Android : AsyncTask or Progress bar without pressing Button

I want to use asynctask or progress bar in this program.Can i use Asynctask or Progress Bar in this program without pressing any button?

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    // Creating new JSON Parser
    JSONParser jParser = new JSONParser();
    // Getting JSON from URL
    JSONObject json = jParser.getJSONFromUrl(url);
    try {
      // Getting JSON Array
      user = json.getJSONArray(TAG_USER);
      JSONObject c = user.getJSONObject(0);
      // Storing  JSON item in a Variable
      String id = c.getString(TAG_ID);
      String name = c.getString(TAG_NAME);
      String email = c.getString(TAG_EMAIL);
      //Importing TextView
      final TextView uid = (TextView)findViewById(R.id.uid);
      final TextView name1 = (TextView)findViewById(R.id.name);
      final TextView email1 = (TextView)findViewById(R.id.email);
      //Set JSON Data in TextView
      uid.setText(id);
      name1.setText(name);
      email1.setText(email);
  } catch (JSONException e) {
    e.printStackTrace();
  }
    }
}