Ionic google map not working in android platform

Ionic Framework ionic-v3
1

in google maps source to destination is notwrking my code isPreformatted text

import { Component } from ‘@angular/core’;
import { IonicPage, NavController, NavParams } from ‘ionic-angular’;
import { Geolocation } from ‘@ionic-native/geolocation’;

declare var google;
var distance;
var ttime;
declare var lat;
declare var lng;
var map;

/**

@IonicPage()
@Component({
selector: ‘page-getfare’,
templateUrl: ‘getfare.html’,
})
export class GetfarePage {
Destination: any = ‘’;
MyLocation: any;

map: any;

constructor(public navCtrl: NavController, public navParams: NavParams, public geolocation: Geolocation) {
}

ionViewDidLoad() {
this.initializeMap();
}
initializeMap() {

        let locationOptions = {timeout: 10000, enableHighAccuracy: true};
 
        this.geolocation.getCurrentPosition(locationOptions).then((position) => {
 
            let options = {
              center: new google.maps.LatLng(position.coords.latitude, position.coords.longitude),
              zoom: 15,
              mapTypeId: google.maps.MapTypeId.ROADMAP
            }
 
            /* Show our lcoation */
            this.map = new google.maps.Map(document.getElementById("map_canvas"), options);
 
            /* We can show our location only if map was previously initialized */
            this.showMyLocation();

           

 
        }).catch((error) => {
          console.log('Error getting location', error);
        });
    } 
 
    /*
     * This function will create and show a marker representing your location
     */
    showMyLocation(){
 
        let marker = new google.maps.Marker({
            map: this.map,
            animation: google.maps.Animation.DROP,
            position: this.map.getCenter()
        });
 
        let markerInfo = "<h4>You are here!</h4>";         
 
        let infoModal = new google.maps.InfoWindow({
            content: markerInfo
        });
 
        google.maps.event.addListener(marker, 'click', () => {
            infoModal.open(this.map, marker);
        });

        
    }

    calculateAndDisplayRoute() {
      let that = this;
      let directionsService = new google.maps.DirectionsService;
      let directionsDisplay = new google.maps.DirectionsRenderer;



      var destination_input = document.getElementById('cdest');
      const map = new google.maps.Map(document.getElementById('map_canvas'), {
        zoom: 7,
        center: {lat: 41.85, lng: -87.65}
      });
      directionsDisplay.setMap(map);

  
      if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(function(position) {
          var pos = {
            lat: position.coords.latitude,
            lng: position.coords.longitude
          };
          map.setCenter(pos);
          that.MyLocation = new google.maps.LatLng(pos);
  
        }, function() {
  
        });
      } else {
        // Browser doesn't support Geolocation
      }
  
      directionsService.route({
      origin: this.MyLocation,
      destination: this.Destination,
      travelMode: 'DRIVING'
    }, function(response, status) {
      if (status === 'OK') {
        directionsDisplay.setDirections(response);

        var route = response.routes[0].legs[0];
        distance = (route.distance.value * 0.000621371192).toPrecision(4);
        ttime = ((route.duration.value) / 60);
        
  
      var cost_per_mile = 2.47;
      var fdrop = 25.00;
      var min_mile = 10;
      

      if(distance <= min_mile){
        var ifare = fdrop;
      } else {
      var ifare = (((distance - min_mile) * cost_per_mile) + fdrop);
      }
        
      document.getElementById('dfare').innerHTML = '$' + ifare.toFixed(2) + '<br>' + parseFloat(distance).toFixed(2) +' Miles<BR>Estimated Time : '  + parseFloat(ttime).toFixed(2) + ' Mins ';
      } else {
        window.alert('Directions request failed due to ' + status);
      }
    });
  }

}