如何获取登录用户'；Facebook Android sdk 4.0中带有图形请求的s电子邮件地址

我试图在用户使用Facebook（sdk 4.0）登录到我的Android应用程序后获取他的电子邮件地址。我读过很多帖子问同样的问题，但我还是没能做到。我只是用代码让用户登录

LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("public_profile", "user_friends", "email"));

然后，我使用

LoginManager.getInstance().registerCallback(fbCallbackManager,
            new FacebookCallback<LoginResult>() {
                @Override
                public void onSuccess(LoginResult loginResult) {
                    System.out.println(loginResult.getAccessToken().toString());

                    GraphRequest request = GraphRequest.newMeRequest(
                            loginResult.getAccessToken(),
                            new GraphRequest.GraphJSONObjectCallback() {
                                @Override
                                public void onCompleted(
                                        JSONObject object,
                                        GraphResponse response) {
                                    System.out.println(object.toString());

                                }
                            });
                    Bundle parameters = new Bundle();
                    parameters.putString("fields", "email");
                    request.setParameters(parameters);
                    request.executeAsync();
                }

                @Override
                public void onCancel() {
                    // App code
                }

                @Override
                public void onError(FacebookException exception) {
                    // App code
                }
            });

---

即使我删除了“字段”部分，我也会得到一个JSON，其中包含一堆用户的公共信息，但从来没有包含电子邮件字段。我正在我自己的Facebook帐户上测试这一点，我确实有一个相关的电子邮件地址。

您可以按如下方式获得登录的用户电子邮件，但请注意

他们不保证你会得到一个电子邮件地址

在某些情况下，虽然用户提供了电子邮件，但如果电子邮件无效，它将不会通过请求发送

@Override
public void onSuccess(LoginResult loginResult) {


GraphRequest request = GraphRequest.newMeRequest( AccessToken.getCurrentAccessToken(),
        new GraphRequest.GraphJSONObjectCallback() {
            @Override
            public void onCompleted(JSONObject object,GraphResponse response) {
            try {
                String  email=object.getString("email");
                Log.d(TAG + "user email ", email);
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }

            });

            request.executeAsync();                        
 }

---

下面是完整的代码，通过它我可以从facebook获得我们需要的所有数据

 login_facebook_button = (LoginButton) findViewById(R.id.login_facebook_button);
    login_facebook_button.setReadPermissions(Arrays.asList("public_profile", "user_friends", "email", "user_birthday"));
    //LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("public_profile", "user_friends"));
    // Callback registration
    login_facebook_button.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            // App code
            Log.e("onSuccess", "--------" + loginResult.getAccessToken());
            Log.e("Token", "--------" + loginResult.getAccessToken().getToken());
            Log.e("Permision", "--------" + loginResult.getRecentlyGrantedPermissions());
            Profile profile = Profile.getCurrentProfile();
            Log.e("ProfileDataNameF", "--" + profile.getFirstName());
            Log.e("ProfileDataNameL", "--" + profile.getLastName());

            Log.e("Image URI", "--" + profile.getLinkUri());

            Log.e("OnGraph", "------------------------");
            GraphRequest request = GraphRequest.newMeRequest(
                    loginResult.getAccessToken(),
                    new GraphRequest.GraphJSONObjectCallback() {
                        @Override
                        public void onCompleted(
                                JSONObject object,
                                GraphResponse response) {
                            // Application code
                            Log.e("GraphResponse", "-------------" + response.toString());
                        }
                    });
            Bundle parameters = new Bundle();
            parameters.putString("fields", "id,name,link,gender,birthday,email");
            request.setParameters(parameters);
            request.executeAsync();

        }

        @Override
        public void onCancel() {
            // App code
        }

        @Override
        public void onError(FacebookException exception) {
            // App code
        }
    });

希望这对你有帮助

---

“contact_email”是电子邮件权限，当我将它添加到我的邮件中时，我缺少了它

你找到问题的答案了吗？如果是的话，请把它作为一个答案贴在这里。事实上，你问题中的代码对我来说比下面的所有答案都有效，谢谢manThanks，这是对我来说唯一有效的解决方案。谢谢你，伙计。。它也帮助了我：）在这里查看所有参数

 login_facebook_button = (LoginButton) findViewById(R.id.login_facebook_button);
    login_facebook_button.setReadPermissions(Arrays.asList("public_profile", "user_friends", "email", "user_birthday"));
    //LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("public_profile", "user_friends"));
    // Callback registration
    login_facebook_button.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            // App code
            Log.e("onSuccess", "--------" + loginResult.getAccessToken());
            Log.e("Token", "--------" + loginResult.getAccessToken().getToken());
            Log.e("Permision", "--------" + loginResult.getRecentlyGrantedPermissions());
            Profile profile = Profile.getCurrentProfile();
            Log.e("ProfileDataNameF", "--" + profile.getFirstName());
            Log.e("ProfileDataNameL", "--" + profile.getLastName());

            Log.e("Image URI", "--" + profile.getLinkUri());

            Log.e("OnGraph", "------------------------");
            GraphRequest request = GraphRequest.newMeRequest(
                    loginResult.getAccessToken(),
                    new GraphRequest.GraphJSONObjectCallback() {
                        @Override
                        public void onCompleted(
                                JSONObject object,
                                GraphResponse response) {
                            // Application code
                            Log.e("GraphResponse", "-------------" + response.toString());
                        }
                    });
            Bundle parameters = new Bundle();
            parameters.putString("fields", "id,name,link,gender,birthday,email");
            request.setParameters(parameters);
            request.executeAsync();

        }

        @Override
        public void onCancel() {
            // App code
        }

        @Override
        public void onError(FacebookException exception) {
            // App code
        }
    });

{Response:  responseCode: 200, graphObject: {"id":"896337040431723","name":"Aneh Thakur","link":"https:\/\/www.facebook.com\/app_scoped_user_id\/896337040431723\/","gender":"male","birthday":"08\/05\/1992","email":"anehkumar@gmail.com"}, error: null}

fbLoginButton.setReadPermissions("public_profile", "user_friends", "user_photos", "email", "user_birthday", "public_profile", "contact_email");