Facebook API (Android) incrementing post

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http://stackoverflow.com – Hy! I'm writing an android application, and I connected my application with facebook. And I want to post on my wall when I click on a button like "Blabla bla 1 blabla". And when I click on the button the second time I want to update the previous post to "Blabla bla 2 blabla". Is this possible. I looked over the facebook api, but I couldn't find a solution. (HowTos)