DART代码无法在Flutter插件中找到平台实现

Question

我创建了Flutter插件。但是我还需要添加更多渠道。因此，我同时创建了DART代码和本机实现。问题在于，飞镖代码无法找到本机实现，因此它散发出消息“未手持例外：缺少pluginexception（未找到方法...）”，

我将我的本机实现与样品板实现进行了比较，我不喜欢t看到任何错误。我有正确的频道名称。我已经注册了频道。我的频道名称当然与Builderplate实现的频道名称不同。但它与飞镖代码中的一个相匹配。

我想知道，即使我代表不同的功能块，我是否需要所有本机实现都具有相同的频道名称？

Answer 1

您可以为插件创建多个方法渠道，并为每个方法频道分配一个单独的MethodCallHandler。这样，如果在不同的频道中，您可以处理两种具有相同名称的方法。

这是我如何更改“颤动插件”模板以支持多个方法通道的方式。

PS：我使用了Flutter 2.10.5插件模板，因为它更容易理解。在Flutter 3中，他们在飞镖侧添加了一个接口。

飞镖：

class ExamplePlugin {
  static const MethodChannel _channel = MethodChannel('example_plugin');
  static const MethodChannel _channel2 = MethodChannel('example_plugin2');

  static Future<String?> get platformVersion async {
    final String? version = await _channel.invokeMethod('getPlatformVersion');
    return version;
  }

  static Future<String?> get helloWorld async {
    final String? helloWorld = await _channel2.invokeMethod('getHelloWorld');
    return helloWorld;
  }
}

kotlin：

class ExamplePlugin: FlutterPlugin {
  private lateinit var channel : MethodChannel
  private lateinit var channel2 : MethodChannel

  private val firstMethodCallHandler = FirstMethodCallHandler()
  private val secondMethodCallHandler = SecondMethodCallHandler()

  override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
    channel = MethodChannel(flutterPluginBinding.binaryMessenger, "example_plugin")
    channel.setMethodCallHandler(firstMethodCallHandler)

    channel2 = MethodChannel(flutterPluginBinding.binaryMessenger, "example_plugin2")
    channel2.setMethodCallHandler(secondMethodCallHandler)
  }

  override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) {
    channel.setMethodCallHandler(null)
    channel2.setMethodCallHandler(null)
  }

  private inner class FirstMethodCallHandler: MethodCallHandler {
    override fun onMethodCall(call: MethodCall, result: Result) {
      if (call.method == "getPlatformVersion") {
        result.success("Android ${android.os.Build.VERSION.RELEASE}")
      } else {
        result.notImplemented()
      }
    }
  }

  private inner class SecondMethodCallHandler: MethodCallHandler {
    override fun onMethodCall(call: MethodCall, result: Result) {
      if (call.method == "getHelloWorld") {
        result.success("Hello World!")
      } else {
        result.notImplemented()
      }
    }
  }
}

swift：

public class SwiftExamplePlugin: NSObject, FlutterPlugin {
  public static func register(with registrar: FlutterPluginRegistrar) {
    let channel = FlutterMethodChannel(name: "example_plugin", binaryMessenger: registrar.messenger())
    let channel2 = FlutterMethodChannel(name: "example_plugin2", binaryMessenger: registrar.messenger())
    
    channel.setMethodCallHandler(firstMethodCallHandler)
    channel2.setMethodCallHandler(secondMethodCallHandler)
  }

  static public func firstMethodCallHandler(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
    result("iOS " + UIDevice.current.systemVersion)
  }
    
  static public func secondMethodCallHandler(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
    result("Hello World!")
  }
}

完成源代码： https://github.com/colinschmale/example_plugin