thoerup/traininfo/LocationLookup.java

package dk.thoerup.traininfo;

import java.util.List;

import android.content.Context;
import android.location.Criteria;
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.Criteria;
7	import android.location.Location;
8	import android.location.LocationListener;
9	import android.location.LocationManager;
10	import android.os.Bundle;
11	import android.os.Handler;
12	import android.util.Log;
13
14
15	public class LocationLookup implements LocationListener{
16
17	LocationManager locManager;
18	Context cntx;
19	Handler hndl;
20
21	Location savedLocation = null;
22
23	boolean isSearching = false;
24	boolean hasGps;
25
26	public LocationLookup(Context c, Handler h) {
27	cntx = c;
28	hndl = h;
29	}
30
31
32	public boolean hasLocation() {
33	return savedLocation != null;
34	}
35
36	public Location getLocation()
37	{
38	return savedLocation;
39	}
40
41	public void locateStations() {
42
43	isSearching = true;
44
45	hasGps = false;
46	locManager = (LocationManager) cntx.getSystemService(Context.LOCATION_SERVICE);
47
48	List<String> providers = locManager.getProviders(true);
49
50	if (providers.size() > 0) {
51	for(String provider : providers) {
52	Log.i("Provider", ""+provider);
53	if (provider.equalsIgnoreCase("gps"))
54	hasGps = true;
55	locManager.requestLocationUpdates(provider, 0, 0, this);
56	}
57	} else {
58	// message that no suitable provider was found
59	hndl.sendEmptyMessage(StationList.NOPROVIDER);
60	}
61	}
62	@Override
63	public void onLocationChanged(Location location) {
64	if (isSearching == false)
65	return;
66
67	Log.i("Location", "Got location fix " + location.getLatitude() + ", " + location.getLongitude() + " accuracy=" + location.getAccuracy() + " provider=" +location.getProvider());
68
69
70	if (savedLocation == null \|\| location.getAccuracy() < savedLocation.getAccuracy())
71	savedLocation = new Location(location); //save a copy
72
73	if (hasGps) {
74	if (!location.getProvider().equals("gps")) {
75	return; // at least give the gps a chance
76	} else if (location.getAccuracy() > 256) {
77	return; //if we have a gps provider lets wait for a more precise fix
78	}
79
80	}
81	stopSearch();
82	hndl.sendEmptyMessage(StationList.GOTLOCATION);
83	}
84
85	public void stopSearch()
86	{
87	if (isSearching) {
88	isSearching = false;
89	locManager.removeUpdates(this);
90	}
91	}
92
93
94	@Override
95	public void onProviderDisabled(String provider) {
96	}
97
98
99	@Override
100	public void onProviderEnabled(String provider) {
101	}
102
103
104	@Override
105	public void onStatusChanged(String provider, int status, Bundle extras) {
106	// TODO Auto-generated method stub
107
108	}
109	}