in app/src/main/java/com/google/firebase/example/fireeats/MainActivity.java [186:197]
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_add_items:
onAddItemsClicked();
break;
case R.id.menu_sign_out:
FirebaseUtil.getAuthUI().signOut(this);
startSignIn();
break;
}
return super.onOptionsItemSelected(item);
}