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Combination of Facebook and Google auth for Firebase Android

Background

Hi, I am new to Firebase for Android, and I am trying for the first time to implement Facebook authentication and Google / Login. I completed these two tutorials for proper authentication:

  • http://firebase.google.com/docs/auth/android/google-signin
  • http://firebase.google.com/docs/auth/android/facebook-login

Separately, FacebookSignInActivityand GoogleSignInActivitywork as they should.

Problem

The problem is that I'm trying to use Google and Facebook authorization in the same action, but this will not work. For instance:

result layout image

What I've done

I tried to keep FacebookSignInActivityseparate from GoogleSignInActivityby providing them with an extension MainActivityand installing a layout there.

, . , nullpointer:

java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.firebase.auth.FirebaseAuth.addAuthStateListener(com.google.firebase.auth.FirebaseAuth$AuthStateListener)' on a null object reference

, null onCreate, :

 mAuth = FirebaseAuth.getInstance();

 mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    // User is signed in
                    Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
                } else {
                    // User is signed out
                    Log.d(TAG, "onAuthStateChanged:signed_out");
                }
                // [START_EXCLUDE]
                updateUI(user);
                // [END_EXCLUDE]
            }
        };

, . :

, - , . - , .

+4
2

:

public class LoginActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener,
        View.OnClickListener {

    private static final String TAG = "SignInActivity";
    private static final int RC_SIGN_IN = 9001;

    private GoogleApiClient mGoogleApiClient;
    private FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener mAuthListener;

    private CallbackManager mCallbackManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_login);

        // Facebook Login
        FacebookSdk.sdkInitialize(getApplicationContext());
        mCallbackManager = CallbackManager.Factory.create();

        LoginButton mFacebookSignInButton = (LoginButton) findViewById(R.id.facebook_button);
        mFacebookSignInButton.setReadPermissions("email", "public_profile", "user_birthday", "user_friends");

        mFacebookSignInButton.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                Log.d(TAG, "facebook:onSuccess:" + loginResult);
                firebaseAuthWithFacebook(loginResult.getAccessToken());
            }

            @Override
            public void onCancel() {
                Log.d(TAG, "facebook:onCancel");
            }

            @Override
            public void onError(FacebookException error) {
                Log.d(TAG, "facebook:onError", error);
            }
        });

        // Google Sign-In
        // Assign fields
        Button mGoogleSignInButton = (Button) findViewById(R.id.google_button);

        // Set click listeners
        mGoogleSignInButton.setOnClickListener(this);

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

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

        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    // User is signed in
                    Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
                } else {
                    // User is signed out
                    Log.d(TAG, "onAuthStateChanged:signed_out");
                }
            }
        };
    }

    @Override
    public void onStart() {
        super.onStart();
        mAuth.addAuthStateListener(mAuthListener);
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mAuthListener != null) {
            mAuth.removeAuthStateListener(mAuthListener);
        }
    }

    private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
        Log.d(TAG, "firebaseAuthWithGooogle:" + acct.getId());
        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful());

                        // If sign in fails, display a message to the user. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {
                            Log.w(TAG, "signInWithCredential", task.getException());
                            Toast.makeText(LoginActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        } else {
                            startActivity(new Intent(LoginActivity.this, MainActivity.class));
                            finish();
                        }
                    }
                });
    }

    private void firebaseAuthWithFacebook(AccessToken token) {
        Log.d(TAG, "handleFacebookAccessToken:" + token);

        final AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful());

                        // If sign in fails, display a message to the user. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {
                            Log.w(TAG, "signInWithCredential", task.getException());
                            Toast.makeText(LoginActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        } else {
                            startActivity(new Intent(LoginActivity.this, MainActivity.class));
                            finish();
                        }
                    }
                });
    }

 @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.google_button:
                signIn();
                break;
            default:
                return;
        }
    }

    private void signIn() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }
  @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        mCallbackManager.onActivityResult(requestCode, resultCode, data);

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            if (result.isSuccess()) {
                // Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = result.getSignInAccount();
                firebaseAuthWithGoogle(account);
            } else {
                // Google Sign In failed
                Log.e(TAG, "Google Sign In failed.");
            }
        }
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        // An unresolvable error has occurred and Google APIs (including Sign-In) will not
        // be available.
        Log.d(TAG, "onConnectionFailed:" + connectionResult);
        Toast.makeText(this, "Google Play Services error.", Toast.LENGTH_SHORT).show();
    }

}

, , .

