dev-util/android-tools-9.0.0_p3-r1 provides an adb version 40. The latest android studio (4.0.0+) uses adb client that is version 41, so it fails due to version mismatch Reproducible: Always Steps to Reproduce: 1. Install android-studio 4.0.0.16.193.6514223 2. Attempt to use adb within Android Studio (e.g. adb start-server) 3. Should get error: adb server version (41) doesn't match this client (40); killing... Actual Results: See Steps to Reproduce for details. Expected Results: adb should not fail and no mismatch error. android-tools needs to be upgraded? to provide an adb that is version 41. Android studio v4 ebuild is awaiting version bump, see: https://bugs.gentoo.org/727430. In that bug, I've added a sample ebuild that can install Android studio v4.
This is not a bug, it's the intended behavior. Close this, what you want is a bump request like Bug #707568 (or whatever the equivalent android 10 version is these days).