android 音乐播放的歌词 编码判断及提取

编码判断 FileInputStream fis;

fis.getCharset();

getCharset方法代码如下:

public static String getCharset(File file) {
		String charset = "GBK";
		byte[] first3Bytes = new byte[3];
		try {
			boolean checked = false;
			BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
			bis.mark(0);
			int read = bis.read(first3Bytes, 0, 3);
			if (read == -1)
				return charset;
			if (first3Bytes[0] == (byte) 0xFF && first3Bytes[1] == (byte) 0xFE) {
				charset = "UTF-16LE";
				checked = true;
			} else if (first3Bytes[0] == (byte) 0xFE && first3Bytes[1] == (byte) 0xFF) {
				charset = "UTF-16BE";
				checked = true;
			} else if (first3Bytes[0] == (byte) 0xEF && first3Bytes[1] == (byte) 0xBB && first3Bytes[2] == (byte) 0xBF) {
				charset = "UTF-8";
				checked = true;
			}
			bis.reset();
			if (!checked) {
				int loc = 0;
				while ((read = bis.read()) != -1) {
					loc++;
					if (read >= 0xF0)
						break;
					if (0x80 <= read && read <= 0xBF)
						break;
					if (0xC0 <= read && read <= 0xDF) {
						read = bis.read();
						if (0x80 <= read && read <= 0xBF)
							continue;
						else
							break;
					} else if (0xE0 <= read && read <= 0xEF) {
						read = bis.read();
						if (0x80 <= read && read <= 0xBF) {
							read = bis.read();
							if (0x80 <= read && read <= 0xBF) {
								charset = "UTF-8";
								break;
							} else
								break;
						} else
							break;
					}
				}
			}
			bis.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return charset;
	}

将lrc文件按行读取，每一行处理函数如下：

private static String analyzeLRC(String text) {
		try {
			int pos1 = text.indexOf("[");
			int pos2 = text.indexOf("]");

			if (pos1 >= 0 && pos2 != -1) {
				Long time[] = new Long[getPossiblyTagCount(text)];
				time[0] = timeToLong(text.substring(pos1 + 1, pos2));
				if (time[0] == -1)
					return "";
				String strLineRemaining = text;
				int i = 1;
				while (pos1 >= 0 && pos2 != -1) {

					strLineRemaining = strLineRemaining.substring(pos2 + 1);
					pos1 = strLineRemaining.indexOf("[");
					pos2 = strLineRemaining.indexOf("]");
					if (pos2 != -1) {
						time[i] = timeToLong(strLineRemaining.substring(pos1 + 1, pos2));
						if (time[i] == -1)
							return ""; // LRCText
						i++;
					}
				}

				Lyrc tl = null;
				for (int j = 0; j < time.length; j++) {
					if (time[j] != null) {
						tl = new Lyrc();
						tl.timePoint = time[j].intValue();
						tl.lrcString = strLineRemaining;
						lyrcList.add(tl);
					}
				}
				return strLineRemaining;
			} else
				return "";
		} catch (Exception e) {
			return "";
		}
	}

其中 timeToLong方法是将lrc文件中“[”与“]”之间的时间读取出来，方法如下：

public static long timeToLong(String Time) {
		try {
			String[] s1 = Time.split(":");
			int min = Integer.parseInt(s1[0]);
			String[] s2 = s1[1].split("\\.");
			int sec = Integer.parseInt(s2[0]);
			int mill = 0;
			if (s2.length > 1)
				mill = Integer.parseInt(s2[1]);
			return min * 60 * 1000 + sec * 1000 + mill * 10;
		} catch (Exception e) {
			return -1;
		}
	}