Android Firebase Oauth Facebook 无法在 fragment 中工作

Question

无法使用 Firebase Facebook 进行身份验证，这是我的 fragment 代码:

public class LoginFragment extends Fragment {

private View mView;

private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private CallbackManager mCallbackManager;

public LoginFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    mView = inflater.inflate(R.layout.fragment_login, container, false);
    loginFacebook();
    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");
            }
            // ...
        }
    };

    return mView;
}


private void loginFacebook() {
    // Initialize Facebook Login button
    mCallbackManager = CallbackManager.Factory.create();
    LoginButton loginButton = (LoginButton) mView.findViewById(R.id.login_button);
    loginButton.setReadPermissions("email", "public_profile");
    loginButton.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            //Log.d(TAG, "facebook:onSuccess:" + loginResult);
            handleFacebookAccessToken(loginResult.getAccessToken());
        }

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

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


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    // Pass the activity result back to the Facebook SDK
    mCallbackManager.onActivityResult(requestCode, resultCode, data);
}

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

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

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

    AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
    mAuth.signInWithCredential(credential)
            .addOnCompleteListener((MainActivity)getActivity(), 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((MainActivity)getActivity(), "Authentication failed.",
                                Toast.LENGTH_SHORT).show();
                    }


                }
            });
}
}

在 Facebook 弹出窗口出现并输入我的用户名和密码后，在 Debug模式下代码中没有任何内容被触发。

Firebase 用户始终为 null。我究竟做错了什么 ？登录后记录 Log.d("LOGGER", "onAuthStateChanged:signed_out");

PS:完全相同的代码在插入 MainActivity

时有效

Answer 1

您可以尝试将 fragment 链接到登录按钮。

loginButton.setFragment(this);