topic Re: location aware gps realtime (android) in ArcGIS Runtime SDK for Android Questions

location aware gps realtime (android)

Anonymous User — Mon, 21 Jul 2014 18:46:39 GMT

Where do I find the android sdk to allow gps in realtime. Like the ESRI app where the gps move with you.

Re: location aware gps realtime (android)

Mapperzmap — Fri, 10 Dec 2021 20:44:47 GMT

The Android SDK

Location-based applications are now commonplace, but due to the less than optimal accuracy, user movement, the multitude of methods to obtain the location

String locationProvider = LocationManager.NETWORK_PROVIDER;
// Or, use GPS location data:
// String locationProvider = LocationManager.GPS_PROVIDER;

locationManager.requestLocationUpdates(locationProvider, 0, 0, locationListener);

Location Strategies | Android Developers‌

Re: location aware gps realtime (android)

ShellyGill1 — Tue, 22 Jul 2014 10:46:04 GMT

If you are building a map with the MapView from the ArcGIS Runtime SDK for Android, then you can use the LocationDisplayManager to set the map to automatically pan in navigation mode. See the LocationDisplayManager class: use the setAutoPan method and set the mode as NAVIGATION, and use the start method to start the auto-panning behaviour. There are differerent auto-pan modes - see the Nearby Sample for an example of using the LOCATION mode in an app.

Re: location aware gps realtime (android)

Anonymous User — Tue, 22 Jul 2014 13:28:40 GMT

Thanks , i'll give it a shot. Your the Best!

Re: location aware gps realtime (android)

Anonymous User — Tue, 22 Jul 2014 13:28:56 GMT

Thanks for the advice.

Re: location aware gps realtime (android)

ThomNgo — Wed, 23 Jul 2014 16:01:18 GMT

I followed LocationDisplayManager API, and it's still not working. My partial code is below

LocationDisplayManager ldm = mMapView.getLocationDisplayManager();

ldm.setAutoPanMode(AutoPanMode.NAVIGATION

ls.start();

What it does is even it shows the GPS moving, but the map doesn't stay focus (center) on the GPS, hence, the GPS will eventually move off the map. What I did to temporarily fix this is to implement LocationListener, onLocationChanged(Location loc) and have to set the map to zoom at location's longitude/latitude all the time, but performance wise is not very good.

       ldm = mMapView.getLocationDisplayManager();
       ldm.setAutoPanMode(AutoPanMode.LOCATION);
       ldm.setLocationListener(new LocationListener(){

@Override

       public void onLocationChanged(Location loc) {
            if (loc == null)
                  return;
            if (isMapFocus) {
                  mapOption = new MapOptions(MapType.TOPO, loc.getLatitude(), loc.getLongitude(), 17);
                  mMapView.setMapOptions(mapOption);
            }

}

});

Is there any sample that exactly does this?

thanks a lot,

Thom

Re: location aware gps realtime (android)

ShellyGill1 — Wed, 23 Jul 2014 16:37:07 GMT

If you're seeing the GPS updates on the map, first thing I would check is that you're not touching the map at all after the auto-pan is set - auto-panning is automatically turned off if the user interacts with the map and changes the extent manually (zooming or panning) or if the extent is changed programmatically - check getAutoPanMode(), and also worth checking that the location updates started correctly, using isStarted().

Re: location aware gps realtime (android)

ThomNgo — Wed, 23 Jul 2014 17:51:02 GMT

Thanks Shelly,

I checked isStarted() and it showed "true". Checked GetAutoPanMode(), it showed from NAVIGATION to OFF. The reason it went from NAVIGATION to OFF is because perhaps I zoomed to the GPS location after the map initialized. I have to zoom it because otherwise it only displays the world map from out of space view, which not really helping. Is there a way to setAutoPanMode from OFF back to NAVIGATION? Why autoPanMode not zooming to the GPS location automatically?

Thanks,

Thom

Re: location aware gps realtime (android)

ShellyGill1 — Thu, 24 Jul 2014 09:27:56 GMT

Hi Thom,

As far as I know, autoPanMode will pan, but it will not zoom, so perhaps you can set the zoom level you wish to use before you start the navigation? One way to do this automatically might be to set the AutoPanMode to OFF, set the LocationListener, and start() the LocationDisplayManager. Then just in the first call to onLocationChanged, set the zoom level there, and then switch the AutoPanMode to NAVIGATION. I've added some code as an example below.

Also I will make a note that we could add a sample to demonstrate navigation auto-pan mode, along with the initial zoom in, to the SDK.

   mLocationDisplayManager = mMapView.getLocationDisplayManager();
   mLocationDisplayManager.setAutoPanMode(AutoPanMode.OFF);
   mLocationDisplayManager.setLocationListener(new LocationListener() {

     boolean locationChanged = false;

     @Override
     public void onLocationChanged(Location location) {
  
     if (!locationChanged) {
  
       Point currentPt = new Point(location.getLongitude(), location.getLatitude());
       Point currentMapPt = (Point) GeometryEngine.project(currentPt, SpatialReference.create(4326), mMapView.getSpatialReference());
    
       // Use a suitable value for the typical app usage for when no accuracy is available.
       float accuracy = 100;
       if (location.hasAccuracy()) {
         accuracy = location.getAccuracy();
       }
    
