AlertDialog Does Not Work After Dismiss / Cancel is called?

Question

I have an AlertDialog with 3 radio buttons.The alert is shown when a button is clicked.

I call dialog.dismiss(); when a radio button is selected by the user in the AlertDialog. Here "dialog" is from public void onClick(DialogInterface dialog, int item) {

Now the issue is that I cannot seem to pop up the Alert again after an item has been selected. Suprisingly, on a screen rotation everything seems to work fine again!

I also get the same results (i.e it does not work) when I replace dialog.dismiss(); with dialog.cancel();

Please advice!