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.os.Handler;
import android.os.Message;
import android.util.Log;


public class LocationLookup implements LocationListener, GpsStatus.Listener {

        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")) {
                                        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);
                        hndl.sendEmptyMessage(StationList.LookupStates.NOPROVIDER.ordinal());
                        
                }
        }
        @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.LookupStates.GOTLOCATION.ordinal());
        }
        
        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.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 ++;
                        }
                        
                        Message msg = new Message();
                        msg.what = StationList.LookupStates.GPS_SAT_COUNT.ordinal();
                        msg.arg1 = count;
                        hndl.sendMessage(msg);
                }
                
        }
}
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.os.Handler;
13	import android.os.Message;
14	import android.util.Log;
15
16
17	public class LocationLookup implements LocationListener, GpsStatus.Listener {
18
19	LocationManager locManager;
20	Context cntx;
21	Handler hndl;
22
23	Location lastKnownLocation = null;
24	Location savedLocation = null;
25
26	boolean isSearching = false;
27	boolean hasGps;
28
29	public LocationLookup(Context c, Handler h) {
30	cntx = c;
31	hndl = h;
32	}
33
34
35	public boolean hasLocation() {
36	return savedLocation != null;
37	}
38
39	public Location getLocation()
40	{
41	return savedLocation;
42	}
43
44	public Location getLastKnownLocation() {
45	return lastKnownLocation;
46	}
47
48	public void locateStations() {
49
50	isSearching = true;
51
52	hasGps = false;
53	locManager = (LocationManager) cntx.getSystemService(Context.LOCATION_SERVICE);
54
55	List<String> providers = locManager.getProviders(true);
56
57	if (providers.size() > 0) {
58	for(String provider : providers) {
59	Log.i("Provider", ""+provider);
60	if (provider.equalsIgnoreCase("gps")) {
61	locManager.addGpsStatusListener(this);
62	hasGps = true;
63	}
64
65	locManager.requestLocationUpdates(provider, 0, 0, this);
66	Location tmpLastKnown = locManager.getLastKnownLocation(provider);
67	if (tmpLastKnown != null) {
68	saveLastKnownLocation(tmpLastKnown);
69	}
70	}
71	} else {
72	// message that no suitable provider was found
73	//hndl.sendEmptyMessage(StationList.NOPROVIDER);
74	hndl.sendEmptyMessage(StationList.LookupStates.NOPROVIDER.ordinal());
75
76	}
77	}
78	@Override
79	public void onLocationChanged(Location location) {
80	if (isSearching == false)
81	return;
82
83	Log.i("Location", "Got location fix " + location.getLatitude() + ", " + location.getLongitude() + " accuracy=" + location.getAccuracy() + " provider=" +location.getProvider());
84
85
86	if (savedLocation == null \|\| location.getAccuracy() < savedLocation.getAccuracy())
87	savedLocation = new Location(location); //save a copy
88
89	if (hasGps) {
90	if (!location.getProvider().equals("gps")) {
91	return; // at least give the gps a chance
92	} else if (location.getAccuracy() > 512) {
93	return; //if we have a gps provider lets wait for a more precise fix
94	}
95
96	}
97	stopSearch();
98	hndl.sendEmptyMessage(StationList.LookupStates.GOTLOCATION.ordinal());
99	}
100
101	private void saveLastKnownLocation(Location loc) {
102	if (lastKnownLocation == null) {
103	lastKnownLocation = loc;
104	} else {
105	if (loc.getTime() > lastKnownLocation.getTime()) {//if loc is more recent than saved
106	lastKnownLocation = loc;
107	}
108	}
109	}
110
111	public void stopSearch()
112	{
113	if (isSearching) {
114	isSearching = false;
115	locManager.removeGpsStatusListener(this);
116	locManager.removeUpdates(this);
117	}
118	}
119
120
121	@Override
122	public void onProviderDisabled(String provider) {
123	}
124
125
126	@Override
127	public void onProviderEnabled(String provider) {
128	}
129
130
131	@Override
132	public void onStatusChanged(String provider, int status, Bundle extras) {
133	// TODO Auto-generated method stub
134
135	}
136
137
138	@Override //GpsStatus.Listener
139	public void onGpsStatusChanged(int event) {
140	if (event == GpsStatus.GPS_EVENT_SATELLITE_STATUS) {
141	int count = 0;
142	GpsStatus status = locManager.getGpsStatus(null);
143	for (GpsSatellite sat : status.getSatellites()) {
144	count ++;
145	}
146
147	Message msg = new Message();
148	msg.what = StationList.LookupStates.GPS_SAT_COUNT.ordinal();
149	msg.arg1 = count;
150	hndl.sendMessage(msg);
151	}
152
153	}
154	}