這次的主題是封裝RecyclerView的單選多選，現在大家應該都是用的RecyclerView開發列表數據吧。網上也有很多RecyclerView的封裝庫，各種眼花繚亂的功能，這里分享一個我自己項目里用的簡易版RecyclerView 的輕便版封裝吧。

其實這篇博客是我后面一篇博客的準備～一句話實現RecyclerView的單選多選的選項列表

先看圖,這些都是RrcyclerView做的各種樣式的列表數據視圖～

多選樣式圖：

multichoice.jpg

1、封裝通用ViewHolder

        
        public static class VH extends RecyclerView.ViewHolder {
        
        private SparseArray<View> mViews;
        private View mConvertView;

        private VH(View v) {
            super(v);
            mConvertView = v;
            mViews = new SparseArray<>();
        }

        public static VH get(ViewGroup parent, int layoutId) {
            View convertView = LayoutInflater.from(parent.getContext()).inflate(layoutId, parent, false);
            return new VH(convertView);
        }

        public <T extends View> T getView(int id) {
            View v = mViews.get(id);
            if (v == null) {
                v = mConvertView.findViewById(id);
                mViews.put(id, v);
            }
            return (T) v;
        }

        public void setText(int id, String value) {
            TextView view = getView(id);
            view.setText(value);
        }
}

原理就是通過SparseArray<View>存儲item view的控件（不知道SpareseArray的請自行google這個數據結構的Api），getView(int id)的功能就是通過id獲得對應的View：因為findViewById比較耗費性能，首先在mViews中查詢是否存在，如果沒有，那么findViewById()并放入mViews中，避免下次再執行findViewById()。

2、封裝RecyclerView的通用快速開發adapter

public abstract class AbsRecycleAdapter<T> extends RecyclerView.Adapter<AbsRecycleAdapter.VH> {

    private OnItemClickListener mItemClickListener;

    private List<T> mData;

    @Override
    public VH onCreateViewHolder(ViewGroup parent, int viewType) {
        final VH viewHolder = VH.get(parent, getLayoutId(viewType));

        viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int position = viewHolder.getAdapterPosition();
                if (mItemClickListener != null) {
                    mItemClickListener.onItemClick(position, v);
                }
            }
        });
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(VH holder, int position) {
        convert(holder, mData.get(position), position);
    }

    public abstract int getLayoutId(int viewType);

    public abstract void convert(VH holder, T data, int position);

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.mItemClickListener = listener;
    }

    public void setData(List<T> beans) {
        if (null == mData) {
            mData = new ArrayList<>();
        }
        mData.clear();
        if (ValidateUtil.isValidate(beans)) {
            mData.addAll(beans);
        }
    }

    public void addData(List<T> beans) {
        if (null == mData) {
            setData(beans);
        } else {
            mData.addAll(beans);
        }
    }

    public void addData(T t) {
        if (mData == null) {
            mData = new ArrayList<>();
        }
        if (!mData.contains(t)) {
            mData.add(t);
        }
    }

    public void remove(T t) {
        if (null != mData) {
            mData.remove(t);
        }
    }

    public List<T> getData() {
        return mData;
    }

    public void clear() {
        if (mData != null) {
            mData.clear();
        }
    }

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

    public T getItem(int position) {
        if (mData != null) {
            return mData.get(position);
        }
        return null;
    }

    public interface OnItemClickListener {
        void onItemClick(int position, View v);
    }

    public static class VH extends RecyclerView.ViewHolder {
        private SparseArray<View> mViews;
        private View mConvertView;

        private VH(View v) {
            super(v);
            mConvertView = v;
            mViews = new SparseArray<>();
        }

        public static VH get(ViewGroup parent, int layoutId) {
            View convertView = LayoutInflater.from(parent.getContext()).inflate(layoutId, parent, false);
            return new VH(convertView);
        }

        public <T extends View> T getView(int id) {
            View v = mViews.get(id);
            if (v == null) {
                v = mConvertView.findViewById(id);
                mViews.put(id, v);
            }
            return (T) v;
        }

        public void setText(int id, String value) {
            TextView view = getView(id);
            view.setText(value);
        }

        public void setTextColor(int id, @ColorInt int color) {
            TextView view = getView(id);
            view.setTextColor(color);
        }

        public void setTextBackgroundResource(int id, @DrawableRes int resid) {
            TextView view = getView(id);
            view.setBackgroundResource(resid);
        }

        public void setBackgroundResource(int id, @DrawableRes int resId) {
            View view = getView(id);
            view.setBackgroundResource(resId);
        }

        public void setViewShow(int id, boolean isShow) {
            View view = getView(id);
            view.setVisibility(isShow ? View.VISIBLE : View.GONE);
        }

        public void setImageUrl(int id, String imageUrl) {
            ImageView imageView = getView(id);
            Glide.with(itemView.getContext())
                    .load(imageUrl)
                    .placeholder(R.mipmap.banner)
                    .error(R.mipmap.banner)
                    .into(imageView);
        }

        public void setImageResid(int id, int resourceId) {
            ImageView imageView = getView(id);
            imageView.setImageResource(resourceId);
        }

        public void setImageCircleAvatarUrl(int id, String imageUrl) {
            ImageView imageView = getView(id);
            Glide.with(itemView.getContext())
                    .load(imageUrl)
                    .placeholder(R.mipmap.avatar_default)
                    .error(R.mipmap.avatar_default)
                    .bitmapTransform(new GlideCircleTransform(itemView.getContext()))
                    .into(imageView);
        }

    }


}

全部代碼