android - 无法使用适用于 Android 的 Facebook SDK 在 Facebook 上发布

Question

我正在使用 com.facebook.widget.UserSettingsFragment 来管理登录/注销:

Fragment userSettingsFragment = new UserSettingsFragment();
fragmentTransaction.replace(R.id.content_container, userSettingsFragment, "userSettingsFragment");

然后在另一个 Fragment 中，我想在 Facebook 上发布一条消息。我检查了doc并编写如下所示的 MyFragment。

与 com.facebook.widget.UserSettingsFragment 的连接似乎有效(我可以登录/注销)，但是当我想在 MyFragment 中发布时，似乎session.requestNewPublishPermissions(newPermissionsRequest); 不会更改 Session，因为永远不会调用 onSessionStateChange。

它调用一些 Facebook UI 来请求许可，然后什么也没有发生。

我能否只使用 com.facebook.widget.UserSettingsFragment 进行登录/注销，即它是否管理所有 Facebook SDK 对象？我想知道，因为 MyFragment 中的 Session.getActiveSession(); 总是返回一个 Session，即使我已注销也是如此。

有人可以帮忙吗？

public class MyFragment extends Fragment{

    private Button mBtnShare;

    private UiLifecycleHelper mUiHelper;

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

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

    private void onSessionStateChange(Session session, SessionState state, Exception exception) {
        if (state.isOpened()) {
            if (pendingPublishReauthorization && 
                    state.equals(SessionState.OPENED_TOKEN_UPDATED)) {
                pendingPublishReauthorization = false;
                publish();
            }
        } else if (state.isClosed()) {
        }
    }   

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

        if (savedInstanceState != null) {
            pendingPublishReauthorization = 
                savedInstanceState.getBoolean(PENDING_PUBLISH_KEY, false);
        }

        return inflater.inflate(R.layout.my_fragment, container, false);
    }

    @Override
    public void onActivityCreated (Bundle savedInstanceState){

        super.onActivityCreated(savedInstanceState);

        mBtnShare = (Button) getActivity().findViewById(R.id.btn_share);
        mBtnShare.setOnClickListener( new Button.OnClickListener() {  
            public void onClick(View v)
            {
               publish();
            }

        );
    }   


    @Override
    public void onCreate (Bundle savedInstanceState){

        super.onCreate(savedInstanceState);

        mUiHelper = new UiLifecycleHelper(getActivity(), mCallback);
        mUiHelper.onCreate(savedInstanceState);
    }

    @Override
    public void onResume() {     
        super.onResume();
        mUiHelper.onResume();
    }

    @Override
    public void onPause() {
        mUiHelper.onPause();
        super.onPause();
    }   

    @Override
    public void onDestroy() {
        super.onDestroy();
        mUiHelper.onDestroy();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putBoolean(PENDING_PUBLISH_KEY, pendingPublishReauthorization);
        mUiHelper.onSaveInstanceState(outState);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent) {

        super.onActivityResult(requestCode, resultCode, intent);
        mUiHelper.onActivityResult(requestCode, resultCode, intent);
    }   

    private void publish() {

        Session session = Session.getActiveSession();

        if (session != null){

            // Check for publish permissions    
            List<String> permissions = session.getPermissions();
            if (!isSubsetOf(PERMISSIONS, permissions)) {
                pendingPublishReauthorization = true;
                Session.NewPermissionsRequest newPermissionsRequest = new Session
                        .NewPermissionsRequest(this, PERMISSIONS);
                session.requestNewPublishPermissions(newPermissionsRequest);
                return;
            }

            Bundle postParams = new Bundle();
            postParams.putString("name", "Facebook SDK for Android");
            postParams.putString("caption", "Build great social apps and get more installs.");
            postParams.putString("description", "The Facebook SDK for Android makes it easier and faster to develop Facebook integrated Android apps.");
            postParams.putString("link", "https://developers.facebook.com/android");
            postParams.putString("picture", "https://raw.github.com/fbsamples/ios-3.x-howtos/master/Images/iossdk_logo.png");

            Request.Callback callback= new Request.Callback() {
                public void onCompleted(Response response) {
                    JSONObject graphResponse = response
                            .getGraphObject()
                            .getInnerJSONObject();
                    String postId = null;
                    try {
                        postId = graphResponse.getString("id");
                    } catch (JSONException e) {
                        Log.i(this.getClass().getSimpleName(), "JSON error "+ e.getMessage(), MyApplication.LOG_LEVEL);
                    }
                    FacebookRequestError error = response.getError();
                    if (error != null) {
                        Toast.makeText(getActivity()
                                .getApplicationContext(),
                                error.getErrorMessage(),
                                Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(getActivity()
                                .getApplicationContext(), 
                                postId,
                                Toast.LENGTH_LONG).show();
                    }
                }
            };

            Request request = new Request(session, "me/feed", postParams, 
                    HttpMethod.POST, callback);

            RequestAsyncTask task = new RequestAsyncTask(request);
            task.execute();
        }

    }

    private boolean isSubsetOf(Collection<String> subset, Collection<String> superset) {
        for (String string : subset) {
            if (!superset.contains(string)) {
                return false;
            }
        }
        return true;
    }
}

Answer 1

我没有像示例代码那样检查每个请求的权限，而是直接在 com.facebook.widget.UserSettingsFragment 中设置:

UserSettingsFragment userSettingsFragment = new UserSettingsFragment();                 
Session session = Session.getActiveSession();
if(session==null || session.isClosed()){
    userSettingsFragment.setPublishPermissions(Arrays.asList("publish_actions"));
}
fragmentTransaction.replace(R.id.content_container, userSettingsFragment, "userSettingsFragment");