MediaStore提供了对数据库管理的对应信息，并且封装了相关的方法方便上层调用。路径如下：
/frameworks/base/core/java/android/provider/ MediaStore.java
(The Media provider contains meta data for all available media on both internal and external storage devices.)
1. 类结构图
下面对这些类进行分析并且总结一下方法和字段。
首先，是MediaStore类的相关信息，包含在内部存储和外部存储的所有的多媒体文件元数据，提供相应方法和字段。
2. 字段
| 字段 |
解析 |
| ACTION_IMAGE_CAPTURE |
标准的intent action，发送给相机应用，拍摄照片并返回 |
| ACTION_IMAGE_CAPTURE_SECURE |
发送给相机应用，拍摄照片并返回，设备被固定 |
| ACTION_VIDEO_CAPTURE |
标准的intent action，发送给相机应用，录制视频并返回 |
| AUTHORITY |
"media" |
| EXTRA_DURATION_LIMIT |
指定录像时长的最大值 |
| EXTRA_FINISH_ON_COMPLETION |
Intent-extra的名字用来控制MovieView 的onCompletion方法 |
| EXTRA_FULL_SCREEN |
Intent-extra的名字用来控制ViewImage的UI |
| EXTRA_MEDIA_ALBUM |
Intent-extra的名字用来定义album |
| EXTRA_MEDIA_ARTIST |
Intent-extra的名字用来定义artist |
| EXTRA_MEDIA_FOCUS |
Intent-extra的名字用来定义search focus. |
| EXTRA_MEDIA_TITLE |
Intent-extra的名字用来定义 song title |
| EXTRA_OUTPUT |
Intent-extra的名字用来表示一个存储图片和视频content resolver 的Uri. |
| EXTRA_SCREEN_ORIENTATION |
Intent-extra的名字用来控制ViewImage或者MovieView. |
| EXTRA_SHOW_ACTION_ICONS |
Intent-extra的名字用来控制ViewImage的UI. |
| EXTRA_SIZE_LIMIT |
指定最大字长. |
| EXTRA_VIDEO_QUALITY |
Intent-extra的名字用来控制录制视频的质量. |
| INTENT_ACTION_MEDIA_PLAY_FROM_SEARCH |
一个显示搜索音乐并且自动播放的Intent |
| INTENT_ACTION_MEDIA_SEARCH |
Activity Action: 显示搜索音乐. |
| INTENT_ACTION_MUSIC_PLAYER |
This constant was deprecated in API level 15. Use CATEGORY_APP_MUSIC instead. |
| INTENT_ACTION_STILL_IMAGE_CAMERA |
Intent action在图片模式下启动camera. |
| INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE |
Intent action在图片模式下启动camera，设备被锁定 |
| INTENT_ACTION_TEXT_OPEN_FROM_SEARCH |
显示搜索可读media文件并且自动播放的intent |
| INTENT_ACTION_VIDEO_CAMERA |
Intent action 在录像模式下启动相机 |
| INTENT_ACTION_VIDEO_PLAY_FROM_SEARCH |
An intent to perform a search for video media and automatically play content from the result when possible. |
| MEDIA_IGNORE_FILENAME |
Name of the file signaling the media scanner to ignore media in the containing directory and its subdirectories. |
| MEDIA_SCANNER_VOLUME |
Name of current volume being scanned by the media scanner. |
| UNKNOWN_STRING |
The string that is used when a media attribute is not known. |
3. 方法
| 方法名 |
解析 |
| getMediaScannerUri() |
Uri for querying the state of the media scanner. |
| getVersion(Context context) |
Get the media provider's version. |
4. MediaStore内部类
根据上面的类结构图可知，对于MediaStore内部类的属性也非常重要，下面就其内部类相关信息进行总结。
4.1 Media.Audio
Media.Audio是所有音频文件的容器。下面分析的是其内部类、字段和方法。
4.1.1 MediaStore.Audio.AlbumColumns
代表一张专辑的列。
| 字段 |
解析 |
| ALBUM |
The album on which the audio file appears, if any |
| ALBUM_ART |
Cached album art. |
| ALBUM_ID |
The id for the album |
| ALBUM_KEY |
A non human readable key calculated from the ALBUM, used for searching, sorting and grouping |
| ARTIST |
The artist whose songs appear on this album |
| FIRST_YEAR |
The year in which the earliest songs on this album were released. |
| LAST_YEAR |
The year in which the latest songs on this album were released. |
| NUMBER_OF_SONGS |
The number of songs on this album |
| NUMBER_OF_SONGS_FOR_ARTIST |
This column is available when getting album info via artist, and indicates the number of songs on the album by the given artist. |
4.1.2 MediaStore.Audio.Albums
艺术家，继承BaseColumns, AlbumColumns接口
| 字段 |
解析 |
| CONTENT_TYPE |
The MIME type for this table. |
| DEFAULT_SORT_ORDER |
The default sort order for this table |
