我正在尝试创建一个关于定期从 Google Fit API 获取步骤数据并将该数据发送到自定义 API 的应用程序。到目前为止，一切都很好，并且在应用程序打开时工作正常。然后我想让这些事情发生，即使我杀死了应用程序。
为此，我使用了Flutter Foreground Task插件，它运行良好。但是当我尝试在前台调用获取健康数据功能时，插件说“未授予授权。”。我真的不知道为什么会发生这种情况以及我必须做什么。我是 Flutter 的新手，这是我第一次做这样的项目。
注意：我做了一切设置Health Plugin。我得到了 SHA1 密钥并将其添加到 Google API 控制台等。当我在应用程序中使用它时它工作正常。问题是在前台服务方法上使用它。
Foregorund 服务方法（我称之为获取健康数据方法）
class FirstTaskHandler implements TaskHandler {
@override
Future<void> onStart(DateTime timestamp, SendPort? sendPort) async {
// You can use the getData function to get the data you saved.
final customData =
await FlutterForegroundTask.getData<String>(key: 'Steps');
print('Steps: $customData');
}
@override
Future<void> onEvent(DateTime timestamp, SendPort? sendPort) async {
// Send data to the main isolate.
GetHealthData().fetchHealthDataMethod(); //This is where i call health plugin to fetch steps data on foreground.
sendPort?.send(timestamp);
}
@override
Future<void> onDestroy(DateTime timestamp) async {
// You can use the clearAllData function to clear all the stored data.
await FlutterForegroundTask.clearAllData();
}
}
healthData.dart 类（我实现获取健康数据功能的地方）
class GetHealthData extends StatefulWidget {
const GetHealthData({Key? key}) : super(key: key);
fetchHealthDataMethod() => createState().fetchHealthData();
@override
_GetHealthDataState createState() => _GetHealthDataState();
}
class _GetHealthDataState extends State<GetHealthData> {
List<HealthDataPoint> _healthDataList = [];
var nickname;
@override
void initState() {
super.initState();
}
Future fetchHealthData() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
var datasource = prefs.getInt('datasource');
if (prefs.getString("token") != null && datasource == 1) {
// get everything from midnight until now
DateTime current = DateTime.now();
DateTime dateFrom;
DateTime dateTo;
dateFrom = current.subtract(Duration(
hours: current.hour,
minutes: current.minute,
seconds: current.second,
milliseconds: current.millisecond,
));
dateTo = DateTime.now();
HealthFactory health = HealthFactory();
// define the types to get
List<HealthDataType> types = [
HealthDataType.STEPS,
];
// you MUST request access to the data types before reading them
bool accessWasGranted = await health.requestAuthorization(types);
int steps = 0;
if (accessWasGranted) {
try {
// fetch new data
List<HealthDataPoint> healthData =
await health.getHealthDataFromTypes(dateFrom, dateTo, types);
// save all the new data points
_healthDataList.addAll(healthData);
} catch (e) {
print("Caught exception in getHealthDataFromTypes: $e");
}
// filter out duplicates
_healthDataList = HealthFactory.removeDuplicates(_healthDataList);
SharedPreferences prefs = await SharedPreferences.getInstance();
// print the results
_healthDataList.forEach((x) {
print("Data point: $x");
steps += x.value.round();
Users.steps = steps;
TempData.tempSteps = steps;
prefs.setInt(('sharedSteps'), steps);
});
await FlutterForegroundTask.saveData(key: 'Steps', value: steps);
print("Steps: $steps");
} else {
print("Authorization not granted");
}
}
}
和错误
和调试控制台；
Connecting to VM Service at ws://127.0.0.1:50101/GkZr18KQmIA=/ws
[log] 2021-11-09 12:24:16.768249 FlutterForegroundTask started
I/flutter (18179): Data point: HealthDataPoint - value: 19, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 01:08:09.585, dateTo: 2021-11-09 01:09:09.585, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 10, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 01:09:09.585, dateTo: 2021-11-09 01:09:46.051, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 12, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 01:09:46.051, dateTo: 2021-11-09 01:09:53.487, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 9, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 01:15:43.795, dateTo: 2021-11-09 01:16:43.795, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 17, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 06:31:24.190, dateTo: 2021-11-09 06:32:24.190, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 24, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 06:34:48.088, dateTo: 2021-11-09 06:35:48.088, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 10, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 08:25:12.995, dateTo: 2021-11-09 08:26:12.995, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 17, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 08:53:43.038, dateTo: 2021-11-09 08:54:43.038, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 3, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 08:54:43.038, dateTo: 2021-11-09 08:54:45.471, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 15, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 08:56:23.259, dateTo: 2021-11-09 08:57:23.259, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 8, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 09:01:12.205, dateTo: 2021-11-09 09:02:12.205, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 6, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 10:02:14.110, dateTo: 2021-11-09 10:03:14.110, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 3, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 10:03:14.110, dateTo: 2021-11-09 10:03:16.431, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Data point: HealthDataPoint - value: 36, unit: HealthDataUnit.COUNT, dateFrom: 2021-11-09 11:01:47.001, dateTo: 2021-11-09 11:02:59.001, dataType: HealthDataType.STEPS,platform: PlatformType.ANDROIDsourceId: raw:com.google.step_count.cumulative:samsung:SM-A705FN:c74e7372:step_counter Non-wakeup,sourceName: SM-A705FN,
I/flutter (18179): Steps: 189
74
I/flutter (18179): Authorization not granted
如您所见，当从 initState 调用 fetching 函数时，它可以正常工作。它可以显示步骤数据并可以打印到屏幕上，但是当我从前台调用相同的函数时，它会显示“未授予授权”。
如果您需要更多信息，请向我询问。感谢您的任何建议和帮助。