+4

, - :

(yourLoginActivity.class)

* int requestCode ActivityForResult

   // You can change to any Value just be unique
   private static final int RC_SIGN_IN = 1001;

- > GoogleApiClient, FirebaseAuth, AuthStateListener CallbackManager

private static final String TAG = "LoginActivity";
private static final int RC_SIGN_IN = 1001;
private GoogleApiClient mGoogleApiClient;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private CallbackManager mCallbackManager;

- > :

 mCallbackManager = CallbackManager.Factory.create();  mAuth = FirebaseAuth.getInstance();  mAuthListener = new FirebaseAuth.AuthStateListener() {
     @Override
     public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
         FirebaseUser user = firebaseAuth.getCurrentUser();
         if (user != null) {
             // User is signed in
             Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
         } else {
             // User is signed out
             Log.d(TAG, "onAuthStateChanged:signed_out");
         }
     }  };

- > SingInButton LoginButton:

  LoginButton facebookLoginButton = findViewById(R.id.login_facebook_button);
  SignInButton mGoogleSignInButton = findViewById(R.id.sign_in_button);

- > SingInButton LoginButton:

 facebookLoginButton.setReadPermissions("email", "public_profile", "user_birthday");
 facebookLoginButton.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() {
     @Override
     public void onSuccess(LoginResult loginResult) {
         firebaseAuthWithFacebook(loginResult.getAccessToken());
     }

     @Override
     public void onCancel() {
         Toast.makeText(LoginActivity.this, "Succes", Toast.LENGTH_SHORT).show();
     }

     @Override
     public void onError(FacebookException error) {
         Toast.makeText(LoginActivity.this, "Succes", Toast.LENGTH_SHORT).show();
     }
 });

 mGoogleSignInButton.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View view) {
         signIn();
     }
 });

- > GoogleSingInOptions GoogleApiClient

GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
        .requestIdToken(getString(R.string.default_web_client_id))
        .requestEmail()
        .build();

mGoogleApiClient = new GoogleApiClient.Builder(this)
        .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
        .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
        .build();

- > Facebook

   private void authWithFacebook(AccessToken token) {
   Log.d(TAG, "handleFacebookAccessToken:" + token);
   final AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
    if (mAuth.getCurrentUser() != null) {
        mAuth.getCurrentUser().linkWithCredential(credential)
                .addOnSuccessListener(new OnSuccessListener<AuthResult>() {
            @Override
            public void onSuccess(AuthResult authResult) {
                Toast.makeText(LoginActivity.this, "Logged IN", Toast.LENGTH_LONG).show();
            }
        })

                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        e.printStackTrace();
                        Log.e(TAG, "onFailure: " + e.getMessage());
                        mAuth.signInWithCredential(credential).addOnSuccessListener(new OnSuccessListener<AuthResult>() {
                            @Override
                            public void onSuccess(AuthResult authResult) {
                                Toast.makeText(LoginActivity.this, "Logged IN", Toast.LENGTH_LONG).show();
                            }
                        });
                    }
                });
    } else {
        mAuth.signInWithCredential(credential);
    }
}

- > Google Login:

  pprivate void authWithGoogle(final GoogleSignInAccount acct) {
    Log.d(TAG, "firebaseAuthWithGooogle:" + acct.getId());
    final AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
    if (mAuth.getCurrentUser() != null) {
        mAuth.getCurrentUser().linkWithCredential(credential).addOnSuccessListener(new OnSuccessListener<AuthResult>() {
            @Override
            public void onSuccess(AuthResult authResult) {
                Toast.makeText(LoginActivity.this, "Logged IN", Toast.LENGTH_LONG).show();
            }
        })

                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        e.printStackTrace();
                        Log.e(TAG, "onFailure: " + e.getMessage());
                        mAuth.signInWithCredential(credential).addOnSuccessListener(new OnSuccessListener<AuthResult>() {
                            @Override
                            public void onSuccess(AuthResult authResult) {
                                Toast.makeText(LoginActivity.this, "Logged IN", Toast.LENGTH_LONG).show();
                            }
                        });
                    }
                });
    }else{
        mAuth.signInWithCredential(credential);
    }
}

- > onConnectionFailed():

 @Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
    // An unresolvable error has occurred and Google APIs (including Sign-In) will not
    // be available.
    Log.d(TAG, "onConnectionFailed:" + connectionResult);
    Toast.makeText(this, "Google Play Services error.", Toast.LENGTH_SHORT).show();
}

- > onActivityForResult()

 private void signIn() {
    Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
    startActivityForResult(signInIntent, RC_SIGN_IN);
}

- > GoogleApiClient.OnConnectionFailedListener

LoginActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener{
....
 }

, ENABLED FACEBOOK SDK. FIREBASE CONSOLE !

0

Source: https://habr.com/ru/post/1656277/

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