As you suspect, the gallery depends on the mediascanner to update the list of files.
The samsung MyFiles app will rescan/refresh the contents of a directory
every time you re-open the app.
To "force" a mediascanner update on a directory, you might want to use scanFile.
http://developer.android.com/reference/android/media/MediaScannerConnection.html
public static void scanFile (Context context, String[] paths, String[] mimeTypes,
MediaScannerConnection.OnScanCompletedListener callback)
Alternately u can use a broadcast intent for the same purpose:
http://developer.android.com/reference/android/content/Intent.html#ACTION_MEDIA_SCANNER_SCAN_FILE
Also note that by default, "internal" data of any app is considered private,
and mediascanner won't scan the app's private directory for media files:
http://developer.android.com/guide/topics/data/data-storage.html#filesInternal
regards
CVS
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