Share data from android application on facebook wall

view story

http://stackoverflow.com – I am a beginner, learning android. I am developing an android app which allows user to enter data, save it and able to see it on another page. I have done it and it works fine. Now I want users to share the data(text data) they have saved on their facebook wall through a share button within the app. I have looked at similar posts but they all post predefined messages on Facebook and I could not find anything useful. I will be thankful if someone could provide me with some information on this or tell me about any tutorials related to this. Thanks (HowTos)