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Home > Mobile > Cross Platform Mobile Development > React Native Blueprints
React Native Blueprints
React Native Blueprints

React Native Blueprints: Create eight exciting native cross-platform mobile applications with JavaScript

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React Native Blueprints

RSS Reader

In this chapter, we will create an app which will be able to fetch, process, and show the user several RSS feeds. RSS is a web feed, which allows users to access updates to online content in a standardized and computer-readable format. They are normally used in news websites, news aggregators, forums, and blogs to represent updated content and it fits very well to the mobile world, as we can have all the content from different blogs or newspapers just by entering the feed's URL in one app.

An RSS feed reader will serve as an example on how to fetch external data, store it, and display it to the user, but at the same time, will add a bit of complexity to our state tree; we will need to store and manage lists of feeds, entries, and posts. On top of that, we will introduce MobX as a library to manage all those state models and update our views...

Overview

To better understand our RSS reader, let's take a look at how the app will look like once we finish it.

iOS: 

Android:

The home screen will display a list of the feeds already added by the user. It will also show a button (+) in the navigation header to add a new feed to the list. When that button is pressed, the app will navigate to the Add feed screen.

iOS:

Android:

Once a new feed has been added, it will show on the home screen and the user will be able to open it by simply tapping on it.

iOS:

Android:

At this stage, the app will retrieve the list of the updated entries for the selected feed and display it on a list. In the navigation header, a Trash icon will allow the user to remove the feed from the app. If the user is interested in any entries, she can click on it to display the full content for that entry.

iOS:

Android:

This last screen...

Setting up the folder structure

As we did in the first chapter, we need to initialize a new React Native project through React Native's CLI. This time, we will name our project RSSReader:

react-native init --version="0.49.3" RSSReader

For this app, we will need a total of four screens:

  • FeedList: This is a list containing the titles for the feeds which were added to the app sorted by the time they were added.
  • AddFeed: This is a simple form to allow the user to add a feed by sending its URL. We will here retrieve the feed details to finally add and save them in our app for later usage.
  • FeedDetail: This is a list containing the latest entries (retrieved before mounting the screen) belonging to the selected feed.
  • EntryDetail: This is a WebView showing the contents of the selected entry.

Besides the screens, we will include an actions.js file containing all the...

Managing our state with MobX

MobX is a library which makes state management simple and scalable by transparently applying functional reactive programming. The philosophy behind MobX is very simple: anything that can be derived from the application state, should be derived automatically. This philosophy applies to UI, data serialisation and server communication. 

Lots of documentation and examples of using MobX can be found on its website https://mobx.js.org/, although we will make a small introduction in this section to fully understand our app's code in this chapter.

The store

MobX uses the concept of "observable" properties. We should declare an object containing our general application...

Setting up the store

After understanding how MobX works, we are ready to create our store:

/*** src/store.js ** */

import { observable } from 'mobx';
import { AsyncStorage } from 'react-native';

class Store {
  @observable feeds;
  @observable selectedFeed;
  @observable selectedEntry;

  constructor() {
    AsyncStorage.getItem('@feeds').then(sFeeds => {
      this.feeds = JSON.parse(sFeeds) || [];
    });
  }

  _persistFeeds() {
    AsyncStorage.setItem('@feeds', JSON.stringify(this.feeds));
  }

  addFeed(url, feed) {
    this.feeds.push({
      url,
      entry: feed.entry,
      title: feed.title,
      updated: feed.updated,
    });
    this._persistFeeds();
  }

  removeFeed(url) {
    this.feeds = this.feeds.filter(f => f.url !== url);
    this._persistFeeds();
  }

  selectFeed(feed) {
    this.selectedFeed = feed;
  }

  selectEntry(entry) {
    this.selectedEntry...

Defining actions

There will be two types of actions in our app: those affecting a specific component's state and those affecting the general app state. We want to store the latter somewhere out of the component's code, so we can reuse and easily maintain them. An extended practice in MobX (and also Redux or Flux) apps is to create a file named actions.js, where we will store all the actions modifying business logic for our app. 

