question: private byte [ ] addExif ( byte [ ] jpeg ) { ExifInterface exif = new ExifInterface ( ) ; exif . addDateTimeStampTag ( ExifInterface . TAG_DATE_TIME , System . currentTimeMillis ( ) , TimeZone . getDefault ( ) ) ; ByteArrayOutputStream jpegOut = new ByteArrayOutputStream ( ) ; try { exif . writeExif ( jpeg , jpegOut ) ; } catch ( IOException e ) { Log . e ( TAG , "Could not write EXIF" , e ) ; } return jpegOut . toByteArray ( ) ; }
target:  Adds basic EXIF data to the tiny planet image so it an be rewritten later.