flutter - Invoking method from android activity - flutter

Question

I tried to app to app communication on Flutter - Android.
First, Android app(A) bound Flutter service which Android Service(B).
Then A call to B and B start activity.
Second, activity invoke method on Flutter using MethodChannel.
But I faced the Exception.
How to invoke flutter method on Android activity that start with Android service.
Exception
E/flutter (12950): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method getDatabasesPath on channel com.tekartik.sqflite)
E/flutter (12950): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method getAll on channel plugins.flutter.io/shared_preferences)
MyService.kt
class MyService : Service() {
private lateinit var mMessenger: Messenger
internal class IncomingHandler(context: Context,
private val applicationContext: Context = context.applicationContext
) : Handler() {
override fun handleMessage(msg: Message) {
super.handleMessage(msg)
when (msg.what) {
WHAT_REQ_VP -> {
applicationContext.startActivity(Intent(applicationContext,
TempActivity::class.java)
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
}
}
}
}
override fun onBind(intent: Intent): IBinder {
mMessenger = Messenger(IncomingHandler(this))
return mMessenger.binder
}
}
TempActivity.kt
class TempActivity : FlutterActivity() {
private lateinit var channel: MethodChannel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_temp)
val backgroundFlutterView = FlutterNativeView(baseContext, true)
channel = MethodChannel(backgroundFlutterView, "com.example.test")
GeneratedPluginRegistrant.registerWith(this)
channel.setMethodCallHandler { call, result -> run {
when (call.method) {
"result" -> {
print(call.argument<String>("result"))
}
else -> {}
}
} }
findViewById<Button>(R.id.btn_confirm).setOnClickListener {
val arguments = HashMap<String, String>()
arguments["message"] = "From Android"
channel.invokeMethod("test", arguments)
}
}
}
temp.dart
import 'package:flutter/services.dart';
class Temp {
static final _singleton = Temp._internal();
static const MethodChannel _channel = const MethodChannel('com.example.test');
factory Temp() {
return _singleton;
}
Temp._internal() {
_channel.setMethodCallHandler(_handleMethod);
}
_handleMethod(MethodCall call) {
switch (call.method) {
case 'test':
print('_handleMethod: ${call.method}');
_channel.invokeMethod('result', 'Result from flutter client');
}
}
}