Check out example codes for "flutter snackbar showing error". It will help you in understanding the concepts better.
Code Example 1
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 scaffold Scaffold( key: _scaffoldKey, body: ... ) //finally in the topmost code use this key in the following way _scaffoldKey.showSnackBar(SnackBar( content: Text("New Notification"), ));
Learn ReactJs, React Native from akashmittal.com