In the case of our RSS reader, the business logic revolves around feeds and entries, so we will capture all the logic dealing with these models in this file: 

/*** actions.js ** */

import store from './store';
import xml2json from 'simple-xml2json';

export async function fetchFeed(url) {
  const response = await fetch(url);
  const xml = await response.text();
  const json = xml2json.parser(xml);
  return {
    entry:
  ...

Overview

To better understand our RSS reader, let's take a look at how the app will look like once we finish it.

iOS: 

Android:

The home screen will display a list of the feeds already added by the user. It will also show a button (+) in the navigation header to add a new feed to the list. When that button is pressed, the app will navigate to the Add feed screen.

iOS:

Android:

Once a new feed has been added, it will show on the home screen and the user will be able to open it by simply tapping on it.

iOS:

Android:

At this stage, the app will retrieve the list of the updated entries for the selected feed and display it on a list. In the navigation header, a Trash icon will allow the user to remove the feed from the app. If the user is interested in any entries, she can click on it to display the full content for that entry.

iOS:

Android:

This last screen is basically a WebView, a lightweight browser opened by default in the URL, which is containing the content for the selected entry. The user will be...

Setting up the folder structure

As we did in the first chapter, we need to initialize a new React Native project through React Native's CLI. This time, we will name our project RSSReader:

react-native init --version="0.49.3" RSSReader

For this app, we will need a total of four screens:

  • FeedList: This is a list containing the titles for the feeds which were added to the app sorted by the time they were added.
  • AddFeed: This is a simple form to allow the user to add a feed by sending its URL. We will here retrieve the feed details to finally add and save them in our app for later usage.
  • FeedDetail: This is a list containing the latest entries (retrieved before mounting the screen) belonging to the selected feed.
  • EntryDetail: This is a WebView showing the contents of the selected entry.

Besides the screens, we will include an actions.js file containing all the user actions modifying the app's state. Although we will review how the state is managed in a later section, in detail, it's also important...

Managing our state with MobX

MobX is a library which makes state management simple and scalable by transparently applying functional reactive programming. The philosophy behind MobX is very simple: anything that can be derived from the application state, should be derived automatically. This philosophy applies to UI, data serialisation and server communication. 

Lots of documentation and examples of using MobX can be found on its website https://mobx.js.org/, although we will make a small introduction in this section to fully understand our app's code in this chapter.

The store

MobX uses the concept of "observable" properties. We should declare an object containing our general application's state, which will hold and declare those observable properties. When we modify one of these properties, all the subscribed observers will be updated by MobX automatically. This is the basic principle behind MobX, so let's take a look at a sample code:

/*** src/store.js ***/

import {observable} from 'mobx...

Setting up the store

After understanding how MobX works, we are ready to create our store:

/*** src/store.js ** */

import { observable } from 'mobx';
import { AsyncStorage } from 'react-native';

class Store {
  @observable feeds;
  @observable selectedFeed;
  @observable selectedEntry;

  constructor() {
    AsyncStorage.getItem('@feeds').then(sFeeds => {
      this.feeds = JSON.parse(sFeeds) || [];
    });
  }

  _persistFeeds() {
    AsyncStorage.setItem('@feeds', JSON.stringify(this.feeds));
  }

  addFeed(url, feed) {
    this.feeds.push({
      url,
      entry: feed.entry,
      title: feed.title,
      updated: feed.updated,
    });
    this._persistFeeds();
  }

  removeFeed(url) {
    this.feeds = this.feeds.filter(f => f.url !== url);
    this._persistFeeds();
  }

  selectFeed(feed) {
    this.selectedFeed = feed;
  }

  selectEntry(entry) {
    this.selectedEntry = entry;
  }
}

const store = new Store();
export default store;

We have already seen the basic structure of...

