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Android会自动扫描外存（SD卡）中的文件，获取到audio类型的文件，分析文件后，将信息数据存储在 MediaStore.Audio.AudioColumns表内，该表的结构如下：
字段包括如下：
| Constants | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| The album the audio file is from, if any Type: TEXT | |||||||||||
| The id of the album the audio file is from, if any Type: INTEGER (long) | |||||||||||
| A non human readable key calculated from the ALBUM, used for searching, sorting and grouping Type: TEXT | |||||||||||
| The artist who created the audio file, if any Type: TEXT | |||||||||||
| The id of the artist who created the audio file, if any Type: INTEGER (long) | |||||||||||
| A non human readable key calculated from the ARTIST, used for searching, sorting and grouping Type: TEXT | |||||||||||
| The position, in ms, playback was at when playback for this file was last stopped. | |||||||||||
| The composer of the audio file, if any Type: TEXT | |||||||||||
| The duration of the audio file, in ms Type: INTEGER (long) | |||||||||||
| Non-zero if the audio file may be an alarm Type: INTEGER (boolean) | |||||||||||
| Non-zero if the audio file is music Type: INTEGER (boolean) | |||||||||||
| Non-zero if the audio file may be a notification sound Type: INTEGER (boolean) | |||||||||||
| Non-zero if the audio file is a podcast Type: INTEGER (boolean) | |||||||||||
| Non-zero if the audio file may be a ringtone Type: INTEGER (boolean) | |||||||||||
| A non human readable key calculated from the TITLE, used for searching, sorting and grouping Type: TEXT | |||||||||||
| The track number of this song on the album, if any. | |||||||||||
| The year the audio file was recorded, if any Type: INTEGER | |||||||||||
| Inherited Constants | ||||||||||||||||||||||||||||||||
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From interface
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From interface
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| Fields | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| public static final | The content:// style URI for the "primary" external storage volume. | ||||||||||
| public static final | The content:// style URI for the internal storage. | ||||||||||
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