title: Android: Accessing UI Element from timer thread
body: <pre><code>public Button stb;
  static int cnt=0;
  public ArrayList&lt;RadioButton&gt; Butgrp1 = new ArrayList&lt;RadioButton&gt;();
  Timer myt; 
  TimerTask t;
  stb.setOnClickListener(new OnClickListener() {
  
  public void onClick(View v) {
  
  myt.mschedule(new TimerTask() {
  
      @Override
      public void run() {
  
          // TODO Auto-generated method stub
  
  
          System.out.println("Entering run");
          Handler h=new Handler();
  
          h.post(new Runnable() {
  
              public void run() {
  
                  // TODO Auto-generated method stub
                  runOnUiThread(new Runnable() {
  
                      public void run() {
                          // TODO Auto-generated method stub
                          Butgrp1.get(cnt).setChecked(true);
                          cnt=cnt+1;
                          if(cnt&gt;4)
                              cnt=0;
                          if(cnt&gt;0)
                          //  Butgrp1.get(cnt-1).setChecked(false);
                          System.out.println(cnt);
                      }
                  });
  
  
              }
          });
  
          //rg.getChildAt(cnt).setPressed(true);
  
      }
  },1000,2000);
  </code></pre>
  
  <p>I need to access a group of radio buttons on the ui and set it as checked at regular intervals, but i keep getting different errors, i realized i must use a handler, but its still not working...can anyone please tell me where i am going wrong....am a newbie and am trying out stuff to understand the working better...please help...</p>