What is Cordova?
Apache Cordova is an open-source mobile development framework that enables developers to build cross-platform mobile applications using standard web technologies such as HTML5, CSS3, and JavaScript. Originally developed by Nitobi and later acquired by Adobe, Cordova abstracts native device capabilities behind a consistent JavaScript API, allowing web applications to access native device functions like the camera, accelerometer, file system, and more.
Cordova acts as a container that wraps web applications and deploys them as native apps across multiple platforms, including iOS, Android, Windows, and others. This approach allows developers to write code once and run it on multiple mobile operating systems, significantly reducing development time and effort compared to native development.
What are the Major Use Cases of Cordova?
Cordova is widely used in scenarios where rapid development, code reuse, and multi-platform deployment are priorities:
1. Cross-Platform Mobile Apps
Build applications that run consistently across Android, iOS, and Windows devices without rewriting code in native languages.
2. Enterprise Mobile Solutions
Rapidly deploy internal business apps with access to device hardware and enterprise services while minimizing platform-specific development.
3. Prototyping and MVP Development
Quickly develop proof-of-concept or minimum viable products leveraging existing web development skills.
4. Hybrid App Development
Combine web technologies with native plugins for apps that require hardware features or platform-specific behavior.
5. Accessing Device Features
Leverage Cordova plugins to access cameras, GPS, contacts, accelerometers, push notifications, and other native device capabilities.
6. Progressive Web App (PWA) Enhancement
Convert PWAs into installable native apps by wrapping them in Cordova containers.
How Cordova Works Along with Architecture?
Cordova’s architecture provides a bridge between web technologies and native device functionality, enabling web apps to behave like native apps.
Core Components:
- WebView Container: Cordova hosts the app’s HTML/CSS/JavaScript inside a native WebView component. This WebView renders the UI just like a browser but runs full-screen as a native app.
- Cordova Engine: This is the native runtime that initializes the WebView and manages communication between JavaScript and native code.
- JavaScript APIs: Cordova provides JavaScript interfaces for accessing native device features. These APIs are implemented via native plugins.
- Plugins: Native code modules exposing device capabilities to the JavaScript layer. Plugins exist for camera, geolocation, file system, contacts, network status, and more.
Communication Flow:
- The web app calls a Cordova JavaScript API.
- The call is passed to native code via a bridge.
- Native code executes the required function.
- Results or events are sent back to the JavaScript layer.
This bridging mechanism abstracts platform differences, enabling a unified programming model.
Platform-Specific Wrappers
Cordova maintains separate platform projects (Android, iOS, Windows), each providing native implementations and build processes tailored to the platform.
What is the Basic Workflow of Cordova?
Developing an app with Cordova typically follows these steps:
1. Install Cordova CLI
Use Node.js package manager to install the Cordova command line interface.
2. Create a New Cordova Project
Generate a starter project scaffolding with default structure.
3. Add Target Platforms
Add desired mobile platforms to the project (e.g., Android, iOS).
4. Develop Web Assets
Write your app’s HTML, CSS, and JavaScript code inside the www directory.
5. Add Plugins
Include Cordova plugins to access native device functionality as needed.
6. Build and Run
Compile the app for your target platforms and run it on emulators or devices.
7. Test and Debug
Use browser tools and platform-specific debuggers to refine your app.
8. Deploy
Package and submit the app to app stores or distribute internally.
Step-by-Step Getting Started Guide for Cordova
Step 1: Install Prerequisites
Ensure you have Node.js and a suitable Java Development Kit (JDK) installed. Also, install platform-specific SDKs like Android Studio and Xcode for iOS.
Step 2: Install Cordova CLI
Open a terminal and run:
npm install -g cordova
Step 3: Create a New Project
cordova create MyApp com.example.myapp MyApp
cd MyApp
Step 4: Add Platforms
Add Android and iOS platforms:
cordova platform add android
cordova platform add ios
Step 5: Build Initial Project
cordova build
Step 6: Add Plugins
Add a plugin, for example the camera plugin:
cordova plugin add cordova-plugin-camera
Step 7: Develop Your App
Edit files in the www folder. Use Cordova’s JavaScript APIs to access native features:
navigator.camera.getPicture(onSuccess, onFail, { quality: 50, destinationType: Camera.DestinationType.DATA_URL });
function onSuccess(imageData) {
var image = document.getElementById('myImage');
image.src = "data:image/jpeg;base64," + imageData;
}
function onFail(message) {
alert('Failed because: ' + message);
}
Step 8: Run on Device or Emulator
For Android:
cordova run android
For iOS:
cordova run ios
Step 9: Debug and Iterate
Use Chrome DevTools or Safari Web Inspector to debug your app running on a device or emulator.
