使用MeidaStore.Audio获得手机中的音频文件

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);