view binding 형태 adapter

Example.java

List<Data> list = new ArrayList<>();

HspAdapter<Data> adapter = new HspAdapter<>("your_row");
adapter.setItems(list);
adapter.setViewModel(model);

binding.recycler.setAdapter(adapter); 

// 끝

HspAdapter.java

public class HspAdapter<ITEM> extends RecyclerView.Adapter<HspViewHolder> {
    private static final Logger mLog = LoggerFactory.getLogger(HspAdapter.class);

    private List<ITEM> mItems;
    private ViewModel mViewModel;
    private String[] mLayouts;

    public HspAdapter(@NonNull String layoutId) {
        mLayouts = new String[] { layoutId };
    }

    public HspAdapter(@NonNull String[] layoutIds) {
        mLayouts = layoutIds;
    }

    @NonNull
    @Override
    public HspViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        Context context = parent.getContext();
        int layoutId    = context.getResources().getIdentifier(mLayouts[viewType], "layout", context.getPackageName());
        View view       = LayoutInflater.from(context).inflate(layoutId, parent, false);

        if (mLog.isDebugEnabled()) {
            mLog.debug(String.format(Locale.getDefault(), "LAYOUT ID : %s (%d)", mLayouts[viewType], layoutId));
        }

        try {
            ViewDataBinding binding;
            String bindingClassPath = bindClassName(context, mLayouts[viewType]);

            if (mLog.isDebugEnabled()) {
                mLog.debug("BINDING CLASS : " + bindingClassPath);
            }

            Class<?> bindingClass = Class.forName(bindingClassPath);
            Method method = bindingClass.getDeclaredMethod("bind", new Class<?>[]{ View.class });
            binding = (ViewDataBinding) method.invoke(null, new Object[] { view });

            HspViewHolder vh = new HspViewHolder(view);
            vh.mBinding = binding;

            return vh;
        } catch (Exception e) {
            e.printStackTrace();
            mLog.error("ERROR: " + e.getMessage());
            return null;
        }
    }

    @Override
    public void onBindViewHolder(@NonNull HspViewHolder holder, int position) {
        if (mViewModel != null) {
            invokeMethod(holder.mBinding, "setModel", mViewModel.getClass(), mViewModel);
        }

        if (mItems != null) {
            ITEM item = mItems.get(position);
            invokeMethod(holder.mBinding, "setItem", item.getClass(), item);
        }

        holder.mBinding.executePendingBindings();
    }

    @Override
    public int getItemCount() {
        if (mItems == null) {
            return 0;
        }

        return mItems.size();
    }

    @Override
    public int getItemViewType(int position) {
        if (mItems == null) {
            return 0;
        }

        ITEM item = mItems.get(position);
        if (item instanceof IHspItem) {
            return ((IHspItem) item).type();
        }

        return 0;
    }

    public void setItems(List<ITEM> items) {
        mItems = items;
    }

    public void setViewModel(ViewModel model) {
        mViewModel = model;
    }

    private static String bindClassName(@NonNull Context context, @NonNull String layoutId) {
        StringBuilder sb = new StringBuilder();

        sb.append(context.getPackageName());
        sb.append(".databinding.");
        sb.append(Character.toUpperCase(layoutId.charAt(0)));

        for (int i = 1; i < layoutId.length(); ++i) {
            char c = layoutId.charAt(i);

            if (c == '_') {
                c = layoutId.charAt(++i);
                sb.append(Character.toUpperCase(c));
            } else {
                sb.append(c);
            }
        }

        sb.append("Binding");

        return sb.toString();
    }

    private static void invokeMethod(ViewDataBinding binding, String methodName, Class<?> argType, Object argValue) {
        try {
            Method method = binding.getClass().getDeclaredMethod(methodName, new Class<?>[] { argType });
            method.invoke(binding, new Object[] { argValue });
        } catch (Exception e) {
            e.printStackTrace();
            mLog.error("ERROR: " + e.getMessage());
        }
    }
}

HspViewHolder.java

public class HspViewHolder extends RecyclerView.ViewHolder {
    public ViewDataBinding mBinding;

    public HspViewHolder(View itemView) {
        super(itemView);
    }
}