- 项目结构（File->Project Structure）
既然是灰色，说明有问题。
- 设置（File->Setting）
- 修改设置
打开local.properties，添加刚刚下载的ndk：
## This file must *NOT* be checked into Version Control Systems,
# as it contains information specific to your local configuration.
#
# Location of the SDK. This is only used by Gradle.
# For customization when using a Version Control System, please read the
# header note.
#Tue May 31 21:35:41 CST 2022
sdk.dir=D\:\\SOFTWARES\\DEVELOP\\adt-bundle-windows-x86_64-20190307\\sdk
ndk.dir=D\:\\SOFTWARES\\DEVELOP\\adt-bundle-windows-x86_64-20190307\\sdk\\ndk\\21.0.6113669
