creating a map to detect your current position

[chisom dike Onwuegbuzie]

please someone should help me look into this code i edited it a little from the developers guide to match the form i created in gui builder.  please i need the help i can get please.

protected void beforeMap(Form f) {

try {
//get the current location from the Location API
Location loc = LocationManager.getLocationManager().getCurrentLocation();
Coord lastLocation = new Coord(loc.getLatitude(), loc.getLongtitude());

final InfiniteProgress progress = new InfiniteProgress();
final Dialog dlg =progress.showInifiniteBlocking();

final ConnectionRequest req = new ConnectionRequest() {
@Override
protected void readResponse(InputStream input) throws IOException {
JSONParser p = new JSONParser();
Hashtable h = p.parse(new InputStreamReader(input));
// "status" : "REQUEST_DENIED"
String response = (String)h.get("status");
if(response.equals("REQUEST_DENIED")){
System.out.println("make sure to obtain a key from "
+ "https://developers.google.com/maps/documentation/places/");

Dialog.show("Info", "make sure to obtain an application key from "
+ "google places api's"
, "Ok", null);
return;
}
final Vector v = (Vector) h.get("results");
Image im = Image.createImage("/red_pin.png");
PointsLayer pl = new PointsLayer();
pl.setPointIcon(im);
pl.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
PointLayer p = (PointLayer) evt.getSource();
System.out.println("pressed " + p);
Dialog.show("Details", "" + p.getName(), "Ok", null);
}
});
for (int i = 0; i < v.size(); i++) {

Hashtable entry = (Hashtable) v.elementAt(i);
Hashtable geo = (Hashtable) entry.get("geometry");
Hashtable loc = (Hashtable) geo.get("location");
Double lat = (Double) loc.get("lat");
Double lng = (Double) loc.get("lng");
Image img = Image.createImage("/blue_pin.png");

PointLayer point = new PointLayer(new Coord(lat.doubleValue(),
lng.doubleValue()),
(String) entry.get("name"), img);
point.setIcon(img);
point.setDisplayName(true);
pl.addPoint(point);
}

findMc().addLayer(pl);
findMc().zoomToLayers();
}
};
req.setUrl("https://maps.googleapis.com/maps/api/place/search/json");
req.setPost(false);
req.addArgument("location", "" + loc.getLatitude() + "," + loc.getLongtitude());
req.addArgument("radius", "500");
req.addArgument("types", "food");
req.addArgument("sensor", "false");
//get your own key from https://developers.google.com/maps/documentation/places/
//and replace it here.
String key = "yourAPIKey";
req.addArgument("key", key);
NetworkManager.getInstance().addToQueue(req);
}
catch (IOException ex) {
}
}

[Shai Almog]

What's the issue you are experiencing?
Notice that all the code in readResponse() is incorrect since that method is invoked on a separate thread. You should write GUI code only on the EDT and move all that code to postResponse(); You should also use find*() cautiously since the form might have changed, either pass in the form or check that the value isn't null.

[Shai Almog]

Oh and getLocation() is incorrect.
You need to bind a location listener and wait for a location to be available. You should search this form where we give ample examples of proper usage of the API.

[ebelin...@agilastic.de]

i.e. look at this snipped:

LocationManager l = LocationManager.getLocationManager(); 

l.setLocationListener(new LocationListener() {

                    public void locationUpdated(Location loc) {                        

                        if (Math.abs(loc.getLongitude())  > 0) {

                            Storage.getInstance().writeObject("Altitude", loc.getAltitude());

                            Storage.getInstance().writeObject("Latitude", loc.getLatitude());

                            Storage.getInstance().writeObject("Longitude", loc.getLongitude());

                            System.out.println(Storage.getInstance().readObject("Altitude").toString());

                            System.out.println(Storage.getInstance().readObject("Latitude").toString());

                            System.out.println(Storage.getInstance().readObject("Longitude").toString());

                            System.out.println("UPDATE ");

                        }

                    }

                    public void providerStateChanged(int newState) {

                    }

                }); 

[chisom dike Onwuegbuzie]

shai thank you for your response but im kind of new to this, please can you relay it to me in code?

[chisom dike Onwuegbuzie]

thanks ebelin but still need more eye opener on this 

[Shai Almog]

Please be more specific. I can't guess what you don't understand.

[chisom dike Onwuegbuzie]

On Monday, October 21, 2013 7:02:09 AM UTC+1, Shai Almog wrote:

Please be more specific. I can't guess what you don't understand.

i dont fully understand the code that will get the current location of a dvice using google map

[Shai Almog]

I've added a simplified method getCurrentLocationSync() to the LocationManager. It will be available in the next library update and should be easier to use.
You can search the forum for LocationManager to understand how to use this class.

[ebelin...@agilastic.de]

 Hey, 

take a look at my dirty sample code: 

https://github.com/agilastic/GPSPosition-Openstreetmap-Demo

You can also run the app on Android:

https://play.google.com/store/apps/details?id=com.agilastic.GPSPosition

It's not perfect.... just my first app with CN1...

[chisom dike Onwuegbuzie]

ok

[kevin....@gmail.com]

Got the new library, and the getCurrentLocationSync() works as advertised.  I am a little confused about how I should be using it though.  When the gps in my phone is on, and I'm outdoors, it works as expected.  However, if I am indoors, and I call it, it loops infinitely, with the gps icon flashing in the status bar.  I have tried using the locationmanager flags of AVAILABLE and TEMP_UNAVAILABLE, and they don't really seem to make a difference.

What status is returned by the LocationManager if you are indoors and the gps is turned on?  What do I do to resort to WiFi geolocation if I can't get a GPS signal?

[Shai Almog]

Makes sense, we probably need to add a timeout option to the API.
I'll add it to the next update.

[kevin....@gmail.com]

If I may be so bold, an overridden function that can take a timeout as a parameter?

Does the LocationManager only use GPS?  Or does it also use WiFi location services?

[Shai Almog]

Overloaded method. getCurrentLocationSync(), getCurrentLocationSync(long).

I think it currently only uses GPS. We should migrate it to the new google location API's when we get the chance.

[kevin....@gmail.com]

I think my CN1 library is up-to-date in NetBeans, but the getCurrentLocationSync(long) function isn't there yet?  When will that update be released?

[Shai Almog]

I think it should be in the next update which we should release this week.

[Akintayo Olusegun]

Hi Shai,

Can you please reply this thread once this update is available. 

Thanks.

[kevin....@gmail.com]

Thanks for the update Shai, looking forward to it.