Подскажите пожалуйста, как программно отследить изменение файлов в галерее android. Хочу сделать по таймеру сканирование файлов и сверять их с БД, но возможно в android 4.4+ есть некий механизм, который срабатывает при изменении файловой системы в галерее.
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