我有一个AlertDialog将数组显示为单个选择的选项：

    protected boolean blFrom, blTo;
protected void showSelectToDialog() {
    boolean[] checkedDate = new boolean[toDate.length];
    int count = toDate.length;

    DialogInterface.OnClickListener setD2 = new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            //TODO Auto-generated method stub
            onChangeSelectedTo(which);
        }
    };

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("Select To Year");
    builder.setSingleChoiceItems(toDate, count, setD2);

    builder.setCancelable(true);
    builder.setPositiveButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            dialog.dismiss();
        }
    });
    dialog2 = builder.create();
    dialog2.show();
}

protected void onChangeSelectedTo(int j) {
    bTo.setText(toDate[j]);
    sTo = ((AlertDialog)dialog2).getListView().getCheckedItemPosition();
    blTo = true;
    displayToast(String.valueOf(sTo));
    to = j;
    dialog.dismiss();
}

我想做的是它第一次加载时应显示默认值。选择一个选项并关闭对话框后，我再次弹出相同的对话框，它应显示我先前做出的选择并滚动到该对话框。

我该如何完成？

截至目前，我可以获取所选职位，但是接下来该怎么办？