如何連接或鏈接到本地​​主機服務器地址在Android Studio

Question

我正在做一個Android的登錄註冊的教程由tonakami電視在youtube，我遇到了一個問題，其中Android應用程序無法更新或連接到數據庫通過LOCALHOST XAMPP。一個星期，我堅持搜索所有可能的解決方案，但沒有發現。也許你們可以幫我解決我的PHP文件問題（register.php和fetchuserdata.php），我也發現我在php文件中也有這個錯誤：mysqli_connect（）:(HY000/1044）：訪問拒絕用戶'my_user'@'localhost'到數據庫'my_db'。我授予所有權限，但仍然無法連接，我不知道問題是從PHP文件，到android studio中的服務器還是XAMPP本地主機phpmyadmin的鏈接。謝謝 ！

Screenshot of Android Studio: highlighted link

Register.php

<?php 
$con=mysqli_connect("localhost","my_user","my_password","my_db"); 

$name = $_POST["name"]; 
$age = $_POST["age"]; 
$username = $_POST["username"]; 
$password = $_POST["password"]; 
$statement = mysqli_prepare($con, "INSERT INTO User (name, age, username, password) VALUES (?, ?, ?, ?)"); 
mysqli_stmt_bind_param($statement, "siss", $name, $age, $username, $password); 
mysqli_stmt_execute($statement); 
mysqli_stmt_close($statement); 
mysqli_close($con); 
?> 

FetchUserData.php

<?php 
$con=mysqli_connect("localhost","my_user","my_password","my_db"); 

$username = $_POST["username"]; 
$password = $_POST["password"]; 

$statement = mysqli_prepare($con, "SELECT * FROM User WHERE username = ? AND password = ?"); 
mysqli_stmt_bind_param($statement, "ss", $username, $password); 
mysqli_stmt_execute($statement); 

mysqli_stmt_store_result($statement); 
mysqli_stmt_bind_result($statement, $userID, $name, $age, $username,  $password); 

$user = array(); 

while(mysqli_stmt_fetch($statement)){ 
    $user["name"] = $name; 
    $user["age"] = $age; 
    $user["username"] = $username; 
    $user["password"] = $password; 
} 

echo json_encode($user); 
mysqli_close($con); 
?> 

Answer 1

而不是本地主機使用：http://10.0.2.2 Reference