如何将POST请求从Android发送到PHP

我似乎无法在网上找到最近的教程,因为它们中的大多数(例如HttpClient)都被贬低了。

这是我的联系方式:登录学生.php

<?php

include('./db/dbconn.php');

$stud_idno = $_POST["idno"];
$stud_passw = $_POST["passw"];

$row=getStudent($stud_idno, $stud_passw);
header('Content-Type: application/json');
echo json_encode(array('student'=>$row));

?>

从我的数据库中获取学生信息的代码:数据库连接.php

function getStudent($idno, $passw){
    global $conn;
    $row;
    try{
        connect();
        $sql="SELECT * FROM student_tbl WHERE stud_idno=? and stud_passw=?";
        $stmt=$conn->prepare($sql);
  $stmt->execute(array($idno, $passw));
        $row=$stmt->fetch(PDO::FETCH_ASSOC);
    }catch(PDOException $e){ echo $e->getMessage();}
    return $row;
}

我的android应用程序所做的是显示一个alertdialog,请求localhost(已经修复),然后显示另一个对话框,请求他们登录。

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {

    ListView listView;
    ArrayList<QuestionItem> arrayList = new ArrayList<QuestionItem>();
    ArrayAdapter<QuestionItem> adapter;
    String ip;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //allow a parallel thread to run alongside
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);


        //
        listView = findViewById(R.id.listview_questions);
        adapter = new ArrayAdapter<QuestionItem>(this, android.R.layout.simple_list_item_1, arrayList);
        listView.setAdapter(adapter);

        listView.setOnItemClickListener(this);


    }

    @Override
    protected void onStart() {
        super.onStart();

//        localhostDialog(); //
        loginDialog();

    }

    public void localhostDialog(){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        LayoutInflater inflater = this.getLayoutInflater();
        final View dialogView = inflater.inflate(R.layout.dialog_localhost, null);
        builder.setView(dialogView);

        final EditText localhost = dialogView.findViewById(R.id.edit_localhost);
        builder.setPositiveButton("Okay", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                MyUtility.ipaddress = localhost.getText().toString();

                try {
                    URL url = new URL("http://"+MyUtility.ipaddress+"/skillstest42/db/getall.php");
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();

                    InputStream is = conn.getInputStream();
                    StringBuffer data = new StringBuffer();
                    int ch=0;
                    while ((ch=is.read())!=-1){
                        data.append((char)ch);
                    }

                    is.close();
                    conn.disconnect();
Toast.LENGTH_SHORT).show();

                    //..........

                        }

                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });

        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                finish();
            }
        });
        builder.show();
    }

    public void loginDialog(){
        AlertDialog.Builder sbuilder = new AlertDialog.Builder(this);
        LayoutInflater sinflater = this.getLayoutInflater();
        final View studentView = sinflater.inflate(R.layout.dialog_student, null);
        sbuilder.setView(studentView);

        final EditText stud_idno = studentView.findViewById(R.id.edit_idno);
        final EditText stud_passw = studentView.findViewById(R.id.edit_passw);

       //.....

        sbuilder.show();
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

       //....

}

我怎么可能从我的android应用程序发送POST请求?感谢您在此场景中提供的任何帮助。