使用Firebase作为后端的Android应用身份验证错误：statusCode = SIGN_IN_REQUIRED

Question

我一直致力于为我的Android应用设置Google+登录。使用我的网络应用程序的客户端ID和密码在Firebase上设置了后端，但在尝试使用Android Studio上的Google帐户登录后，它会引发以下运行时错误：

ConnectionResult {statusCode = SIGN_IN_REQUIRED，resolution = PendingIntent {3a466ee7：android.os.BinderProxy@2586e4da}，message = null}

以下是我的代码的一些重要摘要：

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mGoogleLoginButton = (SignInButton) findViewById(R.id.sign_in_button);
        mGoogleLoginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mGoogleLoginClicked = true;
                if (!mGoogleApiClient.isConnecting()) {
                    if (mGoogleConnectionResult != null) {
                        resolveSignInError();
                    } else if (mGoogleApiClient.isConnected()) {
                        getGoogleOAuthTokenAndLogin();
                    } else {
                    /* connect API now */
                        Log.d(TAG, "Trying to connect to Google API");
                        mGoogleApiClient.connect();
                    }
                }
            }
        });
        /* Setup the Google API object to allow Google+ logins */
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(Plus.API)
                .addScope(Plus.SCOPE_PLUS_LOGIN)
                .build();

        Firebase.setAndroidContext(this);
        mFirebaseRef = new Firebase("https://boiling-heat-5858.firebaseio.com");

        mAuthProgressDialog = new ProgressDialog(this);
        mAuthProgressDialog.setTitle("Loading");
        mAuthProgressDialog.setMessage("Authenticating with Firebase...");
        mAuthProgressDialog.setCancelable(false);
        mAuthProgressDialog.show();

        mAuthStateListener = new Firebase.AuthStateListener() {
            private TextView mLoggedInStatusTextView;

            private void setAuthenticatedUser(AuthData authData) {
                mGoogleLoginButton.setVisibility(View.GONE);
                String name = null;

                if (name != null) {
                    mLoggedInStatusTextView.setText("Logged in as " + name + " (" + authData.getProvider() + ")");
                }
             else {
                mGoogleLoginButton.setVisibility(View.VISIBLE);
            }}

            public void onAuthStateChanged(AuthData authData) {
                mAuthProgressDialog.hide();
            }
        };
        /* Check if the user is authenticated with Firebase already. If this is the case we can set the authenticated
         * user and hide hide any login buttons */
        mFirebaseRef.addAuthStateListener(mAuthStateListener);

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(Plus.API)
                .addScope(Plus.SCOPE_PLUS_LOGIN)
                .build();

        mGoogleLoginClicked = true;
        if (!mGoogleApiClient.isConnecting()) {
            if (mGoogleConnectionResult != null) {
                resolveSignInError();
            } else if (mGoogleApiClient.isConnected()) {
                getGoogleOAuthTokenAndLogin();
            } else {
                    /* connect API now */
                Log.d(TAG, "Trying to connect to Google API");
                mGoogleApiClient.connect();
            }
        }
    }

private void getGoogleOAuthTokenAndLogin() {
        /* Get OAuth token in Background */
        AsyncTask<Void, Void, String> task = new AsyncTask<Void, Void, String>() {
            String errorMessage = null;

            @Override
            protected String doInBackground(Void... params) {
                String token = null;

                try {
                    String scope = String.format("oauth2:%s", Scopes.PLUS_LOGIN);
                    token = GoogleAuthUtil.getToken(OAuth.this, Plus.AccountApi.getAccountName(mGoogleApiClient), scope);
                } catch (IOException transientEx) {
                    /* Network or server error */
                    Log.e(TAG, "Error authenticating with Google: " + transientEx);
                    errorMessage = "Network error: " + transientEx.getMessage();
                } catch (UserRecoverableAuthException e) {
                    Log.w(TAG, "Recoverable Google OAuth error: " + e.toString());
                    /* We probably need to ask for permissions, so start the intent if there is none pending */
                    if (!mGoogleIntentInProgress) {
                        mGoogleIntentInProgress = true;
                        Intent recover = e.getIntent();
                        startActivityForResult(recover, OAuth.RC_GOOGLE_LOGIN);
                    }
                } catch (GoogleAuthException authEx) {
                    /* The call is not ever expected to succeed assuming you have already verified that
                     * Google Play services is installed. */
                    Log.e(TAG, "Error authenticating with Google: " + authEx.getMessage(), authEx);
                    errorMessage = "Error authenticating with Google: " + authEx.getMessage();
                }

                return token;
            }

            @Override
            protected void onPostExecute(String token) {
                mGoogleLoginClicked = false;
                Intent resultIntent = new Intent();
                if (token != null) {
                    mFirebaseRef.authWithOAuthToken("google", token, new AuthResultHandler("google"));
                } /*else if (errorMessage != null) {
                  //  rmAuthProgressDialog.hide();
                    //showErrorDialog(errorMessage);
                }*/
            }
        };
        task.execute();
    }

我花了几个小时研究和尝试所有关于这个主题的现有主题，但到目前为止没有任何帮助。希望有人能够指出我错过了什么。