Question

我想从设备上的一个特定路径获取所有歌曲。在一个例子中，我想从一个特定的文件夹中获取所有歌曲＆＃34;音乐＆＃34;来自路径：＆＃34; / mnt / sdcard / music /＆＃34; ，我需要在我的代码中更改才能实现此目的？我有这种方法可以从设备中获取所有歌曲：

public ArrayList<Song> scanAllSongsOnDevice(Context c)
    {
        ContentResolver musicResolver = c.getContentResolver();
        Uri musicUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        String col[] ={android.provider.MediaStore.Audio.Media._ID};
Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);


        if (musicCursor != null && musicCursor.moveToFirst())
        {
            // clear  list to prevent duplicates
            songsList = new ArrayList<>();

            //get columns
            int titleColumn = musicCursor.getColumnIndex
                    (android.provider.MediaStore.Audio.Media.TITLE);
            int idColumn = musicCursor.getColumnIndex
                    (android.provider.MediaStore.Audio.Media._ID);
            int artistColumn = musicCursor.getColumnIndex
                    (android.provider.MediaStore.Audio.Media.ARTIST);
            int isMusicColumn = musicCursor.getColumnIndex
                    (MediaStore.Audio.Media.IS_MUSIC);
            int duration = musicCursor.getColumnIndex
                    (MediaStore.Audio.Media.DURATION);

            //add songs to list
            do
            {
                String filePath = musicCursor.getString(musicCursor.getColumnIndex(MediaStore.Audio.Media.DATA));
                // check if the file is a music and the type is supported
                if (musicCursor.getInt(isMusicColumn) != 0 && filePath != null && (FileExtensionFilter.checkValidExtension(filePath)) && musicCursor.getInt(duration) > 0)
                {
                    int thisId = musicCursor.getInt(idColumn);
                    String thisTitle = musicCursor.getString(titleColumn);
                    String thisArtist = musicCursor.getString(artistColumn);
                    Song song = new Song();
                    song.setId(thisId);
                    if(!thisArtist.equals("<unknown>"))
                    {
                        song.setArtist(thisArtist);
                        song.setTitle(thisTitle);
                    }
                    else
                    {
                        song.setArtist("");
                        song.setTitle("");
                    }
                    song.setSongPath(filePath);
                    File file = new File(filePath);
                    song.setFileName(file.getName().substring(0, (file.getName().length() - 4)));
                    songsList.add(song);
                }
            }
            while (musicCursor.moveToNext());
        }
        else  // if we don't have any media in the folder that we selected set NO MEDIA
        {
            addNoSongs();
        }

        musicCursor.close();

        if(songsList.size() == 0)
        {
            addNoSongs();
        }

        Collections.sort(songsList, new Comparator<Song>()
        {
            @Override
            public int compare(Song song, Song song2)
            {
                int compare = song.getTitle().compareTo(song2.getTitle());
                return ((compare == 0) ? song.getArtist().compareTo(
                        song2.getArtist()) : compare);
            }
        });

        return songsList;
    }

Answer 1

您需要修改musicCursor之类的

musicCursor = musicResolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null,MediaStore.Audio.Media.DATA + " like ? ",
            new String[] {"%YOUR_SPECIFIC_FOLDER_NAME%"},  null);

希望它能帮到你......

由于

Answer 2

首先，您需要通过MediaScanner将您的歌曲数据添加到系统的媒体商店。

    String scanDir = null;
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
        scanDir = Environment.getExternalStorageDirectory().getAbsolutePath()
                + File.separator + "music";
    } else {
        // sdcard is not available
    }
    MediaScannerConnection.scanFile(getApplicationContext(), 
            new String[] { scanDir },
            new String[] { "audio/*" }, 
            new OnScanCompletedListener() {

                @Override
                public void onScanCompleted(String path, Uri uri) {
                }
            });

这将向框架发送广播意图，框架将扫描您指定的目录并将扫描结果添加到系统媒体商店数据库。

之后，您可以通过contentresolver访问数据，就像您粘贴的代码一样。

Answer 3

将您的filePath变量更改为：

String filePath = Environment.getExternalStorageDirectory() + "/music";

Answer 4

public ArrayList<File> findSong(File root) {

        ArrayList<File> al = new ArrayList<File>();
        File[] files = root.listFiles();    // All file and folder automatic collect

        for (File singleFile : files) {
            if (singleFile.isDirectory() && !singleFile.isHidden()) {
                al.addAll(findSong(singleFile)); //Recursively call
            } else {
                if (singleFile.getName().endsWith(".mp3")) {
                    al.add(singleFile);
                }
            }
        }
        return al;
    }

的onCreate：

final ArrayList<File> mySongs = findSong(Environment.getExternalStorageDirectory());

        items = new String[mySongs.size()];

        for (int i = 0; i < mySongs.size(); i++) {
            //  toast(mySongs.get(i).getName().toString());
            //  items[i] = mySongs.get(i).getName().toString();
            items[i] = mySongs.get(i).getName().toString().replace(".mp3", "");
        }

MediaStore列出特定路径中的所有歌曲

4 个答案: