参考资料：

 

举个例子，我们想从Native端请求Flutter端的一个getFlutterName方法获取一个字符串。在Flutter端你需要给MethodChannel设置一个MethodCallHandler：

platform.setMethodCallHandler(platformCallHandler);Future
     
       platformCallHandler(MethodCall call) async {    switch (call.method) {            case "getFlutterName":            return "Flutter name flutter";            break;    }}
     

Dart端：核心关键就是直接return 需要返回的数据即可！

 

Java端：就是用CallBack的形式来接收返回的数据：

mChannel.invokeMethod(RCMethodList.MethodCallBackGetUserInfo, userId, new Result() {            @Override            public void success(@Nullable Object arg) {                if (arg instanceof Map) {                    Map map = (Map) arg;                    String userId = (String) map.get("userId");                    String name = (String) map.get("name");                    String portraitUri = (String) map.get("portraitUrl");                    UserInfo userInfo = new UserInfo(userId, name, Uri.parse(portraitUri));                    flutterCallBack.success(userInfo);                }            }            @Override            public void error(String s, @Nullable String s1, @Nullable Object o) {                flutterCallBack.error("获取用户信息失败:" + s, null);            }            @Override            public void notImplemented() {                flutterCallBack.error("flutter 端没有实现getUserInfoByUserId接口", null);            }        });