thoerup/traininfo/LocationLookup.java

package dk.thoerup.traininfo;

import java.util.List;

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


public class LocationLookup implements LocationListener, GpsStatus.Listener {
        
        public enum LookupStates {
                GOTLOCATION,
                NOPROVIDER,
                STARTED,
                IDLE
        }

        private LocationManager locManager;
        private Context cntx;

        private Location lastKnownLocation = null;
        private Location savedLocation = null;
        private int satCount;
        
        private boolean hasGps;
        
        private LookupStates state;
        
        private long startTime;

        public LocationLookup(Context c) {
                state = LookupStates.IDLE;
                cntx = c;
        }
        
        
        public boolean hasLocation() {
                return savedLocation != null;
        }
        
        public Location getLocation()
        {
                return savedLocation;
        }
        
        public boolean hasGps() {
                return hasGps;
        }
        
        public int getSatCount() {
                return satCount;
        }
        
        public LookupStates getState() {
                return state;
        }
        
        public Location getLastKnownLocation() {
                return lastKnownLocation;
        }
        
        public long elapsedTime() {
                long now = android.os.SystemClock.elapsedRealtime();
                
                return now - startTime;
        }

        public void locateStations() {
                
                state = LookupStates.STARTED;
                
                hasGps = false;
                locManager = (LocationManager) cntx.getSystemService(Context.LOCATION_SERVICE);
                satCount = 0;
                
                startTime = android.os.SystemClock.elapsedRealtime(); 

                List<String> providers = locManager.getProviders(true);         
                
                if (providers.size() > 0) {
                        for(String provider : providers) {
                                Log.i("Provider", ""+provider);
                                if (provider.equalsIgnoreCase("gps")) {
                                        locManager.addGpsStatusListener(this);
                                        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);
                        state = LookupStates.NOPROVIDER;
                        
                }
        }
        @Override
        public void onLocationChanged(Location location) {              
                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();
                state = LookupStates.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 (state == LookupStates.STARTED) {
                        state = LookupStates.IDLE;
                        locManager.removeGpsStatusListener(this);
                        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

        }


        @Override //GpsStatus.Listener
        public void onGpsStatusChanged(int event) {
                if (event == GpsStatus.GPS_EVENT_SATELLITE_STATUS) {
                        int count = 0;
                        GpsStatus status =  locManager.getGpsStatus(null);
                        for (GpsSatellite sat : status.getSatellites()) {
                                count ++;
                        }                       
                        
                        satCount = count;
                }
                
        }
}
1	package dk.thoerup.traininfo;
2
3	import java.util.List;
4
5	import android.content.Context;
6	import android.location.GpsSatellite;
7	import android.location.GpsStatus;
8	import android.location.Location;
9	import android.location.LocationListener;
10	import android.location.LocationManager;
11	import android.os.Bundle;
12	import android.util.Log;
13
14
15	public class LocationLookup implements LocationListener, GpsStatus.Listener {
16
17	public enum LookupStates {
18	GOTLOCATION,
19	NOPROVIDER,
20	STARTED,
21	IDLE
22	}
23
24	private LocationManager locManager;
25	private Context cntx;
26
27	private Location lastKnownLocation = null;
28	private Location savedLocation = null;
29	private int satCount;
30
31	private boolean hasGps;
32
33	private LookupStates state;
34
35	private long startTime;
36
37	public LocationLookup(Context c) {
38	state = LookupStates.IDLE;
39	cntx = c;
40	}
41
42
43	public boolean hasLocation() {
44	return savedLocation != null;
45	}
46
47	public Location getLocation()
48	{
49	return savedLocation;
50	}
51
52	public boolean hasGps() {
53	return hasGps;
54	}
55
56	public int getSatCount() {
57	return satCount;
58	}
59
60	public LookupStates getState() {
61	return state;
62	}
63
64	public Location getLastKnownLocation() {
65	return lastKnownLocation;
66	}
67
68	public long elapsedTime() {
69	long now = android.os.SystemClock.elapsedRealtime();
70
71	return now - startTime;
72	}
73
74	public void locateStations() {
75
76	state = LookupStates.STARTED;
77
78	hasGps = false;
79	locManager = (LocationManager) cntx.getSystemService(Context.LOCATION_SERVICE);
80	satCount = 0;
81
82	startTime = android.os.SystemClock.elapsedRealtime();
83
84	List<String> providers = locManager.getProviders(true);
85
86	if (providers.size() > 0) {
87	for(String provider : providers) {
88	Log.i("Provider", ""+provider);
89	if (provider.equalsIgnoreCase("gps")) {
90	locManager.addGpsStatusListener(this);
91	hasGps = true;
92	}
93
94	locManager.requestLocationUpdates(provider, 0, 0, this);
95	Location tmpLastKnown = locManager.getLastKnownLocation(provider);
96	if (tmpLastKnown != null) {
97	saveLastKnownLocation(tmpLastKnown);
98	}
99	}
100	} else {
101	// message that no suitable provider was found
102	//hndl.sendEmptyMessage(StationList.NOPROVIDER);
103	state = LookupStates.NOPROVIDER;
104
105	}
106	}
107	@Override
108	public void onLocationChanged(Location location) {
109	Log.i("Location", "Got location fix " + location.getLatitude() + ", " + location.getLongitude() + " accuracy=" + location.getAccuracy() + " provider=" +location.getProvider());
110
111
112	if (savedLocation == null \|\| location.getAccuracy() < savedLocation.getAccuracy())
113	savedLocation = new Location(location); //save a copy
114
115	if (hasGps) {
116	if (!location.getProvider().equals("gps")) {
117	return; // at least give the gps a chance
118	} else if (location.getAccuracy() > 512) {
119	return; //if we have a gps provider lets wait for a more precise fix
120	}
121
122	}
123	stopSearch();
124	state = LookupStates.GOTLOCATION;
125
126	}
127
128	private void saveLastKnownLocation(Location loc) {
129	if (lastKnownLocation == null) {
130	lastKnownLocation = loc;
131	} else {
132	if (loc.getTime() > lastKnownLocation.getTime()) {//if loc is more recent than saved
133	lastKnownLocation = loc;
134	}
135	}
136	}
137
138	public void stopSearch()
139	{
140	if (state == LookupStates.STARTED) {
141	state = LookupStates.IDLE;
142	locManager.removeGpsStatusListener(this);
143	locManager.removeUpdates(this);
144	}
145	}
146
147
148	@Override
149	public void onProviderDisabled(String provider) {
150	}
151
152
153	@Override
154	public void onProviderEnabled(String provider) {
155	}
156
157
158	@Override
159	public void onStatusChanged(String provider, int status, Bundle extras) {
160	// TODO Auto-generated method stub
161
162	}
163
164
165	@Override //GpsStatus.Listener
166	public void onGpsStatusChanged(int event) {
167	if (event == GpsStatus.GPS_EVENT_SATELLITE_STATUS) {
168	int count = 0;
169	GpsStatus status = locManager.getGpsStatus(null);
170	for (GpsSatellite sat : status.getSatellites()) {
171	count ++;
172	}
173
174	satCount = count;
175	}
176
177	}
178	}