Android AsyncTask

public class MainActivity extends AppCompatActivity {

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

        new CountClass().execute("name 1", "name 2", "name 3");
    }

    class CountClass extends AsyncTask<String, String, String> {

        protected String doInBackground(String... strings) {
            for (int i=0; i<strings.length; i++) {
                try {
                    Thread.sleep(1000);
                    publishProgress(strings[i]);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            return "done";
        }

        protected void onProgressUpdate(String... progress) {
            ((TextView) findViewById(R.id.progressTextView)).setText(progress[0]);
        }

        protected void onPostExecute(String result) {
            ((TextView) findViewById(R.id.progressTextView)).setText(result);
        }

    }
    
}