Android应用未连接到localhost - 拒绝连接到localhost

Question

我正在尝试将数据从Android应用程序发送到托管在localhost服务器上的PHP脚本。 PHP文件位于我的XAMPP文件夹的htdocs中，我总是把它放在那里。这是我发送数据的方法：

@Override
    protected Void doInBackground(Void... params) {
            ArrayList<NameValuePair> dataToSend = new ArrayList<>();
            dataToSend.add(new BasicNameValuePair("name", user.name));
            dataToSend.add(new BasicNameValuePair("age", user.age + ""));
            dataToSend.add(new BasicNameValuePair("username", user.username));
            dataToSend.add(new BasicNameValuePair("password", user.password));
            dataToSend.add(new BasicNameValuePair("phoneNumber", user.phoneNumber));

        HttpParams httpRequestParams = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpRequestParams, CONNECTION_TIMEOUT);
        HttpConnectionParams.setSoTimeout(httpRequestParams, CONNECTION_TIMEOUT);

        HttpClient client = new DefaultHttpClient(httpRequestParams);
        //HttpPost post = new HttpPost(SERVER_ADDRESS + "Register.php");
        HttpPost post = new HttpPost("http://127.0.0.1/register.php");

        try{
            post.setEntity(new UrlEncodedFormEntity(dataToSend));
            client.execute(post);
        }catch(Exception e){
            e.printStackTrace();
        }
        return null;
    }

当我提交数据时，收到以下错误：

org.apache.http.conn.HttpHostConnectException: Connection to http://127.0.0.1 refused

我已经尝试将ip地址更改为localhost，但这没有任何改变。

这是我的PHP脚本

<?php
$con = mysqli_connect("localhost", "root", "", "is_clients");

$name = $_POST["name"];
$age = $_POST["age"];
$username = $_POST["username"];
$password = $_POST["password"];
$phoneNumber = $_POST["phoneNumber"];

$statement = mysqli_prepare($con, "INSERT INTO user (name, age, username, password, phoneNumber) VALUES (?, ?, ?, ?, ?) "); 
mysqli_stmt_bind_param($statement, "sisss", $name, $age, $username, $password, $phoneNumber);
mysqli_stmt_execute($statement);

mysqli_stmt_close($statement);

mysqli_close($con);

＆GT;

其目的是在没有密码的情况下将数据发送到MySQL数据库。

如何访问PHP脚本？

提前致谢。