Capture location in all states app
OK i am going to make this as simple as possible..Enable Background Modes and tick background fetch like this
Follow this methods for every step
When app is TERMINATED
AppDelegate.h
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
@interface AppDelegate : UIResponder <UIApplicationDelegate,CLLocationManagerDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong,nonatomic) CLLocationManager *locationManager;
@end
AppDelegate.m
#define userDef [NSUserDefaults standardUserDefaults]
#define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
#import "AppDelegate.h"
#import <CoreLocation/CoreLocation.h>
#import "AFNetworking.h"
#import <GoogleMaps/GoogleMaps.h>
@implementation AppDelegate{
BOOL fromTerminated;
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
fromTerminated = NO;
if ([launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey]) {
fromTerminated = YES;
self.locationManager = [[CLLocationManager alloc]init];
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
self.locationManager.activityType = CLActivityTypeOtherNavigation;
[self.locationManager startUpdatingLocation];
}
return YES;
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
if(self.locationManager){
[self.locationManager stopMonitoringSignificantLocationChanges];
self.locationManager = nil;
self.locationManager.delegate = nil;
}
self.locationManager = [[CLLocationManager alloc]init];
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
self.locationManager.activityType = CLActivityTypeOtherNavigation;
if(IS_OS_8_OR_LATER) {
[self.locationManager requestAlwaysAuthorization];
}
[self.locationManager startMonitoringSignificantLocationChanges];
}
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
NSLog(@"locationManager didUpdateLocations: %@",locations);
if(fromTerminated){
CLLocation * newLocation = [locations lastObject];
CLLocationCoordinate2D theLocation = newLocation.coordinate;
CLLocationAccuracy theAccuracy = newLocation.horizontalAccuracy;
[userDef setObject:[NSString stringWithFormat:@"%f",theLocation.longitude] forKey:@"LONGITUDE"];
[userDef setObject:[NSString stringWithFormat:@"%f",theLocation.latitude] forKey:@"LATITUDE"];
self.myLocation = theLocation;
self.myLocationAccuracy = theAccuracy;
[self updateLocation];
}
}
-(void)updateLocation{
// call your webservice for updating
}
@end
This code will do the following-->
Background fetch will trigger a location change and will launch the application and didFInishLaunchingWithOptions will be called with a UIApplicationLaunchOptionsLocationKey in the option dictionary. If it finds this that means the application is TERMINATED and woke up for background fetch. Now you got 30 seconds or so to do your stuff. So you create a location manager object and start updating, which will trigger your didUpdateLocations delegate method and then you can call your method to trigger that changed location in your server or database.
In your normal VC create another Location Manager object just like you created in the didFinishiLaunchingWithOptions method and implement the delegate method didUpdateLocation this will run untill the application is in foreground or background. The app delegate method hack will trigger the application when its terminated.
Cheers :)
[EDIT]
When app is in foreground or Background
#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
@interface ViewController ()<CLLocationManagerDelegate>
@property (nonatomic,strong) CLLocationManager *locationManager;
@end
@implementation ViewController{
}
-(void)viewDidAppear:(BOOL)animated{
if(self.locationManager == nil){
_locationManager = [CLLocationManager new];
}
_locationManager.delegate = self;
_locationManager.distanceFilter = kCLDistanceFilterNone;
_locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0 && [CLLocationManager authorizationStatus] != kCLAuthorizationStatusAuthorizedWhenInUse) {
[_locationManager requestAlwaysAuthorization];
} else {
[_locationManager startUpdatingLocation];
}
}
- (void) locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
_locationManager = nil;
CLLocation *location = [locations lastObject];
theUser.latitude = [NSString stringWithFormat:@"%f",location.coordinate.latitude];
theUser.longitude = [NSString stringWithFormat:@"%f",location.coordinate.longitude];
}
}
- (void)locationManager:(CLLocationManager*)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
switch (status) {
case kCLAuthorizationStatusNotDetermined: {
} break;
case kCLAuthorizationStatusDenied: {
} break;
case kCLAuthorizationStatusAuthorizedWhenInUse:
case kCLAuthorizationStatusAuthorizedAlways: {
[_locationManager startUpdatingLocation]; //Will update location immediately
} break;
default:
break;
}
}
@end
[EDIT]
TO check that app is getting launched after terminated state do this change and hit the run button and change the location of the device from the storyboard
Do this change, and Run the project (Do this in debug mode of a device)
and change location by this and then stick a breakpoint in applicationDidFinishLaunchingWithOptions and you will see the breakpoint is hit, meaning the app was in terminated state but this location change has triggered the OS to launch the application.
