php - I want to show names of people on the listview in android through json -

i using asynctask through want json array of names , want show in listview . here php code:

    $con=mysqli_connect("localhost","root","","raheel");      $id=intval($_post['id']);     $mysqli_qry="select* name name_id='$id'; ";      $result=mysqli_query($con,$mysqli_qry)or die("error occur in connection" . mysqli_error($con));    $rowcount=mysqli_num_rows($result);      $arr=array();      if($rowcount>0) {     while($row=mysqli_fetch_assoc($result))    {           $arr=$row;      }    } header('content-type: application/json'); echo json_encode($arr);  mysqli_close($con  ?> 

the problem facing how json array in asynctask mode , assign data(names) listview home.java code: package com.example.raheel.bank;

public class home extends appcompatactivity implements homecallback {  listview listview; private listadapter madapter;   p public arraylist<string > info;  @override  protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_home);     toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);     setsupportactionbar(toolbar);         listview=(listview)findviewbyid(r.id.listview);       int id=0;           } backgroundhome home=new backgroundhome(home.this, (callback)home. this); @override public void processdata(jsonarray data) {              if(data!=null)             {                 info=new arraylist<>();                 try                 {                       for(int i=0;i<data.length();i++)                     {                          jsonobject js=data.getjsonobject(i);                     }                     } catch (jsonexception e) {                     e.printstacktrace();                 }              }     madapter=new arrayadapter<string>(this,android.r.layout.simple_list_item_1,info);     listview.setadapter(madapter);    } 

}

 class backgroundhome extends asynctask<integer,integer,jsonarray>{    context c; callback callback;  public backgroundhome(context c, callback callback) {     this.c = c;     this.callback = callback; }  @override protected jsonarray doinbackground(integer...params) {      jsonarray js=null;      string url=c.getstring(r.string.url) +"home.php";      try {         httprequest httprequest = new httprequest(url);         hashmap<string, string> values = new hashmap<>();         values.put("id", integer.tostring(params[0]));         js = httprequest.prepare(httprequest.method.post).withdata(values).sendandreadjsonarray();     } catch (ioexception e) {         e.printstacktrace();     } catch (jsonexception e) {         e.printstacktrace();     }     return js; }  protected void onpostexecute(jsonarray jsonarray){      homecallback.processdata(jsonarray); }        }   interface homecallback{  public void processdata(jsonarray data);   } 

this home.java file dnt know how json array of names php file.

you have add data array this. modifying $arr = $row $arr[] = .. give result array key/value data. json_encode later in code convert json array needed application.

while($row=mysqli_fetch_assoc($result))        {             $arr[] = array('name' => $row["name"], 'id' => $row["name_id"]);         }