I would like to send different config settings from the background geolocation plugin to my server. However, I am not sure how to get that to work. I have the location server ready for the most part. Just not sure how to send that data. I would like to place the start tracking config in a post request. But not sure how to retrieve that info and if the code I have below is even correct. Thanks!
location.ts
import { Injectable, NgZone } from '@angular/core';
import { BackgroundGeolocation, BackgroundGeolocationConfig } from '@ionic-native/background-geolocation';
import { Geolocation, Geoposition } from '@ionic-native/geolocation';
import 'rxjs/add/operator/filter';
@Injectable()
export class LocationTracker {
public watch: any;
public lat: number = 0;
public lng: number = 0;
public bearing: number = 0;
public speed: number = 0;
constructor(public zone: NgZone, public backgroundGeolocation: BackgroundGeolocation, public geolocation: Geolocation) {
}
startTracking() {
let config = {
desiredAccuracy: 0,
stationaryRadius: 20,
distanceFilter: 10,
debug: true,
interval: 2000,
bearing: 10,
speed: 0,
};
this.backgroundGeolocation.configure(config).subscribe((location) => {
console.log('BackgroundGeolocation: ' + location.latitude + ',' + location.longitude);
// Run update inside of Angular's zone
this.zone.run(() => {
this.lat = location.latitude;
this.lng = location.longitude;
});
}, (err) => {
console.log(err);
});
// Turn ON the background-geolocation system.
this.backgroundGeolocation.start();
// Foreground Tracking
let options = {
frequency: 60000,
enableHighAccuracy: true
};
this.watch = this.geolocation.watchPosition(options).filter((p: any) => p.code === undefined).subscribe((position: Geoposition) => {
console.log(position);
// Run update inside of Angular's zone
this.zone.run(() => {
this.lat = position.coords.latitude;
this.lng = position.coords.longitude;
});
});
}
stopTracking() {
console.log('stopTracking');
this.backgroundGeolocation.finish();
this.watch.unsubscribe();
}
}
Your code is for Ionic 4. Not sure if it is applicable to ionic 2
Here is what I did.
The instruction at https://ionicframework.com/docs/native/background-geolocation is very good. Only missing small part.
The missing code is what I considered important in order to keep on sending the location lat and long. I highlight the missing code.
import { BackgroundGeolocation, BackgroundGeolocationConfig, BackgroundGeolocationEvents, BackgroundGeolocationResponse } from '@ionic-native/background-geolocation';
constructor(private backgroundGeolocation: BackgroundGeolocation) { }
...
// Wrap this in a function to activate
const config: BackgroundGeolocationConfig = {
desiredAccuracy: 10,
stationaryRadius: 2, //I reduce this from 20 to 2
distanceFilter: 3, //I reduce this from 30 to 3
interval: 2000, //This is missing from example
debug: true, // enable this hear sounds for background-geolocation life-cycle.
stopOnTerminate: false, // enable this to clear background location settings when the app terminates
};
this.backgroundGeolocation.configure(config)
.then(() => {
this.backgroundGeolocation.on(BackgroundGeolocationEvents.location).subscribe((location: BackgroundGeolocationResponse) => {
console.log(location);
//DO YOUR HTTP POST HERE TO SEND LOCATION LAT AND LONG TO SERVER
// IMPORTANT: You must execute the finish method here to inform the native plugin that you're finished,
// and the background-task may be completed. You must do this regardless if your operations are successful or not.
// IF YOU DON'T, ios will CRASH YOUR APP for spending too much time in the background.
this.backgroundGeolocation.finish(); // FOR IOS ONLY
});
});
// start recording location
this.backgroundGeolocation.start();
// If you wish to turn OFF background-tracking, call the #stop method.
// Wrap this inside a call off function to stop backgroundGeolocation
this.backgroundGeolocation.stop();