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I am using Kitkat 4.4.2 on my android device.

When I mount USB drive to my device then all the images,videos in USB drive are shown in the Gallery. After unmounting USB drive, images,videos are still there as a thumbnails.

Can't I refresh my gallery without rebooting?

6

The system itself AFAIK doesn't expose a GUI element to do so. However, you have multiple options to trigger the Media Scanner:

  • Reboot the device (not that convenient)
  • unmounting/remounting the SD card (via Settings; better, but still not convenient)
  • using one of the apps/widgets available in the app stores. One that's reportedly working with Kitkat is SD Scanner (see my answer here)
  • using ADB to trigger it (telling it the card has just been mounted – so basically we fake the second option):

    adb shell "am broadcast -a android.intent.action.MEDIA_MOUNTED -d file:///mnt/sdcard"
    
  • Edit: Some ROMs (e.g. CyanogenMod) seem to have a GUI element for it in Settings › Developer options › Developer tools › Media provider – where you can find a button labeled "SCAN SD CARD"

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  • Thanks! I also needed to am force-stop com.android.gallery3d – caiohamamura Jan 9 '17 at 15:30
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Setting - app - gallery force stop and clear cache. Gallery will reload all those media.

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  • Last time I did this, it worked though some of the thumbnails couldn't be loaded anymore. – Andrew T. Nov 22 '14 at 4:18
  • This had no effect for me. – Cerin Jun 25 '17 at 2:25

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