我正在嘗試製作一個應用程序,它將用戶的當前位置的緯度和經度作爲參考。並且瞬間計數,以km爲單位的用戶旅行距離。Android:如何使用GPS測量距離
「currentLat」和「currentLon」是當前用戶的緯度和經度。但我不知道放入「endLat」和「ednLon」的經度和緯度。
對不起,我的英語不好。
在此先感謝。
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我做它的應用程序,但現在只有一個小問題。 當我第一次開始程序,我得到價值5536,當我重新啓動程序,我得到正常值0.0
再次抱歉我的英語不好。 :)
和球員,感謝幫助我,你是最好的:)
public class Gps extends Activity {
TextView display;
double currentLon=0 ;
double currentLat=0 ;
double lastLon = 0;
double lastLat = 0;
double distance;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
display = (TextView) findViewById(R.id.info);
LocationManager lm =(LocationManager) getSystemService(LOCATION_SERVICE);
lm.requestLocationUpdates(lm.GPS_PROVIDER, 0,0, Loclist);
Location loc = lm.getLastKnownLocation(lm.GPS_PROVIDER);
if(loc==null){
display.setText("No GPS location found");
}
else{
//set Current latitude and longitude
currentLon=loc.getLongitude();
currentLat=loc.getLatitude();
}
//Set the last latitude and longitude
lastLat=currentLat;
lastLon=currentLon ;
}
LocationListener Loclist = new LocationListener(){
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
//start location manager
LocationManager lm =(LocationManager) getSystemService(LOCATION_SERVICE);
//Get last location
Location loc = lm.getLastKnownLocation(lm.GPS_PROVIDER);
//Request new location
lm.requestLocationUpdates(lm.GPS_PROVIDER, 0,0, Loclist);
//Get new location
Location loc2 = lm.getLastKnownLocation(lm.GPS_PROVIDER);
//get the current lat and long
currentLat = loc.getLatitude();
currentLon = loc.getLongitude();
Location locationA = new Location("point A");
locationA.setLatitude(lastLat);
locationA.setLongitude(lastLon);
Location locationB = new Location("point B");
locationB.setLatitude(currentLat);
locationB.setLongitude(currentLon);
double distanceMeters = locationA.distanceTo(locationB);
double distanceKm = distanceMeters/1000f;
display.setText(String.format("%.2f Km",distanceKm));
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
};
}
這裏有什麼錯誤? – 2013-04-05 07:40:26
順便說一句,你的方法發送相同的位置,所以距離總是會返回0米。 – Carnal 2013-04-05 07:44:53