android - json exception no value for f1 -


i have made android application , trying select data database table-row , textview.

but when trying handle json response ,getting error, here's code 

 public void selectfromdb(){            try{              httpclient httpclient = new defaulthttpclient();              httppost httppost = new httppost("http://xxxxxxxx/selectall.php");              httpresponse response = httpclient.execute(httppost);              httpentity entity = response.getentity();              = entity.getcontent();                log.e("log_tag", "connection success ");              //   toast.maketext(getapplicationcontext(), "pass", toast.length_short).show();          }          catch(exception e)          {              log.e("log_tag", "error in http connection "+e.tostring());              toast.maketext(getactivity(), "connection fail", toast.length_short).show();            }          //convert response string          try          {              bufferedreader reader = new bufferedreader(new inputstreamreader(is,"iso-8859-1"),8);              stringbuilder sb = new stringbuilder();              string line = null;              while ((line = reader.readline()) != null)              {                  sb.append(line + "\n");                  //  toast.maketext(getapplicationcontext(), "input reading pass", toast.length_short).show();              }              is.close();                result=sb.tostring();          }          catch(exception e)          {              log.e("log_tag", "error converting result "+e.tostring());              toast.maketext(getactivity(), " input reading fail", toast.length_short).show();            }            //parse json data          try          {                jsonarray jarray = new jsonarray(result);                string re=jarray.getstring(jarray.length()-1);                tablelayout tv=(tablelayout)getview().findviewbyid(r.id.table);              tv.removeallviewsinlayout();                int flag=1;                for(int i=-1;i<jarray.length()-1;i++)                {                 tablerow tr=new tablerow(getactivity());                    tr.setlayoutparams(new layoutparams(                          layoutparams.fill_parent,                          layoutparams.wrap_content));                    if(flag==1)                  {                        textview b6=new textview(getactivity());                      b6.settext("id");                      b6.settextcolor(color.blue);                      b6.settextsize(15);                      tr.addview(b6);                        textview b19=new textview(getactivity());                      b19.setpadding(10, 0, 0, 0);                      b19.settextsize(15);                      b19.settext("matier");                      b19.settextcolor(color.blue);                      tr.addview(b19);                        tv.addview(tr);                        final view vline = new view(getactivity());                      vline.setlayoutparams(new tablerow.layoutparams(tablerow.layoutparams.fill_parent, 2));                      vline.setbackgroundcolor(color.blue);                        tv.addview(vline);                      flag=0;                    }else                  {                      jsonobject json_data = jarray.getjsonobject(i);                        log.i("log_tag","id: "+json_data.getint("f1")+                                      ", matier: "+json_data.getstring("f2")                      );                        textview b=new textview(getactivity());                //      string stime=string.valueof(json_data.getint("f1"));                      b.settext(json_data.optstring("f1"));                      b.settextcolor(color.red);                      b.settextsize(15);                      tr.addview(b);                        textview b1=new textview(getactivity());                      b1.setpadding(10, 0, 0, 0);                      b1.settextsize(15);                      string stime1=json_data.optstring("f2");                      b1.settext(stime1);                      b1.settextcolor(color.white);                      tr.addview(b1);                        tv.addview(tr);                        final view vline1 = new view(getactivity());                      vline1.setlayoutparams(new tablerow.layoutparams(tablerow.layoutparams.fill_parent, 1));                      vline1.setbackgroundcolor(color.white);                      tv.addview(vline1);                    }                }            }          catch(jsonexception e)          {              log.e("log_tag", "error parsing data "+e.tostring());              toast.maketext(getactivity(), e.tostring(), toast.length_short).show();          }        }        }

and code php 

    <?php             $con = mysql_connect("","","");           if (!$con)             {               die('could not connect: ' . mysql_error());             }               mysql_select_db("databas", $con);               $i=mysql_query("select * test",$con);               $num_rows = mysql_num_rows($i);             $check='';             while($row = mysql_fetch_array($i))               {                    $r[]=$row;                    $check=$row['f1'];               }                       if($check==null)             {                                $r[$num_rows]="record not available";                    echo json_encode($r);             }              else               {                  $r[$num_rows]="success";                   echo json_encode($r);               }      mysql_close($con);  ?>
error:

json exception no value 'f1'

ths out put of php file 

[{"0":"66","id":"66","1":"","matier":""},{"0":"65","id":"65","1":"","matier":""},{"0":"64","id":"64","1":"","matier":""},{"0":"63","id":"63","1":"","matier":""},{"0":"62","id":"62","1":"","matier":""},{"0":"61","id":"61","1":"","matier":""},{"0":"60","id":"60","1":"","matier":""},{"0":"59","id":"59","1":"","matier":""},{"0":"58","id":"58","1":"","matier":""},{"0":"57","id":"57","1":"","matier":""},{"0":"56","id":"56","1":"","matier":""},{"0":"55","id":"55","1":"","matier":""},{"0":"54","id":"54","1":"test","matier":"test"},{"0":"53","id":"53","1":"jfhhf","matier":"jfhhf"},{"0":"52","id":"52","1":"jfhhf","matier":"jfhhf"},{"0":"42","id":"42","1":"ykk","matier":"ykk"},{"0":"51","id":"51","1":"jfhhf","matier":"jfhhf"},{"0":"50","id":"50","1":"jfhhf","matier":"jfhhf"},{"0":"49","id":"49","1":"opp","matier":"opp"},{"0":"48","id":"48","1":"opp","matier":"opp"},{"0":"47","id":"47","1":"opp","matier":"opp"},{"0":"46","id":"46","1":"opp","matier":"opp"},{"0":"45","id":"45","1":"opp","matier":"opp"},{"0":"44","id":"44","1":"ykfvjf","matier":"ykfvjf"},{"0":"43","id":"43","1":"ykfvjf","matier":"ykfvjf"},"record not available"]


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