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);
                                Location tmpLastKnown = locManager.getLastKnownLocation(provider);
                                if (tmpLastKnown != null) {
                                        saveLastKnownLocation(tmpLastKnown);
                                }
                        }
                } 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() > 512) {
                                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	torben	237	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	torben	319	public class LocationLookup implements LocationListener{
15
16	torben	237	LocationManager locManager;
17			Context cntx;
18			Handler hndl;
19
20	torben	488	Location lastKnownLocation = null;
21	torben	241	Location savedLocation = null;
22	torben	286
23	torben	336	boolean isSearching = false;
24	torben	286	boolean hasGps;
25	torben	241
26	torben	319	public LocationLookup(Context c, Handler h) {
27	torben	237	cntx = c;
28			hndl = h;
29			}
30
31	torben	285
32			public boolean hasLocation() {
33			return savedLocation != null;
34			}
35	torben	319
36			public Location getLocation()
37			{
38			return savedLocation;
39			}
40	torben	488
41			public Location getLastKnownLocation() {
42			return lastKnownLocation;
43			}
44	torben	237
45			public void locateStations() {
46	torben	336
47			isSearching = true;
48
49	torben	286	hasGps = false;
50	torben	237	locManager = (LocationManager) cntx.getSystemService(Context.LOCATION_SERVICE);
51	torben	286
52	torben	288	List<String> providers = locManager.getProviders(true);
53	torben	241
54	torben	286	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	torben	570	Location tmpLastKnown = locManager.getLastKnownLocation(provider);
61			if (tmpLastKnown != null) {
62			saveLastKnownLocation(tmpLastKnown);
63			}
64	torben	286	}
65	torben	237	} else {
66			// message that no suitable provider was found
67	torben	336	hndl.sendEmptyMessage(StationList.NOPROVIDER);
68	torben	237	}
69			}
70			@Override
71			public void onLocationChanged(Location location) {
72	torben	336	if (isSearching == false)
73			return;
74
75	torben	237	Log.i("Location", "Got location fix " + location.getLatitude() + ", " + location.getLongitude() + " accuracy=" + location.getAccuracy() + " provider=" +location.getProvider());
76	torben	336
77	torben	237
78	torben	286	if (savedLocation == null \|\| location.getAccuracy() < savedLocation.getAccuracy())
79			savedLocation = new Location(location); //save a copy
80	torben	241
81	torben	286	if (hasGps) {
82			if (!location.getProvider().equals("gps")) {
83			return; // at least give the gps a chance
84	torben	948	} else if (location.getAccuracy() > 512) {
85	torben	286	return; //if we have a gps provider lets wait for a more precise fix
86			}
87	torben	237
88	torben	286	}
89	torben	336	stopSearch();
90			hndl.sendEmptyMessage(StationList.GOTLOCATION);
91	torben	241	}
92	torben	336
93	torben	488	private void saveLastKnownLocation(Location loc) {
94			if (lastKnownLocation == null) {
95			lastKnownLocation = loc;
96			} else {
97			if (loc.getTime() > lastKnownLocation.getTime()) {//if loc is more recent than saved
98			lastKnownLocation = loc;
99			}
100			}
101			}
102
103	torben	336	public void stopSearch()
104			{
105			if (isSearching) {
106			isSearching = false;
107			locManager.removeUpdates(this);
108			}
109			}
110	torben	319
111	torben	237
112			@Override
113			public void onProviderDisabled(String provider) {
114			}
115
116
117			@Override
118			public void onProviderEnabled(String provider) {
119			}
120
121
122			@Override
123			public void onStatusChanged(String provider, int status, Bundle extras) {
124			// TODO Auto-generated method stub
125
126			}
127			}