php - org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject (Andriod Studio) -

i'm trying android app developed in android studio send data register user activity database. idea once user types in required information , clicks register button data should go database , login activity should re-appear. however, when click on register button on register user activity nothing happening, no redirection login activity or data being sent database.

below register user activity code:

package com.example.vi5h.split; import android.content.intent; import android.support.v7.app.alertdialog; import android.support.v7.app.appcompatactivity; import android.os.bundle; import android.view.view; import android.widget.button; import android.widget.edittext; import com.android.volley.requestqueue; import com.android.volley.response; import com.android.volley.toolbox.volley; import org.json.jsonexception; import org.json.jsonobject;  public class registeruseractivity extends appcompatactivity {  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_register_user);      final edittext etfullname = (edittext) findviewbyid(r.id.etfullname);     final edittext etusername = (edittext) findviewbyid(r.id.etusername);     final edittext etpassword = (edittext) findviewbyid(r.id.etpassword);     final edittext etemail = (edittext) findviewbyid(r.id.etemail);     final button btnregister = (button) findviewbyid(r.id.btnregister);      btnregister.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {              final string name = etfullname.gettext().tostring();             final string username = etusername.gettext().tostring();             final string password = etpassword.gettext().tostring();             final string email = etemail.gettext().tostring();              response.listener<string> responselistener = new response.listener<string>(){                  @override                 public void onresponse(string response) {                       try {                         jsonobject jsonresponse = new jsonobject(response);                         boolean success = jsonresponse.getboolean("success");                          if (success){                             intent intent = new intent(registeruseractivity.this, loginactivity.class);                             registeruseractivity.this.startactivity(intent);                          }else {                             alertdialog.builder builder = new alertdialog.builder(registeruseractivity.this);                             builder.setmessage("register failed")                                     .setnegativebutton("retry", null)                                     .create()                                     .show();                         }                       } catch (jsonexception e) {                         e.printstacktrace();                     }                   }             };               registerrequest registerrequest = new registerrequest(name, username, email, password, responselistener);             requestqueue queue = volley.newrequestqueue(registeruseractivity.this);             queue.add(registerrequest);           }     });    } } 

below register request class code:

package com.example.vi5h.split; import com.android.volley.response; import com.android.volley.toolbox.stringrequest; import java.util.hashmap; import java.util.map;   public class registerrequest extends stringrequest {  private static final string register_request_url = "https://split.000webhostapp.com/register.php"; private map<string, string> params;  public registerrequest(string name, string username, string email, string password, response.listener<string> listener) {      super(method.post, register_request_url, listener, null);     params = new hashmap<>();     params.put("name", name);     params.put("username", username);     params.put("email", email);     params.put("password", password); }   @override public map<string, string> getparams() {     return params; } } 

below php script (register.php):

<?php $con = mysqli_connect("localhost", "id2833909_split421", "pass321", "id2833909_splitw");  $name = $_post["name"]; $email = $_post["email"]; $username = $_post["username"]; $password = $_post["password"]; $statement = mysqli_prepare($con, "insert user (name, username, email, password) values (?, ?, ?, ?)"); mysqli_stmt_bind_param($statement, "siss", $name, $username, $email, $password); mysqli_stmt_execute($statement);  $response = array(); $response["success"] = true;    echo json_encode($response); ?> 

and finnally below error thrown on logcat after tapped register button: https://imgur.com/b8x0su6

if visit https://split.000webhostapp.com/register.php in web browser, broken content. not complete web page, instead bunch of error messages:

<br /> <b>notice</b>:  undefined index: name in <b>/storage/ssd5/909/2833909/public_html/register.php</b> on line <b>4</b><br /> <br /> <b>notice</b>:  undefined index: email in <b>/storage/ssd5/909/2833909/public_html/register.php</b> on line <b>5</b><br /> <br /> <b>notice</b>:  undefined index: username in <b>/storage/ssd5/909/2833909/public_html/register.php</b> on line <b>6</b><br /> <br /> <b>notice</b>:  undefined index: password in <b>/storage/ssd5/909/2833909/public_html/register.php</b> on line <b>7</b><br /> <br /> <b>warning</b>:  mysqli_stmt_bind_param() expects parameter 1 mysqli_stmt, boolean given in <b>/storage/ssd5/909/2833909/public_html/register.php</b> on line <b>9</b><br /> <br /> <b>warning</b>:  mysqli_stmt_execute() expects parameter 1 mysqli_stmt, boolean given in <b>/storage/ssd5/909/2833909/public_html/register.php</b> on line <b>10</b><br /> {"success":true} 

the first 3 characters of response <br. happen first 3 characters json parser complaining in error message. so, guess web server sending same sort of broken content in response volley request.

so, take @ response , see getting plain text. then, fix whatever problem response indicates.