how local service can invoke a sync method on it's main activity?

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how local service can invoke a sync method on it's main activity?

Hi, ive 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. (the method exists in the activity)

thanks.

Just call the method.

CommonsWare 2010-05-02 13:08:18

i am calling the method , exaclly as you explain in your example with sendBroadcast(broadcast), but in the api it says this operarion is async, i need the service actully to wait for an answer.how i could do that?

rayman 2010-05-02 15:53:04

Ah, now I understand. sendBroadcast() is async, and there is nothing you can do about that. You will need to use another mechanism if you want synchronous calls. Have the activity register a listener object with the service, and have the service call that listener object. That call will be synchronous. Just be careful about your threads -- if you're calling the listener from a background thread, the activity may need to do something to update the UI in the foreground.

CommonsWare 2010-05-02 16:41:59

Do you have some smaple of this mechanism?

rayman 2010-05-03 05:55:35

Yes, but it's fairly deep into a chain of tutorial exercises: http://github.com/commonsguy/cw-andtutorials/tree/master/18-LocalService/Patchy/

CommonsWare 2010-05-03 12:23:19

I am learning alot from your tutorials! also following your comments from several forums! i was trying to look in those sources, you think you could guide me more specificly in them, where i could find this sync mechanism call which you made? thanks, ray.

rayman 2010-05-03 15:32:56

I'm going to have to point you to the book that those tutorials come from: http://commonsware.com/AndTutorials/

CommonsWare 2010-05-03 16:35:15

you pointed me to http://github.com/commonsguy/cw-andtutorials/tree/master/18-LocalService/Patchy/isnt the example of sync task from local service to it's host application, is there?

rayman 2010-05-04 06:04:15

Yes, there is. Look at the service implementation, where it calls a callback supplied by the activity.

CommonsWare 2010-05-05 03:45:35

I found a wierd way to do it but it works, adding listener to the prefrences while register to it in the main activity, so when the value is being channge on the main activity then the listener being trigger on the service. this way it can be sync.

rayman 2010-05-04 13:46:30

ansaurus

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how local service can invoke a sync method on it's main activity?

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