Android 环境设置

To create a Unity application for Android, you first need to set up your Unity project to support Android. To support Android, a Unity project requires the following dependencies:

• The Android Build Support module.
• The Android Software Development Kit (SDK).
• The Native Development Kit (NDK).
• A Java Development Kit. By default, Unity uses OpenJDK.

Before you get started, check Unity’s Requirements and compatibility documentation for Android to make sure you’re aware of any limitations for developing a Unity application for Android.

Installing dependencies

Unity distributes dependencies as modules which means you must use the Unity Hub to install them. You can install them either when you install a new Unity Editor version, or add them to an existing Unity Editor install. To install modules:

• At install time, refer to Downloading and installing Editors and modules with the Unity Hub.
• To an existing install, refer to Add modules.

The three modules to install are:

• Android Build Support
• Android SDK & NDK Tools
• OpenJDK

Unity installs Android SDK & NDK Tools and OpenJDK respectively in the SDK, NDK, and OpenJDK folders under /[EditorVersion]/Editor/Data/PlaybackEngines/AndroidPlayer/.

Customizing dependencies

You should use the Unity Hub to install Android SDK & NDK tools and OpenJDK to ensure that you receive the correct versions and configurations. However, there are situations where it’s useful to change the SDK, NDK, or JDK that Unity uses to build applications for Android. For example, if you have multiple versions of Unity with the same dependencies and you don’t want to duplicate the installation of the SDK, NDK, and JDK, you can specify a shared location.

To make Unity use a custom version of a dependency:

1. Download the custom version of the dependency.
   Warning: Unity only officially supports versions of the OpenJDK, SDK, or NDK that it supplies through the Hub. For more information, refer to Supported dependency versions.
2. In Unity’s main menu, go to Edit > Preferences > External Tools > Android (macOS: Unity > Settings > External Tools > Android)
3. Refer to the External tools for Android documentation to understand how to customize the installation of JDK, SDK, NDK, and Gradle.

Supported dependency versions

This section contains information on which versions of each dependency each Unity version supports. Each version of Unity requires a specific version of the Android NDK and Android JDK, but there are no exact version requirements for the Android SDK.

SDK

Unity relies on tools that the Android SDK provides and different versions of the SDK usually have the same tools available. This means you can use any recent version of the SDK as they all contain the build tools that Unity requires.

The following table shows the supported versions of Android SDK tools installed with each Unity version:

Unity 版本	SDK tools version	SDK Build tools version	SDK Command-line tools version	SDK Platform tools version
2023.2	26.1.1	32.0.0	6	33.0.1
2022.3 LTS	26.1.1	32.0.0	6	32.0.0
2021.3 LTS	26.1.1	30.0.2	2	30.0.4
2020.3 LTS	26.1.1	30.0.2	2	28.0.1

Important: Unity versions 2020.3 and 2021.3 LTS do not support Android SDK Build tools versions 31 and above.

NDK

The following table shows the NDK version that each Unity version supports:

Unity 版本	NDK 版本
2023.2	r23b(23.1.7779620)
2022.3 LTS	r23b(23.1.7779620)
2021.3 LTS	r21d(21.3.6528147)
2020.3 LTS	r19(19.0.5232133)

JDK

The following table shows the JDK version that each Unity version supports:

Unity 版本	JDK version
2023.2	11 (OpenJDK version 11)
2022.3 LTS	11 (OpenJDK version 11)
2021.3 LTS	8 (OpenJDK version 1.8)
2020.3 LTS	8 (OpenJDK version 1.8)

Note: Only Unity version 2023.2 supports CMake version 3.22.1. Unity versions 2022.3 and below do not support CMake.

External Tools for Android

The External Tools section for Android allows you to configure settings for Android development tools used to set up Unity projects on Android devices. To access the External Tools for Android section, in the Preferences window (macOS: Unity > Settings >), go to Edit > Preferences > External Tools > Android.

For general Preferences settings, refer to Preferences.

设置	描述
JDK installed with Unity(recommended)	Indicates whether to use the recommended version of Java Development Kit (JDK) installed with Unity or the custom JDK installation. If enabled, the setting displays the path to the JDK installation folder. To use the custom JDK version, disable this option and click Browse to set the custom JDK installation folder path.
Android SDK tools installed with Unity(recommended)	Indicates whether to use the recommended versions of Android SDK tools installed with Unity or the custom SDK tools installation. If enabled, the setting displays the path to the SDK tools installation folder. To use the custom SDK tools version, disable this option and click Browse to set the custom SDK tools installation folder path.
Android NDK installed with Unity(recommended)	Indicates whether to use the recommended version of Android Native Development Kit (NDK) installed with Unity or the custom NDK installation. If enabled, the setting displays the path to the NDK installation folder. To use the custom NDK version, disable this option and click Browse to set the custom NDK installation folder path.
Gradle installed with Unity(recommended)	Indicates whether to use the recommended version of Android Gradle installed with Unity or the custom Gradle installation. If enabled, the setting displays the path to the Gradle installation folder. To use the custom Gradle version, disable this option and click Browse to set the custom Gradle installation folder path.
Stop Gradle daemons on exit	Indicates whether to stop Gradle daemons when the Unity Editor exits. This option is enabled by default and it might help to free up resources on your computer.
Kill ADB server on exit	Indicates whether to terminate Android Debug Bridge (adb) server when the Unity Editor exits. This option is enabled by default and it might help to free up resources on your computer.
Maximum JVM heap size, Mbyte	Specifies the maximum Java heap size that can be allocated during the Android build process. The value is specified in megabytes and the default value is 4096. You can increase or decrease this value based on your project requirement. Increase this value if you experience heap space errors.
Keystores Dedicated Location	Specifies the folder path to your Android keystores. Unity uses this path when signing your Android application during the build process. To set a new path for your application, click Browse and navigate to the folder where you want to store your Android keystores. For more information, refer to Choose the keystore location.

Setting the Android SDK Target API

The Unity Hub installs the latest version of the Android SDK Target API that Google Play requires. If you need to use a more recent version, you can change it in the Android Player Settings. To do this:

1. Select Edit > Project Settings.
2. In the Project settings window, select the Player tab, then open Android Player Settings:
   
3. In the Other Settings section, change the Target API Level.
   

If you select a target API version newer than the latest installed version, the Unity Android SDK Updater can automatically download and install the new version. Unity displays a prompt and you can choose to either:

• Automatically download and install the new version of the Android SDK.
• Continue to use the highest installed version of the Android SDK.

If you select a target API version that isn’t installed and is older than the latest installed version, the Unity Android SDK Updater can’t perform the update and Unity displays an error message. In this case, to update the Android SDK Target API, you must use the Android sdkmanager from either Android Studio or the command-line tool. Regardless of the method you choose, make sure to select the correct Android SDK folder for Unity in the Edit > Preferences > External Tools window. For more information, refer to Customizing dependencies.

Important: On Windows, if you installed the Unity Editor in the default folder (/Program Files/), you must run the sdkmanager with elevated privileges (Run as Administrator) to perform the update.

ChromeOS

In Unity, ChromeOS is part of the Android development environment. This means you can deliver new and existing Android applications to ChromeOS. Also, since many ChromeOS devices are laptops or have a laptop mode, you can use features such as mouse and keyboard input. For more information:

• On ChromeOS in Unity: ChromeOS.
• On how to build an Android application for ChromeOS: Building your ChromeOS application.