public void onViewCreated()

in auth/app/src/main/java/com/google/firebase/quickstart/auth/java/PhoneAuthFragment.java [61:164]
71 lines of code
7 McCabe index (conditional complexity)

    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        // Restore instance state
        if (savedInstanceState != null) {
            onViewStateRestored(savedInstanceState);
        }

        // Assign click listeners
        mBinding.buttonStartVerification.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!validatePhoneNumber()) {
                    return;
                }
                startPhoneNumberVerification(mBinding.fieldPhoneNumber.getText().toString());
            }
        });
        mBinding.buttonVerifyPhone.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String code = mBinding.fieldVerificationCode.getText().toString();
                if (TextUtils.isEmpty(code)) {
                    mBinding.fieldVerificationCode.setError("Cannot be empty.");
                    return;
                }
                verifyPhoneNumberWithCode(mVerificationId, code);
            }
        });
        mBinding.buttonResend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!validatePhoneNumber()) {
                    return;
                }
                resendVerificationCode(mBinding.fieldPhoneNumber.getText().toString(), mResendToken);
            }
        });
        mBinding.signOutButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                signOut();
            }
        });

        // Initialize Firebase Auth
        mAuth = FirebaseAuth.getInstance();

        // Initialize phone auth callbacks
        mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {

            @Override
            public void onVerificationCompleted(PhoneAuthCredential credential) {
                // This callback will be invoked in two situations:
                // 1 - Instant verification. In some cases the phone number can be instantly
                //     verified without needing to send or enter a verification code.
                // 2 - Auto-retrieval. On some devices Google Play services can automatically
                //     detect the incoming verification SMS and perform verification without
                //     user action.
                Log.d(TAG, "onVerificationCompleted:" + credential);
                mVerificationInProgress = false;

                // Update the UI and attempt sign in with the phone credential
                updateUI(STATE_VERIFY_SUCCESS, credential);
                signInWithPhoneAuthCredential(credential);
            }

            @Override
            public void onVerificationFailed(FirebaseException e) {
                // This callback is invoked in an invalid request for verification is made,
                // for instance if the the phone number format is not valid.
                Log.w(TAG, "onVerificationFailed", e);
                mVerificationInProgress = false;

                if (e instanceof FirebaseAuthInvalidCredentialsException) {
                    // Invalid request
                    mBinding.fieldPhoneNumber.setError("Invalid phone number.");
                } else if (e instanceof FirebaseTooManyRequestsException) {
                    // The SMS quota for the project has been exceeded
                    Snackbar.make(view, "Quota exceeded.",
                            Snackbar.LENGTH_SHORT).show();
                }

                // Show a message and update the UI
                updateUI(STATE_VERIFY_FAILED);
            }

            @Override
            public void onCodeSent(@NonNull String verificationId,
                                   @NonNull PhoneAuthProvider.ForceResendingToken token) {
                // The SMS verification code has been sent to the provided phone number, we
                // now need to ask the user to enter the code and then construct a credential
                // by combining the code with a verification ID.
                Log.d(TAG, "onCodeSent:" + verificationId);

                // Save verification ID and resending token so we can use them later
                mVerificationId = verificationId;
                mResendToken = token;

                // Update UI
                updateUI(STATE_CODE_SENT);
            }
        };
    }