problem in configureFlutterEngine method writing kotlin code in flutter

Question

I wanted to write platform specific code in flutter, according to the flutter documentation we should override configureFlutterEngine method like code snippet below:

override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
    GeneratedPluginRegistrant.registerWith(flutterEngine)
    MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler {
      call, result ->
      // Note: this method is invoked on the main thread.
      // TODO
    }
  }

but when I pass flutterEngine to GeneratedPluginRegistrant.registerWith(), It says:

Type mismatch: inferred type is FlutterEngine but PluginRegistry! was expected

I've already checked link below in github but didn't find any solution working for me. https://github.com/flutter/flutter/issues/45231

here is the link of flutter documentation for writing platform specific code. https://flutter.dev/docs/development/platform-integration/platform-channels?tab=android-channel-kotlin-tab#example-project

Solution 1

Instead of configureFlutterEngine() method, I used onCreate() and now is working fine.

override fun onCreate(savedInstanceState: Bundle?) {
    GeneratedPluginRegistrant.registerWith(this)
    MethodChannel(flutterView, CHANNEL).setMethodCallHandler {
      call, result ->
      // Note: this method is invoked on the main thread.
      // TODO
    }
  }

Instead of passing flutterEngine.dartExecutor.binaryMessenger to MethodChannel, pass flutterView.

Solution 2

This is how I used it in kotlin

import androidx.annotation.NonNull
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.MethodChannel

class MainActivity: FlutterActivity() {
  private val CHANNEL = "samples.flutter.dev/battery"

  override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
    super.configureFlutterEngine(flutterEngine)
    MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler {
      call, result ->
      // Note: this method is invoked on the main thread.
      // TODO
    }
  }
}

Make sure to use same imports as shown. Read Docs

Comments

[Pawan]

How to get FlutterView ? It also gives error at registerWith(this)

[Omar Essam]

Worked . . Thank you bro

[Rashmi Bhandari]

@Zohab Ali For me configureFlutterEngine it's not calling. Any idea what can be an issue. Followed the same steps as above.