private String ReadCPUinfo()
 {
  ProcessBuilder cmd;
  String result="";

  try{
   String[] args = {"/system/bin/cat", "/proc/cpuinfo"};
   cmd = new ProcessBuilder(args);

   Process process = cmd.start();
   InputStream in = process.getInputStream();
   byte[] re = new byte[1024];
   while(in.read(re) != -1){
    System.out.println(new String(re));
    result = result + new String(re);
   }
   in.close();
  } catch(IOException ex){
   ex.printStackTrace();
  }
  return result;
 }

device.setText(Html.fromHtml(
"CPU Speed: "  + readUsage() * 100
));

Timer timer = new Timer();
MyTimerTask myTimerTask = new MyTimerTask();

timer.schedule(myTimerTask, 0, 1000); // 0 Delay, Repeat after 1 second

class MyTimerTask extends TimerTask
{
    public void run()
    {
        runOnUiThread(new Runnable()
        {
            @Override
            public void run()
            {
                device.setText(Html.fromHtml("CPU Speed: " + readUsage() * 100));
            }
        }
    }
}

device.postDelayed(new Runnable()
{
    @Override
    public void run()
    {
        device.setText(Html.fromHtml("CPU Speed: " + readUsage() * 100));
    }
}, 1000);