如何在 function 外部的有状态小部件内部调用 flutter function？

Question

I want to call the _setSilentMode() function inside fireAlarm(). _setSilentMode() is inside statefull widget but fireAlarm() is outside stateful widget. whenever i put _setSilentMode() function inside fireAlarm() it gives error.

class _MyAppState extends State<MyApp> {
 
  Future<void> _setSilentMode() async {
    RingerModeStatus status;

    try {
      status = await SoundMode.setSoundMode(RingerModeStatus.silent);

      setState(() {
        _soundMode = status;
      });
    } on PlatformException {
      print('Do Not Disturb access permissions required!');
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Welcome to Flutter',
      home: Scaffold(
          appBar: AppBar(
            title: const Text('Welcome to Flutter'),
          ),
          body: SingleChildScrollView(
              child: Column(
            children: [
              Switch(
                onChanged: (value) {
                  setState(() {
                    isOn = value;
                  });

                  AndroidAlarmManager.oneShot(
                    Duration(seconds: 15),
                    alarmId,
                    fireAlarm,
                  );
                  print('Alarm set  at ${DateTime.now()}');
                },
                value: isOn,
                activeColor: Colors.blue,
                activeTrackColor: Colors.yellow,
                inactiveThumbColor: Colors.redAccent,
                inactiveTrackColor: Colors.orange,
              )
            ],
          ))),
    );
  }
}

 void fireAlarm() {
    print('Alarm Fired at ${DateTime.now()}');
      // i want to call _setSilentMode() here but it gives me error 
     _setSilentMode();
 }

please help me that how to solve this problem and add _setSilentMode() inside fireAlarm() to work.

Answer 1

• You can use GlobalKey to access the State and call method of state to update UI. You need to make state and method public.
• Alternatively, I recommend using state management libraries such as RiverPod or Provider.

Answer 2

The method is outside the State class. For such you simply add widget before calling it

widget.fireAlarm