| ENTRY_CONTENT_TYPE |
The MIME type for entries in this table. |
| 方法 |
解析 |
| getContentUri(String volumeName) |
Get the content:// style URI for the albums table on the given volume. |
4.1.3 MediaStore.Audio.ArtistColumns
代表一个艺术家的列
| 字段 |
解析 |
| ARTIST |
The artist who created the audio file, if any |
| ARTIST_KEY |
A non human readable key calculated from the ARTIST, used for searching, sorting and grouping |
| NUMBER_OF_ALBUMS |
The number of albums in the database for this artist |
| NUMBER_OF_TRACKS |
The number of albums in the database for this artist |
4.1.4 MediaStore.Audio.Artists
艺术家 ，继承BaseColumns, ArtistColumns接口
| 内部类 |
解析 |
| MediaStore.Audio.Artists.Albums |
对于每个艺术家所包含的所有专辑的子目录 |
| 字段 |
解析 |
| CONTENT_TYPE |
The MIME type for this table. |
| DEFAULT_SORT_ORDER |
The default sort order for this table |
| ENTRY_CONTENT_TYPE |
The MIME type for entries in this table. |
| EXTERNAL_CONTENT_URI |
The content:// style URI for the "primary" external storage volume. |
| INTERNAL_CONTENT_URI |
The content:// style URI for the internal storage. |
| 方法 |
解析 |
| getContentUri(String volumeName) |
Get the content:// style URI for the artists table on the given volume. |
4.1.5 MediaStore.Audio.AudioColumns
在多个表中展示出来的音频文件的列
| 字段 |
解析 |
| ALBUM |
The album the audio file is from, if any |
| ALBUM_ID |
The id of the album the audio file is from, if any |
| ALBUM_KEY |
A non human readable key calculated from the ALBUM, used for searching, sorting and grouping |
| ARTIST |
The artist who created the audio file, if any |
| ARTIST_ID |
The id of the artist who created the audio file, if any |
| ARTIST_KEY |
A non human readable key calculated from the ARTIST, used for searching, sorting and grouping |
| BOOKMARK |
The position, in ms, playback was at when playback for this file was last stopped. |
| COMPOSER |
The composer of the audio file, if any |
| DURATION |
The duration of the audio file, in ms |
| IS_ALARM |
Non-zero if the audio file may be an alarm |
| IS_MUSIC |
Non-zero if the audio file is music |
| IS_NOTIFICATION |
Non-zero if the audio file may be a notification sound |
| IS_PODCAST |
Non-zero if the audio file is a podcast |
| IS_RINGTONE |
Non-zero if the audio file may be a ringtone |
| TITLE_KEY |
A non human readable key calculated from the TITLE, used for searching, sorting and grouping |
| TRACK |
The track number of this song on the album, if any. |
| YEAR |
The year the audio file was recorded, if any |
4.1.6 MediaStore.Audio.Genres
包含音频文件的流派，继承BaseColumns, GenresColumns
| 内部类 |
解析 |
| MediaStore.Audio.Genres.Members |
对于每种流派所包含的所有成员的子目录 |
| 字段 |
解析 |
| CONTENT_TYPE |
The MIME type for this table. |
| DEFAULT_SORT_ORDER |
The default sort order for this table |
| ENTRY_CONTENT_TYPE |
The MIME type for entries in this table. |
| EXTERNAL_CONTENT_URI |
The content:// style URI for the "primary" external storage volume. |
| INTERNAL_CONTENT_URI |
The content:// style URI for the internal storage. |
| 方法 |
解析 |
| getContentUri(String volumeName) |
Get the content:// style URI for the audio genres table on the given volume. |
| getContentUriForAudioId(String volumeName, int audioId) |
Get the content:// style URI for querying the genres of an audio file. |
4.1.7 MediaStore.Audio.GenresColumns
代表一个音频流派的列
| 字段 |
解析 |
| NAME |
The name of the genre |
4.1.8 MediaStore.Audio.Media
继承自AudioColumns
| 字段 |
解析 |
| CONTENT_TYPE |
