Three ways to locate Android

Recently in the look at Android on the way of positioning, looked up a lot of information, also did the relevant experiments, on the phone to do the test, the following summary:

There are three kinds of positioning methods, one is GPS, one is through the network, one is based on the base station, but either way, you need to turn on the network or GPS

Add Permissions First

    <uses-permission android:name= "Android.permission.ACCESS_COARSE_LOCATION"/>     <uses-permission Android:name= "Android.permission.ACCESS_FINE_LOCATION"/>

In the coarse_location is used for base station positioning, without this permission, in the acquisition of Getcelllocation error.

The first way, through Jason, is through the base station, citing the article address: http://www.cnblogs.com/dartagnan/archive/2011/3/9.html, the download is just the code that implements the positioning

/** * For more information on the implementation of Google targeting .<br/> * geolocation, see:<br/> * <a * href= "http://code.google.com/apis/ge Ars/geolocation_network_protocol.html "mce_href=" Http://code.google.com/apis/gears/geolocation_network_  Protocol.html "> * http://code.google.com/apis/gears/geolocation_network_protocol.html</a> * * * public class        Locationact extends Activity {private TextView txtinfo;            public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);            Setcontentview (R.layout.main);            Button btn = (button) Findviewbyid (R.id.btnstart);            Txtinfo = (TextView) Findviewbyid (r.id.txtinfo); Btn.setonclicklistener (New Button.onclicklistener () {public void OnClick (view view) {G                Etlocation ();        }            }); } private void GetLocation () {Telephonymanager TM = (Telephonymanager) getsystemservice (Context.telepho Ny_service);            Gsmcelllocation Gsmcell = (gsmcelllocation) tm.getcelllocation ();            int cid = Gsmcell.getcid ();            int lac = Gsmcell.getlac ();            String netoperator = Tm.getnetworkoperator ();            int MCC = integer.valueof (netoperator.substring (0, 3));            int MNC = integer.valueof (netoperator.substring (3, 5));            Jsonobject holder = new Jsonobject ();            Jsonarray array = new Jsonarray ();            Jsonobject data = new Jsonobject ();                try {holder.put ("version", "1.1.0");                Holder.put ("Host", "maps.google.com");                Holder.put ("Address_language", "ZH_CN");                Holder.put ("Request_address", true);                Holder.put ("Radio_type", "GSM");                Holder.put ("Carrier", "HTC");                Data.put ("cell_id", CID);                Data.put ("Location_area_code", LAC);                Data.put ("Mobile_countyr_code", MCC); Data.put ("Mobile_network_code", MNC);                Array.put (data);            Holder.put ("Cell_towers", array);            } catch (Jsonexception e) {e.printstacktrace ();            } defaulthttpclient client = new Defaulthttpclient ();            HttpPost HttpPost = new HttpPost ("Http://www.google.com/loc/json");            Stringentity stringentity = null;            try {stringentity = new stringentity (holder.tostring ());            } catch (Unsupportedencodingexception e) {e.printstacktrace ();            } httppost.setentity (stringentity);            HttpResponse HttpResponse = null;            try {HttpResponse = Client.execute (HttpPost);            } catch (Clientprotocolexception e) {e.printstacktrace ();            } catch (IOException e) {e.printstacktrace ();            } httpentity httpentity = Httpresponse.getentity ();            InputStream is = null;     try {           is = Httpentity.getcontent ();            } catch (IllegalStateException e) {e.printstacktrace ();            } catch (IOException e) {//TODO auto-generated catch block E.printstacktrace ();            } InputStreamReader ISR = new InputStreamReader (IS);            BufferedReader reader = new BufferedReader (ISR);            StringBuffer StringBuffer = new StringBuffer ();                try {String result = "";                while (result = Reader.readline ()) = null) {stringbuffer.append (result);            }} catch (IOException e) {e.printstacktrace ();        } txtinfo.settext (Stringbuffer.tostring ()); }   }

The second is to use a strict GPs to locate, citing the article address: http://www.cnblogs.com/wisekingokok/archive/2011/09/06/2168479.html, here only reference code

