@Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        //实例化 MyHandler类
        myHandler=new MyHandler();
        if(ACTION_START.equals(intent.getAction())){        
            FileInfo fileInfo=(FileInfo)intent.getSerializableExtra("fileInfo");
            //启动初始化线程
            Log.d("huefew","正常");
            new InitThread(fileInfo).start();
        }else if(ACTION_STOP.equals(intent.getAction())){
            FileInfo fileInfo=(FileInfo)intent.getSerializableExtra("fileInfo");
            if(mTask!=null){
                mTask.isPause=true;
            }
        }
        return super.onStartCommand(intent, flags, startId);
    }
    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
    }    
   
    /*
     * 初始化子线程
     */
    class InitThread extends Thread{
        private FileInfo mFileInfo=null;
        public InitThread(FileInfo mfileInfo){
            this.mFileInfo=mfileInfo;
        }
        public void run() {
            HttpURLConnection conn=null;
            RandomAccessFile raf=null;
            try{
               //链接网络文件
                URL url=new URL(mFileInfo.geturl());
                 conn=(HttpURLConnection)url.openConnection();
                 conn.setConnectTimeout(5000);
                 conn.setRequestMethod("GET");
                int length=-1;
                if(conn.getResponseCode()==206){
                   //获得文件长度
                    length=conn.getContentLength();
                }
                if(length<=0){
                    return;
                }
                //在本地创建文件
                File dir=new File(SAVE_PATH);
                if(!dir.exists()){
                    dir.mkdir();
                }
                File file=new File(dir,mFileInfo.getfileName());
                raf=new RandomAccessFile(file,"rwd");
                raf.setLength(length);
                
                //设置文件长度,用MyHandler的对象传递Message到被继承的Handler方法中
                mFileInfo.setlength(length);
                Message message=Message.obtain();
                 message.what=MSG_INIT;
                 message.obj=mFileInfo;
                 myHandler.sendMessage(message);
            }catch(Exception e){
                e.printStackTrace();
            }finally{
                try {
                    raf.close();
                    conn.disconnect();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }