I want to use the score I saved in unity in Eclipse to publish to the user's Facebook Feed

In Unity 4.0 there is the export to eclipse function.

1. I want to know how to modify the Unity project so to talk to eclipse to launch my Facebook Login

2. To access the player prefs I saved in Unity so in order for me to publish it to the user's facebook feed.

UPDATE: So I figured out to call methods and get variables inside my Eclipse Project from Unity. By export a .jar file from Eclipse and brought it into Unity.

Now my problem is to launch the login dialog from Unity. How do I do that? How do I start an activity from inside Unity?