android - FB sdk, requestNewPublishPermissions() 不调用任何回调

Question

我关注了 FB tutorial一步一步来，我不明白为什么这不起作用。

我所有的 fragment 都继承自 BaseFragment :

public class BaseFragment extends SherlockFragment {
    ...
    protected UiLifecycleHelper _uiHelper;
    protected boolean _isResumed = false;

    protected static final List<String> PERMISSIONS = Arrays.asList("publish_actions");
    protected static final String PENDING_PUBLISH_KEY = "pendingPublishReauthorization";
    protected boolean _pendingPublishReauthorization = false;


    protected Session.StatusCallback _callback = new Session.StatusCallback() {
        @Override
        public void call(Session session, SessionState state, Exception exception) {
            onSessionStateChange(session, state, exception);
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        _uiHelper = new UiLifecycleHelper(getSherlockActivity(), _callback);
        _uiHelper.onCreate(savedInstanceState);
    }

    protected void onSessionStateChange(Session session, SessionState state, Exception exception) {}

    ...(all lifecycle stuff)
}

然后我有一个包含登录/注销按钮的 FacebookLoginFragment:

public class FacebookLoginFragment extends BaseFragment {

    protected LoginButton _authButton;
    protected ProgressBar _loadingBar;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.facebook_login, container, false);

        _loadingBar = (ProgressBar) view.findViewById(R.id.login_progressBar);

        _authButton = (LoginButton) view.findViewById(R.id.authFacebookButton);
        _authButton.setFragment(this);
        _authButton.setReadPermissions(Arrays.asList("email", "user_birthday"));

        return view;
    }

    @Override
    protected void onSessionStateChange(Session session, SessionState state, Exception exception) {
        super.onSessionStateChange(session, state, exception);

        // LogIn process
    }
    ...
}

最后，我有一个 NewsFragment，其中包含提要的 ListView 。每个提要都是可共享的。当我们单击提要的共享按钮时，适配器会调用 NewsFragment.publishFeed(feed) 方法。

public class NewsFragment extends BaseFragment{
    ...
    protected Feed _feedPendingPublish;

    @Override
    // => NEVER CALLED 
    protected void onSessionStateChange(Session session, SessionState state, Exception exception) {
        super.onSessionStateChange(session, state, exception);

        if (_isResumed) {

            if (_pendingPublishReauthorization && state.equals(SessionState.OPENED_TOKEN_UPDATED)) {
                _pendingPublishReauthorization = false;
                if(_feedPendingPublish != null){
                    publishFeed(_feedPendingPublish);
                    _feedPendingPublish = null;
                }
            }
        }
    }

    public void publishFeed(Feed feed){

        if(_pendingPublishReauthorization){
            return;
        }

        Session session = Session.getActiveSession();

        if (session != null){

            // If permission doesn't exist, ask and return. Otherwise, send request

            List<String> permissions = session.getPermissions();
            if (!isSubsetOf(PERMISSIONS, permissions)) {
                _pendingPublishReauthorization = true;
                _feedPendingPublish = feed;

                Session.NewPermissionsRequest newPermissionsRequest = new Session
                    .NewPermissionsRequest(getSherlockActivity(), PERMISSIONS);
                session.requestNewPublishPermissions(newPermissionsRequest);

                return;
            }

            // DO stuff
        }
    }
}

问题是发布授权后没有调用 NewsFragment 回调。 (既不是 BaseFragment，也不是 FacebookLogin)。请注意，这两个 fragment 都存在于同一 Activity 中。

我正在使用 facebook-android-sdk-3.5.2

Answer 1

我终于明白了。正如很多人所说，这是一个 onActivityResult() 的问题，但相当恶毒。

登录时，成功调用了 FacebookLoginFragment.onSessionStateChange()，而在权限过程中从未调用过 NewsFragment.onSessionStateChange()。

经过几次测试，我认为这是由于静态和动态绑定(bind)造成的。我的 FacebookLoginfragment 在 xml 中直接引用(静态)，而我的 NewsFragment 是在源代码中动态添加的。因此，包含两个 fragment 的 Activity 仅将 onActivityResult 信号发送到 FacebookLoginFragment。因此，从未调用触发回调所需的 NewsFragment.onActivityResult()。

重写 Activity.onActivityResult() 给我预期的行为:

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    getSupportFragmentManager().findFragmentById(R.id.my_fragment_frame).onActivityResult(requestCode, resultCode, data);
}