音乐播放器的乱码问题！！

ContentResolver cr = c.getContentResolver();

		Cursor cursor = cr.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,

				null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);



		if (cursor != null && cursor.getCount() > 0) {



			for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor

					.moveToNext()) {



				long id = cursor.getLong(cursor

						.getColumnIndex(MediaStore.Audio.Media._ID));

				// 歌曲名

				String title = cursor.getString(cursor

						.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));



				// 歌手名

				String singer = cursor.getString(cursor

						.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));

				// 歌曲长度

				int time = cursor

						.getInt(cursor

								.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));

				// 歌曲文件名字

				String name = cursor

						.getString(cursor

								.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME));



				String suffix = name

						.substring(name.length() - 4, name.length());

				// 歌曲文件的全路径

			    String url = cursor.getString(cursor

						.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));

			    

					

						File file = new File(url);

						BufferedReader reader;				

						FileInputStream fis;

							try {

								fis = new FileInputStream(file);

								BufferedInputStream in = new BufferedInputStream(fis);

								in.mark(4);

								byte[] first3bytes = new byte[3];

								in.read(first3bytes);

								in.reset();

								

								if (first3bytes[0] == (byte) 0xEF

										&& first3bytes[1] == (byte) 0xBB

										&& first3bytes[2] == (byte) 0xBF) {

									charset = "utf-8";

									

								} else if (first3bytes[0] == (byte) 0xFF



								&& first3bytes[1] == (byte) 0xFE) {

									charset = "unicode";

									Toast.makeText(c, charset, 1).show();

								} else if (first3bytes[0] == (byte) 0xFE



								&& first3bytes[1] == (byte) 0xFF) {

									charset = "utf-16be";

								} else if (first3bytes[0] == (byte) 0xFF



								&& first3bytes[1] == (byte) 0xFF) {

									charset = "utf-16le";

								} else {

									charset = "GBK";

								}

				   

							} catch (FileNotFoundException e1) {

								// TODO Auto-generated catch block

								e1.printStackTrace();

							} catch (IOException e) {

								// TODO Auto-generated catch block

								e.printStackTrace();

							}

							

				// 专辑名

				String album = cursor.getString(cursor

						.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM));

				try {

										

					singer = new String(singer.getBytes(), charset);

					title = new String(title.getBytes(), charset);

					album = new String(album.getBytes(), charset);

				} catch (UnsupportedEncodingException e) {

					// TODO Auto-generated catch block

					e.printStackTrace();

				}

				long albumid = cursor.getLong(cursor

						.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));



				if (url.endsWith(".mp3") || url.endsWith(".MP3")) {

					Map<String, Object> map = new HashMap<String, Object>();

					map.put("ID", id);

					map.put("TITLE", title);

					map.put("SINGER", singer);

					map.put("TIME", time);

					map.put("NAME", name);

					map.put("SUFFIX", suffix);

					map.put("URL", url);

					map.put("ALBUM", album);

					map.put("ALBUMID", albumid);

					musicdata.add(map);

				}			

		}