使用GPS的位置在OREO上返回null

Question

我在Android OREO 8.1（Nexus 5X已升级）上测试了我的应用，并且GPS的位置返回null：

LocationManager locationManager = (LocationManager) MyApplication.getInstance().
                getSystemService(Context.LOCATION_SERVICE);

if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
     // With GPS
     location = locationManager.getLastKnownLocation(locationManager, LocationManager.GPS_PROVIDER);
}

location 对象始终为空。