So I was hoping to be clever by creating an abstract class called SearchableModel which looks like this:
public abstract class SearchableModel {
public abstract String getId();
public abstract String getName();
}
And then creating one RecyclerViewAdapter that would work for any class extending this abstract one. My concrete class looks like this:
public class School extends SearchableModel{
@SerializedName("external_school_id")
private String id;
@SerializedName("name")
private String name;
@Override
public String getId() {
return id;
}
@Override
public String getName() {
return id;
}
}
And the RecyclerViewAdapter is like this:
public class SearchableItemAdapter extends RecyclerView.Adapter<SearchableItemAdapter.ViewHolder> {
private List<SearchableModel> items;
public SearchableItemAdapter(List<SearchableModel> items) {
this.items = items;
}
@Override
public SearchableItemAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list, parent);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(SearchableItemAdapter.ViewHolder holder, int position) {
SearchableModel item = items.get(position);
holder.nameText.setText(item.getName());
}
@Override
public int getItemCount() {
return items.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder{
@BindView(R.id.text_list_name)
TextView nameText;
public ViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
}
My thought was that I would simply be able to define a List<School> schools and then apply it to the adapter in the constructor using new SearchableItemAdapter(schools). However when I try this I get the following error:
Incompatible Types. Required List<SearchableModel>. Found List<School>
My understanding is since School extends SearchableModel it should be able to be used in place of it. Am I completely off base in the way inheritance works in Java or is there something else going on here?
