auth/app/src/main/java/com/google/firebase/quickstart/auth/java/EmailPasswordFragment.java [180:205]:
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    private void sendEmailVerification() {
        // Disable button
        mBinding.verifyEmailButton.setEnabled(false);

        // Send verification email
        final FirebaseUser user = mAuth.getCurrentUser();
        user.sendEmailVerification()
                .addOnCompleteListener(requireActivity(), new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        // Re-enable button
                        mBinding.verifyEmailButton.setEnabled(true);

                        if (task.isSuccessful()) {
                            Toast.makeText(getContext(),
                                    "Verification email sent to " + user.getEmail(),
                                    Toast.LENGTH_SHORT).show();
                        } else {
                            Log.e(TAG, "sendEmailVerification", task.getException());
                            Toast.makeText(getContext(),
                                    "Failed to send verification email.",
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }
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auth/app/src/main/java/com/google/firebase/quickstart/auth/java/MultiFactorFragment.java [130:155]:
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    private void sendEmailVerification() {
        // Disable button
        mBinding.verifyEmailButton.setEnabled(false);

        // Send verification email
        final FirebaseUser user = mAuth.getCurrentUser();
        user.sendEmailVerification()
                .addOnCompleteListener(requireActivity(), new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        // Re-enable button
                        mBinding.verifyEmailButton.setEnabled(true);

                        if (task.isSuccessful()) {
                            Toast.makeText(getContext(),
                                    "Verification email sent to " + user.getEmail(),
                                    Toast.LENGTH_SHORT).show();
                        } else {
                            Log.e(TAG, "sendEmailVerification", task.getException());
                            Toast.makeText(getContext(),
                                    "Failed to send verification email.",
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }
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