title: reset my checked radiogroup when the radiogroup is used again in the same activity
body: <p>I am making a quiz application...I am accessing the questions through "id"...every time a question is answered(any radio button is checked),the id is incremented and doInBackground() function is called to load the next question....But when the next question is loaded i want my radiogroup be completely refreshed(no radio checked,original white color text) ... how to do that????</p>
  
  <p>here is my activity....</p>
  
  <pre><code> public class JsonDemo extends Activity 
   {
  JSONObject json;
  HttpClient client;
  TextView q_desc,c_or_w,id_check;
  RadioButton rb_a,rb_b,rb_c,rb_d;
  RadioGroup rg;
  String ans;
  int id=1;
  int score=0;
  
  
  
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  
      // TODO Auto-generated method stub
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.result_json);
  
      q_desc=(TextView)findViewById(R.id.q_desc);
      c_or_w=(TextView)findViewById(R.id.corr_incorrect);
      id_check=(TextView)findViewById(R.id.id_check);
      rg=(RadioGroup)findViewById(R.id.rg_option);
      rb_a=(RadioButton)findViewById(R.id.opt_a);
      rb_b=(RadioButton)findViewById(R.id.opt_b);
      rb_c=(RadioButton)findViewById(R.id.opt_c);
      rb_d=(RadioButton)findViewById(R.id.opt_d);
  
      client=new DefaultHttpClient();
  
  
      new Read().execute(Integer.toString(id));
  
  }
   public  JSONObject getData(String id)throws     ClientProtocolException,IOException,JSONException
     {
       String url = "http://10.0.2.2:7001/proj/json.jsp";
       HttpPost post = new HttpPost(url);
       List&lt;NameValuePair&gt; pairs = new ArrayList&lt;NameValuePair&gt;();
       pairs.add(new BasicNameValuePair("id",id));
       post.setEntity(new UrlEncodedFormEntity(pairs));
  
      HttpResponse r=client.execute(post);
      int status=r.getStatusLine().getStatusCode();
  
      if(status == 200)
      {
          HttpEntity e=r.getEntity();
          String data=EntityUtils.toString(e);
          JSONObject last=new JSONObject(data);
          return last;
  
  
      }
      else
      {
          Toast.makeText(JsonDemo.this, "error", Toast.LENGTH_SHORT);
          return null;
      }
  
  }
  
  
  
   public class Read extends AsyncTask&lt;String,Integer,JSONObject&gt; implements     OnCheckedChangeListener
  {
  ProgressDialog dialog = ProgressDialog.show(JsonDemo.this, "", "Loading Question,   Please wait...");
  
  @Override
  protected void onPreExecute() {
  
  
      dialog.show();
  
  }
  
  @Override
  protected void onProgressUpdate(Integer... values) {
      // TODO Auto-generated method stub
      rg.clearCheck();
  }
  
  @Override
  protected void onPostExecute(JSONObject result) {
      // TODO Auto-generated method stub
      try {
          String desc=json.getString("desc");
          String option_a=json.getString("a");
          String option_b=json.getString("b");
          String option_c=json.getString("c");
          String option_d=json.getString("d");
          ans=json.getString("ans");
          q_desc.setText(desc);
          rb_a.setText(option_a);
          rb_b.setText(option_b);
          rb_c.setText(option_c);
          rb_d.setText(option_d);
          rg.clearFocus();
          if(dialog!=null)
          {
              dialog.dismiss();
          }
  
  
          rg.setOnCheckedChangeListener(this);
  
      } catch (JSONException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
      }
   }
  
   @Override
   protected JSONObject doInBackground(String... params) {
      try {
          json=getData(params[0]);
          return json;
      } catch (ClientProtocolException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
      } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
      } catch (JSONException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
      }
      return null;
   }
  
   public void onCheckedChanged(RadioGroup rg, int checkedId) {
  
      switch(checkedId)
      {
      case R.id.opt_a:
      {
          if(ans.equalsIgnoreCase("a"))
          {
  
              id=id+1;
              c_or_w.setText("Correct");
              id_check.setText(Integer.toString(id)); 
              rb_a.setTextColor(Color.parseColor("#33ff99"));
              if(id&gt;10)
              {
  
              }
              else{
                  score=score+1;
              new Read().execute(Integer.toString(id));
              }
          }
          else
          {
              id=id+1;
              c_or_w.setText("InCorrect");
              id_check.setText(Integer.toString(id));
              if(id&gt;10)
              {
  
              }
              else{
              new Read().execute(Integer.toString(id));
              }
  
          }
          break;
  
      }
      case R.id.opt_b:
      {
          if(ans.equalsIgnoreCase("b"))
          {
  
              id=id+1;
              c_or_w.setText("Correct");
              id_check.setText(Integer.toString(id));
              rb_b.setTextColor(R.color.green);
              if(id&gt;10)
              {
  
              }
              else{
                  score=score+1;
              new Read().execute(Integer.toString(id));
              }   
          }
          else
          {
              id=id+1;
              c_or_w.setText("InCorrect");
              id_check.setText(Integer.toString(id));
              if(id&gt;10)
              {
  
              }
              else{
  
              new Read().execute(Integer.toString(id));
              }   
              }
          break;
      }
      case R.id.opt_c:
      {
          if(ans.equalsIgnoreCase("c"))
          {
  
              id=id+1;
              rb_a.setTextColor(666);
              c_or_w.setText("Correct");
              id_check.setText(Integer.toString(id));         
              if(id&gt;10)
              {
  
              }
              else{
                  score=score+1;
              new Read().execute(Integer.toString(id));
              }
          }
          else
          {
              id=id+1;
              c_or_w.setText("InCorrect");
              id_check.setText(Integer.toString(id));
              if(id&gt;10)
              {
  
              }
              else{
              new Read().execute(Integer.toString(id));
              }
  
          }
          break;
      }
      case R.id.opt_d:
      {
          if(ans.equalsIgnoreCase("d"))
          {
  
              id=id+1;
              c_or_w.setText("Correct");
              id_check.setText(Integer.toString(id)); 
              if(id&gt;10)
              {
  
              }
              else{
                  score=score+1;
              new Read().execute(Integer.toString(id));
              }
          }
          else
          {
              id=id+1;
              c_or_w.setText("InCorrect");
              id_check.setText(Integer.toString(id));
              if(id&gt;10)
              {
  
              }
              else{
  
              new Read().execute(Integer.toString(id));
              }
  
          }
          break;
      }
  
      }
  
  }
  
  
  }
  
  }
  </code></pre>