Defining actions

There will be two types of actions in our app: those affecting a specific component's state and those affecting the general app state. We want to store the latter somewhere out of the component's code, so we can reuse and easily maintain them. An extended practice in MobX (and also Redux or Flux) apps is to create a file named actions.js, where we will store all the actions modifying business logic for our app. 

In the case of our RSS reader, the business logic revolves around feeds and entries, so we will capture all the logic dealing with these models in this file: 

/*** actions.js ** */

import store from './store';
import xml2json from 'simple-xml2json';

export async function fetchFeed(url) {
  const response = await fetch(url);
  const xml = await response.text();
  const json = xml2json.parser(xml);
  return {
    entry:
      (json.feed && json.feed.entry) || (json.rss && 
      json.rss.channel.item),
    title:
      (json.feed && json.feed...

Creating our app's entry point

All React Native apps have one entry file: index.js,  we will delegate the root of the component's tree to our src/main.js file:

/*** index.js ***/

import { AppRegistry } from 'react-native';
import App from './src/main';
AppRegistry.registerComponent('rssReader', () => App);

We will also register our app with the operating system.

Now, let's take a look at the src/main.js file to understand how we will set up navigation and start up our component's tree:

/** * src/main.js ***/

import React from 'react';
import { StackNavigator } from 'react-navigation';

import FeedsList from './screens/FeedsList.js';
import FeedDetail from './screens/FeedDetail.js';
import EntryDetail from './screens/EntryDetail.js';
import AddFeed from './screens/AddFeed.js';

import store from './store';

const Navigator = StackNavigator({
  FeedsList: { screen: FeedsList },
  FeedDetail: { screen: FeedDetail },
  EntryDetail: { screen: EntryDetail },
  AddFeed: { screen: AddFeed },
}...
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Key benefits

  • ? Build quirky and fun projects from scratch and become efficient with React Native
  • ? Learn to build professional Android and iOS applications with your JavaScript skills
  • ? Use Isomorphic principles to build mobile apps that offer a native user experience

Description

Considering the success of the React framework, Facebook recently introduced a new mobile development framework called React Native. With React Native's game-changing approach to hybrid mobile development, you can build native mobile applications that are much more powerful, interactive, and faster by using JavaScript This project-based guide takes you through eight projects to help you gain a sound understanding of the framework and helps you build mobile apps with native user experience. Starting with a simple standalone groceries list app, you will progressively move on to building advanced apps by adding connectivity with external APIs, using native features, such as the camera or microphone, in the mobile device, integrating with state management libraries such as Redux or MobX, or leveraging React Native’s performance by building a full-featured game. This book covers the entire feature set of React Native, starting from the simplest (layout or navigation libraries) to the most advanced (integration with native code) features. By the end of this book, you’ll be able to build professional Android and iOS applications using React Native.

Who is this book for?

This book is for developers who want to use their JavaScript knowledge for mobile development. Prior knowledge of React will be beneficial.

What you will learn

  • ? Structure React Native projects to ease maintenance and extensibility
  • ? Optimize a project to speed up development
  • ? Make a React Native project production-ready
  • ? Use external modules to speed up the development and maintenance of your projects
  • ? Explore the different UI and code patterns to be used for iOS and Android
  • ? Get to know the best practices when building apps in React Native
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Nov 08, 2017
Length: 346 pages
Edition : 1st
Language : English
ISBN-13 : 9781787288096
Vendor :
Facebook
Category :
Mobile
Languages :
JavaScript
Concepts :
Cross Platform Mobile Development
Tools :
React

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Product feature icon Paperback book shipped to your preferred address
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Estimated delivery fee Deliver to Turkey

Standard delivery 10 - 13 business days

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Product Details

Publication date : Nov 08, 2017
Length: 346 pages
Edition : 1st
Language : English
ISBN-13 : 9781787288096
Vendor :
Facebook
Category :
Mobile
Languages :
JavaScript
Concepts :
Cross Platform Mobile Development
Tools :
React

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Table of Contents

8 Chapters
Shopping List Chevron down icon Chevron up icon
Shopping List
Overview
Setting up our project
Setting up the folder structure
Adding a Navigation component
Styling our app with NativeBase
Building the ShoppingList screen
Building the AddProduct screen
Installing and distributing the app
Summary
RSS Reader Chevron down icon Chevron up icon
RSS Reader
Overview
Setting up the folder structure
Managing our state with MobX
Setting up the store
Defining actions
Creating our app's entry point
Building the FeedsList screen
Building the AddFeed screen
Building the FeedDetail screen
Building the EntryDetail screen
Summary
Car Booking App Chevron down icon Chevron up icon
Car Booking App
Overview
Setting up the folder structure
Running the app in the simulator
Creating our app's entry point
LocationSearch
LocationPin
ClassSelection
ConfirmationModal
Summary
Image Sharing App Chevron down icon Chevron up icon
Image Sharing App
Overview
Setting up the folder structure
Redux
ImagesList
Gallery
Header
ActivityIndicator
Camera
MyImages
ImageGrid
Actions
Reducers
API
Summary
Guitar Tuner Chevron down icon Chevron up icon
Guitar Tuner
Overview
Setting up the folder structure
Writing the native module
index.ios.js
Tuner
Strings
Adding an icon
Adding a launch screen
Disabling the landscape mode
Summary
Messaging App Chevron down icon Chevron up icon
Messaging App
Overview
Firebase
Setting up the folder structure
Users store
Chats store
Push notifications using Firebase
Login
Chats
ListItem
Chat
Search
Profile
Summary
Game Chevron down icon Chevron up icon
Game
Overview
Sprites
Setting up the folder structure
GameContainer
Actions
Reducer
The sprites module
Constants
Parrot
RockUp and RockDown
Ground
Score
Start
GameOver
StartAgain
Summary
E-Commerce App Chevron down icon Chevron up icon
E-Commerce App
Overview
Setting up the folder structure
Linting and code formatting
Indexes and main files
Reducers
API
ProductList
ProductDetail
MyCart
Payment
PaymentConfirmation
MyProfile
LoginOrRegister
Register
Sales
Summary

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8
(4 Ratings)
5 star 25%
4 star 50%
3 star 0%
2 star 25%
1 star 0%
Sebastian Galiano Dec 16, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Probably one of the best books in the market to learn how to build mobile applications using React Native. It gave me the insights and examples needed to start developing react native apps.
Amazon Verified review Amazon
JH Apr 09, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This book seems well organized and good intentioned but it is not very clear how to get the demo apps to run, partially that one of the side-effects of React Native as a world that evolves quickly. Wish some more care was given to the nuances of a Firebase installation and so on but since that technology also changes so fast, maybe this is asking for the impossible.
Amazon Verified review Amazon
Vincent A. Jan 13, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Good book! A couple of things could have been done better. The chapters don't match the samples gotten from the web.. But a good book overall.
Amazon Verified review Amazon
Rhys Oct 19, 2019
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
This appears to have been a good book on react native for the beginner.However it is now two years since publication and things have moved on.Many of the functions used in the code examples of book have been deprecated in the latest versions and will no longer work. Trying to get the older version of the framework may require some additional messing about with simulators.If you are a total beginner try to find something more up to date to avoid additional stress.
Amazon Verified review Amazon

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About the author

Profile icon Martinez
Martinez
Emilio Rodriguez Martinez is a senior software engineer who has been working on highly demanding JavaScript projects since 2010. He transitioned from web development positions into mobile development, first with hybrid technologies such as Cordova and then with native JavaScript solutions such as Titanium. In 2015, he focused on the development and maintenance of several apps built in React Native, some of which were featured in Apple's App Store as the top apps of the week. He is also an active contributor to React Native's codebase and Stack Overflow, where he provides advice on React and React Native questions.
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FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela