获取SD卡中的音乐文件

/**
* 获取SD卡中的音乐文件
*
* @param context
* @return
*/
public static ArrayList<Music> getMusicFile(Context context) {
//ArrayList<Music>存放音乐
ArrayList<Music> MusicFiles = new ArrayList<>();
//查询媒体数据库
ContentResolver resolver = context.getContentResolver();
/**
* Uri：这个Uri代表要查询的数据库名称加上表的名称。
这个Uri一般都直接从MediaStore里取得，比如我要取全部歌的信息，
就必须利用MediaStore.Audio.Media. EXTERNAL _CONTENT_URI这个Uri。

*
*/
Cursor cursor = resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
//遍历媒体数据库
if (cursor.moveToFirst()) {
while (!cursor.isAfterLast()) {
//歌曲编号MediaStore.Audio.Media._ID
int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID));

//歌曲标题
String title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));

//歌曲的专辑名MediaStore.Audio.Media.ALBUM
String album = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM));

//歌曲的歌手名MediaStore.Audio.Media.ARTIST
String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));

//歌曲文件的路径MediaStore.Audio.Media.DATA
String url = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));

//歌曲的总播放时长MediaStore.Audio.Media.DURATION
int duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));

//歌曲文件的大小MediaStore.Audio.Media.SIZE
long size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE));

if (size > 1024 * 800) {     //是否大于800K
if (title.equals("<unknown>") || title.equals("")) {
title = "未知";
}
if ("<unknown>".equals(artist) || "".equals(artist)) {
artist = "未知";
}

Music music = new Music(id, title, artist,
url, album, duration, size);
MusicFiles.add(music);
}
cursor.moveToNext();
}
}
return MusicFiles;
}

public class Music  {
private int id;
private String name;
private String singerName;
private String url;
private String album;
private int totalTime;
private long size;

public Music(int id, String name, String singerName,
String url, String album, int totalTime, long size) {
this.id = id;
this.name = name;
this.singerName = singerName;
this.url = url;
this.album = album;
this.totalTime = totalTime;
this.size = size;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getSingerName() {
return singerName;
}

public void setSingerName(String singerName) {
this.singerName = singerName;
}

public String getUrl() {
return url;
}

public void setUrl(String url) {
this.url = url;
}

public String getAlbum() {
return album;
}

public void setAlbum(String album) {
this.album = album;
}

public int getTotalTime() {
return totalTime;
}

public void setTotalTime(int totalTime) {
this.totalTime = totalTime;
}

public long getSize() {
return size;
}

public void setSize(long size) {
this.size = size;
}
}