>   //show
>   ad.show();

When you call show(), the dialog is scheduled for display, but the UI
thread keeps running which means...

>   //How come the following is "null" ???
>   //when it shoudl be "hello" on a button click
>   return pl.prompt;

That this line of code executes right after show() finishes, not after
the user clicks the button. Your listener has not been invoked yet at
this point. show() is not a blocking call.
-- 
Romain Guy
www.curious-creature.org

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