The MIME type for this table. |
| DEFAULT_SORT_ORDER |
The default sort order for this table |
| ENTRY_CONTENT_TYPE |
The MIME type for an audio track. |
| EXTRA_MAX_BYTES |
The name of the Intent-extra used to define a maximum file size for a recording made by the SoundRecorder application. |
| RECORD_SOUND_ACTION |
Activity Action: Start SoundRecorder application. |
| EXTERNAL_CONTENT_URI |
The content:// style URI for the "primary" external storage volume. |
| INTERNAL_CONTENT_URI |
The content:// style URI for the internal storage. |
| 方法 |
解析 |
| getContentUri(String volumeName) |
Get the content:// style URI for the audio media table on the given volume. |
| getContentUriForPath(String path) |
4.1.9 MediaStore.Audio.Playlists
包含音频文件的播放列表
| 内部类 |
解析 |
| MediaStore.Audio.Playlists.Members |
每个播放列表所包含的所有成员的子目录 |
| 字段 |
解析 |
| CONTENT_TYPE |
The MIME type for this table. |
| DEFAULT_SORT_ORDER |
The default sort order for this table |
| ENTRY_CONTENT_TYPE |
The MIME type for entries in this table. |
| EXTERNAL_CONTENT_URI |
The content:// style URI for the "primary" external storage volume. |
| INTERNAL_CONTENT_URI |
The content:// style URI for the internal storage. |
| 方法 |
解析 |
| getContentUri(String volumeName) |
Get the content:// style URI for the audio playlists table on the given volume. |
4.1.10 MediaStore.Audio.PlaylistsColumns
代表播放列表的列
| 字段 |
解析 |
| DATA |
Path to the playlist file on disk. |
| DATE_ADDED |
The time the file was added to the media provider Units are seconds since 1970. |
| DATE_MODIFIED |
The time the file was last modified Units are seconds since 1970. |
| NAME |
The name of the playlist |
4.1.11 MediaStore.Audio.Radio
音频文件中的收音机文件
| 字段 |
解析 |
| ENTRY_CONTENT_TYPE |
The MIME type for entries in this table. |
4.2 Media.Files
Media provider的表，包含了多媒体存储中所有文件的索引，包括非多媒体文件。这个类可以在单词查询中处理多媒体文件和非多媒体文件。
| 方法 |
解析 |
| getContentUri(String volumeName) |
Get the content:// style URI for the files table on the given volume. |
| getContentUri(String volumeName, long rowId) |
Get the content:// style URI for a single row in the files table on the given volume. |
4.2.1 MediaStore.Files.FileColumns
所有多媒体文件的主表字段
| 字段 |
解析 |
| MEDIA_TYPE |
The media type (audio, video, image or playlist) of the file, or 0 for not a media file |
| MEDIA_TYPE_AUDIO |
Constant for the MEDIA_TYPE column indicating that file is an audio file. |
| MEDIA_TYPE_IMAGE |
Constant for the MEDIA_TYPE column indicating that file is an image file. |
| MEDIA_TYPE_NONE |
Constant for the MEDIA_TYPE column indicating that file is not an audio, image, video or playlist file. |
| MEDIA_TYPE_PLAYLIST |
Constant for the MEDIA_TYPE column indicating that file is a playlist file. |
| MEDIA_TYPE_VIDEO |
Constant for the MEDIA_TYPE column indicating that file is a video file. |
| MIME_TYPE |
The MIME type of the file |
| PARENT |
The index of the parent directory of the file |
| TITLE |
The title of the content |
4.3 MediaStore.Images
包含所有可用图片的元数据。下面是对其内部类的整理：
4.3.1 MediaStore.Images.ImageColumns
代表所有图片文件的列
| 字段 |
解析 |
| BUCKET_DISPLAY_NAME |
The bucket display name of the image. |
| BUCKET_ID |
The bucket id of the image. |
| DATE_TAKEN |
The date & time that the image was taken in units of milliseconds since jan 1, 1970. |
| DESCRIPTION |
The description of the image |
| IS_PRIVATE |
Whether the video should be published as public or private |
| LATITUDE |
