Based on what you've explained so far, I think you are running your loop on the main (UI) thread, and are thus blocking it from doing anything else, which includes updating the UI.

Have you read this:

http://developer.android.com/guide/topics/fundamentals/processes-and-threads.html#Threads

http://developer.android.com/resources/articles/painless-threading.html

-- Kostya

07.07.2011 12:12, wu mark ?????:
But It doesn't display the screen that I display in the loop. I don't think it had executed the loop part.
Mark

2011/7/6 saurabh chatterjee <chattsaur...@gmail.com <mailto:chattsaur...@gmail.com>>

    may be your code is getting entangled in an infinite loop. have you
    tried using "break" ?

    On Jul 6, 4:51 pm, mark2011 <androidmark2...@gmail.com
    <mailto:androidmark2...@gmail.com>> wrote:
    > Dear All :
    >
    >    I met a strange event. I write a simple code to display a screen
    > once the user click a button to start. In the screen, the user can
    > click some button to set up the factors that I use
    onclicklistener to
    > accept the onclick. But the start button is that I use onclick to
    > start. Once I use a loop using the for/while command to loop the
    > display the screen. The start button doesn't work. Can anyone
    help me?
    >
    > Thanks.
    >
    > BR,
    > mark

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