Apps MySQL connect and query

[Sebastian huth]

Hello dear helpers,
I'm new to app development and with the help of a youtube tutorial I started an app that should connect to an SQL server and query data, but now I get an error that I can't sort and hope for help from you.

Code MainActivity.java:

package com.huth.system;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

public class MainActivity extends AppCompatActivity {
    Connection connect;
    String ConnectionResult = "";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void GetTextFromSQL(View v)
    {
        TextView tx1 = (TextView) findViewById(R.id.textView);
        TextView tx2 = (TextView) findViewById(R.id.textView2);
        try {
            ConnectionHelper connectionHelper = new ConnectionHelper();
            connect = connectionHelper.connectionclass();
            if(connect!=null)
            {
                String query = "SELECT * FROM `app`.`app_user` where id='1';";
                Statement st = connect.createStatement();
                ResultSet rs = st.executeQuery(query);

                while (rs.next()){
                    tx1.setText(rs.getString( 1));
                    tx2.setText(rs.getString( 2));
                }
            }
            else
            {
                ConnectionResult = "Check Connection";
            }
        }
        catch (Exception ex){
            Log.e("error2", ex.getMessage());
        }
    }
}

Code ConnectionHelper.java:

package com.huth.system;


import android.annotation.SuppressLint;
import android.os.StrictMode;
import android.util.Log;

import java.sql.Connection;
import  java.sql.DriverManager;

public class ConnectionHelper {
    Connection con;
    String uname, pass, ip, port,database;
    @SuppressLint("NewApi")
    public Connection connectionclass(){
        ip= "*******************";
        port = "*****************";
        uname = "*************";
        pass = "****************";
        database = "************";

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
        Connection connection = null;
        String ConnectionURL  = null;
        try{
            Class.forName("net.sourceforge.jtds.jdbc.Driver");
            ConnectionURL = "jdbc:jtds:sqlserver://"+ ip + ":"+ port+";"+ "databasename="+ database+";user="+uname+";password="+pass+";";
            connection = DriverManager.getConnection(ConnectionURL);
        }
        catch (Exception ex){
            Log.e("error", ex.getMessage());
        }
        return connection;
    }
}

error massage:

E/error: I/O Error: Unknown packet type 0x63

pls help me