Android FB logInWithReadPermissions 和 registerCallback 没有登录按钮

Question

为此而生气。我尝试登录 FB，同时检索用户信息。

FB 登录工作正常，应用程序更改为 FB，显示应用程序请求的权限，然后在按接受后返回到我的应用程序。但是 registerCallback 永远不会被调用。我的错误在哪里？这是我的代码:

        FacebookSdk.sdkInitialize(getApplicationContext());
        CallbackManager mCallbackManager = CallbackManager.Factory.create();
        LoginManager.getInstance().logInWithReadPermissions(
                this,
                permissionNeeds);

        LoginManager.getInstance().registerCallback(mCallbackManager,
                new FacebookCallback<LoginResult>() {
                    @Override
                    public void onSuccess(LoginResult loginResult) {
                        Log.e("dd", "SUCCESS");

                        GraphRequest.newMeRequest( loginResult.getAccessToken(), new GraphRequest.GraphJSONObjectCallback() {

                                    @Override
                                   public void onCompleted(JSONObject json, GraphResponse response) {
                                        if (response.getError() != null) {
                                            System.out.println("ERROR");
                                        } else {
                                            System.out.println("Success");
                                            try {
                                                String jsonresult = String.valueOf(json);
                                                System.out.println("JSON Result" + jsonresult);
                                                String str_email = json.getString("email");
                                                String str_id = json.getString("id");
                                                String str_firstname = json.getString("first_name");
                                                String str_lastname = json.getString("last_name");
                                            } catch (JSONException e) {
                                                e.printStackTrace();
                                            }
                                        }
                                    }
                                }).executeAsync();
                    }

                    @Override
                    public void onCancel() {

                        Log.e("dd", "facebook login canceled");

                    }


                    @Override
                    public void onError(FacebookException e) {


                        Log.e("dd", "facebook login failed error");

                    }
                });

Answer 1

编辑:

找到了，下面的代码少了，现在是获取登录后的用户信息

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);
    mCallbackManager.onActivityResult(requestCode, resultCode, data);
}