You need to use Intents. Here's how to call the FB application (if it is installed):
Intent intent = new Intent();
intent.setClassName("com.facebook.katana","com.facebook.katana.ProxyAuth");
intent.putExtra("client_id", applicationId);
mAuthActivityCode = activityCode;
activity.startActivityForResult(intent, activityCode);
This code is taken from the Facebook API, which authorizes an action. Ajust to suit your needs. Code is Copyright 2010 Facebook, Inc., licensed under the Apache License, Version 2.0.
