取得外掛字幕 srt 的內容

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.R.integer;
import android.content.Context;
import android.util.Log;

/**
 * class for read and parse srt subtitle
 * 
 * This class is used to read and parse srt subtitle 
 * 
 */
public class VNSubtitleSRT {
 private static Matcher srtMatcher = null;
 
 public VNSubtitleSRT() {
  // do something
 }
 // --------- read srt file contents ----------
 /**
  * get subtitle srt file contents
  * @param filename SRT filename
  * @return SRT file contents
  */
 public static String getSRTContents(String filename) {
  StringBuilder text = new StringBuilder();
  try{
      //Get the text file
   BufferedReader br = new BufferedReader(new FileReader(filename));
         String line;
         while ((line = br.readLine()) != null) {
          text.append(line);
          text.append("\r\n");
         }
         br.close();
   return text.toString();
     }catch(Exception e){
         e.printStackTrace();
     }
  return "";
 }
 // --------- parse srt contents ---------------
 /**
  * parse srt file contents to ArrayList
  * @param contents srt file contents
  * @return false:parse error, true:parse correct
  */
 public static boolean parseSRTContents(String contents) {
  String pat = "(\\d+)\r\n(\\d{2}\\:\\d{2}\\:\\d{2},\\d{3}) --\\> (\\d{2}\\:\\d{2}\\:\\d{2},\\d{3})\r\n([\\s\\S]*?\r\n\r\n)";
  Pattern p = Pattern.compile(pat);
  srtMatcher = p.matcher(contents);
  if (srtMatcher.find(0)){
   return true;
  }
  return false;
 }
 // --------- get subtilte from CurrentPosition -------------
 public static String getSubtitle(int currentPosition){
  String sequence = "";
  int start = 0;
  int end = 0;
  String text = "";
  if (null == srtMatcher){
   return "";
  }
  if (!srtMatcher.find(0)){
   return "not find matcher";
  }
  while(srtMatcher.find()){
   sequence = srtMatcher.group(1);
   start = timeToInt(srtMatcher.group(2));
   end = timeToInt(srtMatcher.group(3));
   text = srtMatcher.group(4);
   if (currentPosition > start && currentPosition < end){
    return text;
   }
  }
  return "";
 }
 // --------- time to int ------------
 private static int timeToInt(String ctime){
  int hours = Integer.valueOf(ctime.substring(0, 2));
  int mins =  Integer.valueOf(ctime.substring(3, 5));
  int secs =  Integer.valueOf(ctime.substring(6, 8));
  int msec =  Integer.valueOf(ctime.substring(9, 12));
  
  return (hours*60*60 + mins*60 + secs)*1000 + msec;
 }
}