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private void checkVersion() {
      new Thread(){
         @Override
         public void run() {
            super.run();

            long startTime = System.currentTimeMillis();
            try {
               String urlstr="http://ver.php?d=wificfgapp&v="+ApkUtil.getVersionCode(MainActivity.this);
               URL url = new URL(urlstr);
               //开启一个连接
               HttpURLConnection connection = (HttpURLConnection) url.openConnection();

               connection.setConnectTimeout(8000);
               connection.setReadTimeout(8000);
               connection.setRequestMethod("GET");
               if(connection.getResponseCode()==200){

                  Log.d("AA",urlstr);
                  InputStream is = connection.getInputStream();
                   InputStreamReader isReader = new InputStreamReader(is);

                   /*
                   BufferedReader bufferedReader = new BufferedReader(isReader);
                  StringBuffer strBuffer = new StringBuffer();
                  String line = null;
                  while (null!=(line = bufferedReader.readLine()))  {
                     strBuffer.append(line);
                  }

                  String result = strBuffer.toString();
                  Log.d("AA",result);
*/
                  JSONParser jsonParser = new JSONParser();
                  JSONObject jsonObject = (JSONObject)jsonParser.parse(isReader);
                  StringWriter out = new StringWriter();
                  jsonObject.writeJSONString(out);
                  Log.d("AA",out.toString());

                  VersionInfo ver= new VersionInfo();
                  ver.versionName = (String) jsonObject.get("versionName");
                  ver.desc = (String) jsonObject.get("desc");
                  Number num = (Long) jsonObject.get("versionCode");
                  ver.versionCode = num.intValue();
                  ver.apkUrl = (String) jsonObject.get("apkUrl");
                  ver.apkSize = (String) jsonObject.get("apkSize");

                  if(jsonObject.containsKey("md5"))
                  {
                     ver.md5 = (String) jsonObject.get("md5");
                  }



                  if(ver.versionCode>ApkUtil.getVersionCode(getApplicationContext()))
                  {
                     Message msg = Message.obtain();
                     msg.what =200;
                     msg.obj = ver;
                     handler.sendMessage(msg);
                  }



               }
            } catch (IOException e) {
               e.printStackTrace();
            }catch (ParseException e) {
               e.printStackTrace();
            } finally {
               long endTime = System.currentTimeMillis();
               if(endTime-startTime<4000){
                  try {
                     Thread.sleep(4000-(endTime-startTime));
                  } catch (Exception e) {
                     e.printStackTrace();
                  }
               }

            }
         }
      }.start();
   }


   private class VersionInfo
   {

      public  String versionName;
      public int versionCode;
      public String apkUrl;
      public String desc;
      public String apkSize;
      public String md5;
      public int forceUpdate;


   }
   private void update(VersionInfo ver) {


      /*
       * 整个库允许配置的内容
       * 非必选
       */
      UpdateConfiguration configuration = new UpdateConfiguration()
            //输出错误日志
            .setEnableLog(true)
            //设置自定义的下载
            //.setHttpManager()
            //下载完成自动跳动安装页面
            .setJumpInstallPage(true)
            //设置对话框背景图片 (图片规范参照demo中的示例图)
            //.setDialogImage(R.drawable.ic_dialog)
            //设置按钮的颜色
            //.setDialogButtonColor(Color.parseColor("#E743DA"))
            //设置对话框强制更新时进度条和文字的颜色
            //.setDialogProgressBarColor(Color.parseColor("#E743DA"))
            //设置按钮的文字颜色
            .setDialogButtonTextColor(Color.WHITE)
            //设置是否显示通知栏进度
            .setShowNotification(true)
            //设置是否提示后台下载toast
            .setShowBgdToast(false)
            //设置强制更新
            .setForcedUpgrade(ver.forceUpdate>0?true:false);
            //设置对话框按钮的点击监听
            //.setButtonClickListener(this)
            //设置下载过程的监听
            //.setOnDownloadListener(listenerAdapter);

      boolean b = ApkUtil.deleteOldApk(this, getExternalCacheDir().getPath() + "/autoupdate.apk");

        DownloadManager manager;

      manager = DownloadManager.getInstance(this);
      manager.setApkName("autoupdate.apk")
            .setApkUrl(ver.apkUrl)
             .setSmallIcon(R.drawable.ic_launcher)
            .setShowNewerToast(true)
            .setConfiguration(configuration)
            .setApkVersionCode(ver.versionCode)
            .setApkVersionName(ver.versionName)
            .setApkSize(ver.apkSize)
            .setApkDescription(ver.desc)
//                .setApkMD5("DC501F04BBAA458C9DC33008EFED5E7F")
            .download();
   }

 implementation 'com.azhon:appupdate:3.0.2'

   compile files('libs/json-simple-1.1.1.jar')

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