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Ionic Mobile App Development Training Chennai

Ionic Mobile App Development Training Chennai – Enroll Now!

Ionic Mobile app development trainingIonic is one of the most widely used mobile hybrid frameworks. It has more than 17,000 stars and more than 2,700 forks on GitHub at the time of writing this post. Ionic is built on top of AngularJS, a super heroic framework for building MVW apps. In this introductory chapter, we will take a look at AngularJS and understand how it powers Ionic. We will take a look at a couple of key AngularJS components, named directives, and services that are widely used when working with Ionic.

Ionic Mobile app development trainingServer-side web applications have been around for quite some time now. However, the Web is evolving at such a fast pace that we are driving applications from the client-side rather than the server-side. Gone are those days when the server dictates to the client about what activities to perform and what user interface to display.
Ionic Mobile app development training
With the extensive growth of asynchronous and highly interactive web pages, the user experience can be made better with client-side driven applications than server-side driven applications. As you already know, libraries such as jQuery and Zepto help us in achieving this quite easily.
Ionic Mobile app development trainingIf you’ve used other mobile development frameworks in the past, you should find Ionic fairly similar to use. But getting started with any framework is always daunting, so we will start simple and expand on some basic concepts. But first, we need to talk a bit about the Ionic project itself, where it fits into the dev stack, and why we built it.
What is AngularJS?
AngularJS is a JavaScript-based MV* framework that provides a strong backbone to scalable and complex web apps. It also enables developers to extend HTML and program their apps in a declarative paradigm in lieu of an imperative programming style.Ionic Mobile app development trainingAngularJS provides us with a way of creating reusable components, setting standard templates in HTML, and reusable business logic with the ability to bind data dynamically to it.
AngularJS is a perfect fit for creating rich Mobile UI Apps as it provides a robust structure to the frontend, which is a reason why the Ionic team has chosen it as their core.
What is Ionic, and where does it fit?

Ionic is an HTML5 mobile app development framework targeted at building hybrid mobile apps. Hybrid apps are essentially small websites running in a browser shell in an app that have access to the native platform layer. Hybrid apps have many benefits over pure native apps, specifically in terms of platform support, speed of development, and access to 3rd party code.Ionic Mobile app development

Think of Ionic as the front-end UI framework that handles all of the look and feel and UI interactions your app needs in order to be compelling. Kind of like “Bootstrap for Native,” but with support for a broad range of common native mobile components, slick animations, and beautiful design.

Unlike a responsive framework, Ionic comes with very native-styled mobile UI elements and layouts that you’d get with a native SDK on iOS or Android but didn’t really exist before on the web. Ionic also gives you some opinionated but powerful ways to build mobile applications that eclipse existing HTML5 development frameworks.

Since Ionic is an HTML5 framework, it needs a native wrapper like Cordova or PhoneGap in order to run as a native app. We strongly recommend using Cordova proper for your apps, and the Ionic tools will use Cordova underneath.

Ionic Mobile app development training

Building Hybrid Apps With Ionic

Those familiar with web development will find the structure of an Ionic app straightforward. At its core, it’s just a web page running in an native app shell! That means we can use any kind of HTML, CSS, and Javascript we want. The only difference is, instead of creating a website that others will link to, we are building a self-contained application experience.

The bulk of an Ionic app will be written in HTML, Javascript, and CSS. Eager developers might also dig down into the native layer with custom Cordova plugins or native code, but it’s not necessary to get a great app.

Ionic also uses AngularJS for a lot of the core functionality of the framework. While you can still use Ionic with just the CSS portion, we recommend investing in Angular as it’s one of the best ways to build browser-based applications today.
A common misconception is that a Hybrid Mobile Application cannot be installed on the device, but that is wrong. A Hybrid Mobile App is like any other Native Mobile App, which can be installed on devices and published using App stores. They can access the device hardware such as camera, accelerometer, GPS, and so on.
As we have discussed, there are multiple mobile platforms such as iOS, Android, Windows, plus many new ones such as Firefox OS and Tizen that have emerged lately.Ionic Mobile app development trainingThe development environment and programming languages are different for each of these. We have to code using Objective-C for iOS apps, Java (Android SDK) for Android apps, C#/ with XAML for Windows Phone apps. If any entity requires its mobile presence across all these platforms, multiple teams and different codebases need to be maintained, which is too cumbersome.
Hybrid Mobile Apps can be developed for multiple platforms using a single codebase. However, some specialized code needs to be written for each platform to harness the native APIs for it.
Anatomy of a Hybrid Mobile App
Hybrid Apps are no different from Native Mobile Apps that are installed on any mobile platform such as Android or iOS. On any platform, the core device APIs for hardware such as GPS, Camera, Accelerometer, and so on will be exposed by the Mobile OS. The following diagram shows the anatomy of Hybrid Mobile App:

Ionic Mobile app development training

Mobile Hybrid architecture

Before we start working with Ionic, we need to understand the bigger picture of the Mobile Hybrid platform.
The concept is pretty simple. Almost every mobile operating system (also called Platform when working with Cordova) has an API to develop apps. This API consists of a component named Web View. A Web View is typically a browser that runs inside the scope of a mobile application. This browser runs the HTML, CSS, and JS codes. This means that you can build a web page using the preceding technologies and then execute it inside your app.
You can use the same knowledge of web development to build native-hybrid mobile apps (here, native refers to installing the platform-specific format file on the device after it has been packaged along with the assets), for instance:
  • Android uses Android Application Package (.apk)
  • iOS uses iPhone Application Archive (.ipa)
  • Windows Phone uses Application Package (.xap)
The package/installer consists of a piece of native code that initializes the web page and a bunch of assets needed to show the web page content.
This setup of showing a web page inside the mobile app container that consists of your application business logic is called as a Hybrid App.
Apache Cordova
In simple terms, Cordova is the piece of software that stitches the web application and the native application together. The Apache Cordova website states that:
“Apache Cordova is a platform for building native mobile applications using HTML, CSS and JavaScript.”
Apache Cordova does not just stitch the web app with the native app, but it also provides a set of APIs written in JavaScript to interact with the native features of the device. Yes, you can use JavaScript to access your camera, take a picture, and send it in an e-mail. Sounds exciting, right?
To get a better understanding of what is happening, let’s take a look at the following image:
Ionic Mobile app development training
These APIs are consumed by the native code of your Hybrid Apps. All the components of Hybrid Apps are discussed in detail in the following section.
Custom WebView
Each native platform development kit has a component called WebView, which is nothing but a Chromeless browser control. WebView has the capability to open local or remote web content, which is exploited by Hybrid App frameworks to display the UI of the app using web technologies. This is the most important component of a Hybrid App and has a significant role in deciding the performance of the app.
WebViews in popular platforms such as iOS and Android used to have a different rendering engine and JavaScript engine than the latest browser (Chrome or Safari). Last year, Apple released a new control in its SDK called WKWebView, which uses all the performance optimization such as the Nitro JavaScript engine used by the Safari browser on iOS. On similar lines, Google also released an updated WebView, which uses the rendering engine and JavaScript runtime of Chromium (Chrome browser). Google has also launched a new feature called Updatable WebView from Android (5.0) Lollipop, which enables you to upgrade only the WebView of your Hybrid App.
Crosswalk is an interesting open source project that enables app developers to embed custom WebView into your Hybrid App. With these advancements, Hybrid Apps have become capable of using the latest web features such as WebRTC for real-time multimedia communication, and WebGL for advanced graphics rendering.
Native library
All the Hybrid App development frameworks based on WebView have their own native library. It comprises some basic utility functions that support the Hybrid App such as creating app configs, bootstrap code for Native Apps, customization for the WebView, common error/exception handling logic, and so on. The native library is specific to the mobile platform as it involves interacting with the core OS APIs and components.
The most popular framework, for example, Apache Cordova/Phonegap has an architecture of dividing its native library into a core section and pluggable components called plugins. This helps in reducing the bare minimum size of a Hybrid App. Developers can use only the plugins they require for a specific app. A plugin will include native code for a particular feature and a JavaScript interface exposing the native functionality. For example, if you want to use the Fingerprint Authentication API for iOS, you can just include the plugin for iOS and use it apart from the core. It also enables communities to contribute by developing open source plugins.
Native to JS Bridge
In a WebView-based Hybrid App, the UI is always written using web technologies, and JavaScript is the language for writing logic and hence we need to call our native code from JS and get results to JS also. A bridge has two functions, one is to enable JS to call any native methodIonic Mobile app development trainingand the other is to allow native methods to execute callbacks in JS. The bridge comprises different implementations in different platforms to call JS from native. For example, in Android, Java objects are marshalled into the WebView and can be called from the JS. In iOS, JS calls a specific URL scheme, which is interpreted by the native code. The reverse bridge is a simple global JS function that is called by the WebView passing special arguments such as callback results or specific commands.
As you can see, we have a web view where the HTML/CSS/JS code gets executed. This code can be a simple standalone piece of user interface; at best you are making an AJAX request to get some data from a remote server. Or, this code can do much more, like talking to the Bluetooth of the device and getting the list of devices in the vicinity.
In the latter case, Cordova has a bunch of APIs that interface with the web view using JavaScript and then talk to the device in its native language (for example, Java for Android), thus providing a bridge between them. For instance, if you would like to know more from theJavaScript about the device in which your app is running, all you need to do is write the following code inside the JS file:
var platform = device.platform;
After installing the device plugin, you can also access the UUID, model, OS version, and the Cordova version of the device from inside the web view using JavaScript as follows:
var uuid = device.uuid;
var model = device.model;
var version = device.version;
var Cordova = device.Cordova;
The preceding explanation was to give you an idea of how Mobile Hybrid apps are structured and how you can use device features from the web view using JavaScript.
Cordova does not convert the HTML, CSS, and JS code to an OS-specific binary code. All it does is wrap the HTML, CSS, and JS code and execute it inside a web view.
So, you must have guessed by now that Ionic is the framework with which we build the HTML/CSS/JS code that runs in the web view and talks with Cordova to access device specific APIs.
Ionic Installation
0/ Make sure java is installed and path is set
1/ Install  nodeJS (npm)
google nodejs and install from official site
2/ Install Cordova
npm install -g cordova
3/ Install ionic
npm install -g ionic
4/ Download the Android SDK
Go and download the Android SDK:
Add Android to PATH
(Installing Android SDK for running on emulator (for toast examples)). All other examples can be shown on the browser mostly
5/ Download Apache Ant (Mostly Optional)
Download and extract this zip file somewhere on your computer:
Add the full path to the bin/ folder to the end of your PATH environment variable.
Ionic mobile app development training Chennai
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