AuthenticateFragment.java 文件源码

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (!FacebookSdk.isInitialized()) {
        FacebookSdk.sdkInitialize(getApplicationContext());
        AppEventsLogger.activateApp(getActivity().getApplication());
    }
    // Initialize Firebase Auth
    fireBaseAuth = FirebaseAuth.getInstance();
    fireBaseAuth.signOut();

    facebookCallbackManager = CallbackManager.Factory.create();
    registerFirebase();
    registerFacebookCallback();
    LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("email", "public_profile"));
}