问为什么Android Studio Emulator不能运行POST请求的一部分(Java)

EN

public class PostSMS extends AsyncTask<Void, String, String>
{
@Override
protected String doInBackground(Void... params) {
    try {
        MainActivity.text.setText("enteredTry");


        URL url = new URL("https://api.apidaze.io/apikey/sms/send?api_secret=apisecret");
        HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();

        MainActivity.text.setText("connectionBuilt");


        urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

        urlConnection.setRequestMethod("POST");
        MainActivity.text.setText("connectionEstablished1");
        urlConnection.connect();

        MainActivity.text.setText("connectionEstablished23");

        // Create JSONObject Request
        JSONObject jsonRequest = new JSONObject();
        jsonRequest.put("from", "1111111111");
        jsonRequest.put("to", "1111111112");
        jsonRequest.put("body", "Hello, World");

        MainActivity.text.setText("jsonArrayConstructed");

        // Write Request to output stream to server
        OutputStreamWriter out = new OutputStreamWriter(urlConnection.getOutputStream());
        out.write(jsonRequest.toString());
        out.close();

        MainActivity.text.setText("OutputStream written");

        int statusCode = urlConnection.getResponseCode();
        String statusMsg = urlConnection.getResponseMessage();

        // Connection success. Proceed to fetch the response.
        if (statusCode == 200)
        {
            InputStream it = new BufferedInputStream(urlConnection.getInputStream());
            InputStreamReader read = new InputStreamReader(it);
            BufferedReader buff = new BufferedReader(read);
            StringBuilder dta = new StringBuilder();
            String chunks;
            while ((chunks = buff.readLine()) != null)
            {
                dta.append(chunks);
            }
            String returndata = dta.toString();
            return returndata;
        }
    catch (ProtocolException e)
    {
        e.printStackTrace();
    } catch (MalformedURLException e)
    {
        e.printStackTrace();
    } catch (IOException e)
    {
        e.printStackTrace();
    } catch (Exception e)
    {
        e.printStackTrace();
    }

    return null;
}

urlConnection.setRequestMethod("POST");
MainActivity.text.setText("connectionEstablished1");

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