How to use provider beetween several classes in flutter? - flutter

Question

I am creating a register app in flutter, but there is too much information tu use a single screen, so I decided to use tab views in the screens and separate the screens in objects of a drawer.
but I needed to use the information from diferent screens to saved it. so I think about using a Multiprovider. but when I try to use the information in the provider it throws:
Could not find the correct Provider<General> above this Baseformularios Widget
my implementation is like this:
Here is my drawer with the first field General, that is basic information about the client,
as you can see the provider is created here and the body: is supplied by a variable called bodycontent, that will be over written when a try to change the form, but when I try to print the name of the user it throws the error above.
MultiProvider(
providers: [
ChangeNotifierProvider<General>(
create: (context)=>General(),
)
],
child: Scaffold(
appBar: AppBar(
title: Text("Historias clinicas"),
centerTitle: true,
actions: <Widget>[
IconButton(
icon: Icon(Icons.check),
onPressed: (){
print(Provider.of<General>(context).nombre);
Provider.of<General>(context).addCLiente();
},
)
],
),
body: bodycontent,
drawer: Drawer(
child: ListView(
padding: EdgeInsets.zero,
children: <Widget>[
AspectRatio(
aspectRatio: 0.001/0.001,
child: DrawerHeader(
decoration: BoxDecoration(
gradient: LinearGradient(colors: [Colors.white,Colors.blueAccent]
),
),
),
ListTile(
title: Text("General"),
onTap: (){
setState(() {
bodycontent = I_II_III_IV();
});
Navigator.pop(context);
},
),
],
),
),
),
);
and here is the usage on the form general:
Provider.of<General>(context).set(nombre.text,
"Apellido hay que quitar en la funcion",
edad.text,
_currentsexo,
estado_civil.text,
direccion.text,
emergencia.text,
procedencia.text,
telefono.text,
ocupacion.text,
referencia.text,
fecha_inicio.text,
"",userid);
this save well the information, I checked it in the debugger, but the problem is in the other side.
I tried using the multiprovider in the screen before the one with the drawer, but it throwed the same error but with "above generalform". notice that I removed the multiprovider from the screen with the drawer when I tried this.
so should I declare the multiprovider in every screen to use it into it's son? because I supposed that provider where variables that you could use in every screen after the one where it's declare, or am I missunderstanding something?... Every help is very appreciated, thanks before hand.

Answer 1

To get access to the Provider from every where in your app, you should declare it in the main:
void main() {
runApp(MultiProvider(
providers: [
ChangeNotifierProvider<General>(
create: (context) => General(),
),
],
child: MyApp(),
));
}