Hope could make you understand
Get Location Updates for iOS App Even when Suspended
After months of trials and errors by experimenting the Core Location Framework, I have found the solution to get location update even when the app is killed/suspended. It works well for both iOS 7 and 8.
Here is the solution:-
If your app is a location based mobile application that needs to monitor the location of the device when it has significant changes, the iOS will return you some location coordinates when the device has moved more than 500 meters from the last known location. Yes, even when the app is killed/suspended either by the user or iOS itself, you still can get the location updates.
So in order for a locationManager to get location update even when the app is killed/suspended, you must use the method startMonitoringSignificantLocationChanges, you can not use startUpdatingLocation.
When iOS wants to return the location update to the app, it will help you to relaunch the app and return a key UIApplicationLaunchOptionsLocationKey to the app delegate method didFinishLaunchingWithOptions.
The key UIApplicationLaunchOptionsLocationKey is very important and you must know how to handle it. You must create a new locationManager instance when you receive the key and you will get the location update on the locationManager delegate method didUpdateLocations.
Here is the sample code:-
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
self.shareModel = [LocationShareModel sharedModel];
if ([launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey]) {
self.shareModel.anotherLocationManager = [[CLLocationManager alloc]init];
self.shareModel.anotherLocationManager.delegate = self;
self.shareModel.anotherLocationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
self.shareModel.anotherLocationManager.activityType = CLActivityTypeOtherNavigation;
if(IS_OS_8_OR_LATER) {
[self.shareModel.anotherLocationManager requestAlwaysAuthorization];
}
[self.shareModel.anotherLocationManager startMonitoringSignificantLocationChanges];
}
return YES;
}
In addition to the didFinishLaunchingWithOptions method, I have created the locationManager instance when the app is active. Here are some code examples:
- (void)applicationDidEnterBackground:(UIApplication *)application
{
[self.shareModel.anotherLocationManager stopMonitoringSignificantLocationChanges];
if(IS_OS_8_OR_LATER) {
[self.shareModel.anotherLocationManager requestAlwaysAuthorization];
}
[self.shareModel.anotherLocationManager startMonitoringSignificantLocationChanges];
}
- (void)applicationDidBecomeActive:(UIApplication *)application
{
if(self.shareModel.anotherLocationManager)
[self.shareModel.anotherLocationManager stopMonitoringSignificantLocationChanges];
self.shareModel.anotherLocationManager = [[CLLocationManager alloc]init];
self.shareModel.anotherLocationManager.delegate = self;
self.shareModel.anotherLocationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
self.shareModel.anotherLocationManager.activityType = CLActivityTypeOtherNavigation;
if(IS_OS_8_OR_LATER) {
[self.shareModel.anotherLocationManager requestAlwaysAuthorization];
}
[self.shareModel.anotherLocationManager startMonitoringSignificantLocationChanges];
}
I have written an article explaining on the details on how to get the location update for iOS 7 and 8 even when the app is killed/suspended. I have also uploaded the complete source code on GitHub with the steps on how to test this solution.
Please visit the following URLs for more information:-
- Getting Location Updates for iOS 7 and 8 when the App is Killed/Terminated/Suspended
- Source Code on GitHub - Get the Location Updates Even when the iOS mobile apps is Suspended/Terminated/Killed
Where to capture the $location.search() vars in the run statement? In order to rebuild the state
Just figured it out!
I needed to add ? after dashboard:
const base = 'http://localhost:8080/app/#!/dashboard?';
And now it will work:
What is the simplest and most robust way to get the user's current location on Android?
Here's what I do:
- First of all I check what providers are enabled. Some may be disabled on the device, some may be disabled in application manifest.
- If any provider is available I start location listeners and timeout timer. It's 20 seconds in my example, may not be enough for GPS so you can enlarge it.
- If I get update from location listener I use the provided value. I stop listeners and timer.
- If I don't get any updates and timer elapses I have to use last known values.
- I grab last known values from available providers and choose the most recent of them.
