使用Android Developer、PHP和MySQL的Android应用程序给出错误：org.json.JSONException:无状态值

我是Android新手，正在尝试使用PHP和MySQL与Android Developer Studio开发一个应用程序

我的RegisterActivity文件如下所示：

package com.mobiapp.hospmgmt;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.Date;

public class RegisterActivity extends AppCompatActivity {
    private static final String KEY_STATUS = "status";
    private static final String KEY_MESSAGE = "message";
    private static final String KEY_FULL_NAME = "full_name";
    private static final String KEY_USERNAME = "username";
    private static final String KEY_PASSWORD = "password";
    private static final String KEY_ADDR1 = "addr1";
    private static final String KEY_ADDR2 = "addr2";
    private static final String KEY_ADDR3 = "addr3";
    private static final String KEY_CITY = "city";
    private static final String KEY_PIN = "pin";
    private static final String KEY_STATE = "state";
    private static final String KEY_COUNTRY = "country";
    private static final String KEY_EMAIL = "email";
    private static final String KEY_PHONE = "phone";
    private static final String KEY_MOBILE = "mobile";
    private static final String KEY_USERTYPE = "usertype";

    private static final String KEY_EMPTY = "";
    private EditText etUsername;
    private EditText etPassword;
    private EditText etConfirmPassword;
    private EditText etFullName;
    private EditText etAddr1;
    private EditText etAddr2;
    private EditText etAddr3;
    private EditText etCity;
    private EditText etPin;
    private EditText etState;
    private EditText etCountry;
    private EditText etEmail;
    private EditText etPhone;
    private EditText etMobile;
    private EditText etUsertype;

    private String username;
    private String password;
    private String confirmPassword;
    private String fullName;
    private String addr1;
    private String addr2;
    private String addr3;
    private String city;
    private String pin;
    private String ustate;
    private String country;
    private String email;
    private String phone;
    private String mobile;
    private String usertype;

    private ProgressDialog pDialog;
    private String register_url = "http://192.168.42.252:80/hospmgmt/register.php";
    private SessionHandler session;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        session = new SessionHandler(getApplicationContext());
        setContentView(R.layout.activity_register);

        etUsername = findViewById(R.id.etUsername);
        etPassword = findViewById(R.id.etPassword);
        etConfirmPassword = findViewById(R.id.etConfirmPassword);
        etFullName = findViewById(R.id.etFullName);
        etAddr1 = findViewById(R.id.etAddr1);
        etAddr2 = findViewById(R.id.etAddr2);
        etAddr3 = findViewById(R.id.etAddr3);
        etCity = findViewById(R.id.etCity);
        etPin = findViewById(R.id.etPin);
        etState = findViewById(R.id.etState);
        etCountry = findViewById(R.id.etCountry);
        etEmail = findViewById(R.id.etEmail);
        etPhone = findViewById(R.id.etPhone);
        etMobile = findViewById(R.id.etMobile);
        etUsertype = findViewById(R.id.etUsertype);

        Button login = findViewById(R.id.btnRegisterLogin);
        Button register = findViewById(R.id.btnRegister);

        //Launch Login screen when Login Button is clicked
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(RegisterActivity.this, MainActivity.class);
                startActivity(i);
                finish();
            }
        });

        register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Retrieve the data entered in the edit texts
                username = etUsername.getText().toString().toLowerCase().trim();
                password = etPassword.getText().toString().trim();
                confirmPassword = etConfirmPassword.getText().toString().trim();
                fullName = etFullName.getText().toString().trim();
                addr1 = etAddr1.getText().toString().trim();
                addr2 = etAddr2.getText().toString().trim();
                addr3 = etAddr3.getText().toString().trim();
                city = etCity.getText().toString().trim();
                ustate = etState.getText().toString().trim();
                pin = etPin.getText().toString().trim();
                country = etCountry.getText().toString().trim();
                email = etEmail.getText().toString().trim();
                phone = etPhone.getText().toString().trim();
                mobile = etMobile.getText().toString().trim();
                usertype = etUsertype.getText().toString().trim();

                if (validateInputs()) {
                    registerUser();
                }

            }
        });

