In general, one should either use Looper and Handler, or use AsyncTask. Mixing and matching the two is a recipe for confusion. If AsyncTask offers you the flexibility and control you need, use it and forget about Looper/Handler.
The rules you cite are only for AsyncTask and its handy methods. They do not apply to Looper/Handler which, being more flexible, have a more complicated/subtle set of rules. I haven't seen them documented in one place like for AsyncTask though. One of my favorite books on Android refers to Looper/Handler as "the Swiss-army knife" of concurrency on Android. But at least a Swiss-army knife doesn't need a detailed set of Javadoc documentation to figure out how to use it;) On Sep 13, 8:11 am, Kostya Vasilyev <[email protected]> wrote: > Donal, > > You having to call Looper.prepare makes it seem like you're not creating > your task and calling its execute() from the UI thread. > > Is that so? The docs is actually quite clear on this, see "Threading rules": > > http://developer.android.com/reference/android/os/AsyncTask.html > > 13.09.2010 18:50, Donal Rafferty пишет: > > > > > Kostya, > > > I do create a new Task as follows everytime: > > > new SelectRingtoneTask().execute(); > > > But I had to use Looper.prepare(); to get it to work in my Service, > > this could be causing an issue? > > > Is there a proper way to use a AsyncTask in a Service without needing > > to call Looper.prepare();? > > > 2010/9/13 Kostya Vasilyev <[email protected] <mailto:[email protected]>> > > > Donal, > > > It sort of seems like you reuse the same task over and over. > > > What happens if you create a new task each time you need to > > perform the asynchronous operation? > > > -- Kostya > > > 13.09.2010 17:44, Donal Rafferty пишет: > >> Kostya, > > >> Thanks, that conversation can be seen here: > > >> http://groups.google.com/group/android-developers/browse_thread/threa... > > >> However the condition is in the cancel code, which I no longer > >> use as I am running the code in a Service so I have no need to > >> cancel it. > > >> 2010/9/13 Kostya Vasilyev <[email protected] > >> <mailto:[email protected]>> > > >> Donal, > > >> Search the list: there was a post within the last month (I > >> think) from Romain Guy about some kind of thread race issue > >> in AsyncTask having been fixed in Froyo (or was it > >> post-Froyo?) - anyway, it's somewhere in the archives. > > >> -- Kostya > > >> 13.09.2010 16:07, Donal Rafferty пишет: > >>> Sorry I meant only the preExecute is run > > >>> On Mon, Sep 13, 2010 at 1:05 PM, Donal Rafferty > >>> <[email protected] <mailto:[email protected]>> wrote: > > >>> I have managed to implement the Task in my Service now > >>> but the original problem still remains. > > >>> I dont cancel the Task at all in my service, I simply > >>> play the ringtone in the postExecute method of the > >>> Asynctask if a flag is true, if its not I dont. > > >>> But I get the same issue, after a couple of runs the > >>> AsyncTask simply stops getting to the doInBackground > >>> method, only the postExecute method is run. > > >>> Its very strange and really annoying me now. > > >>> Is there any reason why an AsyncTask would behave like > >>> this without cancel being used? > > >>> On Mon, Sep 13, 2010 at 10:58 AM, Donal Rafferty > >>> <[email protected] <mailto:[email protected]>> wrote: > > >>> Monday morning coding! :) > > >>> I return my aidl definition in my service's onBind: > > >>> @Override > >>> public IBinder onBind(Intent arg0) { > >>> Log.d("XXX", "Status: onBind Called"); > >>> return myServiceStub; > >>> } > > >>> IBinder myServiceStub = new IMyService.Stub(){ > > >>> //aidl methods > > >>> }; > > >>> And use this to call methods from my Activity, so I > >>> would need to be able to import > >>> android.media.Ringtone in my aidl definition but I cant. > > >>> So I'm still stuck with it not working :( > > >>> On Mon, Sep 13, 2010 at 10:32 AM, Kostya Vasilyev > >>> <[email protected] <mailto:[email protected]>> wrote: > > >>> Donal, > > >>> No, a service is a service, and a binder is a > >>> binder. > > >>> The binder you get in the callback is the