android 图片、音频、视频获取以及多媒体数据库学习

最新推荐文章于 2017-05-02 09:51:00 发布

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最新推荐文章于 2017-05-02 09:51:00 发布

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分类专栏： android

本文链接：https://blog.youkuaiyun.com/actual_/article/details/8281098

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本文介绍了Android多媒体数据库的结构，包括存储位置、主要表如Images、Thumbnails、Video及Audio，以及如何通过MediaStore类访问这些信息。重点关注了图片、音频、视频的基本信息和缩略图存储，并提供了相应的URI接口。

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android 多媒体数据库，存储于/data/data/com.android.providers.media/databases目录下，有两个db，一个是内部存储数据，一个手机存储卡数据。

一）基本表

图片存储有两张表：

1）Images ：字段可以看出主要存储图片信息

2）Thumbnails：和Images表对应，存储图片缩略图信息。

视频两张表，同图片类似

1）Video表，存储视频基本信息

2）Thumbnails：存储音频的缩略图等信息。

音频存储表：

1）Audio表，音频基本信息

2）另外有专辑，歌手信息的表格

二）系统提供的接口

可以读下package android.provider.MediaStore类，class Images、class Audio以及class Video

MediaStore.Audio.AlbumColumns	Columns representing an album
MediaStore.Audio.ArtistColumns	Columns representing an artist
MediaStore.Audio.AudioColumns	Columns for audio file that show up in multiple tables.
MediaStore.Audio.GenresColumns	Columns representing an audio genre
MediaStore.Audio.PlaylistsColumns	Columns representing a playlist
MediaStore.Files.FileColumns	Fields for master table for all media files.
MediaStore.Images.ImageColumns
MediaStore.MediaColumns	Common fields for most MediaProvider tables
MediaStore.Video.VideoColumns

class:

MediaStore	The Media provider contains meta data for all available media on both internal and external storage devices.
MediaStore.Audio	Container for all audio content.
MediaStore.Audio.Albums	Contains artists for audio files
MediaStore.Audio.Artists	Contains artists for audio files
MediaStore.Audio.Artists.Albums	Sub-directory of each artist containing all albums on which a song by the artist appears.
MediaStore.Audio.Genres	Contains all genres for audio files
MediaStore.Audio.Genres.Members	Sub-directory of each genre containing all members.
MediaStore.Audio.Media
MediaStore.Audio.Playlists	Contains playlists for audio files
MediaStore.Audio.Playlists.Members	Sub-directory of each playlist containing all members.
MediaStore.Files	Media provider table containing an index of all files in the media storage, including non-media files.
MediaStore.Images	Contains meta data for all available images.
MediaStore.Images.Media
MediaStore.Images.Thumbnails	This class allows developers to query and get two kinds of thumbnails: MINI_KIND: 512 x 384 thumbnail MICRO_KIND: 96 x 96 thumbnail
MediaStore.Video
MediaStore.Video.Media
MediaStore.Video.Thumbnails	This class allows developers to query and get two kinds of thumbnails: MINI_KIND: 512 x 384 thumbnail MICRO_KIND: 96 x 96 thumbnail

图片的uri为：

MediaStore.Images.Media

public static final Uri	EXTERNAL_CONTENT_URI	The content:// style URI for the "primary" external storage volume.
public static final Uri	INTERNAL_CONTENT_URI	The content:// style URI for the internal storage.

分别为内部存储和存储卡存储的图片信息。

音频，视频类似。

暂时了解这么多……