barra de bocadillos superior en ejemplo de código de flutter

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Ejemplo 1: barra de aperitivos flutter que muestra un error

You can show material design snackbars using the following code:

Scaffold.of(context).showSnackBar(SnackBar(
      content:Text("New Notification"),));
 
In some cases,this will throw an error and it can be resolved using a workaround://Declare a GlobalKey
GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();//Assing this key to the scaffoldScaffold(
  key: _scaffoldKey,
  body:...)//finally in the topmost code use this key in the following way
_scaffoldKey.showSnackBar(SnackBar(
      content:Text("New Notification"),));

Ejemplo 2: cómo mostrar snackbar en flutter

You can show material design snackbars using the following code:

Scaffold.of(context).showSnackBar(SnackBar(
      content:Text("New Notification"),));
   
In some cases,this will throw an error and it can be resolved using a workaround://Declare a GlobalKey
GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();//Assing this key to the scaffoldScaffold(
  key: _scaffoldKey,
  body:...)//finally in the topmost code use this key in the following way
_scaffoldKey.showSnackBar(SnackBar(
      content:Text("New Notification"),));

Ejemplo 3: parte superior de la barra de aperitivos Flutter

RaisedButton(
  child:Text('Show Top Snackbar'),
  onPressed:()Flushbar(
      flushbarPosition: FlushbarPosition.TOP,)..title ="Hey Ninja"..message ="Lorem Ipsum is simply dummy text of the printing and typesetting industry"..duration =Duration(seconds:3)..show(context);,),

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