PC版与Android手机版带断点续传的多线程下载

 public class MultiDownload {
    static int ThreadCount = ;
    static int finishedThread = ;
    //确定下载地址
    static String filename = "EditPlus.exe";
    static String path = "http://...:/"+filename;
    public static void main(String[] args) {
      //、发送get请求，去获得下载文件的长度
     try {
       URL url = new URL(path);
       HttpURLConnection cOnn= (HttpURLConnection) url.openConnection();
       conn.setRequestMethod("GET");
       conn.setConnectTimeout();
       conn.setReadTimeout();
       if (conn.getResponseCode()==) {
         //如果请求成功，拿到所请求资源文件的长度
         int length = conn.getContentLength();
         //、生成一个与原文件同样的大小的临时文件，以免下载一半存储空间不够了
         File file = new File(filename);//演示，所以将保存的文件目录放在工程的同目录
         //使用RandomAccessFile 生成临时文件，可以用指针定位文件的任意位置，
         //而且能够实时写到硬件底层设备，略过缓存，这对下载文件是突然断电等意外是有好处的
         RandomAccessFile raf = new RandomAccessFile(file, "rwd");//rwd, 实时写到底层设备
         //设置临时文件的大小
         raf.setLength(length);
         raf.close();
         //、计算出每个线程应该下载多少个字节
         int size = length/ThreadCount;//如果有余数，负责最后一部分的线程负责下砸
         //开启多线程
         for (int threadId = ; threadId 

public class MainActivity extends Activity {
  static int ThreadCount = ;
  static int FinishedThread = ;
  int currentProgess;
  static String Filename = "QQPlayer.exe";
  static String Path = "http://...:/"+Filename;
  static MainActivity ma;
  static ProgressBar pb;
  static TextView tv;
  static Handler handler = new Handler(){
    public void handleMessage(android.os.Message msg){
      tv.setText((long)pb.getProgress()* /pb.getMax() +"%");
    };
  };
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ma = this;
    pb = (ProgressBar) findViewById(R.id.pb);
    tv = (TextView) findViewById(R.id.tv);
  }
  public void download(View v){
    Thread t = new Thread(){
      public void run() {
        //发送http请求获取文件的长度，创建临时文件
        try {
          URL url= new URL(Path);
          HttpURLConnection cOnn= (HttpURLConnection) url.openConnection();
          conn.setRequestMethod("GET");
          conn.setConnectTimeout();
          conn.setReadTimeout();
          if (conn.getResponseCode()==) {
            int length = conn.getContentLength();
            //设置进度条的最大值就是原文件的总长度
            pb.setMax(length);
            //生成一个与原文件相同大小的临时文件
            File file = new File(Environment.getExternalStorageDirectory(),Filename);
            RandomAccessFile raf = new RandomAccessFile(file, "rwd");
            raf.setLength(length);
            raf.close();
            //计算每个线程需要下载的数据大小
            int size = length/ThreadCount;
            //开启多线程
            for (int threadId = ; threadId