if saved in external card, just mount on PC and use and free data recovery software.

if saved in external memory, can try this: https://play.google.com/store/apps/details?...t.apps.undelete

if it can recover, you have to buy the key to recover.

next time use dropbox/google plus/copy auto upload features. now you wouldn't know when you will become the statistic. even pak guard rob people now.

The link he posted says:

"Undelete for Android is an application for root users that allows you to recover any deleted files from your SD card or internal storage." 

but it seems you need root your device for that apps to restore files in internal memory.