for (int i = 0; i < GallerySelection.length; i++)
{
    if (GallerySelection[i])
        deleteFile(GalleryImagePaths[i]);
}

MediaStoreScanner.scanFile(scanHandler, getApplicationContext(), MyApplication.getApplicationRootDirectory(), null);
// MyApplication.getApplicationRootDirectory() returns "/mnt/sdcard/Pictures/MyApplication/"