使用MeidaStore.Audio获得手机中的音频文件

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MediaStore是安卓系统自带的多媒体系统数据库，他在每次开机时刷新一次，可以通过Cursor这个类对数据库进行访问与修改，修改之后需用广播强制刷新。

使用Cursor必须通过Context获得ContentResolver的对象实例。

Cursor cursor1 = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,null,null,null);

View Code

代码中的context既是调用该函数的活动的对象，先上个封装了音乐信息的类

public class Music {    private String filename;    private String title;    private int during;    private String singer;    private String type;    private String size;    private String fileUrl;    public Music(String filename,String title,int during,String singer,String type,String size,String fileUrl){        this.filename = filename;        this.title = title;        this.during = during;        this.singer = singer;        this.type = type;        this.size = size;        this.fileUrl = fileUrl;    }    public String toString(){        return "song[filename="+filename+", title="+title+", during="+during+", singer="+singer+", type="+type+", size="+size+", fileUrl="+fileUrl+"]";    }    public String getFilename() {        return filename;    }    public void setFilename(String filename) {        this.filename = filename;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public int getDuring() {        return during;    }    public void setDuring(int during) {        this.during = during;    }    public String getSinger() {        return singer;    }    public void setSinger(String singer) {        this.singer = singer;    }    public String getType() {        return type;    }    public void setType(String type) {        this.type = type;    }    public String getSize() {        return size;    }    public void setSize(String size) {        this.size = size;    }    public String getFileUrl() {        return fileUrl;    }    public void setFileUrl(String fileUrl) {        this.fileUrl = fileUrl;    }    }

下面就是用Cursor操作数据库的帮助类了

public class MusicHelper{    public static List<Music> songs = new ArrayList<Music>();    public static List<Music> getAllsongs(Context context){            Cursor cursor1 = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,null,null,null);            getcorrSongs(cursor1);            Cursor cursor2 = context.getContentResolver().query(MediaStore.Audio.Media.INTERNAL_CONTENT_URI,null,null,null,null);            getcorrSongs(cursor2);        return songs;    }    public static void getcorrSongs(Cursor cursor){        Music song = null;        if(cursor != null){            while(cursor.moveToNext()){                String filename = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME));                String title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));                int during = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));                String singer = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));                String type = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.MIME_TYPE));                String size = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE));                String date = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));                song = new Music(filename,title,during,singer,type,size,date);                songs.add(song);            }                cursor.close();        }    }}

参数content即用活动的this引用传入。

allsongs = MusicHelper.getAllsongs(this);

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