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android-emulator-runner/README.md
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2019-11-23 20:57:10 +11:00

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# GitHub Action - Android Emulator Runner
<p align="left">
<a href="https://github.com/ReactiveCircus/android-emulator-runner"><img alt="GitHub Actions status" src="https://github.com/ReactiveCircus/android-emulator-runner/workflows/Main%20workflow/badge.svg"></a>
</p>
A GitHub Action for installing, configuring and running Android Emulators on macOS virtual machines.
The old ARM-based emulators were slow and are no longer supported by Google. The modern Intel Atom (x86 and x86_64) emulators require hardware acceleration (HAXM on Mac & Windows, QEMU on Linux) from the host to run fast. This presents a challenge on CI as to be able to run hardware accelerated emulators within a docker container, **KVM** must be supported by the host VM which isn't the case for cloud-based CI providers due to infrastructural limits.
The **masOS** VM provided by **GitHub Actions** has **HAXM** installed so we are able to create a new AVD instance, launch an emulator with hardware acceleration, and run our Android
tests directly on the VM.
This action automates the process by doing the following:
- Install / update the required **Android SDK** components including `build-tools`, `platform-tools`, `platform` (for the required API level), `emulator` and `system-images` (for the required API level).
- Create a new instance of **AVD** with the provided [configurations](#configurations).
- Launch a new Emulator with the provided [configurations](#configurations).
- Wait until the Emulator is booted and ready for use.
- Run a custom script provided by user once the Emulator is up and running - e.g. `./gradlew connectedCheck`.
- Kill the Emulator and finish the action.
## Usage
Note that this action must be run on a **macOS** VM, e.g. `macOS-latest` or `macOS-10.14`.
A workflow that uses **android-emulator-runner** to run your instrumented tests on **API 29**:
```
jobs:
test:
runs-on: macOS-latest
steps:
- name: checkout
uses: actions/checkout@v1
with:
fetch-depth: 1
- name: run tests
uses: reactivecircus/android-emulator-runner@v1
with:
api-level: 29
script: ./gradlew connectedCheck
```
We can also leverage GitHub Actions's build matrix to test across multiple configurations:
```
jobs:
test:
runs-on: macOS-latest
strategy:
matrix:
api-level: [21, 23, 29]
target: [default, google_apis]
steps:
- name: checkout
uses: actions/checkout@v1
with:
fetch-depth: 1
- name: run tests
uses: reactivecircus/android-emulator-runner@v1
with:
api-level: ${{ matrix.api-level }}
target: ${{ matrix.target }}
arch: x86_64
profile: Nexus 6
script: ./gradlew connectedCheck
```
## Configurations
| | **Required** | **Default** | **Description** |
|----------------------|--------------|-------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `api-level` | Required | N/A | API level of the platform system image - e.g. 23 for Android Marshmallow, 29 for Android 10. **Minimum API level supported is 21**. |
| `target` | Optional | `default` | Target of the system image - `default` or `google_apis`. |
| `arch` | Optional | `x86` | CPU architecture of the system image - `x86` or `x86_64`. |
| `profile` | Optional | N/A | Hardware profile used for creating the AVD - e.g. `Nexus 6`. For a list of all profiles available, run `$ANDROID_HOME/tools/bin/avdmanager list` and refer to the results under "Available Android Virtual Devices". |
| `headless` | Optional | `true` | Whether to launch emulator without UI - `true` or `false`. When set to `true` this is equivalent to running the emulator with `emulator -no-window`. |
| `disable-animations` | Optional | `true` | Whether to disable animations - `true` or `false`. |
| `script` | Required | N/A | Custom script to run - e.g. to run Android instrumented tests on the emulator: `./gradlew connectedCheck` |