    }

    /**
     * Display Progress bar while registering
     */
    private void displayLoader() {
        pDialog = new ProgressDialog(RegisterActivity.this);
        pDialog.setMessage("Signing Up.. Please wait...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();

    }

    /**
     * Launch Dashboard Activity on Successful Sign Up
     */
    private void loadDashboard() {
        Intent i = new Intent(getApplicationContext(), DashboardActivity.class);
        startActivity(i);
        finish();

    }

    private void registerUser() {
        displayLoader();
        JSONObject request = new JSONObject();
        try {
            //Populate the request parameters
            request.put(KEY_USERNAME, username);
            request.put(KEY_PASSWORD, password);
            request.put(KEY_FULL_NAME, fullName);
            request.put(KEY_ADDR1, addr1);
            request.put(KEY_ADDR2, addr2);
            request.put(KEY_ADDR3, addr3);
            request.put(KEY_CITY, city);
            request.put(KEY_STATE, ustate);
            request.put(KEY_PIN, pin);
            request.put(KEY_COUNTRY,country);
            request.put(KEY_EMAIL, email);
            request.put(KEY_PHONE, phone);
            request.put(KEY_MOBILE, mobile);
            request.put(KEY_USERTYPE,usertype);

        } catch (JSONException e) {
            e.printStackTrace();
        }
        JsonObjectRequest jsArrayRequest = new JsonObjectRequest
                (Request.Method.POST, register_url, request, new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        pDialog.dismiss();
                        try {
                            //Check if user got registered successfully
                            if (response.getInt(KEY_STATUS) == 0) {
                                //Set the user session
                                session.loginUser(username,fullName);
                                loadDashboard();

                            }else if(response.getInt(KEY_STATUS) == 1){
                                //Display error message if username is already existsing
                                etUsername.setError("Username already taken!");
                                etUsername.requestFocus();

                            }else{
                                Toast.makeText(getApplicationContext(),
                                        response.getString(KEY_MESSAGE), Toast.LENGTH_SHORT).show();

                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }, new Response.ErrorListener() {

                    @Override
                    public void onErrorResponse(VolleyError error) {
                        pDialog.dismiss();

                        //Display error message whenever an error occurs
                        Toast.makeText(getApplicationContext(),
                                error.getMessage(), Toast.LENGTH_SHORT).show();

                    }
                });

        // Access the RequestQueue through your singleton class.
        ***MySingleton.getInstance(this).addToRequestQueue(jsArrayRequest);***
    }

    /**
     * Validates inputs and shows error if any
     * @return
     */
    private boolean validateInputs() {
        if (KEY_EMPTY.equals(fullName)) {
            etFullName.setError("Full Name cannot be empty");
            etFullName.requestFocus();
            return false;

        }
        if (KEY_EMPTY.equals(username)) {
            etUsername.setError("Username cannot be empty");
            etUsername.requestFocus();
            return false;
        }
        if (KEY_EMPTY.equals(password)) {
            etPassword.setError("Password cannot be empty");
            etPassword.requestFocus();
            return false;
        }

        if (KEY_EMPTY.equals(confirmPassword)) {
            etConfirmPassword.setError("Confirm Password cannot be empty");
            etConfirmPassword.requestFocus();
            return false;
        }
        if (!password.equals(confirmPassword)) {
            etConfirmPassword.setError("Password and Confirm Password does not match");
            etConfirmPassword.requestFocus();
            return false;
        }

        return true;
    }
}

<?php

ini_set('display_errors', 'On');
error_reporting(E_ALL | E_STRICT);

$response = array();
require("db/db_connect.php");
require("userfunctions.php");

