Inject Log Tag Plugin is a plugin for Android Studio.
When you want to output log by logcat, you write like this.
Log.d(LOG_TAG, "somthing");
Usually I declare LOG_TAG variable below the class declaration, and use it is Log class.
Download plugin from JetBrains repository.
Preferences > Plugins > Install JetBrains Plugins... > Inject LOG_TAG Plugin
Code > Generate...
Select Inject LOG-TAG
LOG_TAG field will be appeared.