Question

我有像Car，Home适配器这样的特定类，它们都扩展到Adapter类，我将它们的实例传递给setAdapterForList方法，但是，所有类都有自己的特殊方法，比如buyCar，getHome。

我想要做的是，通过在var valArray = new[] { "Val0", "Val1", "Val2", "Val3" };方法

中输入类型，将这些适配器强制转换为类

var valArray = new[] { "Val0", "Val1", "Val2", "Val3" };
var source = "hello{1}from{2}my{3}world";
var substr = source;
string pattern = $"{Regex.Escape(start)}{".+?"}{Regex.Escape(end)}";

foreach (Match m in Regex.Matches(source, pattern))
{
    var value = m.Groups[0].Value;
    var ind = Convert.ToInt32(m.Groups[0].Value.TrimStart(start.ToCharArray()).TrimEnd(end.ToCharArray()));
    substr = substr.Replace(value, valArray[ind]);
}
return substr;

这就是我想做的事，

setAdapterForList

Answer 1

我不知道是否可以自动完成。但手动你可以这样做：

public class GameFragment extends Fragment {
    private Theme currentTheme;
    private Circle currentCircle;
    private int currentOrganisationId;
    private List<Card> circleCards;
    private List<ImageButton> circleButtons;
    private int viewHeight;
    private int viewWidth;
    private int marginCard;
    private int[] tableStarts;
    private RelativeLayout background;
    private ViewTreeObserver vto;

    public GameFragment() {
        circleCards = new ArrayList<>();
        circleButtons = new ArrayList<>();
        tableStarts = new int[9];
    }

    //...

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        final ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_game, container, false);
        ...
        background = setBackground(rootView);
        circleCards = currentCircle.getCards();

        return rootView;
    }

    //...

    private void drawCards() {
        circleButtons = new ArrayList<>();
        for (Card card : circleCards) {
            ImageButton myImageButton = new ImageButton(this.getContext()); //generate ImageButton
            myImageButton.setId(card.getCardId()); //Set Id of button
            myImageButton.setBackgroundResource(R.drawable.circle_card_icon);

            //set random color to shape
            ...
        }
    }
}

Answer 2

您可以使用instanceof来检查它是一个还是另一个

public void setAdapterForList(Adapter adapter) {
  if (adapter instanceof Car) {
      Car c = (Car)adapter;
      // stuff
      return;
  }
  if (adapter instanceof Home) {
      Home h = (Home)adapter;
      // stuff
      return;
  }
  // and so on...
}

如何将父类型类转换为自习类

2 个答案: