如何在手机旋转时保持 dialogFragment

同志们好。有一个fragment dialog（一个单独的类）是通过接口创建的，通过点击listView中的一个item（点击在adapter中处理，在activity中调用接口）。数据被传递到这个对话框（用于编辑和保存到数据库）。旋转手机时如何保存对话框的状态？更准确地说，我像这样保存对话框本身的状态：

@Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        if (builder != null) {
            savedInstanceState.putBoolean("showDialog", true);
            savedInstanceState.putString("id", String.valueOf(id));
            savedInstanceState.putString("key", key);
            if (!String.valueOf(posTextView.getText()).equals("")) {
                savedInstanceState.putDouble("posTextView", Double.parseDouble(String.valueOf(posTextView.getText())));
            } else {
                savedInstanceState.putDouble("posTextView", 0);
            }
            if (!String.valueOf(priceTextView.getText()).equals("")) {
                savedInstanceState.putDouble("priceTextView", Double.parseDouble(String.valueOf(priceTextView.getText())));
            } else {
                savedInstanceState.putDouble("priceTextView", 0);
            }
            savedInstanceState.putLong("dateLong", resultDate);
        } else {
            savedInstanceState.putBoolean("showDialog", false);
        }
    }

我恢复

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    setRetainInstance(true);
    if (savedInstanceState != null && savedInstanceState.getBoolean("showDialog")) {
        this.id= savedInstanceState.getInt("id");
        this.key= savedInstanceState.getString("key");
        this.quantity = savedInstanceState.getDouble("posTextView");
        this.price = savedInstanceState.getDouble("priceTextView");
        this.dateLong = savedInstanceState.getLong("dateLong");
    }

旋转后如何在活动中调用包含此数据的对话框？除非旧的已关闭，否则不会创建新的。对话框构造函数（即使在恢复数据后也需要上下文，否则为 nullPointerException）

 public EditPortfolioDialogFragment newInstance(Integer id, String key, double quantity, double price, long dateLong,
                                                   boolean buy, Context context, PortfolioItemSaveListener portfolioItemSaveListener) {
        EditPortfolioDialogFragment dialogFragment = new EditPortfolioDialogFragment();

        this.coinId = id;
        if (key != null) {
            this.key = key;
            this.oldKey = key;
        } else {
            this.key = "abc";
        }
        this.quantity = quantity;
        this.price = price;
        this.dateLong = dateLong;

        this.context = context;
        this.portfolioItemSaveListener = portfolioItemSaveListener;
        return dialogFragment;
    }