Android音乐播放器 歌词乱码

在开发安卓音乐播放器时，歌词显示总会遇到中文显示乱码的问题；

发现是很多时候是由于，不同网站上下载的歌词可能编码格式不同，而我在解析歌词的时候统一都用的一种编码格式；
这样就很有可能造成编码格式不匹配，从而导致解析出来的String就是乱码；

为了避免这种问题，我们可以在读取歌词时，先用BufferedInputStream读取歌词前三个字节；
据此判断歌词的编码格式，然后在再用BufferedReader读取对应编码格式的歌词；
从而有效避免了歌词乱码的问题

代码如下：

   public void init(File file) {
        BufferedReader reader = null;
        WeakReference<StringBuilder> weakSb;
        WeakReference<BufferedReader> weakBr = null;
        StringBuilder sb;
        FileInputStream fis;
        BufferedInputStream bis;
        try {
            if (null == file)
                return;
            fis = new FileInputStream(file);
            bis = new BufferedInputStream(fis);
            bis.mark(4);
            byte[] first3bytes = new byte[3];
            bis.read(first3bytes);
            bis.reset();
            /**
             * add by libeibei
             * 动态识别歌词编码格式
             * 防止出现乱码问题
             * 2018-01-04
             */
            if (first3bytes[0] == (byte) 0xEF && first3bytes[1] == (byte) 0xBB
                    && first3bytes[2] == (byte) 0xBF) {// utf-8
                Log.e("MusicPlayer","Lyric text type = utf-8");
                reader = new BufferedReader(new InputStreamReader(bis, "utf-8"));

            } else if (first3bytes[0] == (byte) 0xFF
                    && first3bytes[1] == (byte) 0xFE) {
                Log.e("MusicPlayer","Lyric text type = utf-unicode");
                reader = new BufferedReader(
                        new InputStreamReader(bis, "unicode"));
            } else if (first3bytes[0] == (byte) 0xFE
                    && first3bytes[1] == (byte) 0xFF) {
                Log.e("MusicPlayer","Lyric text type = utf-16be");
                reader = new BufferedReader(new InputStreamReader(bis,
                        "utf-16be"));
            } else if (first3bytes[0] == (byte) 0xFF
                    && first3bytes[1] == (byte) 0xFF) {
                Log.e("MusicPlayer","Lyric text type = utf-16le");
                reader = new BufferedReader(new InputStreamReader(bis,
                        "utf-16le"));
            } else {
                Log.e("MusicPlayer","Lyric text type = GBK");
                reader = new BufferedReader(new InputStreamReader(bis, "GBK"));
            }
            weakBr = new WeakReference<BufferedReader>(reader);
            sb = new StringBuilder();
            weakSb = new WeakReference<StringBuilder>(sb);
            String temp = null;
            WeakReference<String> weakTemp = new WeakReference<String>(temp);
            while ((temp = weakBr.get().readLine()) != null) {

                weakSb.get().append(temp).append("\n");
            }
            init(weakSb.get().toString());
            sb = null;
            weakSb = null;
            System.gc();
        } catch (Exception ex) {
            Logger.getLogger(Lyric.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            try {
                if (null == reader)
                    return;
                reader.close();
                weakSb = null;
                weakBr.get().close();
                System.gc();
            } catch (Exception ex) {
                Logger.getLogger(Lyric.class.getName()).log(Level.SEVERE, null,
                        ex);
            }
        }
    }