первое приложение:
SharedPreferences prefs = getSharedPreferences("test_prefs",
Context.MODE_WORLD_READABLE);
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean("pref_key", true);
editor.commit();
второе приложение:
/* where com.example is the first app containing the preferences */
Context myContext = createPackageContext("com.example",Context.CONTEXT_IGNORE_SECURITY);
SharedPreferences testPrefs = myContext.getSharedPreferences
("test_prefs", Context.MODE_WORLD_READABLE);
boolean data = pref.getBoolean("pref_key", false);