Unable to create an adapter with custom cards

Question

I'm using the cardslib library for having cards in my Android app. It has pre-defined card layouts or we have an option to customize the layout.

While creating the adapter for recycler view, only the list of card objects with pre-defined card layouts are accepted. I get an error when I try to pass a list of custom cards to the constructor.

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

The above code shows an error. customCards is the list of custom card objects. How do I make it work ?

Error:(53, 127) error: incompatible types: List cannot be converted to List — Anand Kumar, Jul 22 '17 at 12:44

score 0 · Answer 1 · answered Jul 22 '17 at 12:46

0

In your CardArrayRecyclerViewAdapter change List<Card> to List<CustomCard> in the constructor

answered Jul 22 '17 at 12:46

Ajil O.

6,562
5
40
72

The problem is `CardArrayRecyclerViewAdapter` is an in-built adapter in the library. Am I allowed to tweak it? – Anand Kumar Jul 22 '17 at 12:48
Then you have to pass `List` into the adapter. Post more of your code so that someone can find a solution. – Ajil O. Jul 22 '17 at 12:50

score 0 · Answer 2 · answered Jul 22 '17 at 13:20

you can write Custom card adapter bellow

card adapter call just like

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);

custom Adapter

  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

            }
        });



       }

    }
 }

note : CustomCard is model & row_custom_card layout xml where name Textview resde

score 0 · Answer 3 · answered Jul 22 '17 at 13:25

The second argument to the CardArrayRecyclerViewAdapter constructor must be of type List<Card>. I know it seems like List<CustomCard> should work here, but it will not.

It's impossible to say what the best way to solve this problem is without seeing more code, but you could do this:

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

You can read more about why List<CustomCard> is not accepted for the List<Card> argument here Is List<Dog> a subclass of List<Animal>? Why aren't Java's generics implicitly polymorphic?

Unable to create an adapter with custom cards

3 Answers3