问题
According to current documentation of flutter platfrom channel it seems only possible to call host (Native) from client (Dart) and then we get response from host. Is there any possiblity of its reverse, e.g. to call directly Client from host?
回答1:
Yes, this is possible using MethodChannel.
You will to specify a call handler on your method channel by using setMethodCallHandler.
As an example, the Java version of MethodChannel has the invokeMethod method just like the Dart class has. This means that you can use invokeMethod on all platform. If you are calling it from native, you will have to set a method call handler in Flutter and vise versa.
On iOS it is exactly the same.
来源：https://stackoverflow.com/questions/56201503/flutter-both-directions-of-platform-channel-call