Android - how to hide / show progressbar onclick

Question

I am trying to show a progressbar when a button is clicked. When i test the app it force closes / stops. My app works fine before the progressbar code is added in.

also

Answer 1

            ProgressDialog progressDialog = new ProgressDialog(this);
    progressDialog.setProgressStyle(R.style.NewDialog);
    progressDialog.setMessage("Loading...");

Paste the below in your styles.xml New Dialog :

When you want to show you can cuse progressDialog.show() and to hide you can use progressDialog.dismiss().