发送id，然后使用volley和php获取注册数据

String url = "http://example.com/register.php?id=" + id;

StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
    new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            // 处理服务器返回的注册数据
        }
    },
    new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            // 处理请求错误
        }
    });

// 将请求添加到请求队列
RequestQueue requestQueue = Volley.newRequestQueue(context);
requestQueue.add(stringRequest);

<?php
$id = $_GET['id'];

// 连接数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 查询注册数据
$sql = "SELECT * FROM registration WHERE id = " . $id;
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出数据
    while($row = $result->fetch_assoc()) {
        echo "姓名: " . $row["name"]. " - 邮箱: " . $row["email"]. "<br>";
    }
} else {
    echo "没有找到注册数据";
}

$conn->close();
?>