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Windows Quick Installation Guide

Reference

Installation Guide

Go to the Edit the system environment variables

Go to Environment Variables

Edit the Path entry

Append the full path to Flutter. For example: C:\dev\flutter\bin

Open a console Window to test Flutter, writting where flutter dart

Select all the parts that you have to install (android-sdk-license with Android SDK, Android SDK Command-line Tools, and Android SDK Build-Tools, and others)

  • Run the command flutter config --android-studio-dir="" where is the path where Android Studio is located. For example flutter config --android-studio-dir="C:\Program Files\Android\Android Studio"

  • Open Android Studio

Open SDK Manager

Select the tab SDK Tools

Uncheck the option Hide Obsolete Packages, and select Android SDK Tools and Android SDK Command-line Tools

Press the OK button to install these packages

  • Execute the command flutter doctor --android-licenses to check the licenses selecting the key Y to accept all pages

  • Run flutter doctor to check if all is installed correctly

image

Start here!

Executed under GitHub Gist

Android Studio

Error - Android sdkmanager not found. Update to the latest Android SDK and ensure that the cmdline-tools are installed to resolve this

To solve this issue you need to install Android SDK Tools and Android SDK Command-line Tools on SDK Manager

  • Open Android Studio
  • Open SDK Manager
  • Select the tab SDK Tools
  • Uncheck the option Hide Obsolete Packages, and select Android SDK Tools and Android SDK Command-line Tools
  • Press the OK button to install these packages

Execute the command flutter doctor --android-licenses to check if the error still occurs then check the android_sdk_path\Android\SDK\cmdline-tools

If you find more than one latest folders, delete the last one and remane the other latest folder (like latest-2 for example) to latest

The error should disappear now

Xcode

Troubleshooting CocoaPods

Update to macOS 11.x or upper

On you mac, open a terminal window and execute the next command to know what type of macOS you have

system_profiler SPHardwareDataType | grep 'Model Identifier'

VERSION NAME DATE ANNOUNCED
RHAPSODY DEVELOPER RELEASE Grail1Z4 / Titan1U (Interno) January, 1997
MAC OS X SERVER 1.0 Hera (Interno) Unknown
MAC OS X DEVELOPER PREVIEW - May, 1998
MAC OS X PUBLIC BETA Kodiak (Interno) May, 2000
MAC OS X 10.0 Cheetah January, 2001
MAC OS X 10.1 Puma July, 2001
MAC OS X 10.2 Jaguar May, 2002
MAC OS X 10.3 Panther June, 2003
MAC OS X 10.4 Tiger May, 2004
MAC OS X 10.5 Leopard June, 2006
MAC OS X 10.6 Snow Leopard June, 2008
MAC OS X 10.7 Lion October, 2010
OS X 10.8 Mountain Lion February, 2012
OS X 10.9 Mavericks June, 2013
OS X 10.10 Yosemite June, 2014
OS X 10.11 El Capitan June, 2015
MACOS 10.12 Sierra June, 2016
MACOS 10.13 High Sierra June, 2017
MACOS 10.14 Mojave June, 2018
MACOS 10.15 Catalina June, 2019
MACOS 11 Big Sur June, 2020
MACOS 12 Monterey June, 2021
MACOS 13 Ventura June, 2022
MACOS 14 Sonoma June, 2023

Visual Studio Code

I use Visual Studio Code as editor code

The extensions I use are:

Firebase

  1. Install Firebase CLI or using the automatic install script curl -sL https://firebase.tools | bash
  2. Log into Firebase firebase login
  3. Test that the CLI is properly installed firebase projects:list
  4. Optional - update the CLI version (macOS) curl -sL https://firebase.tools | upgrade=true bash

Sharing and Testing the Code

  • To test the samples online, I am using DartPad. There is a Sharing Guide with details about how to share your samples and code online for other people

Guides and Learning Paths

The Dart tool uses Google Analytics to report feature usage statistics and to send basic crash reports. This data is used to help improve the Dart platform and tools over time

To disable reporting of telemetry and analytics, run:

dart --disable-analytics
dart --disable-telemetry

Analytics reporting disabled. In order to enable it, run:

dart --enable-analytics

Flutter Commands

General commands

  • Get Flutter Help flutter --help --verbose
  • Check Flutter Health flutter doctor
  • Check the version of Flutter installed flutter --version
  • Upgrade Flutter flutter upgrade (to upgrade Flutter with the last stable version)

If you receive an error similar to Unknown flutter tag. Abandoning upgrade to avoid destroying local changes. It is recommended to use git directly if not working on an official channel when you execute the command flutter upgrade, you could try the command flutter upgrade --force instead. In this case and after do this, execute the command flutter doctor as well to check that all is ok

Flutter App commands

  • Create a Flutter App flutter create <app_name>
  • Analyze a Flutter App flutter analyze
  • Run Unit Tests flutter test or flutter directory_test or flutter test <file_test.dart>
  • Install a Flutter Package flutter pub add <package_name>
  • Get the Flutter packages for the project flutter packages get
  • Get the Flutter project with the packages found in pubspec.yaml flutter pub get
  • Update the Flutter packages flutter pub update
  • Run App flutter run
  • List available emulators flutter emulators
  • Install Flutter App on a Device flutter install -d <device_id>
  • Build a Flutter App flutter build <type_of_app> (for example: flutter build ios or flutter build apk)

Flutter Packages

Flutter Local Offline Databases

Flutter Online Databases

Flutter Backend

Flutter App Architecture and Project Structure

Main steps when we start a new Flutter App

The App Architecture will force us to define the layers and boundaries of the App The layers and boundaries will help us to define the folders and Project Structure

  1. Decide the App Architecture to use
  2. Choose the Project Structure

Notes about the App Architecture

In general is very important, and critical for complex apps or projects, decide the App Architecture before start a project, because it will help us to handle the bounders, complexity and productivity of it in the correct way

Popular or familiar App Architectures used long ago (and today), are MVC, MVP, MVVM and Clean Architecture. To be honest, MVC, MVP and MVVM are design patterns, and Clean Architecture defines a set of rules and principles for complex solutions or projects, but are not good Architectures to use them with Flutter

In the other hand we have some alternatives:

  1. Bloc Architecture has an important popularity. Bloc Library has helped to adopt this Architecture for Flutter Apps. This Architecture gives us a strict set of rules about how to structure our Flutter Apps. Bloc Library rely on Provider Package, which is the recommended package for state management. More details about BLoC in Spanish

  2. Stacke Architecture based in the Stacked package and inspired by MVVM. Stacked package rely on Provider Package, which is the recommended package for state management

  3. Riverpod Package, created by the Provider Package's author could help us to create our own Architecture. This package is a good package for dependency injection and state management

  4. Custom Architecture, depending of our experiences. Good to be more flexible and cover all possibilities, because sometimes, a type of Architecture could be a good idea for a project, but a bad one for other project, so open your mind about that is possible that not all projects should be use the same type of Architecture always

Architecture Layers

Taking our App as an all, we could slice our App in four layers

  • Presentation Layer
  • Application Layer
  • Domain Layer
  • Data Layer

Flutter App Architecture

But we could think in a less complex Architecture with three layers only

  • Presentation Layer
  • Application Layer
  • Data Layer

Flutter App Architecture

UI Layer and/or Presentation Layer

This layer would store the Widgets, States, Controllers and Commands, and should be focused in the Presentation Logic

Application Layer or Business Layer, and Domain Layer

This layer would store the Services, Mappings, Components, Caching, Instrumentation, Processors, Configuration and Models or Entities, and should be focused in the Business Rules (enterprise business rules and application business rules)

Data Layer

This layer would store the Repositories, DTOs, Data Utilities and Data Providers, and should be focused in the Data Access and how the data is returned to the caller

The ideal scenario when we develop a new project, is organize our projects by a set of features (functional requirement, user story, or oriented to domain), and inside of each feature, their layers

When we create, edit/modify, or delete a feature, we can focus in the feature as an independent feature

And when we create our test coverage of each feature, we can focus in it to cover the unit tests with confidence

Later, we can explore the integration and acceptance tests too in the same way

Flutter App Architecture

Flutter App Architecture

References

Flutter Language Specification Draft

This is my own document about Flutter to help to the developer, to create their own Flutter samples. Is not a bible, just a helper document

You can find it here

Flutter Icons

Flutter custom icons generator

C# to Dart

C# to Dart (quick reference)

Flutter-Samples

Quick Flutter resources and samples

  1. Create the flutter project flutter create <name>
  2. Overwrite the lib folder with the sample code
  3. Optional flutter packages get and flutter run

