reactivecircus/android-emulator-runner
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Add information on running on Linux to README.md.

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<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 hardware-accelerated Android Emulators on macOS virtual machines (or Linux virtual machines but without hardware accleration).
A GitHub Action for installing, configuring and running hardware-accelerated 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. If you want to learn more about this, here's an article I wrote: [Running Android Instrumented Tests on CI](https://dev.to/ychescale9/running-android-emulators-on-ci-from-bitrise-io-to-github-actions-3j76).
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It is recommended to run this action on a **macOS** VM, e.g. `macos-latest` or `macos-10.15` to take advantage of hardware accleration support provided by **HAXM**.
Please note that while Linux VMs (e.g. `ubuntu-latest` or `ubuntu-18.04`) are also supported, hardware acceleration will **not** be available.
A workflow that uses **android-emulator-runner** to run your instrumented tests on **API 29**:
```
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Default `emulator-options`: `-no-window -gpu swiftshader_indirect -no-snapshot -noaudio -no-boot-anim`.
_Please note that if you are running on a Linux VM, `-no-accel` will be added to the `emulator-options` to make sure hardware acceleration is turned off._
## Can I use this action on Linux VMs?
The short answer is yes but it's expected to be a much worse experience (on some newer API levels it might not work at all) than running it on macOS.
For a longer answer please refer to [this issue](https://github.com/ReactiveCircus/android-emulator-runner/issues/46).
## Who is using Android Emulator Runner?