{Android App}如何显示距当前位置和指定点的距离？
我已经研究了几个小时，我看到的唯一答案指向我
http://developer.android.com/reference/android/location/Location.html
并使用该方法
public static void distanceBetween（double startLatitude，double startLongitude，double endLatitude，double endLongitude，float [] results）
我需要帮助了解这与我的应用程序有什么关系。这就是我如何检索我的位置。
LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager)getSystemService(context);
String provider = LocationManager.GPS_PROVIDER;
Location location = locationManager.getLastKnownLocation(provider);
updateWithNewLocation(location);
}
private void updateWithNewLocation(Location location) {
String latLongString;
TextView myLocationText;
myLocationText = (TextView)findViewById(R.id.myLocationText);
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
latLongString = "Lat:" + lat + "nLong:" + lng;
} else {
latLongString = "No location found";
}
myLocationText.setText("Your Current Position is:n" +
latLongString);
}
没有找到相关结果
已邀请:
2 个回复
焙恍挝厂熄
public double calcdist() { int MILLION = 1000000; int EARTH_RADIUS_KM = 6371; double lat1 = la1 / MILLION;// latitude of location 1 double lon1 = lo1 / MILLION; //longitude of location 1 double lat2 = la2 / MILLION; //latitude of location 2 double lon2 = lo2 / MILLION;//longitude of location 2 double lat1Rad = Math.toRadians(lat1); double lat2Rad = Math.toRadians(lat2); double deltaLonRad = Math.toRadians(lon2 - lon1); double dist = Math.acos(Math.sin(lat1Rad) * Math.sin(lat2Rad) + Math.cos(lat1Rad) * Math.cos(lat2Rad) * Math.cos(deltaLonRad)) * EARTH_RADIUS_KM; return dist; }禽兢玫坞劲
public boolean locChanged = false; public LocationManager locMgr = null; public Location referenceL = null; // Your reference location public Location currentKL = null; // Current known location public Location currentLKL = null; // Current last known location //Initialise the GPS listener locMgr = (LocationManager) appCtx.getSystemService(Context.LOCATION_SERVICE); locMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, fixGpsListener); currentLKL = locMgr.getLastKnownLocation(LocationManager.GPS_PROVIDER); //Define the GPS listener LocationListener fixGpsListener = new LocationListener() { public void onLocationChanged(Location location) { locChanged = true; if (currentKL == null) currentKL = location; else if (isAccurateForUse()) { currentLKL = currentKL; currentKL = location; updateDistance(meterToKilometer(currentKL.distanceTo(referenceL))); } } public void onProviderDisabled(String provider) {} public void onProviderEnabled(String provider) {} public void onStatusChanged(String provider, int status, Bundle extras) {} };