Android Firebase Oauth Facebook 无法在片段中工作

Question

使用 Firebase Facebook 进行身份验证不起作用，这是我的片段代码：

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，在调试模式下代码中没有任何内容。

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

时会起作用

Answer 1

您可以尝试将片段链接到登录按钮。

loginButton.setFragment(this);

Answer 2

所以经过一些研究，我现在知道我应该使用 Activity 进行登录操作，而不是片段。

但是我在让代码在 MainActivity 中工作时遇到了问题，实际上一切都“工作”了。我登录了，但我的 FirebaseAuth.AuthStateListener 没有从 firebaseAuth.getCurrentUser() 返回任何用户。

所以经过几个小时的测试后，我发现在登录方法中启用电子邮件/密码可以让它工作。奇怪……

至少我认为这是问题所在，但我确实创建了一个新的 Android 项目。并使用：Tools -> firebase 生成一个 firebase 项目。但我记得这并没有解决问题，至少没有立即解决。

也可能是模拟器的原因。

Answer 3

我只是从我的自定义按钮中调用 facebook 默认按钮，并将每一行代码都保留为记录并成功运行。

public class SignInFragment extends Fragment implements
> FragmentChangeListener{
>     private Button facebook;

private FirebaseAuth firebaseAuth;
private CallbackManager mCallBackManager;
private LoginButton loginButton;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    // Inflate the layout for this fragment
    View view =  inflater.inflate(R.layout.fragment_sign_in, container, false);

    facebook = view.findViewById(R.id.facebookButton);
    loginButton = view.findViewById(R.id.facebookBtn);

    firebaseAuth = FirebaseAuth.getInstance();

    facebook.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            loginButton.callOnClick();
        }
    });

    loginButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mCallBackManager = CallbackManager.Factory.create();
            loginButton.setFragment(SignInFragment.this);
            loginButton.setPermissions("email","public_profile");
            loginButton.registerCallback(mCallBackManager, new FacebookCallback<LoginResult>() {
                @Override
                public void onSuccess(LoginResult loginResult) {
                    handleFacebookAccessToken(loginResult.getAccessToken());
                }

                @Override
                public void onCancel() {
                    Toast.makeText(getContext(),"Is Cancelled",Toast.LENGTH_LONG).show();
                }

                @Override
                public void onError(FacebookException error) {
                    Toast.makeText(getContext(),error.getMessage(),Toast.LENGTH_LONG).show();
                }
            });
        }
    });

    return view;
}


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

    mCallBackManager.onActivityResult(requestCode, resultCode, data);

}

private void handleFacebookAccessToken(AccessToken token) {
    AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
    firebaseAuth.signInWithCredential(credential)
            .addOnCompleteListener(getActivity(), new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if (task.isSuccessful()) {
                        // Sign in success, update UI with the signed-in user's information
                        FirebaseUser user = firebaseAuth.getCurrentUser();
                        startActivity(new Intent(getContext(),MainActivity.class));
                    } else {
                        // If sign in fails, display a message to the user.
                        Toast.makeText(getContext(), task.getException().getMessage(),
                                Toast.LENGTH_SHORT).show();
                    }

                }
            });
}

}