//Get the input request parameters
$inputJSON = file_get_contents('php://input');

echo $inputJSON;
$input = json_decode($inputJSON, TRUE); //convert JSON into array
echo $input;

var_dump($inputJSON);
var_dump($input);
//Check for Mandatory parameters
if(isset($input['username']) && isset($input['password']) && isset($input['full_name'])){
    $userid = 0;
    $username = $input['username'];
    $password = $input['password'];
    $fullName = $input['full_name'];
    $datecreated = date("d/m/Y");
    $addr1 = $input['addr1'];
    $addr2 = $input['addr2'];
    $addr3 = $input['addr3'];
    $city = $input['city'];
    $pin = $input['pin'];
    $state = $input['state'];
    $country = $input['country'];
    $email = $input['email'];
    $phone = $input['phone'];
    $mobile = $input['mobile'];
    $usertype = $input['usertype'];

    //Check if user already exist
    if(!userExists($username)){

        //Get a unique Salt
        $salt         = getSalt();

        //Generate a unique password Hash
        $passwordHash = password_hash(concatPasswordWithSalt($password,$salt),PASSWORD_DEFAULT);

        //Query to register new user
        $insertQuery  = "INSERT INTO user(user_id, user_name, user_fullname, user_passwordhash, user_passwordsalt, user_datecreated, user_addr1, user_addr2, user_addr3, user_city, user_pin, user_state, user_country, user_email, user_phone, user_mobile, user_type) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
        if($stmt = $con->prepare($insertQuery)){
            $stmt->bind_param("issssssssssssssss", $userid, $username,$fullName,$passwordHash,$salt, $datecreated, $addr1, $addr2, $addr3, $city, $pin, $state, $country, $email, $phone, $mobile, $usertype);
            $stmt->execute();
            $response["status"] = 0;
            $response["message"] = "User created";
            error_log("$response set - 1");
            $stmt->close();
        }
        else{
            $response["status"] = 9;
            $response["message"] = "Error preparing INSERT query for database table USER";
            error_log("$response set - 2");
        }
    }
    else{
        $response["status"] = 1;
        $response["message"] = "User exists";
        error_log("$response set - 3");
    }
}
else{
    $response["status"] = 2;
    $response["message"] = "Missing mandatory parameters";
    error_log("$response set - 4");
}
error_log(var_dump($response));
echo json_encode($response);
?>

