The dependency

  implementation 'com.hzy:libp7zip:1.7.0'

is now

implementation 'com.github.hzy3774:AndroidP7zip:v1.7.2'

Accordingly the correct import for accessing the P7ZipApi class would be:

import com.hzy.libp7zip.P7ZipApi;

Refer to the author's library:

https://jitpack.io/p/hzy3774/AndroidUn7zip

https://github.com/hzy3774/AndroidUn7zip