Question

我正在使用cardslib库在我的Android应用中拥有卡片。它具有预定义的卡片布局，或者我们可以选择自定义布局。

在为回收器视图创建适配器时，仅接受具有预定义卡布局的卡对象列表。当我尝试将自定义卡列表传递给构造函数时，出现错误。

CardArrayRecyclerViewAdapter cardArrayRecyclerViewAdapter = new CardArrayRecyclerViewAdapter(getApplicationContext(), customCards);

上面的代码显示错误。 customCards是自定义卡片对象的列表。我如何使它工作？

Answer 1

在构建函数中CardArrayRecyclerViewAdapter更改List<Card>到List<CustomCard>

Answer 2

你可以写下自定义卡适配器

卡适配器调用就像

一样

List<CustomCard> cardlist = new ArrayList<>();
recyclerView.setHasFixedSize(true);
// recyclerView
recyclerView.setLayoutManager(new LinearLayoutManager(this));
// create an Object for Adapter
CardDataAdapter  mAdapter = new CardDataAdapter(cardlist);
// set the adapter object to the Recyclerview
recyclerView.setAdapter(mAdapter);

自定义适配器

  class CardDataAdapter extends RecyclerView.Adapter<CardDataAdapter.ViewHolder> {

private List<CustomCard> dataSet;

public CardDataAdapter(List<CustomCard> list) {

    dataSet = list;
}


@Override
public CardDataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    // create a new view
    View itemLayoutView = LayoutInflater.from(viewGroup.getContext()).inflate(
            R.layout.row_custom_card, null);

    itemLayoutView.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT));

    // create ViewHolder

    CardDataAdapter.ViewHolder viewHolder = new CardDataAdapter.ViewHolder(itemLayoutView);

    return viewHolder;
}


@Override
public void onBindViewHolder(CardDataAdapter.ViewHolder viewHolder, int i) {

    CustomCard fp = dataSet.get(i);

    viewHolder.tv_title.setText(fp.getName());


    viewHolder.feed = fp;
}

@Override
public int getItemCount() {

    return dataSet.size();
}

// inner class to hold a reference to each item of RecyclerView
public  class ViewHolder extends RecyclerView.ViewHolder {

    public TextView tv_title;

    public NotificationModel feed;

    public ViewHolder(View itemLayoutView) {
        super(itemLayoutView);

        tv_title = (TextView) itemLayoutView  .findViewById(R.id.tv_title);
        itemLayoutView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

               //Write here

            }
        });



       }

    }
 }

注意：CustomCard是型号＆amp; row_custom_card布局xml，其中名称为Textview resde

Answer 3

CardArrayRecyclerViewAdapter构造函数的第二个参数必须是List<Card>类型。我知道List<CustomCard>似乎应该在这里工作，但事实并非如此。

无法说明解决此问题的最佳方法是在没有看到更多代码的情况下，但您可以这样做：

List<Card> cards = new ArrayList<>();
cards.addAll(customCards);
// now call constructor with `cards` instead of `customCards`

您可以在此处详细了解List<CustomCard>参数List<Card>不接受if ($('.html').data('load-file')) { $(this).load($(this).data("load-file") + ' ' + $(this).data("load-content")); }的原因Is List<Dog> a subclass of List<Animal>? Why aren't Java's generics implicitly polymorphic?

无法使用自定义卡创建适配器

3 个答案: