【Based Android】android通过criteria选择合适的地理位置服务

 1 /*  LocationActivity.java
 2  *  @author octobershiner
 3  *  2011 7 24
 4  *  SE.HIT
 5  *  利用Criteria选择最优的位置服务，演示定位用户的位置并且监听位置变化的代码
 6  * */
 7 package uni.location;
 8 
 9 import android.app.Activity;
10 import android.content.Context;
11 import android.location.Criteria;
12 import android.location.Location;
13 import android.location.LocationListener;
14 import android.location.LocationManager;
15 import android.os.Bundle;
16 import android.os.Vibrator;
17 import android.util.Log;
18 import android.widget.TextView;
19 
20 public class LocationActivity extends Activity {
21     /** Called when the activity is first created. */
22     //创建lcoationManager对象
23     private LocationManager manager;
24     private static final String TAG = "LOCATION DEMO";
25     @Override
26     public void onCreate(Bundle savedInstanceState) {
27         super.onCreate(savedInstanceState);
28         setContentView(R.layout.main);
29         //获取系统的服务，
30         manager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
31         //创建一个criteria对象
32         Criteria criteria = new Criteria();   
33         criteria.setAccuracy(Criteria.ACCURACY_COARSE);
34         //设置不需要获取海拔方向数据
35         criteria.setAltitudeRequired(false);   
36         criteria.setBearingRequired(false);
37         //设置允许产生资费
38         criteria.setCostAllowed(true);   
39         //要求低耗电
40         criteria.setPowerRequirement(Criteria.POWER_LOW);   
41         String provider = manager.getBestProvider(criteria, false);   
42         Log.i(TAG, "we choose "+ provider);
43         Location location = manager.getLastKnownLocation(provider);
44         //第一次获得设备的位置
45         updateLocation(location);   
46         //重要函数，监听数据测试
47         manager.requestLocationUpdates(provider, 6000, 10,   
48                        locationListener);   
49                        
50     }  
51     
52     //创建一个事件监听器
53    private final LocationListener locationListener = new LocationListener() {   
54             public void onLocationChanged(Location location) {   
55             updateLocation(location);   
56             }   
57             public void onProviderDisabled(String provider){
58                 updateLocation(null);   
59                 Log.i(TAG, "Provider now is disabled..");
60             }   
61             public void onProviderEnabled(String provider){
62                 Log.i(TAG, "Provider now is enabled..");
63             }   
64             public void onStatusChanged(String provider, int status,Bundle extras){ }   
65     };   
66     
67 //获取用户位置的函数，利用Log显示
68     private void updateLocation(Location location) {   
69             String latLng;    
70             if (location != null) {  
71             double lat = location.getLatitude();   
72             double lng = location.getLongitude();
73             
74             latLng = "Latitude:" + lat + "  Longitude:" + lng;   
75             } else {   
76             latLng = "Can't access your location";
77             }
78             Log.i(TAG, "The location has changed..");
79             Log.i(TAG, "Your Location:" +latLng);
80     }
81     
82 }
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