Flutter Scaffold widget Code Example

In this Google flutter code example we are going to learn how to use scaffold widget in Flutter.

Flutter scaffold widget provide access to other widget.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'scaffold.dart";

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: BasicScaffold(),
    );
  }
}

scaffold.dart

import 'package:flutter/material.dart';

class BasicScaffold extends StatelessWidget {
  //Implements the basic material design visual layout structure.

//Provides APIs for showing drawers, snack bars, and bottom sheets.

//here, we set the key for our Scaffold Widget so we can access methods like showSnackBar, showBottomSheet etc from the context
  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      //set our specified key here
      key: _scaffoldKey,
      //to use an AppBar
      appBar: AppBar(title: Text("Scaffold Widget")),
      //to display a drawer
      drawer: Drawer(),
      //to add bottom app bar
      bottomNavigationBar: BottomAppBar(
        color: Colors.red,
        child: Container(height: 50.0),
      ),
      //to display a FAB
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          //we use our key to display a snackbar
          _scaffoldKey.currentState.showSnackBar(SnackBar(
            content: Text("Snakbar displayed"),
            action: SnackBarAction(
              label: "Go Back",
              onPressed: () {
                if (Navigator.of(context).canPop()) {
                  Navigator.of(context).pop();
                }
              },
            ),
          ));
        },
        child: Icon(Icons.favorite),
      ),
      //and, set  the FAB Location
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
    );
  }
}

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