Android gets the geographic location and analyzes the specific City

Java code
/**
* Get the city name through GPS
*
* @ Param Context
* An activity
* @ Return city name
*/
Public static string getcityname (context ){
Locationmanager;
String contextstring = context. location_service;
Locationmanager = (locationmanager) Context. getsystemservice (contextstring );
Criteria = new criteria ();
Criteria. setaccuracy (criteria. accuracy_fine );
Criteria. setaltituderequired (false );
Criteria. setbearingrequired (false );
Criteria. setcostallowed (false );
Criteria. setpowerrequirement (criteria. power_low );
String cityname = NULL;
// Criteria with the best effect
String provider = locationmanager. getbestprovider (criteria, true );
If (provider = NULL ){
Return NULL;
}
// Obtain coordinate information
Location = locationmanager. getlastknownlocation (provider );
If (location = NULL ){
Return NULL;
}
 
If (location! = NULL ){
Double latitude = location. getlatitude ();
Double longpolling = location. getlongpolling ();
// Determine the encoding in a more geographical environment
Geocoder GC = new geocoder (context, locale. getdefault ());
Try {
// Obtain address-related information \ longitude and latitude
List <address> addresses = GC. getfromlocation (latitude, longpolling, 1 );
Stringbuilder sb = new stringbuilder ();
If (addresses. Size ()> 0 ){
Address = addresses. Get (0 );
SB. append (address. getlocality (). append ("\ n ");
Cityname = sb. tostring ();
}
} Catch (ioexception e ){
}
}
Return cityname;
}