Here's how I use my class:
LocationResult locationResult = new LocationResult(){
@Override
public void gotLocation(Location location){
//Got the location!
}
};
MyLocation myLocation = new MyLocation();
myLocation.getLocation(this, locationResult);
And here's MyLocation class:
import java.util.Timer;
import java.util.TimerTask;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
public class MyLocation {
Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled=false;
boolean network_enabled=false;
public boolean getLocation(Context context, LocationResult result)
{
//I use LocationResult callback class to pass location value from MyLocation to user code.
locationResult=result;
if(lm==null)
lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
//exceptions will be thrown if provider is not permitted.
try{gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){}
try{network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){}
//don't start listeners if no provider is enabled
if(!gps_enabled && !network_enabled)
return false;
if(gps_enabled)
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
if(network_enabled)
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
timer1=new Timer();
timer1.schedule(new GetLastLocation(), 20000);
return true;
}
LocationListener locationListenerGps = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerNetwork);
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
LocationListener locationListenerNetwork = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerGps);
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
class GetLastLocation extends TimerTask {
@Override
public void run() {
lm.removeUpdates(locationListenerGps);
lm.removeUpdates(locationListenerNetwork);
Location net_loc=null, gps_loc=null;
if(gps_enabled)
gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(network_enabled)
net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
//if there are both values use the latest one
if(gps_loc!=null && net_loc!=null){
if(gps_loc.getTime()>net_loc.getTime())
locationResult.gotLocation(gps_loc);
else
locationResult.gotLocation(net_loc);
return;
}
if(gps_loc!=null){
locationResult.gotLocation(gps_loc);
return;
}
if(net_loc!=null){
locationResult.gotLocation(net_loc);
return;
}
locationResult.gotLocation(null);
}
}
public static abstract class LocationResult{
public abstract void gotLocation(Location location);
}
}
Somebody may also want to modify my logic. For example if you get update from Network provider don't stop listeners but continue waiting. GPS gives more accurate data so it's worth waiting for it. If timer elapses and you've got update from Network but not from GPS then you can use value provided from Network.
One more approach is to use LocationClient http://developer.android.com/training/location/retrieve-current.html. But it requires Google Play Services apk to be installed on user device.
get the current location fast and once in android
Here, you can use this...
Example usage:
public void foo(Context context) {
// when you need location
// if inside activity context = this;
SingleShotLocationProvider.requestSingleUpdate(context,
new SingleShotLocationProvider.LocationCallback() {
@Override public void onNewLocationAvailable(GPSCoordinates location) {
Log.d("Location", "my location is " + location.toString());
}
});
}
You might want to verify the lat/long are actual values and not 0 or something. If I remember correctly this shouldn't throw an NPE but you might want to verify that.
public class SingleShotLocationProvider {
public static interface LocationCallback {
public void onNewLocationAvailable(GPSCoordinates location);
}
// calls back to calling thread, note this is for low grain: if you want higher precision, swap the
// contents of the else and if. Also be sure to check gps permission/settings are allowed.
// call usually takes <10ms
public static void requestSingleUpdate(final Context context, final LocationCallback callback) {
final LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
boolean isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (isNetworkEnabled) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
locationManager.requestSingleUpdate(criteria, new LocationListener() {
@Override
public void onLocationChanged(Location location) {
callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
}
@Override public void onStatusChanged(String provider, int status, Bundle extras) { }
@Override public void onProviderEnabled(String provider) { }
@Override public void onProviderDisabled(String provider) { }
}, null);
} else {
boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (isGPSEnabled) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
locationManager.requestSingleUpdate(criteria, new LocationListener() {
@Override
public void onLocationChanged(Location location) {
callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
}
@Override public void onStatusChanged(String provider, int status, Bundle extras) { }
@Override public void onProviderEnabled(String provider) { }
@Override public void onProviderDisabled(String provider) { }
}, null);
}
}
}
// consider returning Location instead of this dummy wrapper class
public static class GPSCoordinates {
public float longitude = -1;
public float latitude = -1;
public GPSCoordinates(float theLatitude, float theLongitude) {
longitude = theLongitude;
latitude = theLatitude;
}
public GPSCoordinates(double theLatitude, double theLongitude) {
longitude = (float) theLongitude;
latitude = (float) theLatitude;
}
}
}
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