How to get GPS Distance travelled in Android with this code? -

i totally new android , stuck problem.

basically want when move, app gps info , display on phone including distance travelled in meter. don't know how in android.

this code.

public class mainactivity extends appcompatactivity {      textview tv;     textview tv2;     togglebutton tb;     button currentgps;        @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          location location11 = null;         double longitude1 = 0;//location11.getlongitude();         double latitude1 = 0;//location11.getlatitude();          tv = (textview) findviewbyid(r.id.textview2);         tv.settext("ready");          tb = (togglebutton)findviewbyid(r.id.toggle1);             final locationmanager lm = (locationmanager) getsystemservice(context.location_service);          tb.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 try{                     if(tb.ischecked()){                         tv.settext("connecting..");                          lm.requestlocationupdates(locationmanager.gps_provider,                                  100,                                  1,                                  mlocationlistener);                         lm.requestlocationupdates(locationmanager.network_provider,                                  100,                                  1,                                  mlocationlistener);                      }else{                         tv.settext("information not connecting");                         lm.removeupdates(mlocationlistener);                       }                 }catch(securityexception ex){                 }             }         });     }    private final locationlistener mlocationlistener = new locationlistener() {           public void onlocationchanged(location location1) {              log.d("test", "onlocationchanged, location:" + location1);             double longitude = location1.getlongitude();              double latitude = location1.getlatitude();                double altitude = location1.getaltitude();                float accuracy = location1.getaccuracy();                 string provider = location1.getprovider();                  final double latitudea = location1.getlatitude();             final double longitudea = location1.getlongitude();              double distance;               location locationa = new location("point a");             locationa.setlatitude(latitudea);             locationa.setlongitude(longitudea);              location locationb = new location("point b");             locationb.setlatitude(latitude);             locationb.setlongitude(longitude);               distance = locationa.distanceto(locationb);                float currentspeed = (location1.getspeed()*3600/1000);             string convertedspeed = string.format("%.2f",currentspeed);                 tv.settext("provider : " + provider + "\n\nlatitude : " + longitude + "\n\nlangitude : " + latitude                     + "\n\naltitude : " + altitude + "\n\naccuracy : "  + accuracy +"/\n\nmoving distance :  " + distance + "/m"                     + "\n\ncurrent speed : " + convertedspeed + "km/h");         }         public void onproviderdisabled(string provider) {              log.d("test", "onproviderdisabled, provider:" + provider);         }          public void onproviderenabled(string provider) {              log.d("test", "onproviderenabled, provider:" + provider);         }          public void onstatuschanged(string provider, int status, bundle extras) {              log.d("test", "onstatuschanged, provider:" + provider + ", status:" + status + " ,bundle:" + extras);         }     }; }