There is very awkward thing I am facing logcat is shown in debugging application but while running(not debugging) application it is not showing logcat .
I tried rest
I found the following worked for me.
First, my problem: i was testing an app on a Samsung Galaxy A3 attached via usb cable. I was getting the usual logCat messages, including the filtered ones then all of a sudden the logCat stopped displaying filtered messages. Setting it to Verbose displayed a continues stream of messages with a mesage at the top left corner of the lagCat stating "too much output to display".
I tried restarting Android Studio (with and without clearing the cache) but no luck. I then rebooted my phone and everything was back to normal. So it appeared that the attached phone was the problem, sending too much info to the logCat.
Hope this helps someone.