【Flutter】Flutter 混合开发 ( Flutter 与 Native 通信 | 在 Flutter 端实现 MethodChannel 通信 )

/// A named channel for communicating with platform plugins using asynchronous
/// method calls.
///
/// Method calls are encoded into binary before being sent, and binary results
/// received are decoded into Dart values. The [MethodCodec] used must be
/// compatible with the one used by the platform plugin. This can be achieved
/// by creating a method channel counterpart of this channel on the
/// platform side. The Dart type of arguments and results is `dynamic`,
/// but only values supported by the specified [MethodCodec] can be used.
/// The use of unsupported values should be considered programming errors, and
/// will result in exceptions being thrown. The null value is supported
/// for all codecs.
///
/// The logical identity of the channel is given by its name. Identically named
/// channels will interfere with each other's communication.
///
/// See: <https://flutter.dev/platform-channels/>
class MethodChannel {
}

class MethodChannel {
  /// Creates a [MethodChannel] with the specified [name].
  ///
  /// The [codec] used will be [StandardMethodCodec], unless otherwise
  /// specified.
  ///
  /// The [name] and [codec] arguments cannot be null. The default [ServicesBinding.defaultBinaryMessenger]
  /// instance is used if [binaryMessenger] is null.
  const MethodChannel(this.name, [this.codec = const StandardMethodCodec(), BinaryMessenger? binaryMessenger ])
  /// The logical channel on which communication happens, not null.
  final String name;
  /// The message codec used by this channel, not null.
  final MethodCodec codec;
}

@optionalTypeArgs
  Future<T?> invokeMethod<T>(String method, [ dynamic arguments ]) {
    return _invokeMethod<T>(method, missingOk: false, arguments: arguments);
  }

import 'package:flutter/services.dart';

static const MethodChannel _methodChannel =
    const MethodChannel('MethodChannel');

String response = await _methodChannel.invokeMethod('send', value);