firebase - 即使应用程序在 flutter 中被杀死，如何将用户位置发送到 Firestore？

Question

我正在尝试将用户的位置发送到 Firestore，即使该应用已被终止。当应用程序处于前台或后台时，我能够成功地将数据发送到 Firestore，但当应用程序被终止时，我无法发送数据。任何人都可以解释可能是什么问题吗？

我正在使用

background_locator: ^1.6.4

flutter

Flutter 2.2.3 • channel stable • https://github.com/flutter/flutter.git
Framework • revision f4abaa0735 (2 weeks ago) • 2021-07-01 12:46:11 -0700
Engine • revision 241c87ad80
Tools • Dart 2.13.4

Dart

Dart SDK version: 2.13.4 (stable) (Wed Jun 23 13:08:41 2021 +0200) on "linux_x64"

接收到数据后我尝试执行的这段代码

receiverPort.listen(
      (dynamic data) async {
        if (data != null) {
          WidgetsFlutterBinding.ensureInitialized();
          await Firebase.initializeApp();
          final LocationDto position = data as LocationDto;
          print('data: $position');

          final Member member = await FirebaseService().getCurrentUserProfile();
          member.currentPosition = '${position.latitude},${position.longitude}';
          await FirebaseService()
              .updateData(
                  FirebaseService.memberRef,
                  FirebaseService.memberChildId,
                  FirebaseService.getCurrentUserId(),
                  member.toJson())
              .then((value) {});
        } else {
          print('data is null');
        }
      },
    );

如果我需要分享任何其他内容，请告诉我。谢谢

Answer 1

我发现了问题。我需要在回调中而不是在 ReceivePort 中添加 Firestore 代码。这是工作代码:

Future<void> _startLocator() async {
    final Map<String, dynamic> data = {'countInit': 1};
    return BackgroundLocator.registerLocationUpdate(
        LocationCallbackHandler.callback, // <-- You need to add your callback code here
        initCallback: LocationCallbackHandler.initCallback,
        initDataCallback: data,
        disposeCallback: LocationCallbackHandler.disposeCallback,
        iosSettings: const IOSSettings(
            accuracy: location_settings.LocationAccuracy.BALANCED,),
        androidSettings: AndroidSettings(
            accuracy: location_settings.LocationAccuracy.BALANCED,
            interval: 5,
            androidNotificationSettings: AndroidNotificationSettings(
                notificationChannelName: 'Location tracking',
                notificationTitle:
                    location.isNotEmpty ? location : 'Start Location Tracking',
                notificationMsg: 'Track location in background',
                notificationBigMsg:
                    'Background location is on to keep the app up-to-date with your location. This is required for main features to work properly when the app is not running.',
                notificationIconColor: Colors.grey,
                notificationTapCallback:
                    LocationCallbackHandler.notificationCallback)));
  }

Future<void> callback(LocationDto locationDto) async {
   // Your call back code goes here
}