这次对RecylcerView的adapter经行封装，以减少重复代码的调用。

实现的功能：

• 返回统一数据的点击事件
• 多条目布局
• 统一的图片加载
• 极度简洁的调用流程

普通使用：

adapter代码只需要

public class MyTaskAdapter extends BaseAdapter<MyTaskModel> {

    public MyTaskAdapter(Context context) {
        super(context, R.layout.item_mytask_fragment);
    }


    @Override
    protected void bindData(ViewHolder holder, MyTaskModel item) {
        holder.setText(R.id.task_end_tv,item.getLateEndTime());
        holder.setText(R.id.task_start_tv,item.getAssignTime());
        holder.setText(R.id.task_no_tv,item.getTaskId());
        holder.setText(R.id.task_title_tv,item.getTaskName());
        holder.setText(R.id.task_state_tv,item.getTaskStatus()+"");
    }
}

多条目布局

 mRecyclerView = findViewById(R.id.recycler);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        TalkAdapter mTalkAdapter=new TalkAdapter(this, new OnItemViewSupport<TalkBean>() {
            @Override
            public int getSupportItemView(TalkBean item) {
                if(item.getId()==1){
                    return R.layout.item_me;
                }else if(item.getId()==2){
                    return R.layout.item_friends;
                }
                return 0;
            }
        });

        mRecyclerView.setAdapter(mTalkAdapter);

        mTalkAdapter.setOnItemClickListener(new OnItemClickListener<TalkBean>() {
            @Override
            public void onItemClick(TalkBean item, int position) {

            }
        });

public class TalkAdapter extends BaseAdapter<TalkBean> {

    public TalkAdapter(Context context, OnItemViewSupport<TalkBean> itemSupport) {
        super(context, itemSupport);
    }

    @Override
    protected void bindData(ViewHolder holder, TalkBean item) {
        if(item.getId()==1){
            holder.setText(R.id.me,item.getText());
        }else if(item.getId()==2){
            holder.setText(R.id.frident,item.getText());
        }
    }
}

设置图片，可以直接设置资源文件或者网络图片

@Override
    protected void bindData(ViewHolder holder, TestBean item) {

            holder.setText(R.id.me,item.getText());

            //网络图片
            holder.setImage(R.id.image, new MyImageLoader(item.getPath()));

            //资源文件
            holder.setImageResource(R.id.image,R.mipmap.ic_launcher);

    }

这里需要建一个类MyImageLoader，可以使用任意加载图片的框架

public class MyImageLoader extends ViewHolder.ImageLoader {
    public MyImageLoader(String path) {
        super(path);
    }
    @Override
    protected void loadImage(ImageView imageView, String path) {
        Glide.with(context).load(path)
                .error(R.mipmap.ic_no_data)
                .into(imageView);
    }
}

是不是非常简洁。

下面封装的代码如下

BaseAdapter

public abstract class BaseAdapter<T> extends RecyclerView.Adapter<ViewHolder> {

    private Context mContext;
    private List<T> mDats=new ArrayList<>();
    private int mLayoutId;
    private LayoutInflater mInflater;
    private OnItemViewSupport mItemSupport;
    private OnItemClickListener<T> clickListener;

    //正常布局
    public BaseAdapter(Context context, int layoutId){
        mContext=context;
        mLayoutId= layoutId;
        mInflater = LayoutInflater.from(context);
    }

    public void addDatas(List<T> datas){
        mDats.addAll(datas);
    }

    public void setDatas(List<T> datas){
        mDats=datas;
    }

    //多布局调用这个
    public BaseAdapter(Context context, OnItemViewSupport<T> itemSupport){
        this(context ,0);
        mItemSupport=itemSupport;
    }

    //dia

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if(mItemSupport!=null){
            mLayoutId=viewType;
        }
        return new ViewHolder(mInflater.inflate(mLayoutId,parent,false));
    }


    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        final T item = mDats.get(position);
        bindData(holder, item);
        if(clickListener!=null){
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    clickListener.onItemClick(item,position);
                }
            });

        }
    }

    protected abstract void bindData(ViewHolder holder, T item);


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



    @Override
    public int getItemViewType(int position) {
        //处理多布局
        if (mItemSupport!=null){
            return mItemSupport.getSupportItemView(mDats.get(position));
        }
        return super.getItemViewType(position);
    }

    public void setOnItemClickListener(OnItemClickListener<T> clickListener){

        this.clickListener = clickListener;
    }

}

条目点击的监听事件

public interface OnItemClickListener<T> {

    void onItemClick(T item, int position);
}

多条目支持的接口

public interface OnItemViewSupport<T> {

    int getSupportItemView(T item);
}

ViewHolder

public class ViewHolder extends RecyclerView.ViewHolder {
    private SparseArray<View> mViews;
    public ViewHolder(View itemView) {
        super(itemView);
        mViews=new SparseArray();
    }

    /**
     * 获取View方法
     * @param id
     * @param <T>
     * @return
     */
    public <T extends View> T getView(@IdRes int id){
        View view= mViews.get(id);

        if(view==null){
            view =itemView.findViewById(id);
            mViews.put(id,view);
        }

        return (T) view;
    }

    /**
     * 设置文本
     */
    public ViewHolder setText(@IdRes int id, CharSequence text){
        TextView textView = getView(id);
        if(TextUtils.isEmpty(text)){
            textView.setText("");
        }else{
            textView.setText(text);
        }

        return this;
    }



    /**
     * 设置图片
     */
    public ViewHolder setImageResource(@IdRes int id, @DrawableRes int resId){
        ImageView view = getView(id);
        view.setImageResource(resId);
        return this;
    }

    /**
     * 设置网络图片
     */

    public ViewHolder setImage(@IdRes int id, ImageLoader loader){
        ImageView view = getView(id);
        loader.loadImage(view,loader.mPath);
        return this;
    }

    /**
     * 解耦图片处理
     */
    public abstract static class ImageLoader{
        String mPath;
        public ImageLoader(String path){
            this.mPath=path;
        }

        protected abstract void loadImage(ImageView imageView, String path);
    }
}

github地址：https://github.com/livesun/RecyclerViewBaseAdaoter