package com.mobiapp.hospmgmt；
导入android.app.ProgressDialog；
导入android.content.Intent；
导入android.os.Bundle；
导入android.support.v7.app.AppActivity；
导入android.view.view；
导入android.widget.Button；
导入android.widget.EditText；
导入android.widget.Toast；
导入com.android.volley.Request；
导入com.android.volley.Response；
导入com.android.volley.VolleyError；
导入com.android.volley.toolbox.JsonObjectRequest；
导入org.json.JSONException；
导入org.json.JSONObject；
导入java.util.Date；
公共类注册活动扩展了AppCompatActivity{
私有静态最终字符串密钥\u STATUS=“STATUS”；
私有静态最终字符串键\u MESSAGE=“MESSAGE”；
私有静态最终字符串键\u FULL\u NAME=“FULL\u NAME”；
私有静态最终字符串密钥\u USERNAME=“USERNAME”；
私有静态最终字符串密钥\u PASSWORD=“PASSWORD”；
私有静态最终字符串键\u ADDR1=“ADDR1”；
私有静态最终字符串键\u ADDR2=“ADDR2”；
私有静态最终字符串键\u ADDR3=“ADDR3”；
私有静态最终字符串KEY_CITY=“CITY”；
私有静态最终字符串键\u PIN=“PIN”；
私有静态最终字符串KEY_STATE=“STATE”；
私有静态最终字符串密钥\u COUNTRY=“COUNTRY”；
私有静态最终字符串密钥\u EMAIL=“EMAIL”；
专用静态最终字符串键\u PHONE=“PHONE”；
私有静态最终字符串密钥\u MOBILE=“MOBILE”；
私有静态最终字符串键\u USERTYPE=“USERTYPE”；
私有静态最终字符串密钥_EMPTY=“”；
私有编辑文本和用户名；
私人编辑文本和密码；
私有EditText etConfirmPassword；
私有编辑文本etFullName；
私有编辑文本etAddr1；
私有编辑文本etAddr2；
私有编辑文本etAddr3；
私人城市；
私人编辑文本etPin；
国家私人编辑部；
国家私人编辑部；
私人编辑邮件；
私人编辑文本电话；
私人编辑文本和手机；
私有EditText etUsertype；
私有字符串用户名；
私有字符串密码；
私有字符串确认密码；
私有字符串全名；
私有字符串addr1；
私有字符串addr2；
私有字符串addr3；
私人城市；
私有字符串pin；
私有字符串ustate；
私人国家；
私人字符串电子邮件；
私人电话；
私有字符串移动；
私有字符串用户类型；
私人对话；
专用字符串寄存器\u url=”http://192.168.42.252:80/hospmgmt/register.php";
私有会话处理程序会话；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
session=newsessionhandler（getApplicationContext（））；
setContentView（R.layout.activity\u寄存器）；
etUsername=findviewbyd（R.id.etUsername）；
etPassword=findviewbyd（R.id.etPassword）；
etConfirmPassword=findviewbyd（R.id.etConfirmPassword）；
etFullName=findviewbyd（R.id.etFullName）；
etAddr1=findViewById（R.id.etAddr1）；
etAddr2=findviewbyd（R.id.etAddr2）；
etAddr3=findviewbyd（R.id.etAddr3）；
etCity=findviewbyd（R.id.etCity）；
etPin=findviewbyd（R.id.etPin）；
etState=findviewbyd（R.id.etState）；
etCountry=findviewbyd（R.id.etCountry）；
etEmail=findviewbyd（R.id.etEmail）；
etPhone=findviewbyd（R.id.etPhone）；
etMobile=findviewbyd（R.id.etMobile）；
etUsertype=findviewbyd（R.id.etUsertype）；
按钮登录=findViewById（R.id.btnRegisterLogin）；
按钮寄存器=findViewById（R.id.btnRegister）；
//单击登录按钮时启动登录屏幕
login.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
意图i=新意图（RegisterActivity.this，MainActivity.class）；
星触觉（i）；
完成（）；
}
});
register.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
//检索编辑文本中输入的数据
username=etUsername.getText（）.toString（）.toLowerCase（）.trim（）；
password=etPassword.getText（）.toString（）.trim（）；
confirmPassword=etConfirmPassword.getText（）.toString（）.trim（）；
fullName=etFullName.getText（）.toString（）.trim（）；
addr1=etAddr1.getText（）.toString（）.trim（）；
addr2=etAddr2.getText（）.toString（）.trim（）；
addr3=etAddr3.getText（）.toString（）.trim（）；
city=etCity.getText（）.toString（）.trim（）；
ustate=etState.getText（）.toString（）.trim（）；
pin=etPin.getText（）.toString（）.trim（）；
country=etCountry.getText（）.toString（）.trim（）；
email=etEmail.getText（）.toString（）.trim（）；
phone=etPhone.getText（）.toString（）.trim（）；
mobile=etMobile.getText（）.toString（）.trim（）；
usertype=etUsertype.getText（）.toString（）.trim（）；
如果（validateInputs（））{
registerUser（）；
}
}
});
}
/**
*注册时显示进度条
*/
私有void displayLoader（）{
pDialog=newprogressdialog（RegisterActivity.this）；
pDialog.setMessage（“正在注册..请稍候…”）；
pDialog.setUndeterminate（假）；
pDialog.setCancelable（假）；
pDialog.show（）；
}
/**
*成功注册后启动仪表板活动
*/
私有void loadDashboard（）{
意图
 StringRequest sr = new StringRequest(Request.Method.POST, "url", new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                Log.e("response", response);
              try {
                    JSONObject object = new JSONObject(response);
                    String status = object.getString("status");
                  if (status.equals("0"){
                      //do something
                    }
                  } catch (JSONException e) {
                    progressDialog.dismiss();
                    Toast.makeText(OtpVerfication.this, "Please check network connection" + e, Toast.LENGTH_LONG).show();
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                progressDialog.dismiss();
                VolleyLog.d("Daily_bonus", "Error " + error.getMessage());
                if (error instanceof TimeoutError || error instanceof NoConnectionError) {
                    Toast.makeText(OtpVerfication.this, "Seems your internet connection is slow, please try in sometime. ",
                            Toast.LENGTH_LONG).show();
                } else if (error instanceof AuthFailureError) {
                    Toast.makeText(OtpVerfication.this, " Authentication error occurred, please try again later",
                            Toast.LENGTH_LONG).show();
                } else if (error instanceof ServerError) {
                    Toast.makeText(OtpVerfication.this, " Server error occurred, please try again later",
                            Toast.LENGTH_LONG).show();
                } else if (error instanceof NetworkError) {
                    Toast.makeText(OtpVerfication.this, " Network error occurred, please try again later",
                            Toast.LENGTH_LONG).show();
                } else if (error instanceof ParseError) {
                    Toast.makeText(OtpVerfication.this, " An error occurred, please try again later",
                            Toast.LENGTH_LONG).show();
                }
            }
        }) {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> params = new HashMap<String, String>();
                params.put("name", "abc");//passing parameters

