我的Unity Editor版本是2020.3.37f1c1
解决方式： 下载JDK
1. 去Editor的安装目录，找modules.json
2. 之后搜“JDK”，找JDK的下载地址
http://download.unitychina.cn/download_unity/open-jdk/open-jdk-win-x64/jdk8u172-b11_4be8440cc514099cfe1b50cbc74128f6955cd90fd5afe15ea7be60f832de67b4.zip
3. 将下载的JDK放到默认目录
Unity>Edit>Preferences>External Tools
D:Program FilesUnity 2020.3.37f1c1EditorDataPlaybackEnginesAndroidPlayerOpenJDK
如果没有对应文件夹就自己创建
下载SDK1. sdk-tools-windows-4333796.zip 对应放到 SDK/tools 目录下
SDK国内能下载的地址(浏览器输入此地址)：
https://dl.google.com/android/repository/sdk-tools-windows-4333796.zip
D:Program FilesUnity 2020.3.37f1c1EditorDataPlaybackEnginesAndroidPlayerSDKtools
2. platform-tools_r28.0.1-windows.zip 对应放到 SDK/platform-tools 目录下
https://dl.google.com/android/repository/platform-tools_r28.0.1-windows.zip
3. platform-29_r05.zip 对应放到 SDK/platform目录下
https://dl.google.com/android/repository/platform-29_r05.zip
下载NDK
NDK国内能下载的地址：
https://dl.google.com/android/repository/android-ndk-r19-windows-x86_64.zip
