DataBinding下的RecycleView适配器Adapter基类

public abstract class BaseAdapter<T, B extends ViewDataBinding>
        extends RecyclerView.Adapter<BaseViewHolder> {

    private final ObservableList<T> mData;

    public BaseAdapter() {
        this(new ObservableArrayList<>());
    }

    public BaseAdapter(@NonNull ObservableList<T> dataList) {
        mData = dataList;
        mData.addOnListChangedCallback(new ObservableList.OnListChangedCallback<ObservableList<T>>() {

            @Override
            public void onChanged(ObservableList<T> sender) {
                notifyDataSetChanged();
            }

            @Override
            public void onItemRangeChanged(ObservableList<T> sender, int positionStart, int itemCount) {
                notifyItemRangeChanged(positionStart, itemCount);
            }

            @Override
            public void onItemRangeInserted(ObservableList<T> sender, int positionStart, int itemCount) {
                notifyItemRangeInserted(positionStart, itemCount);
            }

            @Override
            public void onItemRangeMoved(ObservableList<T> sender, int fromPosition, int toPosition, int itemCount) {
                notifyItemMoved(fromPosition, toPosition);
            }

            @Override
            public void onItemRangeRemoved(ObservableList<T> sender, int positionStart, int itemCount) {
                notifyItemRangeRemoved(positionStart, itemCount);
            }
        });
    }

    public void setData(List<T> data) {
        mData.clear();
        addData(data);
    }

    public void addData(List<T> data) {
        if (data != null && data.size() > 0) {
            mData.addAll(data);
        }
    }

    public @NonNull List<T> getData() {
        int size = getItemCount();
        List<T> resList = new ArrayList<>(size);
        if (size > 0) {
            resList.addAll(mData);
        }
        return resList;
    }

    public void updateItem(T item) {
        int index = mData.indexOf(item);
        if (index > -1) {
            mData.set(index, item);
        }
    }

    @NonNull
    @Override
    public BaseViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        B binding = DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()),
                getItemLayoutId(), parent, false);
        return new BaseViewHolder(binding.getRoot());
    }

    @Override
    public void onBindViewHolder(@NonNull BaseViewHolder holder, int position) {
        B binding = DataBindingUtil.getBinding(holder.itemView);
        onBindItem(mData.get(position), binding);
    }

    @Override
    public int getItemCount() {
        return mData.size();
    }

    /**
     * 获取item项布局资源id
     * @return 布局资源id
     */
    public abstract @LayoutRes int getItemLayoutId();

    /**
     * 绑定数据
     * @param item 数据项
     * @param binding 绑定
     */
    public abstract void onBindItem(T item, B binding);
}

其中

public final class BaseViewHolder extends RecyclerView.ViewHolder {

    public BaseViewHolder(@NonNull View itemView) {
        super(itemView);
    }
}