General Samples

#A30204 All samples tested with Flutter 3

  • Add or Remove and element
  • Alert Dialog Box
  • Animated Builder
  • Animated Cross Fade
  • Animated Default Text Style
  • Bottom Navigation Bar
  • Button Full Width
  • Button Multiple Toggle Switch
  • Button Toggle Switch
  • Calculator
  • Circular Loading Indicator
  • Combo Box
  • Date Picker
  • Dialog Box with 2 buttons
  • Dialog Box with 3 buttons
  • Form Dialog Box
  • Future
  • Horizotal Toolbar
  • Http Get and Post
  • Icon Text
  • Linear Loading Indicator
  • ListTile with Rounded Borders
  • Load Base64 Image
  • Load JSON File
  • Load SVG Image
  • Login Page
  • Login Page With Release
  • Markdown Text
  • Opacity
  • Opacity with Linear Gradient
  • Play Sound File
  • Rating
  • Rounded Bottom Navigation Bar
  • Routes
  • Sqlite Sample
  • Switch Button
  • Switch Cover Button
  • Text Field Search Box
  • ToDo List

macOS Samples

#A30204 All samples tested with Flutter 3

  • CheckBox with button
  • Tab with pages
  • ToolBar with button
  • ToolBar with text in the center
  • ToolBar with text only

Tests Samples

#A30204 All samples tested with Flutter 3

  • Counter Test
  • Custom Exception Test
  • Exception Test
  • Sum Test

Quick Templates

Template without AppBar

This is a template of a Flutter app with a black screen. You can use it as a canvas of a blank app

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MyPageApp(),
    );
  }
}

class MyPageApp extends StatefulWidget {
  const MyPageApp({Key? key}) : super(key: key);

  @override
  State<MyPageApp> createState() => MyPageAppState();
}

class MyPageAppState extends State<MyPageApp> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        color: Colors.white,
        child: const Center(
          child: Text(
            'demo',
            style: TextStyle(
                color: Colors.pink, fontSize: 48, fontWeight: FontWeight.bold),
          ),
        ),
      ),
    );
  }
}

Template with AppBar

This is a template of a Flutter app with an App Bar. You can use it as a canvas of a blank app

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        backgroundColor: const Color.fromARGB(97, 60, 90, 200),
        foregroundColor: Colors.white70,
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: const <Widget>[
            Text(
              'demo',
              style: TextStyle(
                  color: Colors.blue,
                  fontSize: 48,
                  fontWeight: FontWeight.bold),
            ),
          ],
        ),
      ),
    );
  }
}

Flet

Framework that enables you to easily build real-time web, mobile, and desktop apps

Flet is language-agnostic, so anyone on your team could develop Flet apps in their favorite language. At the moment, Python is supported, and Go, C# are coming next

Write a monolith stateful app in Python only and get multi-user, real-time Single-Page Application (SPA)

Flet UI is built with Flutter

Requirements

  • An editor or your favorite IDE like Microsoft Visual Studio Code (no SDKs, dependencies or complex tooling)
  • Install flet pip install flet

Commands

  • python -m venv venv to create a virtual environment
  • source ./venv/bin/activate or source ./venv/Scripts/activate or .\venv\Scripts\activate to activate the virtual environment
  • python name.py to run the program
  • pip install flet to install flet
  • flet .\name.py to run the app quickly
  • pip install flet --upgrade to upgrate flet

Samples to move from skeleton to functional

Basic Sekeleton

import flet as ft

def main(page):
    pass

ft.app(target=main)

Hello World sample

import flet as ft

def main(page: ft.Page):
    page.add(ft.Text(value="Hello Flet!"))

ft.app(target=main)

Hello World sample (Async)

import flet as ft

async def main(page: ft.Page):
    await page.add_async(ft.Text(value="Hello Flet!"))

ft.app(target=main)

Main Window with standard properties

import flet as ft

def main(page: ft.Page):
    page.window_width = 360
    page.window_height = 640
    page.window_resizable = False
    page.padding = 0

    window_container = ft.Container(width=360, height=640, bgcolor=ft.colors.BLUE, alignment=ft.alignment.top_center)

    await page.add_async(container)

ft.app(target=main)

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Quick Flutter resources and samples

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android windows macos dart ios demo web cross-platform tips tricks desktop samples poc flutter flutter-apps dart-platform

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