How to Hide any files in android mobile without any apps

Hellow guys.In this tutorial i am goin to tell you how can you Hide any files in android mobile without any apps.So follow this steps:-
1)Go to my files(File manger of your phone)
2)Choose The file you want hide
3)Rename the file with a '.'(Example:-if your file name is 'music' then rename it '.music'
4)Click Ok
5)Done...

Now How to unhide the file again
Follow these steps:-
1)Go to file manager setting
2)Check 'Show Hidden Files"
3)Done....