android - FlutterActivity MethodChannel和FlutterView

因此，大约4个月前，我编写了Flutter应用程序。现在，我想做一个小小的更改，但是我不能再编译应用程序了，因为GeneratedPluginRegistrant.registerWith(this)不再起作用了，我没有更改Kotlin代码，只更改了Dart代码。

“GeneratedPluginRegistrant.registerWith( this )”中的“此”向我显示此错误:

Type mismatch.
Required: FlutterEngine!
Found: MainActivity

MainActivity类:

import android.os.Bundle
import io.flutter.app.FlutterActivity
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugins.GeneratedPluginRegistrant
import io.flutter.view.FlutterMain

class MainActivity : FlutterActivity() {

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    GeneratedPluginRegistrant.registerWith(this) // here is the error: Type mismatch. Required: FlutterEngine! Found: MainActivity

    MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->
      if (call.method == "helloFromNativeCode") {
        val greetings = helloFromNativeCode()
        result.success(greetings)
      }
    }
  }

  private fun helloFromNativeCode(): String {
    return "Hello from Native Android Code"
  }

  companion object {
    private const val CHANNEL = "flutter.native/helper"
  }
}

如果使用:

import io.flutter.embedding.android.FlutterActivity

代替

import io.flutter.app.FlutterActivity

我可以用

override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }

但遇到以下问题:

MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->
      if (call.method == "helloFromNativeCode") {
        val greetings = helloFromNativeCode()
        result.success(greetings)
      }
    }

因为我在 flutterView 上遇到错误:

Unresolved reference: flutterView

代码如下所示:

import android.os.Bundle
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugins.GeneratedPluginRegistrant
import io.flutter.view.FlutterMain

class MainActivity : FlutterActivity() {
    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result -> // here is the error
      if (call.method == "helloFromNativeCode") {
        val greetings = helloFromNativeCode()
        result.success(greetings)
      }
    }
  }

  private fun helloFromNativeCode(): String {
    return "Hello from Native Android Code"
  }

  companion object {
    private const val CHANNEL = "flutter.native/helper"
  }
}

我希望有一个人可以帮助我。

最佳答案

代替flutterView，请使用flutterEngine.getDartExecutor()。