仅当设备连接到usb充电器时，flutte应用才会在后台运行

Question

我尝试验证简单的任务=>持续振动时，设备是水平的(用户坐下来)，目前它的工作时，屏幕关闭，只有当设备连接到笔记本电脑或U盘充电器。我尝试了workmanager和android_alarm_manager，但我也遇到了同样的问题。我做错了什么吗？或者这是不可能的？

这是一个简单的复制代码，当设备连接和未连接时，可以在后台测试计时器和振动。

import 'package:android_alarm_manager/android_alarm_manager.dart';
import 'package:flutter/material.dart';
import 'package:vibration/vibration.dart';
import 'dart:async';
main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await AndroidAlarmManager.initialize();
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  Timer _timer;
  test_vibration() {
    _timer= Timer.periodic(const Duration(seconds: 1), (timer) {
      Vibration.vibrate();
    });

  }

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
      AndroidAlarmManager.periodic(Duration(seconds: 1), 0, test_vibration());
  }



  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center()
      ),
    );
  }
}

下面是更完整的加速度计示例

import 'package:sensors/sensors.dart';
import 'package:android_alarm_manager/android_alarm_manager.dart';
import 'package:flutter/material.dart';
import 'package:vibration/vibration.dart';
import 'dart:async';
main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await AndroidAlarmManager.initialize();
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
 
List<double> _accelerometerValues;

List<StreamSubscription<dynamic>> _streamSubscriptions =
<StreamSubscription<dynamic>>[];


test_vibration() {

  _streamSubscriptions.add(accelerometerEvents.listen((AccelerometerEvent event) {    // Stream accelerometre
      _accelerometerValues = <double>[event.y];  read accelerometer y
    

      if (event.y>6.0||event.y<-6.0){ //device vertical

      }else{ // device horizontal

        Vibration.vibrate();

      }
  }));
}



  @override
  void initState() {
    // TODO: implement initState
    super.initState();

    _streamSubscriptions.add(accelerometerEvents.listen((AccelerometerEvent event) {
      setState(() {
        _accelerometerValues = <double>[event.y];
      });

      AndroidAlarmManager.periodic(Duration(seconds: 1), 0, test_vibration());

    }));
  }



  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center()
      ),
    );
  }
}

Answer 1

我找到的解决方案：

<uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />