How to Delete Commented code througout the project in Android Studio

Step 1 : Press CTRL+SHIFT+R The below window will open

Step 2 : Inside Text in find put this.
(/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*+/)|(//.*)

Note : The Above Regular Expression Deletes 
Single Line  Comments  "//commented code"
Block Code Comments  "/*commented code*/"
XML code   Comments  "<!-------Your comment----->"

Step 3 : Inside Replace with leave blank.

Step 4 : Check Regular Expression with Right mark and in context select in Comments

Step 5 : Inside Scope Select

Whole Project - To Remove Comments In Whole Project
Module - To remove only in Particular Module
Directory - To remove In Particular Directory

Step 6 :  Click Find.

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Thank You

Happy Coding...:-)