在使用SDK 4.0的Android中登录成功后，我需要用户的电子邮件地址 [英] I need user's email address after successful facebook login in android using SDK 4.0

问题描述

我已经整合了最新的Facebook android sdk 4.0。在成功登录后，SDK 3.0+用户的电子邮件地址将使用user.getProperty（email）进行存储。我正在寻找相应的命令在Facebook Android sdk 4.0
参考链接：

https://developers.facebook.com/docs/facebook-login/android/v2.3#overview
< a href =https://developers.facebook.com/docs/android/upgrading-4.x =noreferrer> https://developers.facebook.com/docs/android/upgrading-4.x

  @Override 
 public void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState ）; 
 FacebookSdk.sdkInitialize（getActivity（）。getApplicationContext（））; 
 callbackManager = CallbackManager.Factory.create（）; 
} 
 
 @Override 
 public void onViewCreated（View view，@Nullable Bundle savedInstanceState）{
 super.onViewCreated（view，savedInstanceState）; 
 loginButton =（LoginButton）view.findViewById（R.id.login_button）; 
 loginButton.setReadPermissions（email，user_likes，user_friends）; 
 loginButton.setFragment（this）; 
 setFacebookLoginText（loginButton）; 
 //其他应用程序特定专门化
 
 //回调注册
 loginButton.registerCallback（callbackManager，new FacebookCallback< LoginResult>（）{
 @Override 
 public void onSuccess（LoginResult loginResult）{
 AccessToken accessToken = loginResult.getAccessToken（）; 
 GraphRequest request = GraphRequest.newMeRequest（accessToken，new GraphRequest.GraphJSONObjectCallback（）{
 @Override 
 public void onCompleted（JSONObject user，GraphResponse graphResponse）{
 
 //登录成功后需要用户电子邮件地址
 
} 
}）executeAsync（）; 
 
 
 @Override 
 public void onCancel（）{
 Toast.makeText（getActivity（），fail，Toast.LENGTH_SHORT）.show（）; 
} 
 
 @Override 
 public void onError（FacebookException exceptio n）{
 Toast.makeText（getActivity（），error，Toast.LENGTH_SHORT）.show（）; 
} 
}）; 
 
} 
 
 @Override 
 public View onCreateView（LayoutInflater inflater，ViewGroup容器，Bundle savedInstanceState）{
查看视图= inflater.inflate（R。 layout.fragment_facebook_login，container，false）; 
返回视图; 
} 
 
 
 @Override 
 public void onActivityResult（int requestCode，int resultCode，Intent data）{
 super.onActivityResult（requestCode，resultCode，data ）; 
 callbackManager.onActivityResult（requestCode，resultCode，data）; 
} 
  

解决方案

只需要在FacebookCallBack的onSuccess方法中将GraphRequest更改为GraphRequestAsyncTask，然后可以轻松地从JSONObject中获取用户详细信息。

  @Override 
 public void onSuccess（LoginResult loginResult）{
 final AccessToken accessToken = loginResult.getAccessToken（）; 
 final FBUser fbUser = new FBUser（）; 
 GraphRequestAsyncTask request = GraphRequest.newMeRequest（accessToken，new GraphRequest.GraphJSONObjectCallback（）{
 @Override 
 public void onCompleted（JSONObject user，GraphResponse graphResponse）{
 fbUser.setEmail .optString（email））; 
 fbUser.setName（user.optString（name））; 
 fbUser.setId（user.optString（id））; 
} 
}）。executeAsync（）; 
} 
  

I have integrated latest Facebook android sdk 4.0. In SDK 3.0+ user's email address is retreived using user.getProperty("email") after successful login. I am looking for corresponding command in Facebook Android sdk 4.0 Reference Links:

https://developers.facebook.com/docs/facebook-login/android/v2.3#overview https://developers.facebook.com/docs/android/upgrading-4.x

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FacebookSdk.sdkInitialize(getActivity().getApplicationContext());
    callbackManager = CallbackManager.Factory.create();
}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    loginButton = (LoginButton) view.findViewById(R.id.login_button);
    loginButton.setReadPermissions("email", "user_likes", "user_friends");
    loginButton.setFragment(this);
    setFacebookLoginText(loginButton);
    // Other app specific specialization

    // Callback registration
    loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            AccessToken accessToken = loginResult.getAccessToken();
            GraphRequest request = GraphRequest.newMeRequest(accessToken, new GraphRequest.GraphJSONObjectCallback() {
                @Override
                public void onCompleted(JSONObject user, GraphResponse graphResponse) {

                  //Need User email address after login success.

                }
            }).executeAsync();
        }

        @Override
        public void onCancel() {
            Toast.makeText(getActivity(), "fail", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onError(FacebookException exception) {
            Toast.makeText(getActivity(), "error", Toast.LENGTH_SHORT).show();
        }
    });

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_facebook_login, container, false);
    return view;
}


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

解决方案

Yeah it worked. Only thing required was to change GraphRequest to GraphRequestAsyncTask in onSuccess method of FacebookCallBack, and then user details could easily be fetched from the JSONObject.

        @Override
        public void onSuccess(LoginResult loginResult) {
            final AccessToken accessToken = loginResult.getAccessToken();
            final FBUser fbUser = new FBUser();
            GraphRequestAsyncTask request = GraphRequest.newMeRequest(accessToken, new GraphRequest.GraphJSONObjectCallback() {
                @Override
                public void onCompleted(JSONObject user, GraphResponse graphResponse) {
                    fbUser.setEmail(user.optString("email"));
                    fbUser.setName(user.optString("name"));
                    fbUser.setId(user.optString("id"));
                }
            }).executeAsync();
        }

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