This was discussed in SO question 7104624, apksigner doc on developer.android.com, and other places. They all say to use the option "--print-certs" on the apksigner verify command line. But I always get the error message unsupported option: --print-certs.
I have tried apksigner.bat for versions 26.0.2, 27.0.2 and 26.0.3 all with the same result.
I'm probably doing something dumb but I can't figure out what that is. Does anybody have a similar experience?
I used apksigner verify myapp.apk --print-certs.
I just tried apksigner verify --print-certs myapp.apk and it worked. I guess the options must come before the APK. My Bad. I knew it was something dumb I did.