获取一个目录的音乐文件 [英] Get music-files of one directory

问题描述

在我们的应用程序，我们希望得到一个特定的文件夹中的音乐文件。我们要做到这一点，使用媒体商店。

因此​​，我们有一个路径到/ mnt / SD / DIR这个音乐，我们需要不的子目录中的所有文件。

我们试图使一个子查询，但它不工作。

 公开的ArrayList＆LT;宋＆GT; getAudioFilesOfDir（字符串pathDirectory）
    {
        ArrayList的＆LT;宋＆GT;歌曲=新的ArrayList＆LT;宋＆GT;（）;        //某些音频可能会被明确标记为不被音乐
        串选择= MediaStore.Audio.Media.IS_MUSIC + android.provider.MediaStore.Audio.Media.DATA.substring（pathDirectory.length（））含有（/）= 0 AND @。        的String [] =投影{
                MediaStore.Audio.Media._ID，
                MediaStore.Audio.Media.DATA，
                MediaStore.Audio.Media.TRACK，
                MediaStore.Audio.Media.YEAR，
                MediaStore.Audio.Media.DURATION，
                MediaStore.Audio.Media.ALBUM_ID，
                MediaStore.Audio.Media.ALBUM，
                MediaStore.Audio.Media.ALBUM_KEY，
                MediaStore.Audio.Media.TITLE，
                MediaStore.Audio.Media.TITLE_KEY，
                MediaStore.Audio.Media.ARTIST_ID，
                MediaStore.Audio.Media.ARTIST
        };        ContentResolver的CR = CoreLib.Context（）getContentResolver（）。        光标光标= cr.query（
                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI，
                投影，
                选择，
                空值，
                MediaStore.Audio.Media._ID）;        INT _ID_Column = cursor.getColumnIndex（MediaStore.Audio.Media._ID）;
        INT DATA_Column = cursor.getColumnIndex（MediaStore.Audio.Media.DATA）;
        INT TRACK_Column = cursor.getColumnIndex（MediaStore.Audio.Media.TITLE）;
        INT YEAR_Column = cursor.getColumnIndex（MediaStore.Audio.Media.YEAR）;
        INT DURATION_Column = cursor.getColumnIndex（MediaStore.Audio.Media.DURATION）;
        INT ALBUM_ID_Column = cursor.getColumnIndex（MediaStore.Audio.Media.ALBUM_ID）;
        INT ALBUM_Column = cursor.getColumnIndex（MediaStore.Audio.Media.ALBUM）;
        // INT ALBUM_KEY_Column = cursor.getColumnIndex（MediaStore.Audio.Media.ALBUM_KEY）;
        // INT TITLE_Column = cursor.getColumnIndex（MediaStore.Audio.Media.TITLE）;
        // INT TITLE_KEY_Column = cursor.getColumnIndex（MediaStore.Audio.Media.TITLE_KEY）;
        // INT ARTIST_ID_Column = cursor.getColumnIndex（MediaStore.Audio.Media.ARTIST_ID）;
        INT ARTIST_Column = cursor.getColumnIndex（MediaStore.Audio.Media.ARTIST）;        而（cursor.moveToNext（））
        {
            宋歌=新曲（）;
            song.setTrackId（cursor.getInt（_ID_Column））;
            song.setPathAudioFile（cursor.getString（DATA_Column））;
            song.setTrackName（cursor.getString（TRACK_Column））;
            song.setYearTrack（cursor.getInt（YEAR_Column））;
            song.setDuration（cursor.getString（DURATION_Column））;
            song.setAlbumId（cursor.getInt（ALBUM_ID_Column））;
            song.setAlbumName（cursor.getString（ALBUM_Column））;
            song.setArtist（cursor.getString（ARTIST_Column））;            songs.add（歌曲）;
        }        返回歌曲;
    }
 

解决方案

一个同样的问题，我一拳。如果删除 -

  MediaStore.Audio.Media.IS_MUSIC +！= 0
 

然后，它的工作原理。

In our app we want to get the music-files of one specific folder. We want to do this, to use the media store.

So we have a path /mnt/sd/music of this dir we will need all the files and not of the subdirs.

We tried to make a query with a substring, but it doesnt work.

public ArrayList<Song> getAudioFilesOfDir(String pathDirectory)
    {
        ArrayList<Song> songs = new ArrayList<Song>();

        //Some audio may be explicitly marked as not being music
        String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0 AND " + android.provider.MediaStore.Audio.Media.DATA.substring(pathDirectory.length()).contains("/") ;

        String[] projection = {
                MediaStore.Audio.Media._ID,
                MediaStore.Audio.Media.DATA,
                MediaStore.Audio.Media.TRACK,
                MediaStore.Audio.Media.YEAR,
                MediaStore.Audio.Media.DURATION,
                MediaStore.Audio.Media.ALBUM_ID,
                MediaStore.Audio.Media.ALBUM,
                MediaStore.Audio.Media.ALBUM_KEY,
                MediaStore.Audio.Media.TITLE,
                MediaStore.Audio.Media.TITLE_KEY,
                MediaStore.Audio.Media.ARTIST_ID,
                MediaStore.Audio.Media.ARTIST
        };

        ContentResolver cr = CoreLib.Context().getContentResolver();

        Cursor cursor = cr.query(
                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                projection,
                selection,
                null,
                MediaStore.Audio.Media._ID);

        int _ID_Column = cursor.getColumnIndex(MediaStore.Audio.Media._ID);
        int DATA_Column = cursor.getColumnIndex(MediaStore.Audio.Media.DATA);
        int TRACK_Column = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
        int YEAR_Column = cursor.getColumnIndex(MediaStore.Audio.Media.YEAR);
        int DURATION_Column = cursor.getColumnIndex(MediaStore.Audio.Media.DURATION);
        int ALBUM_ID_Column = cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID);
        int ALBUM_Column = cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM);
        //int ALBUM_KEY_Column = cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_KEY);
        //int TITLE_Column = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
        //int TITLE_KEY_Column = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE_KEY);
        //int ARTIST_ID_Column = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST_ID);
        int ARTIST_Column = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);

        while(cursor.moveToNext())
        {
            Song song = new Song();
            song.setTrackId(cursor.getInt(_ID_Column));
            song.setPathAudioFile(cursor.getString(DATA_Column));
            song.setTrackName(cursor.getString(TRACK_Column));
            song.setYearTrack(cursor.getInt(YEAR_Column));
            song.setDuration(cursor.getString(DURATION_Column));
            song.setAlbumId(cursor.getInt(ALBUM_ID_Column));
            song.setAlbumName(cursor.getString(ALBUM_Column));
            song.setArtist(cursor.getString(ARTIST_Column));

            songs.add(song);
        }

        return songs;
    }

解决方案

A same problem punched me. If you delete -

MediaStore.Audio.Media.IS_MUSIC + " != 0

Then it works.

这篇关于获取一个目录的音乐文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！