• Flutter Layout Widgets
• Flutter Cheat Sheet Pdf
• Flutter Cheat Sheet Github
• Flutter Column Cheat Sheet

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• Using literals
• Chaining method calls
• Dealing with null
• Implementing functions
• Implementing constructors

This cheatsheet is based on an internal documentcreated by Googler Mehmet Fidanboyluto help Google engineers remember the syntax forsome of Dart’s commonly used features.For an interactive guide to these features and more, see theDart cheatsheet codelab.

1. Go-to Flutter Cheat Sheet in 2021. Go-to Flutter Cheat Sheet in 2021. November 24, 2020. Author: Zsolt Nagy.
2. Hi, my name is Shivam, This is a flutter tutorial for beginners, some useful flutter commands or cli commands that a developer should know or you can say flutter commands cheat sheet. These list of flutter commands executed on command prompt. NOTE: There are still some commands left which will be updated soon in this article. If you feel any.
3. A quick cheatsheet of useful snippet for Flutter. A widget is the basic type of controller in Flutter Material. There are two type of basic Widget we can extend our classes: StatefulWidget or StatelessWidget. StatefulWidget are all the widget that interally have a dynamic value that can change during usage.

Using literals

‘Substitution ${val}’

Puts the value of val into a string literal.Equivalent: ‘Substitution’ + val

<type>[ ]

Creates an object of type List<type>.Equivalent: new List<type>();

const [1, 2, 3]

Creates a compile-time constant list.

= { }

Initializes a map.Equivalent: new Map<>();

Declaring fields

Checking types

Chaining method calls

a..b = true..c = 5;

Cascade used for chaining access to methods and other members.Equivalent: a.b = true; a.c = 5;

Dealing with null

b ??= val;

If b is null, assign the value of val to b;otherwise, b stays the same.

a = value ?? 0;

If value is null, set a to 0.Otherwise, set a to value.

a?.b

Conditional access.Equivalent: a null ? null : a.b

Implementing functions

fn({bool bold: false, bool hidden: false})

Named params with default values.

int incr(int a) => a + 1;

Single return statement can be abbreviated.

Handling exceptions

Use on to catch a type.Use catch to catch an instance.

Implementing constructors

Normal constructor

Factory constructor

Use factory when implementing a constructor thatdoesn’t always create a new instance.

Named constructor

Delegating constructor

Const constructor

Produces an object that will never change. All vars have to be final.

Initializer list

Initializer lists are handy when setting up final fields.

Flutter Firebase Cheat Sheet covers firebase service for the rapid development of flutter applications such as Authentication, posting data and retrieving data from cloud firestore, Uploading an image(cloud storage) on firebase and Push notification(device to device and topic subscription) by firebase messaging.

Firebase is a development platform created by firebase which is currently managed google. firebase provides a variety of tools and services for rapid development.

We have to set up firebase SDK in flutter before using any of its services. create new Firebase project then select android plate form.

Enter app package name copy it from android/app/src/main/AndroidManifest.xml you can also give app nickname that is totally optional. but make sure of entering SHA-1 as it’s required for authentication. you can get your SHA-1 just copy the below code in the terminal for more details(client-auth).

Mac/Linux

Windows

Download google_services.json

Flutter Firebase Authentication

Authentication is required to be implemented in most of the applications for authorizing users to access flutter screens. firebase gives a variety of authentication options. In this blog email, password and phone authentication.

Flutter Layout Widgets

Add dependencies: firebase_auth: in pubspec.yaml file then install it by flutter pub get in your terminal and import ‘package:firebase_auth/firebase_auth.dart’; in your dart file.more detail(https://pub.dev/packages/firebase_auth#-installing-tab-)

Email And Password-based Authentication

Register User

Login user

Flutter Firebase Phone Authentication

Flutter Cheat Sheet Pdf

Firebase phone authentication is the most common way for authenticating users. flutter firebase phone authentication is easy to implement.

Check current user detail

Flutter Firebase Cloud firestore

Firebase gives you the power of storing data in NoSQL formate.in cloud firestore we can perform complex Querys such as AND, OR, EQUAL TO very easily. data can be added modified or deleted in Flutter FirebaseCloud Firestore in realtime.

Add dependencies: cloud_firestore: in pubspec.yaml file then install it by flutter pub get in your terminal and import‘package:cloud_firestore/cloud_firestore.dart’;in your dart file more detail(cloud_firestore).

Add data

• Update data

• Delete data

• Fetch data

Check if data exists in cloudfirestore!

Flutter Firebase Storage

For storing files in firebase provided its own storing services. In this Flutter Firebase Storage we will see how we can store the image in firebase storage for that we have to use one more plugin to get a file path either from the camera or gallery of the phone.

upload.dart

FirebasePush notification(Cloud Messaging)

Flutter Cheat Sheet Github

We can send app notifications in a flutter by using a firebase cloud messaging service in a flutter. In this, we will see how we can send notifications from one device to another ie. device to device notification and notification with a topic subscription. we also need the Server key of cloud messaging you can get it from project settings in the cloud messaging tab.

Device to device notification

Before sending notification from one device to other we need to store the token in the database.

Topic Subscription

Flutter Column Cheat Sheet

In topic subscription, we need to subscribe to a topic then send a notification on that topic added by the device.