android - org.json.JSONException:Value of type java.lang.String cannot be converted to JSONArray -

i'm building application in i'm receiving jsonarray server , i'm using volley library send , receive response server when click on button send i'm getting value of type java.lang.string cannot converted jsonarray in toast

jsonarray

    [{"username":"ude","password":"hello"}] 

login.java

public class login extends activity { button log; edittext username, passsword; string user, pass; string tag_json_arry = "jarray_req"; private string jsonresponse; private static string tag = login.class.getsimplename();   protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate); setcontentview(r.layout.login);     username = (edittext) findviewbyid(r.id.username);     passsword = (edittext) findviewbyid(r.id.password);     log = (button) findviewbyid(r.id.login);      log.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             user = username.gettext().tostring().trim();             pass = passsword.gettext().tostring().trim();             makejsonobjreq();          }     });      private void makejsonobjreq() {     jsonarrayrequest jsonarrayreq = new jsonarrayrequest(request.method.post, const.url_json_object, null, new response.listener<jsonarray>() {         @override         public void onresponse(jsonarray response) {             log.d(tag, response.tostring());             try {                 // parsing json array response                 // loop through each json object                 jsonresponse = "";                 (int = 0; < response.length(); i++) {                      jsonobject person = (jsonobject) response                             .get(i);                      string name = person.getstring("username");                     string password = person.getstring("password");                      jsonresponse += "name: " + name + "\n\n";                     jsonresponse += "password: " + password + "\n\n";                  }                 toast.maketext(getapplicationcontext(), "" + jsonresponse, toast.length_long).show();              } catch (jsonexception e) {                 e.printstacktrace();                 toast.maketext(getapplicationcontext(),                         "error: " + e.getmessage(),                         toast.length_long).show();             }          }     }, new response.errorlistener() {          @override         public void onerrorresponse(volleyerror error) {             volleylog.d(tag, "error: " + error.getmessage());             toast.maketext(login.this, "" + error.getmessage(), toast.length_long).show();         }     }) {          /**          * passing request headers          * */         @override         public map<string, string> getheaders() throws authfailureerror {             hashmap<string, string> headers = new hashmap<>();             headers.put("content-type", "application/json");             return headers;         }          @override         protected map<string, string> getparams() {             map<string, string> params = new hashmap<>();             params.put("username", user);             params.put("password", pass);              return params;         }      };      // adding request request queue     appcontroller.getinstance().addtorequestqueue(jsonarrayreq,             tag_json_arry);      // cancelling request     // applicationcontroller.getinstance().getrequestqueue().cancelall(tag_json_obj); } 

php:

<?php  require_once "connect.php";   $username = $_request["username"]; $password = $_request["password"]; $return = [];  $stmt = $pdo->prepare("select * users username = :username ,  password = :password limit 1"); $stmt->bindparam(":username", $username); $stmt->bindparam(":password",$password);  $stmt->execute();   $result = $stmt->fetchall(pdo::fetch_assoc);   if(!$result){  echo json_encode("fail");   } else{  // array json response $response = array(); $response["users"] = array();   $users= array();   $users["username"] = $result["username"];  $users["password"] = $result["password"];  array_push($response["apps"], $users);   $response["success"] = 1;    echo json_encode($response);  }    $pdo = null;   ?>  

try :

public void onresponse(jsonarray response) {             log.d(tag, response.tostring());             try {                 // parsing json array response                 // loop through each json object                 string responsestring = response.tostring();                 jsonarray jarray = new jsonarray(responsestring);                 (int = 0; < jarray.length(); i++) {                      jsonobject person = jarray.getjsonobject(i);                       string name = person.getstring("username");                     string password = person.getstring("password");                      jsonresponse += "name: " + name + "\n\n";                     jsonresponse += "password: " + password + "\n\n";                  }