I was looking for, a solution for editing Exif data when lost after using some photo editors. Since I always save the original file (I treat original's like negatives, I may want to edit later for a different effect, or use better software in the future), with this APP, I can copy EXIF data from the original photo into the edited photo. ==========For Batch renaming photos to the EXIF DATE TAKEN, I suggest PHORGANIZER for Android and NAMESIF for PC. Using this combination solves the problem of shooting scenes with multiple camera APPs/Physical cameras, and then the naming conventions of each throwing your photos out of chronological order when placed into one sub-directory regardless of the File Browser/Gallery APP/Software used. Rename the files BEFORE editing!
EXIF Tag Editor (Photo) at Google Play market analyse