How to fixed Android studio logcat Debug console nothing to show.?

You need to press Alt+6 twice to restart the logcat window. That way it'll show the log outputs.

I had the same problem but I solved by the following steps, Try this once.

1) In the android studio.

2) select   Run --Edit Configuration 

Android Studio

3) You can see the right corner tab  Miscellaneous Tab Check  Show Logcat automayically.

Logcat

4) select -- Show only Selected application.

Error show