private val CHANNEL = "com.abc.app/rating"

  override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
      super.configureFlutterEngine(flutterEngine)
      MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler {
              call, result ->
          if (call.method == "rateOnGooglePlay") {
              if (call.hasArgument("packageName")) {
                  val packageName = call.argument<String>("packageName")
                  if (packageName != null && packageName.isNotEmpty()) {
                      val res = rateOnGooglePlay(packageName)
                      result.success(res)
                  } else {
                      result.error("400", "Package name error", "Package name is empty")
                  }
              }
          } else {
              print("Something")
          }
      }

  }

  private fun rateOnGooglePlay(packageName: String) : Boolean {
      return try {
          startActivity(Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=$packageName")))
          true
      } catch (e: ActivityNotFoundException) {
          startActivity(Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=$packageName")))
          false
      }
  }