Android系统在开机后会自动在各个存储根目录创建一堆文件夹。
像：Alarms Audiobooks Documents Movies Notifications Podcasts Ringtones Android DCIM Download Music Pictures Recordings
解决方法：
packages/providers/MediaProvider/src/com/android/providers/media/MediaProvider.java
/**
* Ensure that default folders are created on mounted primary storage
* devices. We only do this once per volume so we don't annoy the user if
* deleted manually.
*/
private void ensureDefaultFolders(@NonNull MediaVolume volume, @NonNull SQLiteDatabase db
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