thoerup/traininfo/LocationLookup.java

package dk.thoerup.traininfo;

import java.util.List;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;


public class LocationLookup implements LocationListener{

        LocationManager locManager;
        Context cntx;
        Handler hndl;

        Location savedLocation = null;
        
        boolean isSearching = false;
        boolean hasGps;

        public LocationLookup(Context c, Handler h) {
                cntx = c;
                hndl = h;
        }
        
        
        public boolean hasLocation() {
                return savedLocation != null;
        }
        
        public Location getLocation()
        {
                return savedLocation;
        }

        public void locateStations() {
                
                isSearching = true;
                
                hasGps = false;
                locManager = (LocationManager) cntx.getSystemService(Context.LOCATION_SERVICE);

                List<String> providers = locManager.getProviders(true);         
                
                if (providers.size() > 0) {
                        for(String provider : providers) {
                                Log.i("Provider", ""+provider);
                                if (provider.equalsIgnoreCase("gps"))
                                        hasGps = true;
                                locManager.requestLocationUpdates(provider, 0, 0, this);
                        }
                } else {
                        // message that no suitable provider was found
                        hndl.sendEmptyMessage(StationList.NOPROVIDER);
                }
        }
        @Override
        public void onLocationChanged(Location location) {
                if (isSearching == false)
                        return;
                
                Log.i("Location", "Got location fix " + location.getLatitude() + ", " + location.getLongitude() + " accuracy=" + location.getAccuracy() + " provider=" +location.getProvider());
                

                if (savedLocation == null || location.getAccuracy() < savedLocation.getAccuracy())
                        savedLocation = new Location(location); //save a copy
                
                if (hasGps) {
                        if (!location.getProvider().equals("gps")) {
                                return; // at least give the gps a chance
                        } else if (location.getAccuracy() > 256) {
                                return; //if we have a gps provider lets wait for a more precise fix
                        }

                }
                stopSearch();
                hndl.sendEmptyMessage(StationList.GOTLOCATION);
        }
        
        public void stopSearch()
        {
                if (isSearching) {
                        isSearching = false;
                        locManager.removeUpdates(this);
                }
        }


        @Override
        public void onProviderDisabled(String provider) {
        }


        @Override
        public void onProviderEnabled(String provider) {
        }


        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
                // TODO Auto-generated method stub

        }
}
1	package dk.thoerup.traininfo;
2
3	import java.util.List;
4
5	import android.content.Context;
6	import android.location.Location;
7	import android.location.LocationListener;
8	import android.location.LocationManager;
9	import android.os.Bundle;
10	import android.os.Handler;
11	import android.util.Log;
12
13
14	public class LocationLookup implements LocationListener{
15
16	LocationManager locManager;
17	Context cntx;
18	Handler hndl;
19
20	Location savedLocation = null;
21
22	boolean isSearching = false;
23	boolean hasGps;
24
25	public LocationLookup(Context c, Handler h) {
26	cntx = c;
27	hndl = h;
28	}
29
30
31	public boolean hasLocation() {
32	return savedLocation != null;
33	}
34
35	public Location getLocation()
36	{
37	return savedLocation;
38	}
39
40	public void locateStations() {
41
42	isSearching = true;
43
44	hasGps = false;
45	locManager = (LocationManager) cntx.getSystemService(Context.LOCATION_SERVICE);
46
47	List<String> providers = locManager.getProviders(true);
48
49	if (providers.size() > 0) {
50	for(String provider : providers) {
51	Log.i("Provider", ""+provider);
52	if (provider.equalsIgnoreCase("gps"))
53	hasGps = true;
54	locManager.requestLocationUpdates(provider, 0, 0, this);
55	}
56	} else {
57	// message that no suitable provider was found
58	hndl.sendEmptyMessage(StationList.NOPROVIDER);
59	}
60	}
61	@Override
62	public void onLocationChanged(Location location) {
63	if (isSearching == false)
64	return;
65
66	Log.i("Location", "Got location fix " + location.getLatitude() + ", " + location.getLongitude() + " accuracy=" + location.getAccuracy() + " provider=" +location.getProvider());
67
68
69	if (savedLocation == null \|\| location.getAccuracy() < savedLocation.getAccuracy())
70	savedLocation = new Location(location); //save a copy
71
72	if (hasGps) {
73	if (!location.getProvider().equals("gps")) {
74	return; // at least give the gps a chance
75	} else if (location.getAccuracy() > 256) {
76	return; //if we have a gps provider lets wait for a more precise fix
77	}
78
79	}
80	stopSearch();
81	hndl.sendEmptyMessage(StationList.GOTLOCATION);
82	}
83
84	public void stopSearch()
85	{
86	if (isSearching) {
87	isSearching = false;
88	locManager.removeUpdates(this);
89	}
90	}
91
92
93	@Override
94	public void onProviderDisabled(String provider) {
95	}
96
97
98	@Override
99	public void onProviderEnabled(String provider) {
100	}
101
102
103	@Override
104	public void onStatusChanged(String provider, int status, Bundle extras) {
105	// TODO Auto-generated method stub
106
107	}
108	}