chat application in android so that sender and receiver message should be on different side

 protected void onPostExecute( ArrayList<HashMap<String,String>> myArrayList)//    for arraylist(ArrayList<String> result)
   {                            

       for (HashMap<String, String> data : myArrayList)
      {
           String sender_no = data.get(TAG_SENDER_NO);
           String msg1=data.get(TAG_SEN_MSG);
           String receiver_no=data.get(TAG_RECEIVER_NO);

           if(sender_no.equals(senderno))
           {

           ListAdapter adapter = new SimpleAdapter(SinglechatActivity.this, myArrayList,R.layout.list_row_layout_even, 
           new String[] { TAG_SEN_MSG },new int[] { R.id.message_me });

        //  CustomList adapter= new CustomList(SinglechatActivity.this,myArrayList);//sender_no,  msg1,   receiver_no);

         ListView  lv = (ListView) findViewById(R.id.listview);
           lv.setAdapter( adapter);

          }

           else

           {
               ListAdapter adapter = new SimpleAdapter(SinglechatActivity.this, myArrayList,R.layout.list_row_layout_odd, 
                       new String[] { TAG_SEN_MSG },new int[] { R.id.message_frnd });

                //  CustomList adapter= new CustomList(SinglechatActivity.this,  sender_no,  msg1,   receiver_no);

                 ListView  lv = (ListView) findViewById(R.id.listview);
                   lv.setAdapter( adapter);

           }

In this, I would like to have message on right hand side and left hand side based on the sender and receiver.