Basic GPS info - latitude & longitude

svebee · by **svebee** » Sat Apr 24, 2010 11:00 pm

Everything I need is basic GPS info - I need latitude and longitude (of my current position) in double type variables (so I can manipulate with them later).

What's the shortest way? I tried everything but always some error(s)

hkswaroop · by **hkswaroop** » Tue Apr 27, 2010 6:29 am

private LocationManager lm;
private LocationListener ll;

lm=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
ll=new LocationListener()
{
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
}
@Override
public void onProviderEnabled(String arg0) {
}

@Override
public void onProviderDisabled(String arg0) {
}

@Override
public void onLocationChanged(Location l) {
double lat=l.getLatitude();
double lon=l.getLongitude();

gp=new GeoPoint((int)(lat*1E6), (int)(lon*1E6)); mc.animateTo(gp);

}
};
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);

svebee · by **svebee** » Thu Apr 29, 2010 4:48 pm

This seems not working, why?

(It happens when I send coordinates to the emulator)

Code: Select all: 04-29 15:44:00.704: ERROR/AndroidRuntime(864): Uncaught handler: thread main exiting due to uncaught exception 04-29 15:44:00.713: ERROR/AndroidRuntime(864): java.lang.NullPointerException 04-29 15:44:00.713: ERROR/AndroidRuntime(864): at com.transport.NalazimSe$4.onLocationChanged(NalazimSe.java:284) 04-29 15:44:00.713: ERROR/AndroidRuntime(864): at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:179) 04-29 15:44:00.713: ERROR/AndroidRuntime(864): at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:112) 04-29 15:44:00.713: ERROR/AndroidRuntime(864): at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:128) 04-29 15:44:00.713: ERROR/AndroidRuntime(864): at android.os.Handler.dispatchMessage(Handler.java:99)

...

It says that error is on the line

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

mojGPS.setText(String.valueOf(Data));
Parsed in 0.029 seconds,  using GeSHi 1.0.8.4

*... means I removed buttons and similar stuff so the code is much more readable

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

public class NalazimSe extends Activity {
        
TextView mojGPS;
 
MapView mapView;
MapController mc;
GeoPoint p;
 
...
 
/** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.nalazimse);
 
  ...
 
  final LocationManager lm;
  final LocationListener ll;
 
  lm=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
  ll=new LocationListener()
  {
  @Override
  public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
  }
  @Override
  public void onProviderEnabled(String arg0) {
  }
 
  @Override
  public void onProviderDisabled(String arg0) {
  }
 
  @Override
  public void onLocationChanged(Location l) {
  double lat=l.getLatitude();
  double lon=l.getLongitude();
  String latitudeString = Double.toString(lat);
  String longitudeString = Double.toString(lon);
 
  p = new GeoPoint((int)(lat*1E6), (int)(lon*1E6));
  
  String Data ="";
  Data = Data + latitudeString + " - " + longitudeString + " n ";
  mojGPS.setText(String.valueOf(Data));
 
  }
  };
  lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
  
 }
}
 
Parsed in 0.034 seconds,  using GeSHi 1.0.8.4

Neondog · by **Neondog** » Thu Apr 29, 2010 7:36 pm

Do you think that if you set Data to equal something besides double quotations that it might help (i.e. "data goes here")? Maybe you are getting errors becuase you aren't converting the double's to a string before (or while) placing them in a string?

Basic GPS info - latitude & longitude

Basic GPS info - latitude & longitude

Who is online