       // Convert the accuracy to units of the map, and apply a suitable zoom factor for the app.
       Unit mapUnits = mMapView.getSpatialReference().getUnit();
       double zoomToWidth = 50 * Unit.convertUnits(accuracy, Unit.create(LinearUnit.Code.METER), mapUnits);
       Envelope zoomExtent = new Envelope(currentMapPt, zoomToWidth, zoomToWidth);
      
       // Make sure that the initial zoom is dont WITHOUT animation, or it may interfere with autopan.
       mMapView.setExtent(zoomExtent, 0, false);
  
       // Dont run this again.
     locationChanged = true;
  
     // Now switch to navigation mode.
     mLocationDisplayManager.setAutoPanMode(AutoPanMode.NAVIGATION);
     }
     }
  
     @Override
     public void onProviderDisabled(String provider) {
     }
  
     @Override
     public void onProviderEnabled(String provider) {
     }
  
     @Override
     public void onStatusChanged(String provider, int status, Bundle extras) {
     }
   });
  
   mLocationDisplayManager.start();

Re: location aware gps realtime (android)

ThomNgo — Fri, 25 Jul 2014 20:27:38 GMT

Thanks Shelly,

It worked. The difference between your code and my code is I used mMapView.zoomTo() to zoom, and it will stop AutoPan (because of animation?), even after I set autoPanMode back to Navigation.

mMapView.setExtent() in your example should do the trick.

thanks,

Thom

Re: location aware gps realtime (android)

ThomNgo — Tue, 29 Jul 2014 18:57:47 GMT

Hi Shelly,

From your sample, I'm wondering what's the use of zoomToWidth? When I debug, I saw this value changes but Envelope zoomExtent always the same, meaning the zoom scale at the end is the same.

With mMapView.setExtent(zoomExtent, 0, false), the zoom is too close, I want to be able to adjust the zoom but some how, it doesn't matter what zoomToWidth I passed in, the zoom is always the same.

Also, I'm not familiar with Geometry, what egs (SpatialReference.create(4326)) and wm are used for?

thanks a lot,

Thom

Re: location aware gps realtime (android)

ShellyGill1 — Wed, 30 Jul 2014 10:52:43 GMT

In the sample code, the value of zoomToWidth would only change if the accuracy of the GPS location changes; if I change the factor from 50 to 200 or 10 for example, I see this reflected in the map scale when the location initially changes. One thing that might be worth checking is that you map is initialized before you attempt to change the extent, and also make sure that your setExtent call is not conflicting with any specific zoom level or extent set when you create your MapView, maybe in the layout XML if you're using maptions in that. If you're having specific issues with setExtent not working it may be best if you started a new thread, and post some code that reproduces the specific problem.

The SpatialReference is used to project the Point from the spatial reference of the location point (WGS 84) to the map spatial reference - by default the spatial reference of the map, if using the Esri basemaps, would be WGS 1984 Web Mercator Auxiliary Sphere. You can find a list of all spatial references at these locations - this shows the codes (like 4326) along with the definition of the :

Mobile projected coordinate systems—ArcGIS Runtime SDK for Android | ArcGIS for Developers‌

Mobile geographic coordinate systems—ArcGIS Runtime SDK for Android | ArcGIS for Developers‌

If you're developing applications with spatial data but are not familiar with spatial references, coordinate systems, projections and the like, it is worth familiarising yourself with these concepts.

Re: location aware gps realtime (android)

ThomNgo — Thu, 31 Jul 2014 14:38:13 GMT

Thanks Shelly,

It works, the issue was that I also used the codes below, hence the accuracy never changed.

if (location.hasAccuracy()) {

accuracy = location.getAccuracy();

}

I commented them out and set accuracy = 400; to get the zoom scale I needed.

Now, we tested the Navigation autopan mode in Washington DC street yesterday and noticed that if 4G signal is low, the map stopped navigating and got stuck even after 4G signal was back. I had to reopen the app to get the map reinitialized in order to see it auto pan again. Is there any trick to solve this?

Re: location aware gps realtime (android)

ShellyGill1 — Tue, 05 Aug 2014 15:00:46 GMT

I tried to reproduce the issue you described, leaving the map in autopan Navigation mode, and moving between signal and no-signal areas, but I found when I returned to an area of signal, and started getting location updates again, the map updated. Are you sure this is not a different case of accidentally catching the map, meanving some navigation is done and then the auto-pan mode is turned to OFF again? And does your LocationDisplayManager.LocationListener.onLocationChanged still get called with location updates? Perhaps you can add yourself a test button that checks the mode, and re-set that if it's turned to off, and also try checking the LocationDisplayManager isStarted remains true as well. If you are still finding your problem, maybe you can try stopping and re-starting the LocationDisplayManager.

Re: location aware gps realtime (android)

ThomNgo — Wed, 05 Nov 2014 19:55:42 GMT

Shelly,

It could be device itself. Mine is Samsung Galaxy Note 10.1(2012 version) with Android 4.1.2. I've tried on 3-4 same devices, same thing happened. The Auto Pan got stuck, the map didn't pan while tablet moving. I tried to restart LocationDisplayManager but it still didn't work. The only way to get it to pan again is to get out and get back to the app. Also, we've tried on Samsung Galaxy Note 10.1 (2014 version) with Android 4.3, it is better. The entire trip (45 minutes on the bus) the map only get stuck once at the beginning, as compare to 2012 tablet which stucked more than 3-4 times.

Thanks a lot,

Thom