Android/Facebook: Post message on wall

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http://stackoverflow.com – I would like to post a message on the my own wall via an Android application. I have the method loginToFacebook() to login. On click on a button, if the user is logged in I want a message to be posted. I am not really familiar with facebook API so I've looked the facebook developers documentation and other sites on internet to propose the code that follows. Yet, no message is posted on my wall. Obviously I miss something but I don't know what as I have no error on my LogCat. public class ShareActivity extends Activity implements OnClickListener{ Facebook facebook = new Facebook("477110419 (HowTos)