Android device can’t connect to mysql in localhost [closed]

I’m developing an android app in android studio and I have a mysql database on my localhost. I’m using XAMPP so I’m using MariaDB and Apache.

When i run the emulator everything works fine but when I use the app in my physical device doesn’t work.

I have opened ports 80 and 3306 and give permissions in app manifest:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Java in android activity (I’m using volley for http requests):

public static void Register(String email,String password,Context context){
    StringRequest request = new StringRequest(Request.Method.POST, "http://xx.xx.x.x/android/register.php",
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {

                    User.setEmail(email);
                    User.setPassword(password);
                    Toast.makeText(context, "Registrado con éxito", Toast.LENGTH_SHORT).show();
                    context.startActivity(new Intent(context, MainActivity.class));


                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(context, "Ha ocurrido un error",Toast.LENGTH_SHORT).show();
                }
            }
    ){
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String,String> params = new HashMap<>();
            params.put("email",email);
            params.put("password",password);
            SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
            String date = sdf.format(new Date());
            params.put("date",date);

            return params;
        }
    };

    RequestQueue requestQueue = Volley.newRequestQueue(context);
    requestQueue.add(request);
}

xx.xx.x.x is my public ip.

register.php:

<?php

    if ($_SERVER ['REQUEST_METHOD'] == 'POST'){

    require_once("db.php");

    $email = $_POST['email'];
    $password = $_POST['password'];
    $date = $_POST['date'];

    $query = "INSERT INTO user (email, password, date) VALUES 
    ('$email','$password','$date')";

    $result = $mysql->query($query);

    if ($result == TRUE){
        echo "user created";
    }
    else{
        echo "user not created";
    }
    $mysql->close();
  }

db.php: The user rafa in my database has all permissions and can connect by any address. (I have tried to change “localhost” to my public ip but it doesn’t work either)

<?php


$mysql = new mysqli(
"localhost",
"rafa",
"1234",
"eduk"
);

if ( $mysql->connect_error){
  die( "failed to connect" . $mysql->connect_error);
}

And the error I am getting is : Ljava.lang.StackTraceElement;

I readed about the problem and people say that I need a hosting and everything will works fine but why I need it?

The emulator is supposed to act like another device but no physical, it’s the only difference. I can access to my apache server with the pyshical device, the problem must be on the connection to database or something. Maybe I need to use other library?

Answer

I have solved adding this on manifest…

    android:usesCleartextTraffic="true"