Android GPS-Location
I wrote this LocationHelper class to get the gps (or wifi) location:
public class LocationHelper {
private MyLocation location;
Context context;
Timer timer;
LocationManager lm;
boolean gps_enabled=false;
boolean network_enabled=false;
ILocation activity;
private LocationHelper(){
}
public LocationHelper(Context context){
this();
this.context = context;
location = new MyLocation();
}
public LocationHelper(Context context, ILocation activity){
this(context);
this.activity = activity;
}
LocationListener locationListenerGps = new LocationListener() {
public void onLocationChanged(Location location) {
timer.cancel();
gotLocation(location);
// gps will keep going
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) {
timer.cancel();
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()){
gotLocation(gps_loc);
}else{
gotLocation(net_loc);
}
return;
}
if(gps_loc!=null){
gotLocation(gps_loc);
return;
}
if(net_loc!=null){
gotLocation(net_loc);
return;
}
gotLocation(null);
}
}
private void gotLocation(Location newLocation){
if(newLocation != null){
if(activity != null){
activity.updateDirectionOnObjects(newLocation);
}
location.setLatitude(newLocation.getLatitude());
location.setLongitude(newLocation.getLongitude());
}
}
public MyLocation getLocation() {
return location;
}
public void register() {
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){
if(gps_enabled){
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 12000, 0, locationListenerGps);
}
if(network_enabled){
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
}
timer=new Timer();
timer.schedule(new GetLastLocation(), 20000);
}
}
public void unregister() {
lm.removeUpdates(locationListenerGps);
lm.removeUpdates(locationListenerNetwork);
}
}
MyLocation is a simple model class:
public class MyLocation {
private double latitude;
private double longitude;
public double getLatitude() {
return latitude;
}
public void setLatitude(double latitude) {
this.latitude = latitude;
}
public double getLongitude() {
return longitude;
}
public void setLongitude(double longitude) {
this.longitude = longitude;
}
}
ILocation is a interface that can be implemented if you want a feedback when the location is found:
public interface ILocation {
public void updateDirectionOnObjects(Location location);
}
To use it you will have to create a LocationHelper object:
private LocationHelper locationHelper;
In the onCreate-Method:
locationHelper = new LocationHelper(this);
//If you want to use the feedback-method:
//locationHelper = new LocationHelper(this,this);
//Note: you will have to implement ILocation for this to work!
--
In the onResume-Method (not onCreate!) register the listener:
locationHelper.register();
In the onPause-Method unregister the listener:
locationHelper.unregister();
If you didn't implement ILocation you can get the current Location with following call:
locationHelper.getLocation();
Written by Dylan Marriott
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