Android Studio freezes on "Initializing ADB..."

Reconnect and restart adb-server does not help.

My fault is deleted the localhost config in /etc/hosts.

127.0.0.1 localhost

after adding this line to /etc/hosts, everything works fine.

Note that maybe you have installed some hosts auto config software. Just make sure ping localhost in the terminal and see 127.0.0.1 on screen.

Disconnect the device that is connect. And then the Initializing would stop. And then you can reconnect the device. Works for me every single time