checkPermission method
Returns a Future indicating if the user allows the App to access the device's location.
Note: on the web platform not all browsers implement the Permission API
if this is the case the LocationPermission.unableToDetermine
is returned
as the plugin cannot determine the if permissions are granted or denied.
Implementation
Future<LocationPermission> checkPermission() {
throw UnimplementedError(
'checkPermission() has not been implemented.',
);
}