divide screen into two equal parts in flutter

Question

Below is my screen, I am trying to get

 body: SafeArea(
        child: Column(
          children: [
            Expanded(child:
                  


        

Answer 1

Using an Expanded widget makes a child of a Row, Column, or Flex expand to fill the available space in the main axis (e.g., horizontally for a Row or vertically for a Column). If multiple children are expanded, the available space is divided among them according to the flex factor.

https://docs.flutter.io/flutter/widgets/Expanded-class.html

Column(
  children: [
    Expanded(
      child: TopWidget()
    ),
    CenterWidget(),
    Expanded(
      child: BottomWidget()
    ),
  ]
)

Edit: full source code here

import 'package:flutter/material.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',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State {

  @override
  Widget build(BuildContext context) {
    return Column(
        children: [
          Expanded(
              child: Container(
                color: Colors.green,
              )
          ),
          Container(
              height: 40,
              color: Colors.grey
          ),
          Expanded(
              child: Container(
                color: Colors.blueGrey,
              )
          ),
        ]
    );
  }
}

Edit 2: and result here