Handel AsyncTask with Horizontal progress Bar

MainActivity.java

package com.mostafaanter.manageasynctaskwithhorizontalprogressbar;

import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity {
    private TextView tv ;
    private ProgressBar pb;
    private int prograssStatus = 0;

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

        tv = (TextView)findViewById(R.id.textView);
        tv.setMovementMethod(new ScrollingMovementMethod());

        pb = (ProgressBar)findViewById(R.id.progressBar);
        pb.setVisibility(View.INVISIBLE);


    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {

            MyTask myTask = new MyTask();
            myTask.execute("Param1", "Param2", "Param3");
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void updateText(String task) {
        tv.append(task + "\n");
    }
    private class MyTask extends AsyncTask<String, String, String>{
        @Override
        protected void onPreExecute() {
            updateText("Starting Task..");
            pb.setVisibility(View.VISIBLE);
        }

        @Override
        protected String doInBackground(String... params) {
            for(int i=0; i<params.length; i++){
                prograssStatus += 34;
                publishProgress("Working with Param" + params[i]);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                pb.setProgress(prograssStatus);
            }
            return "Task Done.";
        }

        @Override
        protected void onPostExecute(String s) {
            updateText(s);
            prograssStatus = 0;
            pb.setVisibility(View.INVISIBLE);
        }

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