protected void onCreate()

in Fido/app/src/main/java/com/fido/example/fido2apiexample/Fido2DemoActivity.java [127:199]
57 lines of code
1 McCabe index (conditional complexity)

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_navigation);

        // START Google sign in API client
        // configure sign-in to request user info
        GoogleSignInOptions gso =
                new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                        .requestEmail()
                        .requestIdToken(Constants.SERVER_CLIENT_ID)
                        .build();

        // build client with access to Google Sign-In API and the options specified by gso
        googleApiClient =
                new GoogleApiClient.Builder(this)
                        .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
                        .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                        .build();
        // END Google sign in API client

        // START prepare main layout
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        progressBar = findViewById(R.id.progressBar);

        swipeRefreshLayout = findViewById(R.id.swipe_container);
        swipeRefreshLayout.setColorSchemeColors(getResources().getColor(R.color.colorAccent));
        swipeRefreshLayout.setRefreshing(true);
        swipeRefreshLayout.setOnRefreshListener(
                new SwipeRefreshLayout.OnRefreshListener() {
                    @Override
                    public void onRefresh() {
                        updateAndDisplayRegisteredKeys();
                    }
                });

        recyclerView = findViewById(R.id.list);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        adapter =
                new SecurityTokenAdapter(
                        new ArrayList<Map<String, String>>(), R.layout.row_token, Fido2DemoActivity.this);
        // END prepare main layout

        // START prepare drawer layout
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle =
                new ActionBarDrawerToggle(
                        this,
                        drawer,
                        toolbar,
                        R.string.navigation_drawer_open,
                        R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();
        NavigationView navigationView = findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        navigationView.setItemIconTintList(null);
        View header = navigationView.getHeaderView(0);
        userEmailTextView = header.findViewById(R.id.userEmail);
        displayNameTextView = header.findViewById(R.id.displayName);
        Menu menu = navigationView.getMenu();
        operationMenuItem = menu.findItem(R.id.nav_fido2Operations);
        signInMenuItem = menu.findItem(R.id.nav_signin);
        signOutMenuItem = menu.findItem(R.id.nav_signout);
        signInButton = findViewById(R.id.sign_in_button);
        signInButton.setSize(SignInButton.SIZE_WIDE);
        signInButton.setScopes(gso.getScopeArray());
        signInButton.setOnClickListener(this);
        // END prepare drawer layout

        // request SignIn or load registered tokens
        updateUI();
    }