RecyclerView 通用适配器

 原文地址：https://www.jianshu.com/p/82a74c9ccba5

public abstract class RVBaseAdapter<T> extends RecyclerView.Adapter<RVBaseAdapter.CommonViewHolder> {

    protected List<T> mBeans;
    protected Context mContext;

    public static final int TYPE_NORMAL = 0; //说明是不带有header和footer的
    public static final int TYPE_HEADER = -1; //说明是带有Header的
    public static final int TYPE_FOOTER = -2; //说明是带有Footer的

    //HeaderView, FooterView
    private boolean mHaveHeader;
    private boolean mHaveFooter;

    public RVBaseAdapter(Context context, List<T> beans, boolean haveHead, boolean haveFoot) {
        mContext = context;
        mBeans = beans;
        mHaveHeader = haveHead;
        mHaveFooter = haveFoot;
    }

    public RVBaseAdapter(Context context, List<T> beans, boolean haveHead) {
        mContext = context;
        mBeans = beans;
        mHaveHeader = haveHead;
    }

    public RVBaseAdapter(Context context, List<T> beans) {
        mContext = context;
        mBeans = beans;
    }

    @Override
    public RVBaseAdapter.CommonViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        View view = inflater.inflate(getItemLayoutID(viewType), parent, false);
        final CommonViewHolder holder = new CommonViewHolder(view);
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onItemClick(holder.getAdapterPosition());
            }
        });
        onCreateClickListener(holder, viewType);
        return holder;
    }

    @Override
    public void onBindViewHolder(RVBaseAdapter.CommonViewHolder holder, int position) {
        if(getItemViewType(position) == TYPE_HEADER){
            onBindDataToView(holder, null);
        }else if(getItemViewType(position) == TYPE_FOOTER){
            onBindDataToView(holder, null);
        }else{
            if(mHaveHeader){
                onBindDataToView(holder, mBeans.get(position-1));
            }else{
                onBindDataToView(holder, mBeans.get(position));
            }
        }
    }

    /**
     * 为一些控件设置点击监听器
     * @param holder
     */

    protected abstract void onCreateClickListener(CommonViewHolder holder, int viewType);

    /**
     * 绑定数据到Item的控件中去     *
     * @param holder
     * @param bean
     */
    protected abstract void onBindDataToView(CommonViewHolder holder, T bean);
    /**
     * 取得ItemView的布局文件     *
     * @return
     */
    public abstract int getItemLayoutID(int viewType);

    @Override
    public int getItemCount() {
        int listSize = mBeans.size();
        if(mHaveHeader){
            listSize++;
        }
        if(mHaveFooter){
            listSize++;
        }
        return listSize;
    }

//    @Override
//    public int getItemViewType(int position) {
//        if (position == 0 && mHaveHeader){
//            //第一个item应该加载Header
//            return TYPE_HEADER;
//        }
//        if (position == getItemCount()-1 && mHaveFooter){
//            //最后一个,应该加载Footer
//            return TYPE_FOOTER;
//        }
//        return TYPE_NORMAL;
//    }

    public void add(T bean) {
        mBeans.add(bean);
        notifyDataSetChanged();
    }

    public void addAll(List<T> beans) {
        mBeans.addAll(beans);
        notifyDataSetChanged();
    }

    public void clear() {
        mBeans.clear();
        notifyDataSetChanged();
    }

    public class CommonViewHolder extends RecyclerView.ViewHolder {
        private final SparseArray<View> mViews;
        private View itemView;

        public CommonViewHolder(View itemView) {
            super(itemView);
            this.mViews = new SparseArray<>();
            this.itemView = itemView;
        }

        public View getItemView() {
            return itemView;
        }

        public <T extends View> T getView(int viewId) {
            View view = mViews.get(viewId);
            if (view == null) {
                view = itemView.findViewById(viewId);
                mViews.put(viewId, view);
            }
            return (T) view;
        }

        public void setViewVisibility(int viewId, int visibilityType){
            View view = getView(viewId);
            if(view != null){
                view.setVisibility(visibilityType);
            }
        }

        public void setText(int viewId, String text) {
            TextView tv = getView(viewId);
            if(tv != null){
                tv.setText(text);
            }
        }

        /**
         * 加载drawable中的图片
         *
         * @param viewId
         * @param resId
         */
        public void setImage(int viewId, int resId) {
            ImageView iv = getView(viewId);
            iv.setImageResource(resId);
        }

        /**
         * 加载网络上的图片
         *
         * @param viewId
         * @param url
         */
        public void setImageByGlide(int viewId, String url) {
            ImageView iv = getView(viewId);
            Glide.with(mContext)
                    .load(url)
                    .dontAnimate()
                    .fitCenter()
                    .diskCacheStrategy(DiskCacheStrategy.SOURCE)
//                        .crossFade()//或者使用 dontAnimate() 关闭动画
                    .placeholder(R.drawable.picture_demo)
                    .error(R.drawable.picture_demo)
                    .into(iv);
        }
        public void setImageByImageLoader(int viewId, String url) {
            ImageView iv = getView(viewId);
            ImageLoader.getInstance().displayImage(url, iv);
        }
    }

    /**
     * ItemView的单击事件(如果需要，重写此方法就行)
     *
     * @param position
     */
    protected abstract void onItemClick(int position);

}