binder > >>> returned by the service's onBind. > > >>> This example: > > >>> > >>> http://developer.android.com/resources/samples/ApiDemos/src/com/examp... > > >>> has a binder implementation that returns a > >>> reference to its service, so you can do this > > >>> public void onServiceConnected(ComponentName > >>> className, > >>> IBinder binder) { > > >>> LocalService.LocalBinder binder = > >>> (LocalService.LocalBinder) binder; > >>> *LocalService service = binder.getService();* > >>> } > > >>> This example has one flaw: it leaks a service > >>> reference (since LocalBinder is a non-static > >>> inner class of LocalService). Using a static > >>> inner or a top-level class for LocalBinder, > >>> fixes that (AFAIK). > > >>> -- Kostya > > >>> 13.09.2010 13:16, Donal Rafferty пишет: > >>>> 09-13 10:06:53.566: > >>>> ERROR/AndroidRuntime(18791): Uncaught handler: > >>>> thread main exiting due to uncaught exception > >>>> 09-13 10:06:53.676: > >>>> ERROR/AndroidRuntime(18791): > >>>> java.lang.ClassCastException: > >>>> com.xxx.phone.MyService$1 > >>>> 09-13 10:06:53.676: > >>>> ERROR/AndroidRuntime(18791): at > >>>> > >>>> com.xxx.phone.ui.MyActivity$2.onServiceConnected(MyActivity.java:515) > > >>>> So it doesn't like the cast from binder to Service? > > >>>> How can I fix that do you know? What am I > >>>> missing from the example? > > >>> -- > >>> Kostya Vasilyev -- WiFi Manager + pretty widget > >>> --http://kmansoft.wordpress.com > > >>> -- > >>> You received this message because you are > >>> subscribed to the Google > >>> Groups "Android Developers" group. > >>> To post to this group, send email to > >>> [email protected] > >>> <mailto:[email protected]> > >>> To unsubscribe from this group, send email to > >>> [email protected] > >>> > >>> <mailto:android-developers%[email protected]> > >>> For more options, visit this group at > >>> http://groups.google.com/group/android-developers?hl=en > > >>> -- > >>> You received this message because you are subscribed to the > >>> Google > >>> Groups "Android Developers" group. > >>> To post to this group, send email to > >>> [email protected] > >>> <mailto:[email protected]> > >>> To unsubscribe from this group, send email to > >>> [email protected] > >>> <mailto:[email protected]> > >>> For more options, visit this group at > >>> http://groups.google.com/group/android-developers?hl=en > > >> -- > >> Kostya Vasilyev -- WiFi Manager + pretty widget > >> --http://kmansoft.wordpress.com > > >> -- > >> You received this message because you are subscribed to the > >> Google > >> Groups "Android Developers" group. > >> To post to this group, send email to > >> [email protected] > >> <mailto:[email protected]> > >> To unsubscribe from this group, send email to > >> [email protected] > >> <mailto:android-developers%[email protected]> > >> For more options, visit this group at > >> http://groups.google.com/group/android-developers?hl=en > > >> -- > >> You received this message because you are subscribed to the Google > >> Groups "Android Developers" group. > >> To post to this group, send email to > >> [email protected] > >> <mailto:[email protected]> > >> To unsubscribe from this group, send email to > >> [email protected] > >> <mailto:[email protected]> > >> For more options, visit this group at > >> http://groups.google.com/group/android-developers?hl=en > > > -- > > Kostya Vasilyev -- WiFi Manager + pretty widget > > --http://kmansoft.wordpress.com > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to > > [email protected] > > <mailto:[email protected]> > > To unsubscribe from this group, send email to > > [email protected] > > <mailto:android-developers%[email protected]> > > For more options, visit this group at > > http://groups.google.com/group/android-developers?hl=en > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] > > For more options, visit this group at > >http://groups.google.com/group/android-developers?hl=en > > -- > Kostya Vasilyev -- WiFi Manager + pretty widget > --http://kmansoft.wordpress.com -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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