if(sr!=null){

      String str=childlist.get(groupPosition).get(childPosition).getTitle();

      int indexOf = str.indexOf(sr);

      if(indexOf != -1){

       

       int end = indexOf+sr.length();

       SpannableStringBuilder builder = new SpannableStringBuilder(str );

       ForegroundColorSpan redSpan = new ForegroundColorSpan(Color.RED);

       builder.setSpan(redSpan, indexOf, end, Spannable.SPAN_EXCLUSIVE_INCLUSIVE); 

       itemtitle.setText(builder);

      }