flutter plugin not installed even after installing code example

Example 1: Flutter plugin not installed; this adds Flutter specific functionality. windows

For windows 

// run on commandline
flutter config --android-studio-dir=C:\Program Files\Android\Android Studio

Example 2: flutter plugin installed but in flutter doctor it shows not installed

flutter channel dev
flutter upgrade
flutter config --android-studio-dir="C:\Program Files\Android\Android Studio"
flutter doctor -v