requestPermissionIfNeed method

Implementation

requestPermissionIfNeed() async {
  if (await checkLocationService() &&
      await Permission.location.request().isDenied) {
    Map<Permission, PermissionStatus> statuses = await [
      Permission.location,
    ].request();
    if (statuses[Permission.location] != PermissionStatus.granted) {
      BZLoading.toast("未获取到定位权限");
      return;
    }
  }
}