Android and Facebook SDK - Post on Page wall like a page

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http://stackoverflow.com – I have a big issue, I'm developing a App for android, this app need post images on Wall Pages of facebook. The only place I can post anything, is on "Recent Posts by Others People", and I need post the image on "main" wall. So, I need Upload the image like Page and no like a User. Can I do that? (HowTos)