Flutter setState screen each time a global variable changes-CodePudding

I have a global variable and I want to setState the current screen each time its value changes.

Is that possible?

CodePudding user response：

you should use provider for that link,

You start your root Build method in the app with:

@override
  Widget build(BuildContext context) {
    return MultiProvider(  // Multi means you can have more providers if you need
      providers: [
        ChangeNotifierProvider(builder: (context) => MyStateClass()),
      ],
      child: MaterialApp(....

Now you can place all the data you need to share in the MyStateClass() and place underlying Widgets inside:

 Consumer<MyStateClass>(builder: (context, state, child) {

      // your code here - return(SomeOtherWidget());
    })

or inside your Build methods:

  @override
  Widget build(BuildContext context) {
   MyStateClass state = Provider.of<MyStateClass>(context);
   // ... TODO  ... return (Widget)