov 20, 2010
I have a local Service to which multiple activites needs to bind. In the first launched Activity, bindService returns true and onServiceConnected is called. But in any additionally launched activites bindService returns false, and I can't get a reference to my Service.
How can multiple activities simultaneously be connected to a local Service?
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Sep 14, 2009
As a point of example for my problem, I wrote a single Activity which binds to a service and then accesses a property to display. The problem is that my TestServiceConnection.onServiceConnected method is never called, and I don't know why.
Here is the code:
CODE:......................
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Feb 12, 2010
Is is possible to send an object to an Android Service through an Intent without actually binding to the service? Or maybe another way for the Service to access Objects...
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Sep 15, 2010
I'm binding to a local Service (that is, not using IPC and AIDL) from several activities. I want to ensure that I'm not holding references to this service from activities that the user isn't using. My options are: 1.) to bind to the service in onCreate() and unbind in onDestroy(). 2.) bind in onStart() and unbind in onStop(). 3.) bind in onResume() and unbind in `onPause(). Or some combination of these. Which is the best-practice way of binding and unbinding to a local service? Do I not need to be concerned with holding local connections from stopped activities? Additionally, once bound to this particular service I am retrieving a Cursor which is attached to my ListActivity via a CursorAdapter. The data retrieved by the Cursor may have changed while the Activity was out of view so I want to requery it when the Activity is shown again. If I bind in onCreate() I can requery in onRestart(). If I bind in onResume() each time the data will be fresh because I'll query it in the Service's connected callback.
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Nov 9, 2010
I'm confused about whether I need to run my service in a separate process. What are the advantages / disadvantages of each?For reference I'm trying to create an App that uses a service to play [streaming] audio in the background. So which one is better for my use case?
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Sep 30, 2009
i have an app that binds to a local service.I want to add a desktop widget that binds to the same service. does my service have to be a remote service or can it still be local?if it can still be local, how can I get at the local binder?
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May 28, 2010
I'm developing a GPS tracking software on android. I need IPC to control the service from different activities. So I decide to develop a remote service with AIDL.This wasn't a big problem but now it's always running into the methods of the interface and not into those of my service class. Maybe someone could help me?If i now try to call a method from an activity for example start(trackId) nothing happens. The binding is OK. When debugging it always runs into the startTracking() in the generated ITrackingServiceRemote.java file and not into my TrackingService class. Where is the problem? I can't find anything wrong.
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Sep 24, 2009
I've implemented remote service using aidl & it is working fine if I'm using its service from same package. But If I tried to use the service from other application it gives me error
As below:
CODE:...................
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Sep 22, 2009
I am studying RemoteService example in Android's APISample. In the manifest file, it declares the service like this: My question is how can I specify the service to be 'auto-start', i.e. it gets start whenever the phone start?
<service android:name=".app.RemoteService" android:process=":remote" >
<intent-filter>
<!-- These are the interfaces supported by the service, which
you can bind to. -->
<action
android:name="com.example.android.apis.app.IRemoteService" />
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Aug 11, 2010
I have implemented a RemoteService which will increment a countere ( just for testing purposes ). Therefore I have a Task class which implements Runnable and the method run() where a infinite while loop increments the variable.
From the client side, I start the RemoteService with startService and then i bind to the service. When I close the activity, the service is still running. Now i want to rebind to the service.
How do I know if the service has already been started (therefore i would only need to bind to the service again) or not (then I would need to call startService() first and then bind to the service)?
What would happen, if I call startService() if the service is already running? Does the OS start a second service, or will it affect the service which is already running?
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Jul 28, 2010
I have a service MyService.java in Application "ServiceDemo". The manifest of this application looks like this
CODE:.............
I have another application "CallerService" manifest looks like this
CODE:................
I have an activity from where I m trying to start the service on the click of the button
CODE:................
This fails to work. Says "unable to start service intent"
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Apr 30, 2010
I defined a remote service over a AIDL file. Now i want to access this service in a different application. But how can I do that? The AIDL file is not accessible in my second application, and if i just copy the AIDL file, then the service can't be found.
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Jan 20, 2010
I'm hoping to do some audio processing in a remote service (service I've spawned onto its own thread); this will basically occur in a while (1) loop so constant processing. Occasionally I want to provide some information back to the activity that is bound to the service; I'm doing this by sending a broadcast from the service, that is received by a broadcast receiver on the activity, which then uses the activity's service connection to call into the service and get the information needed; at this point the broadcast receiver makes an alert dialog presenting the information to the user.If I stay in my while(1) loop after raising the broadcast, the action in the broadcast receiver never seems to occur.This is confusing to me since the activity and service are in separate threads.If I end the loop after raising the broadcast, the desired behavior on the activity side occurs, but of course this isn't acceptable since I need to be doing constant processing.
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