lucalves

Stack(
  children: <Widget>[
    BaixoWidget(),
    MeioWidget(),
    CimaWidget(),
  ],
),

lucalves

import 'package:flutter/material.dart';

class StackFlutter extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Flutter Stack')),
      body: incluiStack(),
    );
  }

lucalves

Widget incluiStack() {
  return Stack(
    alignment: Alignment.center,
    children: <Widget>[
      Image.network(
        'https://i.imgur.com/fzgwYzq.png',
        width: double.infinity,
        height: double.infinity,
        fit: BoxFit.cover,
      ),

lucalves

import 'package:flutter/material.dart';
import 'package:stack_example/stack_flutter.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Stack',

lucalves

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Funcionamento do botão voltar',

lucalves

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:splashscreen/splashscreen.dart';
import 'home_screen.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {

lucalves

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:splashscreen/splashscreen.dart';
import 'home_screen.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {

lucalves

/* (320x480) iPhone (Original, 3G, 3GS) */
@media only screen and (min-device-width: 320px) and (max-device-width: 480px) {
    /* insert styles here */
}
 
/* (320x480) Smartphone, Portrait */
@media only screen and (device-width: 320px) and (orientation: portrait) {
    /* insert styles here */
}
 

lucalves

[
  {
    "id": "Hsi0nPw7nZQ"
  },
  {
    "id": "U9trUYVrI20"
  },
  {
    "id": "9kY_e0z1rvA"
  },

lucalves

{
  // Configurações da fonte FiraCode
  "editor.fontFamily": "Fira Code",
  "editor.fontLigatures": true,

  // Demais configurações
  "workbench.colorTheme": "Omni",
  "workbench.iconTheme": "material-icon-theme",
  "workbench.startupEditor": "newUntitledFile",