何时使用Facebook的新Android SDK 3.0请求权限？

Question

随着Facebook的新Android SDK 3.0(几天前发布),身份验证过程发生了变化.

那么你如何申请阅读权限,例如"friends_hometown"？

以下代码是我试图这样做的 - 但我很确定这不是你应该这样做的方式:

版本1:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Session.openActiveSession(this, true, new Session.StatusCallback() { // start Facebook login
        @Override
        public void call(Session session, SessionState state, Exception exception) { // callback for session state changes
            if (session.isOpened()) {
                List<String> permissions = new ArrayList<String>();
                permissions.add("friends_hometown");
                session.requestNewReadPermissions(new Session.NewPermissionsRequest(FBImport.this, permissions));
                Request.executeGraphPathRequestAsync(session, "me/friends/?access_token="+session.getAccessToken()+"&fields=id,name,hometown", new Request.Callback() {
                    ...
                });
            }
        }
    });
}

版本2:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Session currentSession = Session.getActiveSession();
    if (currentSession == null || currentSession.getState().isClosed()) {
        Session session = Session.openActiveSession(this, true, fbStatusCallback); // PROBLEM: NO PERMISSIONS YET BUT CALLBACK IS EXECUTED ON OPEN
        currentSession = session;
    }
    if (currentSession != null && !currentSession.isOpened()) {
        OpenRequest openRequest = new OpenRequest(this).setCallback(fbStatusCallback); // HERE IT IS OKAY TO EXECUTE THE CALLBACK BECAUSE WE'VE GOT THE PERMISSIONS
        if (openRequest != null) {
            openRequest.setDefaultAudience(SessionDefaultAudience.FRIENDS);
            openRequest.setPermissions(Arrays.asList("friends_hometown"));
            openRequest.setLoginBehavior(SessionLoginBehavior.SSO_WITH_FALLBACK);
            currentSession.openForRead(openRequest);
        }
    }
}

我正在做的是在会话打开后立即请求权限 - 但此时代码已经启动了一个Graph API请求,因此权限请求来得很晚......

您无法在初始化会话的同时申请权限吗？

Answer 1

我能够让它发挥作用.它是对第2版示例的修改.Jesse提供的链接也有所帮助.

以下是我在验证用户时运行的代码:

private void signInWithFacebook() {

    mSessionTracker = new SessionTracker(getBaseContext(), new StatusCallback() {

        @Override
        public void call(Session session, SessionState state, Exception exception) {
        }
    }, null, false);

    String applicationId = Utility.getMetadataApplicationId(getBaseContext());
    mCurrentSession = mSessionTracker.getSession();

    if (mCurrentSession == null || mCurrentSession.getState().isClosed()) {
        mSessionTracker.setSession(null);
        Session session = new Session.Builder(getBaseContext()).setApplicationId(applicationId).build();
        Session.setActiveSession(session);
        mCurrentSession = session;
    }

    if (!mCurrentSession.isOpened()) {
        Session.OpenRequest openRequest = null;
        openRequest = new Session.OpenRequest(SignUpChoices.this);

        if (openRequest != null) {
            openRequest.setDefaultAudience(SessionDefaultAudience.FRIENDS);
            openRequest.setPermissions(Arrays.asList("user_birthday", "email", "user_location"));
            openRequest.setLoginBehavior(SessionLoginBehavior.SSO_WITH_FALLBACK);

            mCurrentSession.openForRead(openRequest);
        }
    }else {
        Request.executeMeRequestAsync(mCurrentSession, new Request.GraphUserCallback() {
              @Override
              public void onCompleted(GraphUser user, Response response) {
                  Log.w("myConsultant", user.getId() + " " + user.getName() + " " + user.getInnerJSONObject());
              }
            });
    }
}

为了测试我从Facebooks身份验证返回后通过以下代码运行它:

public void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);

  if (mCurrentSession.isOpened()) {
    Request.executeMeRequestAsync(mCurrentSession, new Request.GraphUserCallback() {

          // callback after Graph API response with user object
          @Override
          public void onCompleted(GraphUser user, Response response) {
              Log.w("myConsultant", user.getId() + " " + user.getName() + " " + user.getInnerJSONObject());
          }
        });
    }
}

Answer 2

我通过实现自己的Session.openActiveSession()方法解决了同样的问题:

private static Session openActiveSession(Activity activity, boolean allowLoginUI, StatusCallback callback, List<String> permissions) {
    OpenRequest openRequest = new OpenRequest(activity).setPermissions(permissions).setCallback(callback);
    Session session = new Builder(activity).build();
    if (SessionState.CREATED_TOKEN_LOADED.equals(session.getState()) || allowLoginUI) {
        Session.setActiveSession(session);
        session.openForRead(openRequest);
        return session;
    }
    return null;
}

Answer 3

我建议您阅读我们的登录教程这里具体步骤3.使用登录按钮,我们提供的是最方便的方法,(见authButton.setReadPermissions())

编辑:

在不使用loginbutton的情况下设置权限比较棘手,因为您必须手动完成所有会话管理.深入研究登录按钮的源代码,这行代码可能就是您所需要的.您似乎需要创建自己Session.OpenRequest的属性并设置其属性,例如权限,受众和登录行为,然后获取当前会话并调用openForRead()您的Session.OpenRequest.