HangTime / Trusted Web Activity

This project uses the Trusted Web Activities technology to wrap HangTime in an Android Application.

Requirements

Node.js 10.0 or above

Setting up the Environment

Get the Java Development Kit (JDK) 8.

The Android Command line tools requires the correct version of the JDK to run. To prevent version conflicts with a JDK version that is already installed, Bubblewrap uses a JDK that can unzipped in a separate folder.

Download a version of JDK 8 that is compatible with your OS from AdoptOpenJDK and extract it in its own folder.

Warning: Using a version lower than 8 will make it impossible to compile the project and higher versions are incompatible with the Android command line tools.

Get the Android command line tools

Download a version of Android command line tools that is compatible with your OS from https://developer.android.com/studio#command-tools. Create a folder and extract the downloaded file into it.

Updating the location of the JDK and / or the Android command line tools.

If the location for the JDK or the Android command line tools have been setup with the wrong path or if their location has changed after the initial configuration, the location for either of those can be changed by editing the configuration file at ${USER_HOME}/.llama-pack/llama-pack-config.json.

Settings used: OpenJDK 14 (Latest) / Hotspot: jdk-14+36 - AdoptOpenJDK macOS

llama-pack-config:

{
  "jdkPath": "/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk",
  "androidSdkPath": "/Users/stevie-ray/Library/Android/sdk"
}

Using Bubblewrap

Installing Bubblewrap

npm i -g @bubblewrap/cli

Initializing an Android Project

Generate an Android project from an existing Web Manifest:

bubblewrap init --manifest https://hangtime.stevie-ray.nl/manifest.json

When initalizing a project, Bubblewrap will download the Web Manifest and ask you to confirm the values that should be used when building the Android project.

It will also ask you for the details needed to generate a signing key, used to sign the app before uploading to the Play Store.

Building the Android Project

bubblewrap build

OpenJDK 14 / Gradle support issue:

in gradle/wrapper/gradle-wrapper.properties set: distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip to support adoptopenjdk-14

When building the project for the first time, the Android Build Tools will need to be installed. The tool will invoke the installation process for the build tools. Make sure to read and accept the license agreement before proceeding.

As a result of the build step, the tool will generate a signed APK (app-release-signed.apk) that can be uploaded to the Play Store. You will also need to deploy a Digital Asset Links file to validate your domain. The TWA Quick Start Guide explains how to extract the information needed to generate it.

Stevie-Ray / hangtime-android