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 lastKnownLocation = null;
        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 Location getLastKnownLocation() {
                return lastKnownLocation;
        }

        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);
                                
                                saveLastKnownLocation(locManager.getLastKnownLocation(provider));
                        }
                } 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);
        }
        
        private void saveLastKnownLocation(Location loc) {
                if (lastKnownLocation == null) { 
                        lastKnownLocation = loc; 
                } else {
                        if (loc.getTime() > lastKnownLocation.getTime()) {//if loc is more recent than saved
                                lastKnownLocation = loc;
                        }
                }
        }
        
        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 lastKnownLocation = null;
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 Location getLastKnownLocation() {
42	return lastKnownLocation;
43	}
44
45	public void locateStations() {
46
47	isSearching = true;
48
49	hasGps = false;
50	locManager = (LocationManager) cntx.getSystemService(Context.LOCATION_SERVICE);
51
52	List<String> providers = locManager.getProviders(true);
53
54	if (providers.size() > 0) {
55	for(String provider : providers) {
56	Log.i("Provider", ""+provider);
57	if (provider.equalsIgnoreCase("gps"))
58	hasGps = true;
59	locManager.requestLocationUpdates(provider, 0, 0, this);
60
61	saveLastKnownLocation(locManager.getLastKnownLocation(provider));
62	}
63	} else {
64	// message that no suitable provider was found
65	hndl.sendEmptyMessage(StationList.NOPROVIDER);
66	}
67	}
68	@Override
69	public void onLocationChanged(Location location) {
70	if (isSearching == false)
71	return;
72
73	Log.i("Location", "Got location fix " + location.getLatitude() + ", " + location.getLongitude() + " accuracy=" + location.getAccuracy() + " provider=" +location.getProvider());
74
75
76	if (savedLocation == null \|\| location.getAccuracy() < savedLocation.getAccuracy())
77	savedLocation = new Location(location); //save a copy
78
79	if (hasGps) {
80	if (!location.getProvider().equals("gps")) {
81	return; // at least give the gps a chance
82	} else if (location.getAccuracy() > 256) {
83	return; //if we have a gps provider lets wait for a more precise fix
84	}
85
86	}
87	stopSearch();
88	hndl.sendEmptyMessage(StationList.GOTLOCATION);
89	}
90
91	private void saveLastKnownLocation(Location loc) {
92	if (lastKnownLocation == null) {
93	lastKnownLocation = loc;
94	} else {
95	if (loc.getTime() > lastKnownLocation.getTime()) {//if loc is more recent than saved
96	lastKnownLocation = loc;
97	}
98	}
99	}
100
101	public void stopSearch()
102	{
103	if (isSearching) {
104	isSearching = false;
105	locManager.removeUpdates(this);
106	}
107	}
108
109
110	@Override
111	public void onProviderDisabled(String provider) {
112	}
113
114
115	@Override
116	public void onProviderEnabled(String provider) {
117	}
118
119
120	@Override
121	public void onStatusChanged(String provider, int status, Bundle extras) {
122	// TODO Auto-generated method stub
123
124	}
125	}