如何从 android 中的私人文件夹路径获取音频文件

Question

我正在尝试从 私人文件夹 中检索音乐播放器的音频文件。

下面是我的代码-

    public ArrayList<MusicFiles> getAllAudio(Context context){
    SharedPreferences preferences = getSharedPreferences(MY_SORT_PREF, MODE_PRIVATE);
    String sortOrder = preferences.getString("sorting", "sortByName");
    ArrayList<String> duplicate = new ArrayList<>();
    albums.clear();
    ArrayList<MusicFiles> tempAudioList = new ArrayList<>();
    String order = null;
    Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    switch (sortOrder){
        case "sortByName":
            order = MediaStore.MediaColumns.DISPLAY_NAME + " ASC";
            break;
        case "sortByDate":
            order = MediaStore.MediaColumns.DATE_ADDED + " ASC";
            break;
        case "sortBySize":
            order = MediaStore.MediaColumns.SIZE + " DESC";
            break;
    }
    String[] projection = {
            MediaStore.Audio.Media.ALBUM,
            MediaStore.Audio.Media.TITLE,
            MediaStore.Audio.Media.DURATION,
            MediaStore.Audio.Media.DATA,
            MediaStore.Audio.Media.ARTIST,
            MediaStore.Audio.Media._ID
    };
    String folder = getApplicationContext().getDir("Songs", MODE_PRIVATE).getAbsolutePath();
    String selection = MediaStore.Audio.Media.DATA + " LIKE ? AND " + MediaStore.Audio.Media.DATA + " NOT LIKE ? ";
    String[] selectionArgs = new String[]{
            "%" + folder + "%",
            "%" + folder + "/%/%"
    };

    Cursor cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, order);
    if(cursor != null){
        while(cursor.moveToNext()){
            String album = cursor.getString(0);
            String title = cursor.getString(1);
            String duration = cursor.getString(2);
            String path = cursor.getString(3);
            String artist = cursor.getString(4);
            String id = cursor.getString(5);
            MusicFiles musicFiles = new MusicFiles(path, title, artist, album, duration, id);
            //for checking
            Log.e("Path: " + path, "Album : " + album);
            tempAudioList.add(musicFiles);
            if(!duplicate.contains(album)){
                albums.add(musicFiles);
                duplicate.add(album);
            }
        }
        cursor.close();
    }
    return tempAudioList;
}

Answer 1

MediaStore 无权访问 internal storage 应用程序，因此 MediaStore 不会将它们编入索引。

您可以使用普通文件系统 API（例如 File 上的 listFiles()）来处理内部存储。

请注意，上面的代码片段中不需要 getApplicationContext()。

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