Google maps camera_move

Ionic Native
1

Hello, i have the next code in Ionic 3 :

this.mapElement = document.getElementById(‘map’);

let mapOptions: GoogleMapOptions = {
  camera: {
    target: {
      lat: 43.0741904,
      lng: -89.3809802
    },
    zoom: 18,
    tilt: 30
  }
};

this.map = this.googleMaps.create(this.mapElement, mapOptions);

this.map.one(GoogleMapsEvent.MAP_READY)
.then(() => {
console.log(‘Map is ready!’);

    this.map.addEventListener(GoogleMapsEvent.CAMERA_MOVE).subscribe((camera)=>{
         this.marker.setPosition({lat:(camera.target.lat+0.0002) ,lng:camera.target.lng});
          
          this.lat = camera.target.lat;
          this.lng = camera.target.lng;
          this.transparency = true;
        });

        this.map.addEventListener(GoogleMapsEvent.CAMERA_MOVE_END).subscribe((camera)=>{
         this.marker.setPosition({lat:(camera.target.lat) ,lng:camera.target.lng});

          this.lat = camera.target.lat;
          this.lng = camera.target.lng;
          this.transparency = false;
          
        });

(I declared all variables before the constructor)
In the view i must show the latitude, longitude and i want a button with transparency. But in the view not refresh the lat, lng and transparency values on camera move.
Code in the view:

{{lat}} - {{lang}}

I’m from Argentina, sorry for my bad english. Thanks.