在新增api后，进行系统编译前，需要先在系统中使用make命令，对current.txt进行自动更新。
(1) android 低版本，新增api直接编译，会出现入下异常：
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You have tried to change the API from what has been previously approved.
To make these errors go away, you have two choices:
1) You can add "@hide" javadoc comments to the methods, etc. listed in the
errors above.
2) You can update current.txt by executing the following command:
make update-api
To submit the revised current.txt to the main Android repository,
you will need approval.
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需要配置编译环境后，执行 make update-ap 系统自动更新current文档，再进行编译。
(2) anndroid 高版本，新增api直接编译，会出现如下异常：
******************************
You have tried to change the API from what has been previously approved.
To make these errors go away, you have two choices:
1. You can add '@hide' javadoc comments to the methods, etc. listed in the
errors above.
2. You can update current.txt by executing the following command:
make api-stubs-docs-update-current-api
To submit the revised current.txt to the main Android repository,
you will need approval.
******************************
需要配置编译环境后，执行 make api-stubs-docs-update-current-api 系统自动更新current文档，再进行编译。
最后，保存或上传current.txt文件更新即可。
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原文链接：https://blog.csdn.net/xuann/article/details/119949127