private void GainTime() {
    new Thread(new Runnable() {
        @Override
        public void run() {
         try {
             URL url=new URL("http://www.taobao.com");
             URLConnection uc=url.openConnection();
             uc.connect();
             long id=uc.getDate();
            Date date=new Date(id);
             SimpleDateFormat formats=new SimpleDateFormat("网络时间："+"HH：mm：ss", Locale.CHINA);
            nowTime = formats.format(date);
             Log.i("时间", date.getHours() + "时" + date.getMinutes() + "分"
                     + date.getSeconds() + "秒" + "\n" + nowTime);

          }catch (Exception e){
             e.printStackTrace();
         }
            handler.sendEmptyMessage(0);
        }

    }).start();

    handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

            time_texts.setText(nowTime);
            if (nowTime==null||nowTime.equals("")){
                SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
                time_texts.setText(sdf.format(new Date()) + "(" + "系统时间" + ")");
            }
        }

    };


}
public void onClick(View view){
    GainTime();
}

获取网络时间失败，求大神指点