How mobile phones are positioned

GPS: triangle positioning, positioning accuracy, the minimum accuracy of about 15 meters, shortcomings--positioning speed slow, boot time long base station: the use of triangular positioning method, positioning fast, low positioning accuracy of 30 meters to 2 km network: using IP to locate; AGAP: Network Assistant location System ; now locate on the phone in this way; Add permissions to the manifest file:

  
 

   
  

  
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> 注：最佳定位方式通过GPS、
   
  

  
 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>注：网络定位
   
  

  
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION"/>注：车载系统定位
  
 

Permissions annotations: Allows an app to access precise location from location sources such as GPS, cell towers, and Wi-Fi. (Android.permission.ACCESS_FINE_LOCATION)allows an app to access approximate location derived from network location sources such as cell towers and Wi-Fi (Android.permission.ACCESS_COARSE_LOCATION)allows an application-to-create mock location providers for testing (Android.permission.ACCESS_MOCK_LOCATION)
Locating api:1 and getting Locationmanager objects through system services

 
   
  

  
    
   
LocationManager lm=(LocationManager)getSysyrmService
 
   
  

2. By callingRequestlocationupdates (Stringprovider, long mintime, float mindistance,Locationlistenerlistener) to achieve positioning

 
   
  

  
    
   
lm.requestLocationUpdates("gps",0,0,new MyLocationLiseter());
 
   
  

Parameter comment:    provider: Get location information: gps\ base station \ Network    mintime: At least how long it takes to get information back    mindistance: At least move multiple long distances to regain information    Listener: Listener for position changeCustomizing the Locationlistener and serializing specific positioning information to a local

  
 

   
  

  
private class MyLocationLiseter implements LocationListener{
   
  

  

   
  

  
/**
   
  

  
 * 位置发生变化调用这个方法
   
  

  
 */
   
  

  
@Override
   
  

  
public void onLocationChanged(Location location) {
   
  

  
//维度
   
  

  
double w = location.getLatitude();
   
  

  
//经度
   
  

  
double j = location.getLongitude();
   
  

  
// 精确度
   
  

  
double a = location.getAccuracy();
   
  

  
String l = w+","+j+ "," +a;
   
  

  
System.out.println("=================="+l);
   
  

  

   
  

  
SharedPreferences sp = getSharedPreferences("config", Context.MODE_PRIVATE);
   
  

  
Editor editor = sp.edit();
   
  

  
editor.putString("location", l);
   
  

  
editor.commit();
   
  

  
}
   
  

  

   
  

  
/**
   
  

  
 * 某一种定位方式的状态发生变化调用这个方法
   
  

  
 * 打开--关闭
   
  

  
 * 关闭--打开
   
  

  
 */
   
  

  
@Override
   
  

  
public void onStatusChanged(String provider, int status, Bundle extras) {
   
  

  

   
  

  
}
   
  

  

   
  

  
/**
   
  

  
 * 某一种定位方式的可用时发生变化时调用这个方法
   
  

  
 * 不可用--可用
   
  

  
 */
   
  

  
@Override
   
  

  
public void onProviderEnabled(String provider) {
   
  

  
// TODO Auto-generated method stub
   
  

  

   
  

  
}
   
  

  
/**
   
  

  
 * 某一种定位方式的不可用时发生变化时调用这个方法
   
  

  
 * 可用--不可用
   
  

  
 */
   
  

  
@Override
   
  

  
public void onProviderDisabled(String provider) {
   
  

  
// TODO Auto-generated method stub
   
  

  

   
  

  
}
   
  

  

   
  

  
}
  
 

From for notes (Wiz)

How mobile phones are positioned