How to track user location in background?

Question

I'm looking for an open source app or library to track user location in the background. Now I'm trying to do it with CLLocation and background tasks, but accuracy is not enough for my case. Could you explain, how apps, like "moves", "runkeeper", "endmondo", creates my route? Should I use Accelerometer or/and compass to create a route between CLLocation background points?

Some code:

//location manager init
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.distanceFilter = kCLDistanceFilterNone;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.delegate = self;


#pragma mark - CLLocationManager Delegate

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

    if ([self isInBackground]) {
        if (self.locationUpdatedInBackground) {
            bgTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler: ^{
                [[UIApplication sharedApplication] endBackgroundTask:bgTask];
            }];

            self.locationUpdatedInBackground(newLocation);
            [self endBackgroundTask];
        }
    } else {
        if (self.locationUpdatedInForeground) {
            self.locationUpdatedInForeground(newLocation);
        }
    }
}

UPD: Justed tested my app with next properties

self.locationManager.distanceFilter = kCLDistanceFilterNone;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.activityType = CLActivityTypeFitness;
self.locationManager.pausesLocationUpdatesAutomatically=NO;

In this case I have about 10 fired events during 1,5 hour trip

Answer 1

you don't ask for code. You ask for: "I'm looking for an open source app or library"

It may help you to visit this website.

hope it helps you,

Also a tutorial.

Answer 2

Here was my solution to this,

Declare the instance variable:

CLLocationManager *locationManager;

Be sure to include the delegate

<CLLocationManagerDelegate>

In viewDidLoad:

locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move, location is updated
locationManager.desiredAccuracy = kCLLocationAccuracyBest; // get best current locaton coords
locationManager.headingFilter = 1;
[locationManager startUpdatingLocation];
[locationManager startUpdatingHeading];

Implement the delegate method:

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    int degrees = newLocation.coordinate.latitude;
    double decimal = fabs(newLocation.coordinate.latitude - degrees);
    int minutes = decimal * 60;
    double seconds = decimal * 3600 - minutes * 60;
    NSString *lat = [NSString stringWithFormat:@"%d° %d' %1.4f\"",
                     degrees, minutes, seconds];
    NSLog(@" Current Latitude : %@",lat);
    latitudeLocation.text = lat;
    degrees = newLocation.coordinate.longitude;
    decimal = fabs(newLocation.coordinate.longitude - degrees);
    minutes = decimal * 60;
    seconds = decimal * 3600 - minutes * 60;
    NSString *longt = [NSString stringWithFormat:@"%d° %d' %1.4f\"",
                       degrees, minutes, seconds];
    NSLog(@" Current Longitude : %@",longt);
    longitudeLocation.text = longt;
}