                return params;
            }
        };
        sr.setRetryPolicy(new DefaultRetryPolicy(20000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(sr);

<?php

ini_set('display_errors', 'On');
error_reporting(E_ALL | E_STRICT);

$response = array();
require("db/db_connect.php");
require("userfunctions.php");


$input= $_POST;

//Check for Mandatory parameters
if(isset($input['username']) && isset($input['password']) && isset($input['full_name'])){
    $userid = 0;
    $username = $input['username'];
    $password = $input['password'];
    $fullName = $input['full_name'];
    $datecreated = date("d/m/Y");
    $addr1 = $input['addr1'];
    $addr2 = $input['addr2'];
    $addr3 = $input['addr3'];
    $city = $input['city'];
    $pin = $input['pin'];
    $state = $input['state'];
    $country = $input['country'];
    $email = $input['email'];
    $phone = $input['phone'];
    $mobile = $input['mobile'];
    $usertype = $input['usertype'];

    //Check if user already exist
    if(!userExists($username)){

        //Get a unique Salt
        $salt         = getSalt();

        //Generate a unique password Hash
        $passwordHash = password_hash(concatPasswordWithSalt($password,$salt),PASSWORD_DEFAULT);

        //Query to register new user
        $insertQuery  = "INSERT INTO user(user_id, user_name, user_fullname, user_passwordhash, user_passwordsalt, user_datecreated, user_addr1, user_addr2, user_addr3, user_city, user_pin, user_state, user_country, user_email, user_phone, user_mobile, user_type) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
        if($stmt = $con->prepare($insertQuery)){
            $stmt->bind_param("issssssssssssssss", $userid, $username,$fullName,$passwordHash,$salt, $datecreated, $addr1, $addr2, $addr3, $city, $pin, $state, $country, $email, $phone, $mobile, $usertype);
            $stmt->execute();
            $response["status"] = 0;
            $response["message"] = "User created";
            error_log("$response set - 1");
            $stmt->close();
        }
        else{
            $response["status"] = 9;
            $response["message"] = "Error preparing INSERT query for database table USER";
            //error_log("$response set - 2");
        }
    }
    else{
        $response["status"] = 1;
        $response["message"] = "User exists";
        //error_log("$response set - 3");
    }
}
else{
    $response["status"] = 2;
    $response["message"] = "Missing mandatory parameters";
    //error_log("$response set - 4");
}
//error_log(var_dump($response));
echo $response;
?>