안드로이드 초보 질문좀 드리겠습니다.[Marker event]

Question

에러가 뜨는데. 홈페이지를 봐도 

package kr.co.company.mainactivity_map;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

public class myact extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    private Marker markerS;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_myact);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }
    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        LatLng Tokyo = new LatLng(35.6894875, 139.6917064);
        mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); // map type is normal
        markerS = mMap.addMarker(new MarkerOptions().position(Tokyo).title("도쿄 지역입니다")
                .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(Tokyo));
        mMap.setOnMarkerClickListener(new OnMarkerClickListener(){
            @Override
            public boolean onMarkerClick(Marker markerS) {
                if (markerS.getTitle().equals("Click marker")) // if marker source is clicked
                    Toast.makeText(myact.this, markerS.getTitle(), Toast.LENGTH_SHORT).show();// display toast
                return true;
            }
        });
    }
}

에서  mMap.setOnMarkerClickListener()에서 괄호안에 new OnMarkerClickListener로 하면 에러가 뜨고 googlemap.하면 에러가 안뜨는데 실행후 마커를 누르면 아무것도 뜨질 않네요..   마커클릭 인자를 markerS로 줬는데.. 초보개발 힘드네요. ㅠㅠ