How to Manually Run Media Scanner on Android
If you have added some media files, movies or songs, your music app or gallery wont show the newly added files until something called Media scanning has done. Some firmware’s will begin media scanning right after you copy media files to your SD card, but some wont. So, When your reboot your phone, media scanner will automatically run on the start-up and new files will be cached by the applications and it will be listed.
