Writing in a TextView numbers from 1 to 10, and display the progress bar during the process

PorgressBarExample.java

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class PorgressBarExample extends AppCompatActivity {
    Button boton;
    TextView textView;
    ProgressBar progressBar;

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

        boton = (Button) findViewById(R.id.boton);
        textView = (TextView) findViewById(R.id.textview);
        progressBar = (ProgressBar) findViewById(R.id.progressbar);
        progressBar.setVisibility(View.INVISIBLE);

        textView.setMovementMethod(new ScrollingMovementMethod()); // android:scrollbars="vertical" kodeari kaso egiteko



        boton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MyTask task = new MyTask();
                task.execute();
            }
        });
    }

    public void cargarDatos(String datos){
        textView.append(datos+"\n");
    }

    private class MyTask extends AsyncTask<String, String, String>{

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            cargarDatos("Inicio de carga");
            progressBar.setVisibility(View.VISIBLE);

        }

        @Override
        protected String doInBackground(String... params) {

                for(int i=0; i<=10; i++){
                    //No podemos cambiar la interface en doInBackground pq es el hilo principal. Por eso debemos de usar publishProgress dentro de el
                    publishProgress("Numero: "+i);
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            return "Terminamos";

        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            cargarDatos(s);
            progressBar.setVisibility(View.INVISIBLE);

        }

        @Override
        protected void onProgressUpdate(String... values) {
            cargarDatos(values[0]);
        }
    }
}