How to add a Single choice list to a custom dialog in android?

I would like to add a single choice list to custom dialog I have tried it in different types but I am getting the app crashed with a null pointer error only.I find it can be done only in AlertDialog.Builder format only in many examples.Kindly help me on this with a example.Thanks.

Try this

String x_id;

final String[] arrayOfStrings = first.toArray(new String[first.size()]);

Dialog dialog = new Dialog(Conf_game.this);
dialog.setContentView(R.layout.dialogs);
dialog.setTitle("SELECT Item ");        

final ListView lst = (ListView) dialog.findViewById(R.id.dialog_list);

lst.setAdapter(new ArrayAdapter<String>(this,
        android.R.layout.simple_list_item_checked, android.R.id.text1,
        arrayOfStrings));

lst.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1,
            int item, long arg3) {

        coursetext.setText(arrayOfStrings[item]);

        x_id = arrayOfStrings [item];

        System.out.println(" Value of ID OF ABC OF"
                + arrayOfStrings[item] + "    IS    " + C_id);
        dialog.dismiss();
    }
});

dialog.show();