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前面已经添加了权限，有权限后可以去数据库读取音乐文件，一般可以获取全部音乐、专辑、歌手、流派等。

1. 获取全部音乐数据

class MusicHelper {companion object {@SuppressLint("Range")fun getMusic(context: Context): MutableList<MusicData> {var songNumber = 0val songsList: MutableList<MusicData> = ArrayList() //用于装歌曲数据val contentResolver: ContentResolver = context.contentResolvervar cursor: Cursor? = nulltry {cursor = contentResolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null, null, null, null);if (cursor != null) {while (cursor.moveToNext()) {//是否是音频val isMusic =cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.IS_MUSIC))//时长val duration =cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION))//是音乐并且时长大于30秒if (isMusic != 0 && duration >= 30 * 1000) {//歌名val title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE))//歌手val artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));//专辑idval albumId =cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID))//文件路径val dataPath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA))val data: String =cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.AudioColumns.DATA))val id = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media._ID))val music = MusicData(id, -1, albumId, title, artist, "", data, duration, songNumber, dataPath)songsList.add(music)songNumber++}}}} catch (e: Exception) {e.printStackTrace();} finally {cursor?.close()}return songsList}}
}

数据类MusicData

import java.io.Serializabledata class MusicData(val id: Long,val artistId: Int,val albumId: Long,val title: String,val artist: String,val album: String,val data:String,val duration: Long,val songSize: Int,val path:String
) : Serializable

2. 获取流派音乐数据

   /*** 获取所有流派** @param context* @return*/@SuppressLint("Range")fun getGenres(context: Context): List<GenresData?> {val cursor = context.contentResolver.query(MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI, null, null, null, null)var genresList: MutableList<GenresData?> = ArrayList()if (cursor != null) {genresList = java.util.ArrayList(cursor.count)while (cursor.moveToNext()) {val id = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Genres._ID))val name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Genres.NAME))genresList.add(GenresData(id, name))}cursor.close()}return genresList}

数据类

data class GenresData(val id: Long, val name: String, val count: Int) {
}

获取艺术家

  /*** 获取艺术家* @param context*/fun getArtistsForCursor(context: Context): List<ArtistData> {val artistSortOrder = PreferencesUtility.getInstance(context).artistSortOrderval cursor: Cursor? = context.contentResolver.query(MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI,arrayOf(DATA, ARTIST, NUMBER_ALBUM, NUMBER_TRACK),null,null,artistSortOrder)val arrayList: MutableList<ArtistData> = ArrayList()if (cursor != null && cursor.moveToFirst()) do {val artist = ArtistData(cursor.getLong(0), cursor.getString(1), cursor.getInt(2), cursor.getInt(3))arrayList.add(artist)} while (cursor.moveToNext())cursor?.close()return arrayList}

数据类

data class ArtistData(val id: Long, val name: String, val count: Int, val num: Int) {
}

完整代码

package com.zong.musiclib.helperimport android.annotation.SuppressLint
import android.content.ContentResolver
import android.content.Context
import android.database.Cursor
import android.provider.MediaStore
import com.zong.musiclib.utils.PreferencesUtilityobject MusicHelper {private const val DATA = "_id"private const val ARTIST = "artist"private const val NUMBER_ALBUM = "number_of_albums"private const val NUMBER_TRACK = "number_of_tracks"@SuppressLint("Range")fun getMusic(context: Context): MutableList<MusicData> {var songNumber = 0val songsList: MutableList<MusicData> = ArrayList() //用于装歌曲数据val contentResolver: ContentResolver = context.contentResolvervar cursor: Cursor? = nulltry {cursor = contentResolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null, null, null, null);if (cursor != null) {while (cursor.moveToNext()) {//是否是音频val isMusic =cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.IS_MUSIC))//时长val duration =cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION))//是音乐并且时长大于30秒if (isMusic != 0 && duration >= 30 * 1000) {//歌名val title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE))//歌手val artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));//专辑idval albumId =cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID))//文件路径val dataPath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA))val data: String =cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.AudioColumns.DATA))val id = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media._ID))val music = MusicData(id, -1, albumId, title, artist, "", data, duration, songNumber, dataPath)songsList.add(music)songNumber++}}}} catch (e: Exception) {e.printStackTrace();} finally {cursor?.close()}return songsList}/*** 获取所有流派** @param context* @return*/@SuppressLint("Range")fun getGenres(context: Context): List<GenresData?> {val cursor = context.contentResolver.query(MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI, null, null, null, null)var genresList: MutableList<GenresData?> = ArrayList()if (cursor != null) {genresList = java.util.ArrayList(cursor.count)while (cursor.moveToNext()) {val id = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Genres._ID))val name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Genres.NAME))genresList.add(GenresData(id, name))}cursor.close()}return genresList}/*** 获取艺术家* @param context*/fun getArtistsForCursor(context: Context): List<ArtistData> {val artistSortOrder = PreferencesUtility.getInstance(context).artistSortOrderval cursor: Cursor? = context.contentResolver.query(MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI,arrayOf(DATA, ARTIST, NUMBER_ALBUM, NUMBER_TRACK),null,null,artistSortOrder)val arrayList: MutableList<ArtistData> = ArrayList()if (cursor != null && cursor.moveToFirst()) do {val artist = ArtistData(cursor.getLong(0), cursor.getString(1), cursor.getInt(2), cursor.getInt(3))arrayList.add(artist)} while (cursor.moveToNext())cursor?.close()return arrayList}}