Can’t attach Android Studio’s debugger to Android process

So finally I got it working, by:

Checking 'Show all processes' checkbox!

BUT as you see in the question, checkbox was on at the beginning, so there were multiple issues.

To summarize, these are other actions to be done:

• Kill all adb processes (use ps -x | grep adb and kill -9 [process id])
• adb start-server in terminal
• Reconnect device
• adb devices (to make sure device is connected successfully)
• Make sure Android DDMS Devices | logcat shows your app and only one device is listed.
• Check Show all processes checkbox. See screenshot