Obtain Audio Information through mediastore

The Android system provides interfaces such as mediascanner, mediaprovider, and mediastore, as well as a set of database tables, which are provided to users through content providers. When a mobile phone is turned on or has SD card plugging or removal, the system will automatically scan the media files on the SD card and mobile phone memory, such as audio, video, and images, put the corresponding information in the defined database table. In this program, we do not need to worry about how to scan files in the mobile phone, as long as we know how to query and use this information. Mediastore defines a series of data tables. Through the query interface provided by contentresolver, we can obtain various required information. The following describes how to query the music file information on the SD card.
First, let's take a look at the contentresolver query interface:
Cursor query (URI Uri, string [] projection, string selection, string [] selectionargs, string sortorder );

Uri: specify the name of the database to be queried and the name of the table. From mediastore, we can find the parameters for the corresponding information. For details, refer to the development documentation.
Projection: Specifies the columns in the database table to be queried. The returned cursor contains the corresponding information. Null returns all information.
Selection: Specify query Conditions
Selectionargs: Which of the following are in the selection parameter? This symbol is used to replace the question mark with the actual value. If selection does not exist? Then, the string array can be null.
Sortorder: Specify the order of query results
The following command returns information about all music files on the external memory card:
Cursor cursor = query (mediastore. Audio. Media. external_content_uri, null, null, mediastore. Audio. Media. default_sort_order );
After obtaining the cursor, we can call the specific music information of the cursor method:
Song ID: mediastore. Audio. Media. _ id

Int id = cursor. getint (cursor. getcolumnindexorthrow (mediastore. Audio. Media. _ id ));

Song name: mediastore. Audio. Media. titl
String tilte = cursor. getstring (cursor. getcolumnindexorthrow (mediastore. Audio. Media. Title ));

Album name: mediastore. Audio. Media. Album
String album = cursor. getstring (cursor. getcolumnindexorthrow (mediastore. Audio. Media. album ));

Artist name: mediastore. Audio. Media. Artist
String artist = cursor. getstring (cursor. getcolumnindexorthrow (mediastore. Audio. Media. Artist ));

Full path of the song file: mediastore. Audio. Media. Data

String url = cursor. getstring (cursor. getcolumnindexorthrow (mediastore. Audio. Media. Data ));

Name of the song file: mediastroe. Audio. Media. display_name

String display_name = cursor. getstring (cursor. getcolumnindexorthrow (mediastore. Audio. Media. display_name ));

Release Date of the song file: mediastore. Audio. Media. Year
String year = cursor. getstring (cursor. getcolumnindexorthrow (mediastore. Audio. Media. Year ));

Total playback duration of a song: mediastore. Audio. Media. Duration
Int duration = cursor. getint (cursor. getcolumnindexorthrow (mediastore. Audio. Media. duration ));

Size of the song file: mediastore. Audio. Media. Size
Int size = cursor. getlong (cursor. getcolumnindexorthrow (mediastore. Audio. Media. Size ));