如何使用MethodChannel从本机平台调用应用程序的Dart部分中的方法？

签名是

void setMethodCallHandler(Future<dynamic> handler(MethodCallcall))

Future<dynamic>

_channel.setMethodCallHandler(myUtilsHandler);

然后实现处理程序。这个处理两种方法

foo

bar

String

double

  Future<dynamic> myUtilsHandler(MethodCall methodCall) async {    switch (methodCall.method) {      case 'foo':        return 'some string';      case 'bar':        return 123.0;      default:        throw MissingPluginException('notImplemented');    }  }

在Java端，返回值传递给回调

success

Result

channel.invokeMethod("foo", arguments, new Result() {  @Override  public void success(Object o) {    // this will be called with o = "some string"  }  @Override  public void error(String s, String s1, Object o) {}  @Override  public void notImplemented() {}});

在Swift中，返回值是

Any?

result

NSObject

FlutterMethodNotImplemented

channel.invokeMethod("foo", arguments: args, result: {(r:Any?) -> () in  // this will be called with r = "some string" (or FlutterMethodNotImplemented)})