Android databinding RecyclerView 万能适配器

DataBindingRecyclerViewAdapter.java

public class DataBindingRecyclerViewAdapter extends RecyclerView.Adapter<DataBindingRecyclerViewAdapter.DataBindingViewHolder> {

    public static final int TYPE_HEADER = 1, TYPE_FOOTER = 2, TYPE_NORMAL = 0;
    public OnBindingViewHolderListener onBindingViewHolderListener;
    Context mContext;
    int mLayoutId;
    int mVarId;
    boolean haveHeader = false;
    boolean haveFooter = false;
    View headerView, footerView;
    private List mData;
    private ItemClickListener itemClickListener;

    public DataBindingRecyclerViewAdapter(Context context, int layoutId, int varId, List data) {
        mContext = context;
        mLayoutId = layoutId;
        mVarId = varId;
        mData = data;
    }

    public void setOnItemCkickListener(ItemClickListener listener) {
        this.itemClickListener = listener;
    }

    public void setOnBindingViewHolderListener(OnBindingViewHolderListener listener) {
        onBindingViewHolderListener = listener;
    }

    @Override
    public DataBindingViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType) {
            case TYPE_HEADER:
                return new DataBindingViewHolder(headerView, viewType);
            case TYPE_FOOTER:
                return new DataBindingViewHolder(footerView, viewType);
            case TYPE_NORMAL:
            default:
                return new DataBindingViewHolder(LayoutInflater.from(mContext).inflate(mLayoutId, parent, false), viewType);
        }
    }

    @Override
    public void onBindViewHolder(final DataBindingViewHolder holder, final int position) {

        switch (holder.viewType) {
            case TYPE_HEADER:
                break;
            case TYPE_FOOTER:
                break;
            case TYPE_NORMAL:
            default:
                ViewDataBinding binding = DataBindingUtil.bind(holder.itemView);
                Object data;
                if (haveHeader) {
                    data = mData.get(position - 1);
                } else {
                    data = mData.get(position);
                }

                if (itemClickListener != null) {
                    holder.itemView.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            itemClickListener.itemClick(holder.itemView, position);
                        }
                    });
                }

                binding.setVariable(mVarId, data);
                binding.executePendingBindings();
                if (onBindingViewHolderListener != null) {
                    onBindingViewHolderListener.onHolderBinding(holder, position);
                }

                break;
        }

    }

    /**
     * 调用之后请调用NotifyDataSetChange 如果在setAdapter之后
     *
     * @param view
     */
    public void addFooterView(View view) {
        haveFooter = true;
        footerView = view;
    }

    /**
     * 调用之后请调用NotifyDataSetChange 如果在setAdapter之后
     *
     * @param view
     */
    public void addHeaderView(View view) {
        haveHeader = true;
        headerView = view;
    }

    public void removeFooterView() {
        footerView = null;
        haveFooter = false;
    }

    public View getFooterView() {
        return footerView;
    }

    public void cleanData() {
        mData.clear();
        notifyDataSetChanged();
    }

    public List getAllData() {
        return mData;
    }

    public void addData(List data) {
        mData.addAll(data);
        notifyDataSetChanged();
    }

    @Override
    public int getItemCount() {
        int extraCount = 0;
        if (haveHeader) {
            extraCount++;
        } else if (haveFooter) {
            extraCount++;
        }
        return mData.size() + extraCount;
    }

    @Override
    public int getItemViewType(int position) {
        if (position == 0 && haveHeader) {
            return TYPE_HEADER;
        } else if (position == mData.size() && haveFooter) {
            return TYPE_FOOTER;
        } else {
            return TYPE_NORMAL;
        }
    }

    public interface ItemClickListener {
        void itemClick(View view, int position);
    }

    public interface OnBindingViewHolderListener {
        void onHolderBinding(DataBindingViewHolder holder, int position);
    }

    public class DataBindingViewHolder extends RecyclerView.ViewHolder {

        int viewType;

        public DataBindingViewHolder(View itemView, int viewType) {
            super(itemView);
            this.viewType = viewType;
        }
    }
}