connecting java with flutter using method channel

methodchannel.java

package com.example.ourproject;

import android.os.Bundle;
import io.flutter.app.FlutterActivity;
import io.flutter.plugins.GeneratedPluginRegistrant;
import android.widget.Toast;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
import io.flutter.plugin.common.MethodChannel.Result;

public class MainActivity extends FlutterActivity {
	private static final String CHANNEL = "ourproject.sendstring";

  	@Override
  	protected void onCreate(Bundle savedInstanceState) {
    	super.onCreate(savedInstanceState);
    	GeneratedPluginRegistrant.registerWith(this);

    	new MethodChannel(getFlutterView(), CHANNEL).setMethodCallHandler(
                new MethodCallHandler() {
                    @Override
                    public void onMethodCall(MethodCall call, Result result) {
                    	if (call.method.equals("callSendStringFun")) {
        					      showHelloFromFlutter(call.argument("arg"));
        					      String temp = sendString();
            				    result.success(temp);
    					        } else {
        					      result.notImplemented();
    					        }
                    }
     			});
  	}

  	private String sendString(){
    	String stringToSend = "Hello from Kotlin";
    	return stringToSend;
  	}

  	private void showHelloFromFlutter(String argFromFlutter){
  		Toast.makeText(this, argFromFlutter, Toast.LENGTH_SHORT).show();
	  }

}