How to force the user to complete a task before pressing back?

Posted by Pentium10 on Stack Overflow See other posts from Stack Overflow or by Pentium10
Published on 2010-03-21T20:44:27Z Indexed on 2010/03/21 20:51 UTC
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I show to user a list of categories, he must choose one.
How to force the user to choose before pressing back?

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