MainActivity.java async task

package com.example.saigopinarimeti.helloworld;

import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        findViewById(R.id.startAsync).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                DoInBackGroundAsyn doInBackGroundAsyn = new DoInBackGroundAsyn(MainActivity.this);
                doInBackGroundAsyn.execute(5000);
            }
        });
    }

    class DoInBackGroundAsyn extends AsyncTask<Integer,Integer,Boolean>{

        ProgressDialog progressDialog;

        Context context;
        DoInBackGroundAsyn(Context context){
            this.context = context;
        }

        @Override
        protected void onPreExecute() {
            Toast.makeText(context, "started", Toast.LENGTH_SHORT).show();
            super.onPreExecute();
            progressDialog = new ProgressDialog(context);
            progressDialog.setMessage("Loading ...");
            progressDialog.show();
        }

        @Override
        protected Boolean doInBackground(Integer... integers) {

            // our logic

            int sleepSec = integers[0];
            try {
                Thread.sleep(sleepSec);
                //onProgressUpdate(12);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            return true;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
        }

        @Override
        protected void onPostExecute(Boolean aBoolean) {
            super.onPostExecute(aBoolean);
            Toast.makeText(context, "ended", Toast.LENGTH_SHORT).show();
            progressDialog.dismiss();
        }
    }


}