Flutter settings switch is not turned on when I click on back button

[shahbaz shiekh]

Hi , 

I have a settings menu which I have used different methods for the Onchanged 

and I want my application to keep the switch checked once I click on it but when I click the back button and back into the settings menu it is back to false 

please help I have tried multiple avenues still can't get this to work: 

 through shared preference: 

activateIcyMistHighlighter(bool value) async {

setState(() {

// checkValue = true;

_icymistSwitch = true;

_icymistColor = true;

_icymistEnable = true;

_heartColor = false;

_heartSwitch = false;

// _heartEnable = !_heartEnable;

_heartEnable = true;

_deepoceanColor = false;

_deepoceanSwitch = false;

_deepoceanEnable = true;

// _deepoceanEnable = !_deepoceanEnable;

_flowerColor = false;

_flowerSwitch = false;

_flowerEnable = true;

// _flowerEnable = !_flowerEnable;

_gardenColor = false;

_gardenSwitch = false;

_gardenEnable = true;

// _gardenEnable = !_gardenEnable;

_paradiseColor = false;

_paradiseSwitch = false;

_paradiseEnable = true;

// _paradiseEnable = !_paradiseEnable;

_midnightparadiseColor = false;

_midnightparadiseSwitch = false;

_midnightparadisEnable = true;

// _midnightparadisEnable = !_midnightparadisEnable;

_midnightColor = false;

_midnightEnable = true;

// _midnightEnable = !_midnightEnable;

_midnightSwitch = false;

});

SharedPreferences prefs = await SharedPreferences.getInstance();

bool saved = prefs.getBool('switch') ?? false;

return saved;

}

activateHeartHighlighter(bool value) {

setState(() {

_heartColor = true;

_heartSwitch = true;

_heartEnable = true;

_icymistColor = false;

_icymistSwitch = false;

_icymistEnable = true;

_deepoceanColor = false;

_deepoceanSwitch = false;

_deepoceanEnable = true;

_flowerColor = false;

_flowerSwitch = false;

_flowerEnable = true;

_gardenColor = false;

_gardenSwitch = false;

_gardenEnable = true;

_paradiseColor = false;

_paradiseSwitch = false;

_paradiseEnable = true;

_midnightparadiseColor = false;

_midnightparadiseSwitch = false;

_midnightparadisEnable = true;

_midnightColor = false;

_midnightEnable = true;

_midnightSwitch = false;

// if (activateIcyMistHighlighter(value)) {

// setState(() {

// // _heartColor = false;

// });

}

// }

);

}

// }

Switch(

// contentPadding: const EdgeInsets.all(0),

// value: _icymistSwitch,

value: _icymistSwitch,

activeColor: Colors.cyan,

// title: Text("final one"),

// onChanged: (bool value) async =>

// activateIcyMistHighlighter(value)),

onChanged: (bool value) async =>

await activateIcyMistHighlighter(value)),

// back button

appBar: AppBar(

backgroundColor: Colors.cyan,

title: Text("Settings Menu",

style: TextStyle(color: styling.appBarTextcolor)),

leading: FlatButton(

textColor: Colors.white,

child: Icon(styling.appBarBackArrowIcon),

// onPressed: () async {

// bool valueishere = await _getvalue();

// Navigator.of(context).push(MaterialPageRoute(

// builder: (context) =>

// valueishere ? NavDrawer() : AliflaammeemPg2(),

onPressed: () => Navigator.pop(context, false),

// MaterialPageRoute(builder: (context) => NavDrawer()),

// setState

// }

// ),

// onPressed: () async {

// bool valueishere = await savedata();

// Navigator.of(context).push(MaterialPageRoute(

// builder: (context) =>

// valueishere ? NavDrawer() : AliflaammeemPg2(),

// }

// ));

Please help.... 

[Suzuki Tomohiro]

How does _icymistSwitch get initialized using SharedPreferences?

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[shahbaz....@gmail.com]

Well I have 8 switches

And IcymistSwitch is false in the beginning but that of a user clicks on one of the switches it envokes a method 

Icymisthighlighter which has icymisswitch and all the other switches to show once that method set state is to on the rest will be off and vice versa .... 

Sent from my iPhone

On Jan 18, 2021, at 7:08 PM, Suzuki Tomohiro <suz...@gmail.com> wrote:



To view this discussion on the web visit https://groups.google.com/d/msgid/flutter-dev/CAHWORbqb_zZKHT0akPEHqPhOi2B1F_ARUTWhn%2BhzMavEWQa0mA%40mail.gmail.com.

[Suzuki Tomohiro]

Asking again; How does _icymistSwitch get initialized using SharedPreferences?

[shahbaz....@gmail.com]

I don’t get it ... 

Icymistswitch is not getting initialized by shared preference it’s icymisthighlighter the one that has shared preference adding within its method ... is that where I am wrong?

Sent from my iPhone

On Jan 18, 2021, at 8:16 PM, Suzuki Tomohiro <suz...@gmail.com> wrote:



To view this discussion on the web visit https://groups.google.com/d/msgid/flutter-dev/CAHWORbrbveEgRXf96512u%3DkcmTnnRiRwx%3D%2BstkLOJ1BYthWGZQ%40mail.gmail.com.

[Suzuki Tomohiro]

The _icymistSwitch determines the Switch’s on/off state in your code:

Switch(

...

value: _icymistSwitch,

You want to remember its value by SharedPreferences.

[shahbaz....@gmail.com]

I tried doing that 

Made a method and called it in the value space

But I am getting an error 

addBoolToSF() async {

SharedPreferences prefs = await SharedPreferences.getInstance();

	prefs.setBool('boolValue', true);
	} The error was saying this is not A bool value

Sent from my iPhone

On Jan 18, 2021, at 10:21 PM, Suzuki Tomohiro <suz...@gmail.com> wrote:



To view this discussion on the web visit https://groups.google.com/d/msgid/flutter-dev/CAHWORbqVvEdEp93B9ZVDbQPd8uWm8H02i5gfH8%3DyFh1d0ktSBQ%40mail.gmail.com.

[Lucas Correa]

I think that problem is not in this line... can you show complete msg error and/or all this piece of code?

To view this discussion on the web visit https://groups.google.com/d/msgid/flutter-dev/9A1F6DB7-5EF9-49DD-AE57-2C85A3385978%40gmail.com.

--

Lucas Correa

[Suzuki Tomohiro]

Hi Shahbaz,

Read the error message and the stack trace carefully. The “this is not a bool value” error didn’t occur at the line.

I guess the error occurred at an if-statement that tried to read the value through shared preference.

If you think your analysis is correct, copy-paste the entire error message including the stack trace.

[shahbaz shiekh]

Hi Suzuki, 

Please see below this is the error I am getting when I add the shared preference method withn the value space 

Pleas help I have been stuck on this for a while now, I even gave away 50 rep points in stack overflow but no luck …..

The activateIcyMistHighlighter is the method that controls the unchanged so I thought I need to save that preference, 

But when I save the preference for just the switch I get an error. 

The settings page looks like this: 

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[Suzuki Tomohiro]

Where is the stack trace of the error?