I have a issue that built-in video in the Gallery can't be shown up at first boot after refreshing image. I have tried some keywords like "android gallery cache", "how to force a media rescan", "android media scanner". I have not got good answer until finding this infomation.

Reference:
How to Disable Media Scanning at Boot in Android Phone: Rescan Media Root
MediaScanner
ANDROID Media Scanning (How-To Enable & Disable)
How to trigger a media scan?
Android学习——MediaScanner源码分析
【译】Android 多媒体扫描过程（Android Media Scanner Process）
android系统action 总结【转载】
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