The latitude where the image was captured. |
| LONGITUDE |
The longitude where the image was captured. |
| MINI_THUMB_MAGIC |
The mini thumb id. |
| ORIENTATION |
The orientation for the image expressed as degrees. |
| PICASA_ID |
The picasa id of the image |
4.3.2 MediaStore.Images.Media
提供各种操作方法，继承ImageColumns
| 字段 |
解析 |
| CONTENT_TYPE |
The MIME type of of this directory of images. |
| DEFAULT_SORT_ORDER |
The default sort order for this table |
| EXTERNAL_CONTENT_URI |
The content:// style URI for the "primary" external storage volume. |
| INTERNAL_CONTENT_URI |
The content:// style URI for the internal storage. |
| 方法 |
解析 |
| getBitmap(ContentResolver cr, Uri url) |
Retrieves an image for the given url as a Bitmap. |
| getContentUri(String volumeName) |
Get the content:// style URI for the image media table on the given volume. |
| insertImage(ContentResolver cr, String imagePath, String name, String description) |
Insert an image and create a thumbnail for it. |
| insertImage(ContentResolver cr, Bitmap source, String title, String description) |
Insert an image and create a thumbnail for it. |
| query(ContentResolver cr, Uri uri, String[] projection) |
| query(ContentResolver cr, Uri uri, String[] projection, String where,String orderBy) |
| query(ContentResolver cr, Uri uri, String[] projection, String selection,String[] selectionArgs, String orderBy) |
4.3.3 MediaStore.Images.Thumbnails
这个类允许开发者去查询并且得到两种略缩图，MINI_KIND: 512 x 384 thumbnail MICRO_KIND: 96 x 96 thumbnail
| 字段 |
解析 |
| DATA |
Path to the thumbnail file on disk. |
| DEFAULT_SORT_ORDER |
The default sort order for this table |
| FULL_SCREEN_KIND |
| HEIGHT |
The height of the thumbnail |
| IMAGE_ID |
The original image for the thumbnal |
| KIND |
The kind of the thumbnail |
| MICRO_KIND |
| MINI_KIND |
| THUMB_DATA |
The blob raw data of thumbnail |
| WIDTH |
The width of the thumbnal |
| EXTERNAL_CONTENT_URI |
The content:// style URI for the "primary" external storage volume. |
| INTERNAL_CONTENT_URI |
The content:// style URI for the internal storage. |
| 方法 |
解析 |
| cancelThumbnailRequest(ContentResolver cr, long origId) |
This method cancels the thumbnail request so clients waiting for getThumbnail will be interrupted and return immediately. |
| cancelThumbnailRequest(ContentResolver cr, long origId, long groupId) |
This method cancels the thumbnail request so clients waiting for getThumbnail will be interrupted and return immediately. |
| getContentUri(String volumeName) |
Get the content:// style URI for the image media table on the given volume. |
| getThumbnail(ContentResolver cr, long origId, long groupId, int kind, BitmapFactory.Options options) |
This method checks if the thumbnails of the specified image (origId) has been created. |
| getThumbnail(ContentResolver cr, long origId, int kind, BitmapFactory.Options options) |
This method checks if the thumbnails of the specified image (origId) has been created. |
| query(ContentResolver cr, Uri uri, String[] projection) |
| queryMiniThumbnail(ContentResolver cr, long origId, int kind, String[] projection) |
| queryMiniThumbnails(ContentResolver cr, Uri uri, int kind, String[] projection) |
4.4 MediaStore.MediaColumns
大多数MediaProvider表的常见字段。
| 字段 |
解析 |
| DATA |
Path to the file on disk. |
| DATE_ADDED |
The time the file was added to the media provider Units are seconds since 1970. |
| DATE_MODIFIED |
