# Create your first Cordova app

### Create your first Cordova app

This guide shows you how to create a JS/HTML Cordova application and deploy them to various native mobile platforms using the cordova command-line interface (CLI). For detailed reference on Cordova command-line, review the CLI reference

### Installing the Cordova CLI

The Cordova command-line tool is distributed as an npm package.

To install the cordova command-line tool, follow these steps:

1. Download and install Node.js. On installation you should be able to invoke node and npm on your command line.

2. (Optional) Download and install a git client, if you don't already have one. Following installation, you should be able to invoke git on your command line. The CLI uses it to download assets when they are referenced using a url to a git repo.

3. Install the cordova module using npm utility of Node.js. The cordova module will automatically be downloaded by the npm utility.

• on OS X and Linux:

$sudo npm install -g cordova  On OS X and Linux, prefixing the npm command with sudo may be necessary to install this development utility in otherwise restricted directories such as /usr/local/share. If you are using the optional nvm/nave tool or have write access to the install directory, you may be able to omit the sudo prefix. There are more tips available on using npm without sudo, if you desire to do that. • on Windows: C:\>npm install -g cordova  The -g flag above tells npm to install cordova globally. Otherwise it will be installed in the node_modules subdirectory of the current working directory. Following installation, you should be able to run cordova on the command line with no arguments and it should print help text. ### Create the App Go to the directory where you maintain your source code, and create a cordova project: $ cordova create hello com.example.hello HelloWorld


This creates the required directory structure for your cordova app. By default, the cordova create script generates a skeletal web-based application whose home page is the project's www/index.html file.

All subsequent commands need to be run within the project's directory, or any subdirectories:

$cd hello  Add the platforms that you want to target your app. We will add the 'ios' and 'android' platform and ensure they get saved to config.xml: $ cordova platform add ios --save
$cordova platform add android --save  To check your current set of platforms: $ cordova platform ls


Running commands to add or remove platforms affects the contents of the project's platforms directory, where each specified platform appears as a subdirectory.

Note: When using the CLI to build your application, you should not edit any files in the /platforms/ directory. The files in this directory are routinely overwritten when preparing applications for building, or when plugins are re-installed.

### Install pre-requisites for building

To build and run apps, you need to install SDKs for each platform you wish to target. Alternatively, if you are using browser for development you can use browser platform which does not require any platform SDKs.

To check if you satisfy requirements for building the platform:

$cordova requirements Requirements check results for android: Java JDK: installed . Android SDK: installed Android target: installed android-19,android-21,android-22,android-23,Google Inc.:Google APIs:19,Google Inc.:Google APIs (x86 System Image):19,Google Inc.:Google APIs:23 Gradle: installed Requirements check results for ios: Apple OS X: not installed Cordova tooling for iOS requires Apple OS X Error: Some of requirements check failed  ### See Also ### Build the App By default, cordova create script generates a skeletal web-based application whose start page is the project's www/index.html file. Any initialization should be specified as part of the deviceready event handler defined in www/js/index.js. Run the following command to build the project for all platforms: $ cordova build


You can optionally limit the scope of each build to specific platforms - 'ios' in this case:

$cordova build ios  ### See Also ### Test the App SDKs for mobile platforms often come bundled with emulators that execute a device image, so that you can launch the app from the home screen and see how it interacts with many platform features. Run a command such as the following to rebuild the app and view it within a specific platform's emulator: $ cordova emulate android


Following up with the cordova emulate command refreshes the emulator image to display the latest application, which is now available for launch from the home screen:

Alternately, you can plug the handset into your computer and test the app directly:

$cordova run android  Before running this command, you need to set up the device for testing, following procedures that vary for each platform. ### See Also ### Add Plugins You can modify the default generated app to take advantage of standard web technologies, but for the app to access device-level features, you need to add plugins. A plugin exposes a Javascript API for native SDK functionality. Plugins are typically hosted on npm and you can search for them on the plugin search page. Some key APIs are provided by the Apache Cordova open source project and these are referred to as Core Plugin APIs. You can also use the CLI to launch the search page: $ cordova plugin search camera


To add the camera plugin, we will specify the npm package name for the camera plugin:

$cordova plugin add cordova-plugin-camera Fetching plugin "cordova-plugin-camera@~2.1.0" via npm Installing "cordova-plugin-camera" for android Installing "cordova-plugin-camera" for ios  Plugins can also be added using a directory or a git repo. NOTE: The CLI adds plugin code as appropriate for each platform. If you want to develop with lower-level shell tools or platform SDKs as discussed in the Overview, you need to run the Plugman utility to add plugins separately for each platform. (For more information, see Using Plugman to Manage Plugins.) Use plugin ls (or plugin list, or plugin by itself) to view currently installed plugins. Each displays by its identifier: $ cordova plugin ls
cordova-plugin-camera 2.1.0 "Camera"
cordova-plugin-whitelist 1.2.1 "Whitelist"


### Using merges to Customize Each Platform

While Cordova allows you to easily deploy an app for many different platforms, sometimes you need to add customizations. In that case, you don't want to modify the source files in various www directories within the top-level platforms directory, because they're regularly replaced with the top-level www directory's cross-platform source.

Instead, the top-level merges directory offers a place to specify assets to deploy on specific platforms. Each platform-specific subdirectory within merges mirrors the directory structure of the www source tree, allowing you to override or add files as needed. For example, here is how you might uses merges to boost the default font size for Android devices:

• Edit the www/index.html file, adding a link to an additional CSS file, overrides.css in this case:

<link rel="stylesheet" type="text/css" href="css/overrides.css" />

• Optionally create an empty www/css/overrides.css file, which would apply for all non-Android builds, preventing a missing-file error.

• Create a css subdirectory within merges/android, then add a corresponding overrides.css file. Specify CSS that overrides the 12-point default font size specified within www/css/index.css, for example:

body { font-size:14px; }


When you rebuild the project, the Android version features the custom font size, while others remain unchanged.

You can also use merges to add files not present in the original www directory. For example, an app can incorporate a back button graphic into the iOS interface, stored in merges/ios/img/back_button.png, while the Android version can instead capture backbutton events from the corresponding hardware button.

### Updating Cordova and Your Project

After installing the cordova utility, you can always update it to the latest version by running the following command:

$sudo npm update -g cordova  Use this syntax to install a specific version: $ sudo npm install -g cordova@3.1.0-0.2.0


Run cordova -v to see which version is currently running. To find the latest released cordova version, you can run:

$npm info cordova version  To update platform that you're targeting: $ cordova platform update android --save
\$ cordova platform update ios --save
...etc.

2017-01-31 03:40:25