[英]How to get latitude and longitude in flutter
我可以弄清楚如何將用戶的緯度和經度放在一起,但需要單獨獲取它們以利用 Geolocator 包中的 Geolocator().distanceBetween 函數。 我下面的代碼不斷收到錯誤消息:
未處理的異常:NoSuchMethodError:在 null 上調用了 getter 'latitude'。
接收器:空
嘗試調用:緯度
Future<Position> getLocation() async {
var currentLocation;
try {
currentLocation = await geolocator.getCurrentPosition(
desiredAccuracy: LocationAccuracy.best);
} catch (e) {
currentLocation = null;
}
return currentLocation;
}
void calculateDistance() async {
getLocation().then((position) {
userLocation = position;
});
final double myPositionLat = userLocation.latitude;
final double myPositionLong = userLocation.longitude;
final double TPLat = 51.5148731;
final double TPLong = -0.1923663;
final distanceInMetres = await Geolocator().distanceBetween(myPositionLat, myPositionLong, TPLat, TPLong)/1000;
print(distanceInMetres);
}
嘗試這個 :
void calculateDistance() async {
getLocation().then((position) {
userLocation = position;
final double myPositionLat = userLocation.latitude;
final double myPositionLong = userLocation.longitude;
final double TPLat = 51.5148731;
final double TPLong = -0.1923663;
final distanceInMetres = await Geolocator().distanceBetween(myPositionLat, myPositionLong, TPLat, TPLong)/1000;
print(distanceInMetres);
});
}
或另一種方法是:
void calculateDistance() async {
userLocation = await getLocation();
final double myPositionLat = userLocation.latitude;
final double myPositionLong = userLocation.longitude;
final double TPLat = 51.5148731;
final double TPLong = -0.1923663;
final distanceInMetres = await Geolocator().distanceBetween(myPositionLat, myPositionLong, TPLat, TPLong)/1000;
print(distanceInMetres);
}
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