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Old 08-07-2008, 02:48 AM   #1 (permalink)
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Question How to do call back?

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I want to read the XML contents using http connection in a new thread and once the content has been read, I want the control to comeback to the main thread and execute the statement just after the one which invoked the thread.

something like return the value...

is it possible or any alternate method is there?
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Old 08-07-2008, 08:03 AM   #2 (permalink)
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i'll try to explain it a bit more simple.

you have your application A.
create an interface I. Add a method hurraTheDataAreThere(byte[] data).
Let A implement I.
Alter your connection thread to take an I as a parameter.
The interface there is to limit the access to only this one method.

In code this would look something like
Code:
//in your app
I callback = this;
new ConnectionThread(callback).start();

//in the connectionthread after the data are there
callback.hurraTheDataAreThere(data);

//in the application:
public void hurraTheDataAreThere(byte[] data){
System.out.println("hurra, the data are there! And they are "+data.length+" long");
}
in general you could also just pass the application object to your connection thread. but better to start with best practices instead of learning them later.
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