How can I delete all images in the album on my Sony Xperia S? I synched all my photos with Lightroom, now would like to delete them from my Phone. There is no delete function in the Sony Album (Android Album?) however. How can I get rid of all photos taken?
Deleting based on File Extension:

You may install Terminal Emulator from Play Store. Open it and enter the commands.

find $EXTERNAL_STORAGE $SECONDARY_STORAGE -iname "*.jpg" -exec rm {} \;


You may replace *jpg with *png , *jpeg , or other extensions involving picture formats.