I opened this library in Android Studio: https://android.googlesource.com/platform/development/+/master/samples/ToyVpn?autodive=0
However, I'm not able to run the app itself. I have tried multiple things (too many to list here) to get it to work but to no avail. For example, I've taken a look at this question but it's not helpful for this specific project.
Can someone tell me step by step what to do to run this project's app successfully?