I got 1 app that is using retrofit2 to upload a picture to the 000webhost server and it works. Before that I used XAMPP to upload data to a database and now I am trying to move all of my work on XAMPP to 000webhost.
The problem is that I get an error message when I try to upload data and the error is could not invoke virtual method toString() on a null referance
.
The java code is the same and the php files are the same ,except from the URL.
I think there is a problem because the site is secured. Also using retrofit2 is difficult to me as I am having a hard time trying to understand how to use it but I can try with a good guide.
Not Duplicate: I know what is a nullPoint Exception, the problem is that I do not understand why I receive a null value from the server. The app can't access the php file so it doesn't get a response and I do not understand how to fix it.
Also why one app can access but the other can't.
create_product.php:
<?php
$response = array();
if (isset($_POST['name']) && isset($_POST['price']) && isset($_POST['description']))
{
$name = $_POST['name'];
$price = $_POST['price'];
$description = $_POST['description'];
require_once __DIR__ . '/db_connect.php';
$db = new DB_CONNECT();
$result = $db->query("INSERT INTO products(name, price, description) VALUES('$name', '$price', '$description')");
if ($result) {
$response["success"] = 1;
$response["message"] = "Product successfully created.";
echo json_encode($response);
} else {
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
echo json_encode($response);
}
} else {
$response["success"] = 0;
$response["message"] = "missing fields";
echo json_encode($response);
}
?>
JSONParser:
package com.example.user.onlineshop;
import android.content.ContentValues;
import android.util.Log;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
public class JSONParser {
static JSONObject jObj;
static String json;
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public static JSONObject makeHttpRequest(String url, String method, ContentValues params) {
// Making HTTP request
try {
final OkHttpClient client = new OkHttpClient();
Request request;
// check for request method
if (method.equals("POST")) {
// request method is POST
MediaType contentType = MediaType.parse("application/x-www-form-urlencoded; charset=UTF-8");
String content = "";
for (String key : params.keySet())
{
if ( !content.isEmpty())
content += "&";
content += key + "=" + params.get(key);
}
RequestBody body = RequestBody.create(contentType, content);
request = new Request.Builder().url(url).post(body).build();
}
else {
// request method is GET
request = new Request.Builder().url(url).build();
}
final Response response = client.newCall(request).execute();
json = response.body().string();
} catch (IOException e) {
e.printStackTrace();
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e ){
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
NewProductActivity:
package com.example.user.onlineshop;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.ContentValues;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import org.json.JSONException;
import org.json.JSONObject;
public class NewProductActivity extends Activity {
// Progress Dialog
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
EditText inputName;
EditText inputPrice;
EditText inputDesc;
ContentValues params;
String name;
String price;
String description;
// адрес для создания нового товара
IpAddressClass IAC= new IpAddressClass();
String ip=IAC.getIp();
private String url_create_product = "http://swane2.000webhostapp.com/PicUpload/create_product.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_product);
params = new ContentValues();
inputName = (EditText) findViewById(R.id.inputName);
inputPrice = (EditText) findViewById(R.id.inputPrice);
inputDesc = (EditText) findViewById(R.id.inputDesc);
Button btnCreateProduct = (Button) findViewById(R.id.btnCreateProduct);
btnCreateProduct.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// создаем новый товар в другом потоке
name = inputName.getText().toString();
price = inputPrice.getText().toString();
description = inputDesc.getText().toString();
new CreateNewProductTask().execute();
}
});
}
// Фоновая задача для создания нового товара
class CreateNewProductTask extends AsyncTask<String, String, String> {
// Сначала запустим окно с индикатором прогресса
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(NewProductActivity.this);
pDialog.setMessage("Creating product");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
}
// Создаем товар
protected String doInBackground(String... args) {
// Подготавливаем параметры
params.put("name", name);
params.put("price",price);
params.put("description", description);
// получаем объект JSON через POST
JSONObject json = jsonParser.makeHttpRequest(url_create_product,"POST", params);
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// при успешном создании товара
// запускаем активность всех товаров
Intent i = new Intent(getApplicationContext(), AllProductsActivity.class);
startActivity(i);
// закрываем экран активности
finish();
} else {
// не получилось создать товар
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
// закрываем диалоговое окно с индикатором
}
}
}
Edit: Before the error happens I get this message in the logcat:
D/NetworkSecurityConfig: No Network Security Config specified, using platform default