解析Facebook登录

Question

我无法为使用facebook登录的用户解析自定义数据以解析用户表。以下代码段无法执行

public void onCompleted(JSONObject fbUser, GraphResponse graphResponse)      {                                           
    Log.d(TAG, "Facebook Request onCompleted()");
    try {                                           
    String email = fbUser.get("email").toString();
    String name = fbUser.get("name").toString();
    ParseUser parseUser=ParseUser.getCurrentUser();
    Log.d(TAG," "+parseUser.get("username") );
    parseUser.put("email", email);
    parseUser.put("name", name);
    parseUser.saveInBackground();
         } catch (JSONException e1) {
            e1.printStackTrace();}
}