Flutter application design without AppBar

Question

I tried using this kind of approach to have all of my UI (here only a Text) in the application below the status bar, but witho

Answer 1

You can wrap the Scaffold into SafeArea, as below:

import 'package:flutter/material.dart';

void main() => runApp(MyApp(
  textInput: Text("Text Widget"),
));

class MyApp extends StatefulWidget {
  final Widget textInput;
  MyApp({this.textInput});

  @override
  State<StatefulWidget> createState() => MyAppState();
}

class MyAppState extends State<MyApp> {
  bool checkBoxValue = false;
  @override
  Widget build(BuildContext ctxt) {
    return new MaterialApp(
      home: SafeArea(
           child: Scaffold(
              body: new Center(
              child: new Column(
              children: <Widget>[
                widget.textInput,
                Checkbox(
                    value: checkBoxValue,
                    onChanged: (bool newValue){
                      setState(() {
                        checkBoxValue = newValue;
                      });
                    }
                )
              ],
            ))),
          ),
      );
  }
}

About the opposite, in case you do not need to keep repeating the AppBar in your multiple screens, you can create separate widget:

import 'package:flutter/material.dart';
import 'state.dart';

AppBar commonAppBar(String title, void action()) {
  return new AppBar(
    title: new Text(title),
    actions: [
      new IconButton(icon: new Icon(Icons.flip), onPressed: action),
      new IconButton(icon: new Icon(Icons.exit_to_app), onPressed: () {
        new StateSubject().switchToLogin();
      }),
    ],
  );
}

Answer 2

Wrap your page content (Text or Scaffold) inside a SafeArea widget

A widget that insets its child by sufficient padding to avoid intrusions by the operating system.

return new SafeArea(child: new Text('text widget'));