[Tutorial] How to hide any file in android my no using app

How to hide any folder or files in android without any third party app?Need: things are;; 1;First of all switch on your phone and unlock it (just kidding).Now open your  file manager. For this tutorial, I'm using the default file manager of my Galaxy star 2;Next go to your file manager's  3;open youR file{sdcard/extsdcard{or choose thee file you want to hide{i choose sdcard file/ucdownlode/see ss} 4;edit the file name that make you hide and add{.}dot right before all the characters. And save it{i hide ucdownlode file see in ss} 5 then go to filemanager sitting 6; then unselect {show hidden files/show file extention} 7;then magice will be happen you see that you doter renamed file gets hide 8 if any budy have problum see in shortscreen