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我对 android_alarm_manager_plus: ^2.0.3 library on flutter 有问题。我尝试在文档中使用它，当我使用周期性方法时，它曾经工作过一次，代码如下：

import 'package:android_alarm_manager_plus/android_alarm_manager_plus.dart';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';

main() async {
  // Be sure to add this line if initialize() call happens before runApp()
  WidgetsFlutterBinding.ensureInitialized();

  await AndroidAlarmManager.initialize();
  runApp(MaterialApp(home: MyApp()));
  const int helloAlarmID = 0;
  await AndroidAlarmManager.periodic(const Duration(seconds: 5), 1, printHello,
      wakeup: true, exact: true);
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold();
  }
}

void printHello() {
  Fluttertoast.showToast(
      msg: "This is Center Short Toast",
      toastLength: Toast.LENGTH_SHORT,
      gravity: ToastGravity.CENTER,
      timeInSecForIosWeb: 1,
      backgroundColor: Colors.red,
      textColor: Colors.white,
      fontSize: 16.0);
}

我将这些权限添加到清单中：

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<!-- For apps with targetSDK=31 (Android 12) -->
<uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM"/>

这些服务：

<service
    android:name="dev.fluttercommunity.plus.androidalarmmanager.AlarmService"
    android:permission="android.permission.BIND_JOB_SERVICE"
    android:exported="false"/>
<receiver
    android:name="dev.fluttercommunity.plus.androidalarmmanager.AlarmBroadcastReceiver"
    android:exported="false"/>
<receiver
    android:name="dev.fluttercommunity.plus.androidalarmmanager.RebootBroadcastReceiver"
    android:enabled="false"
    android:exported="false">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
</receiver>

toast 消息在 5 m 后出现一次，然后就不会出现了！:(

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