Setting up your development environment

• Build Unreal Engine 4.20 with the GoogleARCore plugin from source code by following these steps:

  • Gain access to Epic's GitHub repository.

  • Clone the google-ar-unreal repo with the following command:

    Alternatively, developers with an existing Unreal Engine 4.20 repo can merge the 4.21-arcore branch to their own branch with the following commands:

    Caution: Unreal Engine 4.20 includes an older version of the ARCore plugin. To use ARCore 1.7 , you must get the latest ARCore plugin from Google's fork of Unreal Engine.

  • Build Unreal Engine from source.

    • Make sure to choose your operating system in the first step.
    • Prevent setup from overwriting the included Google ARCore binary files with the older files provided by Epic. Select n when you see Would you like to overwrite your changes (y/n)?.

• Set up the Unreal editor for Android development by following the Android Quick Start. Make sure you install Android SDK Platform version 7.0 (API level 24) or higher.

  Note: Unreal Engine 4 (UE4) uses a special version of the Android Software Development Kit (SDK), called CodeWorks for Android. You must install CodeWorks, as described in Unreal's quickstart, even if you have already installed the Android SDK and NDK through Android Studio.

• You will need to get the Unreal HelloAR sample project. You can either:

  • Download the sample project repository and extract it.

    -or-

  • Clone the repository with the following command:

• You will need a supported Android device.

Prepare your device

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To prepare your supported device, enable developer options and USB debugging.

Open the sample project

In Unreal Editor open the HelloAR sample project.

Set up Android development settings

1. In the menu bar, click Edit > Project Settings.

2. In Project Settings, under the Android SDK platform, make sure all the paths are set correctly to your Android SDK and Android NDK installations. Set the SDK API Level to 'matchndk'. Then set the NDK API Level to android-24 or higher.

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Build and run the sample app

1. Package the HelloAR project. In the menu bar, select File > Package Project > Android > Android (ASTC).

   A dialog box will appear. In that box, create a new folder called Builds and click Select.

2. Unreal begins packaging the project and displays the progress in the status window (lower right-hand corner). For details on the packaging process, see the Output Log window.

3. Once the project has been packaged, make sure your device is connected to your machine. Open the Builds folder and double-click the file Install_HelloARUnreal_Development-armv7-es2.bat (if you are using Windows) or Install_HelloARUnreal_Development-armv7-es2.command (if you are using Mac) file to install the project on your Android Smartphone.

4. After the install is completed, look for an app called HelloAR UE4 on your device and launch it.

Unreal Engine Android App

As you move your device, the app automatically detects flat surfaces and draws a diamond grid. Tap the grid to place an Android robot on the surface.

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Next Steps

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• Learn how to Enable ARCore in your app.
• Use Augmented Images to build apps thatcan respond to 2D images, such as posters or logos, in the user's environment.
• Target your apps to iOS or Android and use Cloud Anchorsto create AR experiences that Android and iOS users can share. See theQuickstart for Cloud Anchors in Unrealto get started.
• Learn more about Unreal Hand Held AR platform development
• Review Runtime considerations.
• Review Design guidelines.