I am overriding the onCreateDialog and onPrepareDialog methods or the Dialog class.

I have followed the example from Reto Meier's Professional Android Application Development book, Chapter 5 to pull some XML data and then use a dialog to display the info.

I have basically followed it exactly but changed the variables to suit my own XML schema as follows:

@Override
public Dialog onCreateDialog(int id) {
  switch(id) {
    case (SETTINGS_DIALOG) :        
      LayoutInflater li = LayoutInflater.from(this);
      View settingsDetailsView = li.inflate(R.layout.details, null);

      AlertDialog.Builder settingsDialog = new AlertDialog.Builder(this);
      settingsDialog.setTitle("Provisioned Settings");         
      settingsDialog.setView(settingsDetailsView);
      return settingsDialog.create();
  }
  return null;
}

@Override
public void onPrepareDialog(int id, Dialog dialog) {
  switch(id) {
    case (SETTINGS_DIALOG) :                  

        String afpunText = "  ";

        if(setting.getAddForPublicUserNames() == 1){
            afpunText = "Yes";
        }
        else{
            afpunText = "No";
        }
      String Text = "Login Settings: " + "\n" 
                       + "Password: " + setting.getPassword()  + "\n" 
                       + "Server: " + setting.getServerAddress() + "\n";


      AlertDialog settingsDialog = (AlertDialog)dialog; 
      settingsDialog.setTitle(setting.getUserName());

      tv = (TextView)settingsDialog.findViewById(R.id.detailsTextView);
      if (tv != null)
        tv.setText(Text);

      break;
  }
}

It works fine until I try changing the screen orientation, When I do this onPrepareDialog gets call but I get null pointer exceptions on all my variables.

The error still occurs even when I tell my activity to ignore screen orientation in the manifest.

So I presume something has been left out of the example in the book do I need to override another method to save my variables in or something?