问Android:发送一个简单的请求，但Volley不起作用

EN

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val textView = findViewById<TextView>(R.id.text)

        val queue = Volley.newRequestQueue(this)
        val url = "http://www.apple.com"

        // Request a string response from the provided URL.
        val stringRequest = StringRequest(Request.Method.GET, url, Response.Listener<String> { response ->
                // Display the first 500 characters of the response string.
                textView.text = "Response is: ${response.substring(0, 500)}"
            },
            Response.ErrorListener { textView.text = "That didn't work!" })

        // Add the request to the RequestQueue.
        queue.add(stringRequest)

    }

}