多个身份验证提供程序 Android Firebase

Question

I have LoginActivity with Email/password login, facebook, google authentication. It works separately but if I create account with google, I can't login with facebook.

Login activity code:

public class LoginActivity extends AppCompatActivity {

    private Button mLogin,mRegister;
    private int RC_SIGN_IN =0;
    private EditText mEmail, mPassword;
    public FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener firebaseAuthStateListener;
    CallbackManager callbackManager;
    private LoginButton loginButton;
    private static final String EMAIL = "email";
    private TextView facebookRegister;
    private SignInButton googleSignIn;
    GoogleSignInClient mGoogleSignInClient;
    @Override
        protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        Intent intent  = new Intent(LoginActivity.this, LoginTest.class);
        startActivity(intent);
        //FACEBOOK
        mAuth = FirebaseAuth.getInstance();
        FacebookSdk.sdkInitialize(getApplicationContext());
        AppEventsLogger.activateApp(getApplication());
        callbackManager = CallbackManager.Factory.create();

        // Configure sign-in to request the user's ID, email address, and basic
        // profile. ID and basic profile are included in DEFAULT_SIGN_IN.
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();
        // Build a GoogleSignInClient with the options specified by gso.
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
        googleSignIn = findViewById(R.id.sign_in_button);
        googleSignIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (v.getId()) {
                    case R.id.sign_in_button:
                        signIn();
                        break;
                    // ...
                }
            }
        });

        firebaseAuthStateListener= new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
                if(user !=null){
                    Intent intent  = new Intent(LoginActivity.this, MainActivity.class);
                    startActivity(intent);
                    finish();
                    return;
                }
            }
        };


        loginButton = findViewById(R.id.login_button);
        loginButton.setReadPermissions(Arrays.asList(EMAIL));
        mLogin = (Button) findViewById(R.id.login);
        mEmail = (EditText) findViewById(R.id.email);
        mPassword=(EditText) findViewById(R.id.password);
        mRegister=(Button)findViewById(R.id.register);



        // Callback registration
        loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                // App code
                handleFacebookToken(loginResult.getAccessToken());
                   //fill database
            }

            @Override
            public void onCancel() {
                // App code
            }

            @Override
            public void onError(FacebookException exception) {
                // App code
            }
        });

        mLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                logInEmailPassword();

            }
        });

        mRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent  = new Intent(LoginActivity.this, RegistrationActivity.class);
                startActivity(intent);
                finish();
                return;
            }
        });




    }


    @Override
    protected void onStart() {
        super.onStart();
        GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);
        mAuth.addAuthStateListener(firebaseAuthStateListener);

    }

    @Override
    protected void onStop() {
        super.onStop();
        mAuth.removeAuthStateListener(firebaseAuthStateListener);
    }



    private void logInEmailPassword() {
        String email = mEmail.getText().toString();
        String password = mPassword.getText().toString();
        if(email.isEmpty()){
            Toast.makeText(LoginActivity.this, "Wrong email", Toast.LENGTH_SHORT).show();
            mEmail.setError("Enter email!");
        };
        if(password.isEmpty()){
            mPassword.setError("Enter password!");
            Toast.makeText(LoginActivity.this, "Wrong password", Toast.LENGTH_SHORT).show();
        }
        if(!email.isEmpty() && !password.isEmpty()){
            AuthCredential credential = EmailAuthProvider.getCredential(email, password);
            linkWithCredential(credential);
        }
    }

    private void handleFacebookToken(AccessToken token) {

        AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        linkWithCredential(credential);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);
        callbackManager.onActivityResult(requestCode, resultCode, data);
        // Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            // The Task returned from this call is always completed, no need to attach
            // a listener.
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            handleSignInResult(task);
        }
    }
    private void signIn() {
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }

    private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
        try {
            GoogleSignInAccount account = completedTask.getResult(ApiException.class);
            FirebaseGoogleAuth(account);
            // Signed in successfully, show authenticated UI.

        } catch (ApiException e) {
            // The ApiException status code indicates the detailed failure reason.
            // Please refer to the GoogleSignInStatusCodes class reference for more information.
            Log.w("myLog", "signInResult:failed code=" + e.getStatusCode());;
        }
    }

    private void FirebaseGoogleAuth(GoogleSignInAccount account) {
        AuthCredential authCredential = GoogleAuthProvider.getCredential(account.getIdToken(),null);
        linkWithCredential(authCredential);
        }
    private void linkWithCredential(AuthCredential credential){

        mAuth = FirebaseAuth.getInstance()
        //mAuth.getCurrentUser().linkWithCredential(credential)
             mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            Log.d("myLog", "linkWithCredential:success");
                            FirebaseUser user = task.getResult().getUser();
                            updateUI(user);
                        } else {
                            Log.w("myLog", "linkWithCredential:failure", task.getException());
                            Toast.makeText(LoginActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                            LoginManager.getInstance().logOut();
                            updateUI(null);
                        }

                        // ...
                    }
                });
    }

    }

I've followed https://firebase.google.com/docs/auth/android/account-linking?authuser=0 tutorial but I stuck at linkWithCredential. Can you help me fix that issue? Thanks

Answer 1

The problem if that user exists in Firebase Authentication already and is assigned to GoogleAuth i cant login with Facebook. It works vice versa, if facebook user exists in firebase and i login with google it overrides that user.

Register ---- logout ---- login
Google --->>>>>>>>>>>>>>>>Facebook >>>>dont work
Facebook--->>>>>>>>>>>>>>>Google >>>>> works