The time the file was last modified Units are seconds since 1970. |
| DISPLAY_NAME |
The display name of the file |
| HEIGHT |
The height of the image/video in pixels. |
| MIME_TYPE |
The MIME type of the file |
| SIZE |
The size of the file in bytes |
| TITLE |
The title of the content |
| WIDTH |
The width of the image/video in pixels. |
4.5 MediaStore.Video
包含视频文件的元数据，并提供相应字段和方法。
| 方法 |
解析 |
| query(ContentResolver cr, Uri uri, String[] projection) |
4.5.1 MediaStore.Video.Media
提供和获取视频文件的Uri，继承VideoColumns
| 字段 |
解析 |
| CONTENT_TYPE |
The MIME type for this table. |
| DEFAULT_SORT_ORDER |
The default sort order for this table |
| EXTERNAL_CONTENT_URI |
The content:// style URI for the "primary" external storage volume. |
| INTERNAL_CONTENT_URI |
The content:// style URI for the internal storage. |
| 方法 |
解析 |
| getContentUri(String volumeName) |
Get the content:// style URI for the video media table on the given volume. |
4.5.2 MediaStore.Video.Thumbnails
这个类让开发者去查询并且得到两种略缩图：MINI_KIND: 512 x 384 thumbnail MICRO_KIND: 96 x 96 thumbnail
| 字段 |
解析 |
| DATA |
Path to the thumbnail file on disk. |
| DEFAULT_SORT_ORDER |
The default sort order for this table |
| FULL_SCREEN_KIND |
| HEIGHT |
The height of the thumbnail |
| KIND |
The kind of the thumbnail |
| MICRO_KIND |
| MINI_KIND |
| VIDEO_ID |
The original image for the thumbnal |
| WIDTH |
The width of the thumbnal |
| EXTERNAL_CONTENT_URI |
The content:// style URI for the "primary" external storage volume. |
| INTERNAL_CONTENT_URI |
The content:// style URI for the internal storage. |
| 方法 |
解析 |
| cancelThumbnailRequest(ContentResolver cr, long origId) |
This method cancels the thumbnail request so clients waiting for getThumbnail will be interrupted and return immediately. |
| cancelThumbnailRequest(ContentResolver cr, long origId, long groupId) |
This method cancels the thumbnail request so clients waiting for getThumbnail will be interrupted and return immediately. |
| getContentUri(String volumeName) |
Get the content:// style URI for the image media table on the given volume. |
| getThumbnail(ContentResolver cr, long origId, long groupId, int kind, BitmapFactory.Options options) |
This method checks if the thumbnails of the specified image (origId) has been created. |
| getThumbnail(ContentResolver cr, long origId, int kind, BitmapFactory.Options options) |
This method checks if the thumbnails of the specified image (origId) has been created. |
4.5.3 MediaStore.Video.VideoColumns
代表所有视频文件的列
| 字段 |
解析 |
| ALBUM |
The album the video file is from, if any |
| ARTIST |
The artist who created the video file, if any |
| BOOKMARK |
The bookmark for the video. |
| BUCKET_DISPLAY_NAME |
The bucket display name of the video. |
| BUCKET_ID |
The bucket id of the video. |
| CATEGORY |
The YouTube category of the video |
| DATE_TAKEN |
The date & time that the video was taken in units of milliseconds since jan 1, 1970. |
| DESCRIPTION |
The description of the video recording |
| DURATION |
The duration of the video file, in ms |
| IS_PRIVATE |
Whether the video should be published as public or private |
| LANGUAGE |
The language of the video |
| LATITUDE |
The latitude where the video was captured. |
| LONGITUDE |
The longitude where the video was captured. |
| MINI_THUMB_MAGIC |
The mini thumb id. |
| RESOLUTION |
The resolution of the video file, formatted as "XxY" |
| TAGS |
The user-added tags associated with a video |
