2. Long press on the folder which you want to hide ans select "Rename".
3. Enter any name which you want to assign but precede with "." letter (Suppose you want to create a folder with name "data", then simply type ".data")
4. Make sure you have disabled the option "Show Hidden Files" from file manager settings. This will hide you all folders preceding with "." letter.
5. To get your files back, simply enable option "Show Hidden Files".
Voila, That's all, Now you have hidden your file or folder in your android mobile.