创建RecycerView时嵌套ArrayList

Question

下面的代码是我的适配器

public class CurriculumAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private Context mContext;
    private ArrayList<Curriculum> mArrayListCurriculum;

    public CurriculumAdapter(Context mContext, ArrayList<Curriculum> mArrayListCurriculum) {
        this.mContext = mContext;
        this.mArrayListCurriculum = mArrayListCurriculum;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_key_features, parent,false);
        return new KeyFeatureViewHolder(v);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        if (holder instanceof KeyFeatureViewHolder) {
            ((KeyFeatureViewHolder) holder).mTextViewFeatureTitle.setText(mArrayListCurriculum.get(position).getTitle());
        }
    }

    @Override
    public int getItemCount() {
        return mArrayListCurriculum == null ? 0 : mArrayListCurriculum.size();
    }

    public static class KeyFeatureViewHolder extends RecyclerView.ViewHolder {

        public TextView mTextViewFeatureTitle;

        public KeyFeatureViewHolder(View itemView) {
            super(itemView);
            mTextViewFeatureTitle = (TextView) itemView.findViewById(R.id.txtFeature);
        }
    }
}

下面的代码是我的片段，带有虚拟arraylist数据

public class CourseCurriculumFragment extends Fragment {

    private FragmentInterface mFragmentInterface;
    private ArrayList<Curriculum> mArrayListCurriculum;
    private ArrayList<Material> mArrayListMaterial;
    private RecyclerView mRecyclerViewCurriculum;
    private LinearLayoutManager mLinearLayoutManager;
    private CurriculumAdapter mCurriculumAdapter;

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_course_curriculum, container, false);
        return view;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        initView(view);
    }

    private void initView(View view) {
        mArrayListMaterial = new ArrayList<>();
        mArrayListCurriculum = new ArrayList<>();
        populateMaterials();
        populateKeyFeatures();

        mRecyclerViewCurriculum = (RecyclerView) view.findViewById(R.id.recyclerViewCurriculum);
        mCurriculumAdapter = new CurriculumAdapter(getActivity(), mArrayListCurriculum);
        mLinearLayoutManager = new LinearLayoutManager(getActivity());
        mRecyclerViewCurriculum.setLayoutManager(mLinearLayoutManager);
        mRecyclerViewCurriculum.setAdapter(mCurriculumAdapter);
        mRecyclerViewCurriculum.setItemAnimator(new DefaultItemAnimator());
    }

    private void populateMaterials() {
        mArrayListMaterial.add(new Material("12:00","pdf","","Sample Text","0"));
        mArrayListMaterial.add(new Material("12:00","pdf","","Sample Text","0"));
    }

    private void populateKeyFeatures() {
        mArrayListCurriculum.add(new Curriculum("UNIT 1",mArrayListMaterial));
        mArrayListCurriculum.add(new Curriculum("UNIT 2",mArrayListMaterial));
        mArrayListCurriculum.add(new Curriculum("UNIT 3",mArrayListMaterial));
    }
}

Answer 1

holder中的bind方法是向其传递数据的好方法。

在您的示例中，bind方法应该接受currore和Material对象作为参数。

在适配器的onBindViewholder方法中，不应该触及holder的变量，而应该调用这个Bind方法。

在youKeyFeatureViewholder类中实现该方法时，应该使用这些传递的参数，并在适当的UI元素中显示它们。

最后，要将Material对象数据放入适配器中，请添加ArrayList 作为构造函数参数，就像使用Currucle一样。