Android :: Running Activity From Local Service
Sep 13, 2010
I'm trying to create a program with a service that runs every 10 seconds, puts the camera preview, taking a picture and then leaving the user to continue his work (closing down). Currently I have two problems:
1. After I'm taking the picture, the preview still there. There's no function like close() to return to the previous activity. How can I return to the previous activity?
2. I'm trying to run the above described activity from the run() function (from the timer class that execute the run() function every 10 seconds). When I do that, a runtime exception is raised. But when I start the above described activity from a button clicked (not from the timer) it works fine.
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Feb 22, 2009
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.
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Jun 1, 2010
I'm trying to think of a way on how to sync in between a local service and the main activity.
The local service has,
A thread with a socket connection that could receive data at any time.
A list/array with data.
At any time the socket could receive data and add it to the list.
The activity needs to display this data. So when the activity starts up it needs to attach or start the local service and fetch the list. It also needs to be notified if the list is updated.
I think I would need to sync my list somehow so the local service does not add a new entry to it while the activity fetches the list when connecting to the service.
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May 2, 2010
I've configured local service under some app i wanna know how could i invoke methods on the activity, through the service in a synchronous way for example the service invoke a method inthe activity and waiting for for result(synchronous) from it.
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Apr 13, 2010
When I do various operations on bluetooth application ... scanning, renaming and discoverable after some time non of these works... if I try to change name, it is not reflecting. is it problem with Activity/service? How to check whether these are still running? How to debug such cases?
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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 13, 2009
I want to develop a application that continuously running in background as service. And after that if i press any numeric key, it should start an application.
I have developed a service which is running continuously. Is it possible in Android?
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Aug 4, 2009
I have been looking for this for a while but I can't find any way of doing it. A contrived example would be a service that simply displays the name of the current running activity as an Ongoing Notification. For instance, when the user is reading a particular email, the name of the activity (hopefully the email title!) would appear in the notifications window and when the user switches to read a text message, the notification would change to show the name of the new activity. Is there a way to do this in Android?
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Dec 9, 2009
I've created my first service, and it's all gone fine, except when the main activity is stopped. What I want is for a user action (button press etc) to start the service, which it does. Then I want the user, some time later, to press another button to stop the service. Which it does. But if the main activity loses focus (i.e. I go to the home screen) when I return to the activity it has no knowledge of the service anymore - even though the service is still running. When the activity resumes, how do I find out a) if the service is running, and if so b) re-bind to it, so that I can then stop it and collect the data I'm after.
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Aug 8, 2010
I have an API Object that I made, and I would like to share it between a running Service and various Activities in my app, almost like if I was to make the class static. How could I go about sharing the created object between the two?
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Nov 19, 2010
I have an application in which there will be a service continuously running in background and on certain conditions service should call an activity or pop-up a dialog. I think this is possible. The question is, in case device keyguard gets on say after 2 minutes of idle time then will the service continue running in background. And what will happen when the condition of opening pop-up or Activity is reached.
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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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Jul 16, 2010
I don't see the point of using a local service in Android. If I want to do backgound stuff, I can create a thread and use Handlers.
Creating a local service is a big headache, you have to mess with Binders, worry about the start/stop/bind/unbind lifecycle, etc.
What does a local service get me that a thread doesn't ?
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Oct 6, 2010
I have an application which requires networking service. I took on LWUIT4IO and adjusted it to my needs so now i have a network queue that can run one or more network threads.Now, my application is based on single root activity that spawns other child activities as needed (it's a reservation center for vacations, car rental etc.. each in it's own activity). The network is common to all and should be used by all activities. the network thread requires, basically, a callback to notify it's finished and return the result (input stream or byte array) .At first i thought that i should use a service instead of a singleton that will be started in the root activity(the service will also be started in the root activity), however working with a local service is problematic for me: 1. no callbacks which makes me use intents to encapsulate the request esponse in intents time consuming, also since there is not single point of listening (i have to use BroadcastReceivers)i have to add a calling class name or some other identifier so the sender of the request will know it's for him, i think this is also a waste of time and resources since i need only one listener.
i think i CAN use callbacks if i use Binder object to return local instance of my Service and then use the queuing method directly, this is problematic for me as acquiring Binder object is asynchronous and i need it 'on the spot' 3. I thought of using a static instance of the service and null it in onDestroy of the service, but if i use that way, i'm not so sure i need a service... 4. i saw a small answer in stackoverflow about inheriting application and putting whatever member you need there so when you use getApplication you get this instance and then you can retrieve whatever you want, is this even advisable ?
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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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Jun 11, 2010
I'm starting a service in my application using startService.
I do not want to use bindService as I want to handle the service life time myself.
How can I get an instance to the service started if I do not use bindService? I want to be able to get a handler I've created in the service class to post messages from the activity.
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Sep 9, 2009
I have the following base activity. code...
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May 31, 2010
I don't need a strict code related answer I just need somebody to tell me what I am missing.My application has to retrieve from a web service (xmlrpc) the positions of some users I know and update their position on a MapView.So I decided to use a Service and an Activity extending MapActivity to show results.
I thought about two solutions:
I ) start the service and make it ask every minute for these positions and send them to the activity as a bundle via intent. (This didn't work out well, since once shown I couldn't find a method to let the activity continue refresh itself until she stop receiving intents+data from the service)
II ) Incorporate a thread within the activity which starts the service via context.startService(...) every minute. And the MapUI refresh itself once the service send back an intent and stop itself. (Maybe I will fall in the same problem category as before I haven't tryied yet).
