Android facebook profile 获取名称

Question

我正在尝试从已登录/已登录的 facebook 用户检索个人资料名称。如果我在运行我的应用程序之前已经在 facebook 上登录，它只会让我检索名称，否则它将是空值。我正在尝试检索名称并将其显示在 textview 对象中。

public class MainFragment extends Fragment {

    private TextView mTextDetails;
    private CallbackManager mCallbackManager;
    private FacebookCallback<LoginResult> mCallback = new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) { // The thing you want to do when you got permission
            AccessToken accessToken = loginResult.getAccessToken();
            Profile profile = Profile.getCurrentProfile();
            if(profile != null){
                mTextDetails.setText("Welcome " + profile.getName());
            }
        }

        @Override
        public void onCancel() {

        }

        @Override
        public void onError(FacebookException error) {

        }
    };

    public MainFragment() {
        // Required empty public constructor
    }

    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(getActivity().getApplicationContext());
        mCallbackManager = CallbackManager.Factory.create();

    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_main, container, false);
        mTextDetails = (TextView)view.findViewById(R.id.text_details);
        LoginButton loginButton = (LoginButton)view.findViewById(R.id.login_button);
        loginButton.setReadPermissions("user_friends");//Only ask if you must
        loginButton.setFragment(this);
        loginButton.registerCallback(mCallbackManager, mCallback);


        return view;
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data){
        super.onActivityResult(requestCode, resultCode, data);
        mCallbackManager.onActivityResult(requestCode,resultCode, data);

    }

}

Answer 1

也许您可以在将读取权限更改为 loginButton.setReadPermissions(Collections.singletonList("pu‌​blic_profile, email")); 后使用 GraphRequest 获取配置文件名称，graphrequest 是

@Override
        public void onSuccess(final LoginResult loginResult) {
            GraphRequest request = GraphRequest.newMeRequest(
                    loginResult.getAccessToken(),
                    new GraphRequest.GraphJSONObjectCallback() {
                        @Override
                        public void onCompleted(
                                JSONObject object,
                                GraphResponse response) {

                            try {
                                if (object != null) {
                                    String name  = object.getString("first_name") + " "+object.getString("last_name");
                                   }
                            } catch (JSONException e) {

                            }
                        }
                    });
            Bundle parameters = new Bundle();
            parameters.putString("fields", "id,name,email, first_name, last_name, gender");
            request.setParameters(parameters);
            request.executeAsync();
        }

Answer 2

您有 Facebook 应用程序密钥吗？ 您需要其中之一才能从您的应用程序访问 Facebook API，这可能解释了为什么除非您登录，否则您无法获得结果，该应用程序需要首先使用应用程序密钥对 Facebook API 进行身份验证。

Link to Tutorial on how to get your key