Kill Activity on Dialog Back Button

I have a dialog that pops up in my activity. I want it to f开发者_StackOverflow中文版inish the entire activity when the back button is pressed on the dialog. How would I do this?

set the onCancelListener for the dialog and call finish() when its called.

setOnCancelListener(new OnCancelListener() 
{
    @Override
    public void onCancel(DialogInterface dialog) {
      removeDialog(DIALOG_ALERT);
      finish();
    }
})