更新 Firebase 使用者的電子郵件

public class ChangeEmailActivity extends BaseAppCompatActivity implements ReAuthenticateDialogFragment.OnReauthenticateSuccessListener {

    @BindView(R.id.et_change_email)
    EditText mEditText;
    private FirebaseUser mFirebaseUser;

    @OnClick(R.id.btn_change_email)
    void onChangeEmailClick() {

        FormValidationUtils.clearErrors(mEditText);

        if (FormValidationUtils.isBlank(mEditText)) {
            FormValidationUtils.setError(null, mEditText, "Please enter email");
            return;
        }

        if (!FormValidationUtils.isEmailValid(mEditText)) {
            FormValidationUtils.setError(null, mEditText, "Please enter valid email");
            return;
        }

        changeEmail(mEditText.getText().toString());
    }

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        mFirebaseUser = mFirebaseAuth.getCurrentUser();
    }

    private void changeEmail(String email) {
        DialogUtils.showProgressDialog(this, "Changing Email", "Please wait...", false);
        mFirebaseUser.updateEmail(email)
                .addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        DialogUtils.dismissProgressDialog();
                        if (task.isSuccessful()) {
                            showToast("Email updated successfully.");
                            return;
                        }

                        if (task.getException() instanceof FirebaseAuthRecentLoginRequiredException) {
                            FragmentManager fm = getSupportFragmentManager();
                            ReAuthenticateDialogFragment reAuthenticateDialogFragment = new ReAuthenticateDialogFragment();
                            reAuthenticateDialogFragment.show(fm, reAuthenticateDialogFragment.getClass().getSimpleName());
                        }
                    }
                });
    }

    @Override
    protected int getLayoutResourceId() {
        return R.layout.activity_change_email;
    }

    @Override
    public void onReauthenticateSuccess() {
        changeEmail(mEditText.getText().toString());
    }
}