npm install --save @ionic-native/geolocation

import { Geolocation } from '@ionic-native/geolocation';
@NgModule({
    providers: [
		{ provide: ErrorHandler, useClass: IonicErrorHandler },
        Geolocation
    ]
})

import { Injectable } from '@angular/core';
import { Geolocation } from '@ionic-native/geolocation';
@Injectable()
export class GeolocationService {
     constructor(
        private geolocation: Geolocation
     ) {}
}

 <script type="text/javascript" src="http://webapi.amap.com/maps?v=1.4.1&key=99f20bf360cfecd1eb94acfcb6819474"></script>
 <script type="text/javascript" src="http://developer.baidu.com/map/jsdemo/demo/convertor.js"></script>

 /**
  * Get current geographic location
  */
getCurrentPosition(): Promise<{ latitude: string, longitude: string }> {
        return this.geolocation.getCurrentPosition().then(res => {
            let latitude = res.coords.latitude.toString();  //latitude
            let longitude = res.coords.longitude.toString(); //longitude
            let locations = { latitude: latitude , longitude: longitude };
            return Promise.resole(locations );
        }).catch(e => {
            console.log(e);
            return Promise.reject(e);
        });
 }

Change geolocation coordinates to Baidu map coordinates

import { Injectable } from '@angular/core';
declare var BMap;//Declaration Baidu map
@Injectable()
export class GeolocationService {
    /**
     * Convert latitude and longitude to Baidu map coordinates
     * @param latitude  latitude  
     * @param longitude  longitude
     */
    transferBaiDuMapLocations(longitude,latitude){
          let gpsPoint = new BMap.Point(longitude, latitude);
          return BMap.Convertor.translate(gpsPoint, 0, (point) => {
          if (point.lat && point.lng) {
             return Promise.resolve({ latitude: point.lat, longitude: point.lng });
          } else {
             return Promise.reject('Baidu coordinate conversion failed!');
          }
      });
    }
}

Change the geolocation coordinate to the Gaud map coordinate

import { Injectable } from '@angular/core';
declare var AMap;//Statement Gaud map
@Injectable()
export class GeolocationService {
    /**
     * Coordinate transformation of Gaud map
     * @param latitude  latitude  
     * @param longitude  longitude
     */
    positionTransfer(latitude, longitude){
        let latlon = longitude + ',' + latitude;
        let url = "https://restapi.amap.com/v3/assistant/coordinate/convert? locations="+latlon+"&coordsys=gps&output=json&key=059b0ae61fe2a851334e9a2395440b23";
        let  returnMap:ReturnMapEntry;
        return this.http.get(url).toPromise().then(response => {
            let res = response.json();
            if (res.status == 1) {
                returnMap = { is_ok: true, result: res.locations };
            } else {
                returnMap = { is_ok: false, msg: 'Failed to get address, please try again!' };
            }
            return Promise.resolve(returnMap);
        }).catch(error => {
            console.log(error);
            return Promise.reject(error);
        });
    }
}

Get the current position longitude and latitude directly using Gaud map (not converted to Gaud map coordinates)

import { Injectable } from '@angular/core';
declare var AMap;
@Injectable()
export class GeolocationService {
     /**
     * Obtaining the longitude and latitude of the current position from Gaud map
     */
    goLocation() {
        let that = this; let mapObj = new AMap.Map('iCenter');
        mapObj.plugin('AMap.Geolocation', function () {
            let geolocation = new AMap.Geolocation({
                enableHighAccuracy: true,//Use high precision positioning, default: true         
                timeout: 10000,          //Stop positioning after more than 10 seconds, default: infinite         
                maximumAge: 0,           //Location result cache 0 ms, default: 0        
                convert: true,           //Auto offset coordinate. The offset coordinate is Gaud coordinate. Default: true         
                showButton: true,        //Display positioning button, default: true         
                buttonPosition: 'LB',    //Positioning button docking position, default: 'LB', lower left corner         
                buttonOffset: new AMap.Pixel(10, 20),//Offset of positioning button from the set docking position, default: Pixel(10, 20) 
                showMarker: true,        //After the positioning is successful, the point mark will be displayed at the position to which it is located. Default: true   
                showCircle: true,        //Circle indicates the positioning accuracy range after the positioning is successful, default: true   
                panToLocation: true,     //After successful positioning, the location to be located will be taken as the map center point, default: true 
                zoomToAccuracy: true      //After successful positioning, adjust the scope of the map to make the location and precision range visible. Default: false   
            });
            mapObj.addControl(geolocation);
            geolocation.getCurrentPosition();
            AMap.event.addListener(geolocation, 'complete', that.onComplete.bind(that));//Return to location information      
            AMap.event.addListener(geolocation, 'error', (data) => {
                console.log('seek failed' + data);
            });   //Return location error message    
        });
    }
    //Analytical positioning results  
    onComplete(data) {
        console.log(data);
        console.log(data.position.toString());
        console.log(data.formattedAddress);
        var str = ['Successful positioning'];
        str.push('Longitude:' + data.position.getLng());
        str.push('Latitude:' + data.position.getLat());
        if (data.accuracy) {
            str.push('Accuracy:' + data.accuracy + ' rice');
        }//If it is IP precise positioning result, there is no precision information     
        str.push('Offset or not:' + (data.isConverted ? 'yes' : 'no'));
        // document.getElementById('tip').innerHTML = str.join('<br>');  
    }
}

Get Chinese address according to latitude and longitude

/**
     * Get the address according to latitude and longitude
     * @param latitude  latitude  
     * @param longitude  longitude
     * @param mapType Map type Baidu map Gaode map
     */
    showPosition(latitude, longitude, mapType: string = 'Gould map'): Promise<ReturnMapEntry> {
        let latlon = latitude + ',' + longitude;
        let returnMap: ReturnMapEntry;
        //Baidu map interface  
        var url = "http://api.map.baidu.com/geocoder/v2/?ak=18246a9bf529aba431bacdc2547dc523&location=" + latlon + "&output=json&pois=0";
        if (mapType == 'Gould map') {
            latlon = longitude + ',' + latitude;
            url = "http://restapi.amap.com/v3/geocode/regeo?location=" + latlon + "&key=059b0ae61fe2a851334e9a2395440b23";
        }
        return this.http.get(url).toPromise().then(response => {
            let res = response.json();
            if (res.status == 1) {
                returnMap = { is_ok: true, result: res.regeocode.formatted_address };
            } else {
                returnMap = { is_ok: false, msg: 'Failed to get address, please try again!' };
            }
            return Promise.resolve(returnMap);
        }).catch(error => {
            console.log(error);
            return Promise.reject(error);
        });
    }

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