I am also giving directions (via maps.google ws) in this way I'd like to refresh only users positions on the map and save the route.What Am I missing do you have any suggestions? related to activities/services internal mechanics, don't know launch modes, use broadcast receivers or intent filters?
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May 16, 2010
An application I'm building uses a local Service for downloading files from the web to the phone's SD card. In this app users can browse lists of books, and read them while online. A user can also download a pdf copy of a book for offline viewing. To handle downloads I'm using a locally bound Service. I do not want this Service to run all the time, only when downloading files. So that the Service can shut itself down when its tasks are complete, I am not binding to the service, rather I'm sending an "enqueue for download" command through the Intent passed to Context.startService.
Books available for download are shown in a list. A user can choose to download a book by clicking on its row in the list. On download, I need to show download progress using a ProgressBar on the actual book list row. I need to also show, on the rows, if a book is enqueued for download, or if its download has completed or failed. The books can be shown in different activities throughout the application--in search, or in the user's list of favorite books, for example. When the books are shown in different places, these are not the same objects, but they are uniquely identified by their bookId...............
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Jun 24, 2010
HTo be able to write "nice" code between my application/activies and a local service I need to understand some basic Android concepts:What I'm wondering is if my application (as in my activities) and my local service is sharing one thread. I.e. when the activities and the local service executes tasks queued are these tasks interleaved in ONE thread thus sharing the thread or does the service has a thread of its own?Also if the local service shares the thread with the activities and the local service makes a direct call (via a callback) to one of the activities (i.e. no post message) is the activity thread "halted" or is the execution of that specific function queued to be executed later anyway?
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Sep 30, 2010
How do I check whether the local service inside my application is running?
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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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May 6, 2010
Essentially my problem is this, I open my Activity. It binds to a local service that "appears" to be connected. I get a force close when I press the back button:
"IllegalArgumentException: Service not registered" when unbind is called in my onPause method...
public void onPause() { super.onPause(); if (isFinishing()) {
if (mConnection != null){ Log.i(TAG,"onPause, mConnection" + mConnection.toString());
mDbS.unbindService(mConnection); }else { Log.i(TAG,"mConnection is null");
} The service is bound in onCreate // bind to our sdCard database using our Service Connection
mServiceIntent = new Intent(this,DatabaseService.class);
if(bindService(mServiceIntent, mConnection, Context.BIND_AUTO_CREATE)){
Log.e(TAG, "service bound"); }else{ Log.e(TAG, "service not bound");
} bindService is returning true.
My Service connection is as follows. onServiceConnected is called and goes to completion. onService Disconnected is never called (presumably because my service is in same process)
private ServiceConnection mConnection = new ServiceConnection() {
public final String TAG = "LoadView.ServiceConnection"; //$NON- NLS-1$
public void onServiceConnected(ComponentName className, IBinder service) {
mDbS = ((LocalBinder<DatabaseService>) service).getService(); .....
stuff not relevant.... Log.i(TAG, "finished onServiceConnected");
//$NON-NLS-1$ } public void onServiceDisconnected(ComponentName className) {
Log.e(TAG, "onServiceDisconnectedCalled"); //$NON-NLS-1$ } };
The only thing I do a little different is that I don't use an inner class in my service for the Binder object - I use a separate class. This is mostly because I have several databases and wanted code I could reuse and set up simply rather than worry about all the ins and outs and memory leak issues.
import android.os.Binder; import android.util.Log;
public class LocalBinder<S> extends Binder { private String TAG = "LocalBinder";
private S mService; @SuppressWarnings("unused") private LocalBinder() {
} public LocalBinder(S service){ mService = service;
} public S getService() { return mService;
} public void finalize(){ mService = null;
try { //TODO reinstate this after Issue 8046 is resolved
//super.finalize(); } catch (Throwable e) { Log.e(TAG,"Unable to finalize Binder");
} } }
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Jul 2, 2013
I have an android app that must connect to my local webservice with soap but I cant seem to get it working. This is the code I have.
[HIGH]public void Hello()
{
String SOAP_ACTION = "http://tempuri.org/Hello";
String METHOD_NAME = "Hello";
String NAMESPACE = "http://tempuri.org/";
String URL = "http://10.0.2.2/MainService/MainService.asmx";
[Code]...
All this does is catch an exception with the message "Null". Note that I am not an android developer, this is my very first project.
I did the same thing with Netbeans and regular Java and it works perfectly.
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Jun 17, 2010
Would it be there noticeable speed improvement if I would create local references to needed view elements (e.g. EditText or Button) in my activity (in onCreate()) and use them for accessing needed elements or it does not much matter if I always use findViewById() when I need to access some particular element?
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Feb 14, 2009
I am having trouble running my application as every time i try to run it the simulator gives me a an error.
I looked through the Documentation but I couldn't find anything on user created classes.
CODE:.................
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Jan 10, 2010
I created an application which enables the user to set whether he wants to receive notification while the application runs in background mode. If the notifications are enabled an activity should be started (the dialog should appear on the screen).
I tried to enabled it the following way:
CODE:...........
This is the method from main activity. When onPause() is executed isRunningInBackground is set true.
When I tried to debug it when the main application was running in the background the line
startActivity(intent) had no effect (the activity didn't appear).
Does anyone know how to midify the logic in order to start an activity from the main activity when the main activity is running in the background (after onPause() is called)?
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Jul 16, 2010
I used Toast to make notification, but it seems it will appear even its activity is not in the current screen and some other activity has been started.I want to check this situation, when the activity is not the current one, I'd not send the Toast notification. But how to do ?
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