public class Mainactivity extends Activity {private Locationmanager locationmanager;      Private Gpsstatus Gpsstatus;         @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);                  Setcontentview (R.layout.main);                  Gets the Locationmanager object Locationmanager = (Locationmanager) getsystemservice (Location_service); Based on the criteria object you set, get the provider object that most conforms to this standard String Currentprovider = Locationmanager.getprovider (Locationmanager.gps_pro                  Vider). GetName ();         Gets the last position information based on the current provider object location Currentlocation = locationmanager.getlastknownlocation (Currentprovider); If the location information is null, the request updates the location information if (currentlocation = = null) {locationmanager.requestlocationupdates (Curren         Tprovider, 0, 0, Locationlistener);                  }//Add GPS Status Listener Locationmanager.addgpsstatuslistener (Gpslistener);   Until the last position information is obtained, the default latitude and longitude is displayed if the last location information is not obtained      Gets the location information once every 10 seconds while (true) {currentlocation = Locationmanager.getlastknownlocation (currentprovi             der);                 if (currentlocation! = null) {LOG.D ("location", "Latitude:" + currentlocation.getlatitude ());                 LOG.D ("Location", "Location:" + currentlocation.getlongitude ());             Break                 }else{log.d ("Location", "Latitude:" + 0);             LOG.D ("Location", "Location:" + 0);             } try {Thread.Sleep (10000);             } catch (Interruptedexception e) {log.e ("location", E.getmessage ());          }}} private Gpsstatus.listener Gpslistener = new Gpsstatus.listener () {//gps state changed when the trigger @Override public void ongpsstatuschanged (int event) {//Gets the current state Gpsstatus=locati              Onmanager.getgpsstatus (NULL);          Switch (event) {//events on first position        Case GpsStatus.GPS_EVENT_FIRST_FIX:break;                  Start locating the event case GpsStatus.GPS_EVENT_STARTED:break; Send GPS satellite Status event case GpsStatus.GPS_EVENT_SATELLITE_STATUS:Toast.makeText (mainactivity                      . This, "Gps_event_satellite_status", Toast.length_short). Show ();                         iterable<gpssatellite> allsatellites = Gpsstatus.getsatellites ();                       Iterator<gpssatellite> It=allsatellites.iterator ();                      int count = 0;                      while (It.hasnext ()) {count++;                      } toast.maketext (Mainactivity.this, "Satellite count:" + count, Toast.length_short). Show ();                  Break   Stop locating event case GPSSTATUS.GPS_EVENT_STOPPED:LOG.D ("Location", "gps_event_stopped");                   Break                  }          }      };           Create location listener private Locationlistener Locationlistener = new Locationlistener () {//position changed when called @Override          public void onlocationchanged (location location) {LOG.D ("location", "onlocationchanged");              Called @Override public void onproviderdisabled (String provider) when//provider is invalidated {          LOG.D ("Location", "onproviderdisabled"); Called when//provider is enabled @Override public void onproviderenabled (String provider) {Log          . D ("Location", "onproviderenabled");  }//@Override public void onstatuschanged (String provider, int status, Bundle extras) is called when the state changes          {LOG.D ("location", "onstatuschanged");  }      }; }

The Third kind is mainly through the network way to locate, the reference article address: http://www.cnblogs.com/wisekingokok/archive/2011/09/05/2167755.html, here only writes the code

Package com.test;  Import java.io.IOException;    Import java.util.List;  Import android.app.Activity;  Import android.location.Address;  Import Android.location.Criteria;  Import Android.location.Geocoder;  Import android.location.Location;  Import Android.location.LocationListener;  Import Android.location.LocationManager;  Import Android.os.Bundle;  Import Android.util.Log;    Import Android.widget.Toast;         public class Mainactivity extends Activity {@Override public void onCreate (Bundle savedinstancestate) {         Super.oncreate (savedinstancestate);                  Setcontentview (R.layout.main);         Gets the Locationmanager object Locationmanager Locationmanager = (locationmanager) getsystemservice (LOCATION_SERVICE);         Create a criteria criteria = new criteria ();         Set the rough Accuracy criteria.setaccuracy (criteria.accuracy_coarse);         Sets whether to return elevation information criteria.setaltituderequired (FALSE); Set whether you want to return the position information criteria.Setbearingrequired (FALSE);         Sets whether to allow paid service criteria.setcostallowed (true);         Set the power consumption level criteria.setpowerrequirement (Criteria.power_high);           Sets whether to return speed information criteria.setspeedrequired (false);         Gets the provider object that most conforms to this criterion, based on the criteria object Set, String Currentprovider = Locationmanager.getbestprovider (criteria, true);         LOG.D ("Location", "Currentprovider:" + currentprovider);         Gets the last position information based on the current provider object location Currentlocation = locationmanager.getlastknownlocation (Currentprovider); If the location information is null, the request updates the location information if (currentlocation = = null) {locationmanager.requestlocationupdates (Curren         Tprovider, 0, 0, Locationlistener);  }//until the last location information is obtained, if the last location information is not obtained, the default latitude/longitude is displayed//Gets the location information once every 10 seconds while (true) {Currentlocation             = Locationmanager.getlastknownlocation (Currentprovider); if (currentlocation! = null) {LOG.D ("location", "Latitude:" + CurrentloCation.getlatitude ());                 LOG.D ("Location", "Location:" + currentlocation.getlongitude ());             Break                 }else{log.d ("Location", "Latitude:" + 0);             LOG.D ("Location", "Location:" + 0);             } try {Thread.Sleep (10000);             } catch (Interruptedexception e) {log.e ("location", E.getmessage ());         }}//resolves the address and displays Geocoder Geocoder = new Geocoder (this);             try {int latitude = (int) currentlocation.getlatitude ();             int longitude = (int) currentlocation.getlongitude ();             list<address> list = Geocoder.getfromlocation (latitude, longitude, 2);                  for (int i=0; i<list.size (); i++) {Address address = list.get (i); Toast.maketext (Mainactivity.this, Address.getcountryname () + address.getadminarea () + address.getfeaturename (), Toast.length_long). ShoW (); }} catch (IOException e) {toast.maketext (Mainactivity.this,e.getmessage (), Toast.length_long). Show ()         ; }}//create location listener private Locationlistener Locationlistener = new Locationlistener () {/ /location is changed when the call @Override public void onlocationchanged (position site) {log.d ("place", "              Onlocationchanged ");                   LOG.D ("Location", "onlocationchanged Latitude" + location.getlatitude ());          LOG.D ("Location", "onlocationchanged location" + location.getlongitude ()); }//provider is called @Override public void onproviderdisabled (String provider) {Lo          G.D ("Location", "onproviderdisabled"); Called when//provider is enabled @Override public void onproviderenabled (String provider) {Log          . D ("Location", "onproviderenabled"); }//@Override public V is called when the state changesOID Onstatuschanged (String provider, int status, Bundle extras) {log.d ("location", "onstatuschanged");  }      }; }