Nuxt module to transform your PWA into an Android app, using Trusted Web Activities (TWA)

Trusted Web Activities (TWA) allow you to package a Progressive Web App (PWA) in an Android App. You can upload this app to the Google Play Store. This module sets the necessery configuration for running the app, creates icons and generates files used by the application.

Trusted Web Activities only work when you are using a legitimate service worker, so we highly recommend using the PWA module or setting up a PWA yourself.

To upload an app to the Google Play Store you need a key for signing. To create one follow these instructions

Important notice

Store the key in a safe place, if you uploaded your app with a key you will need the same key for each update.

After you've created this key you will need to copy the SHA-256 for the nuxt configuration file by running this command:

keytool -list -v -keystore LOCATION_OF_YOUR_KEY.keystore

You will need Android Studio to create the signed app.

npm install nuxt-twa-module --save-dev

Add nuxt-twa-module to modules section of nuxt.config.js.

  {
    modules: [
      ['nuxt-twa-module', {
        /* module options */
        defaultUrl: 'https://your-url.com',
        hostName: 'your-url.com',
        sha256Fingerprints: ['/* your SHA-256 keys */'],
        applicationId: 'com.example.example',
        launcherName: 'Your app name',
        versionCode: 1,
        versionName: '1.0',
        statusBarColor: /* color */,

        /* optional */
        /* overwrite default location for icon */
        iconPath: '/static/icon.png'
        /* Overwrite folder where to put .wellknown */
        distFolder: '.nuxt/dist/client',
      }],
    ]
  }

the sha256Fingerprints by is an array with one SHA-256 key string. But if you have multiple you can add them to the array. More information about the website asociation: https://developer.android.com/training/app-links/verify-site-associations#web-assoc

When the configuration is done you can run your project like you are used to.

npm run build

or

npm run generate

• An android folder in your project root, which you can open in Android Studio to build your app. When you've build and tested your app you can use Generate Signed Bundle/APK. This will generate a .aab file that can be uploaded to the Google Play Store.
• Your Nuxt app with an added .well-known folder which is needed to make your domain trusted with the app in the store.

To be able to test the Android application, you need to tell Chrome on your device it can trust your PWA. For this you need to have android-platform-tools installed on your machine.

brew cask install android-platform-tools

In Chrome on your device, go to chrome://flags and enable Enable command line on non-rooted devices

On your machine, run the following command to whitelist your URL in Chrome:

adb shell "echo '_ --disable-digital-asset-link-verification-for-url=\"<your URL>\"' > /data/local/tmp/chrome-command-line"

• Trusted Web Activities
• SVGOMG example used as template in this module.
• Drinks app in the Google Play Store

MIT