每天记录学习的新知识 ：鸿洋的RecyclerView BaseAdapter

参考地址

Github地址：https://github.com/hongyangAndroid/baseAdapter

Android 万能的Adapter for ListView,RecyclerView,GridView等，支持多种Item类型的情况。

使用

    implementation 'com.zhy:base-rvadapter:3.0.3'

展示普通列表

使用方式

mRecyclerView.setAdapter(new CommonAdapter<String>(this, R.layout.item_list, mDatas)
{
    @Override
    public void convert(ViewHolder holder, String s)
    {
        holder.setText(R.id.id_item_list_title, s);
    }
});

例

    class MainAdapter extends CommonAdapter<RcBean> {

        public MainAdapter(Context context, int layoutId, List<RcBean> datas) {
            super(context, layoutId, datas);
        }

        @Override
        protected void convert(ViewHolder holder, RcBean rcBean, int position) {
            holder.setText(R.id.id_item_list_title, rcBean.getTitle());
            holder.setText(R.id.id_item_list_msg, rcBean.getMsg());
        }
    }

recyclerView.setAdapter(new MainAdapter(this, R.layout.item_list, rcBeanList));

除此，Adapter提供Item点击的事件

        adapter.setOnItemClickListener(new MultiItemTypeAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, RecyclerView.ViewHolder holder, int position) {

            }

            @Override
            public boolean onItemLongClick(View view, RecyclerView.ViewHolder holder, int position) {
                return false;
            }
        });

具体到某一个控件的点击，需要自己在 @Override protected void convert 内监听。

展示多种类型的Item列表

使用方法

MultiItemTypeAdapter adapter = new MultiItemTypeAdapter(this,mDatas);
adapter.addItemViewDelegate(new MsgSendItemDelagate());
adapter.addItemViewDelegate(new MsgComingItemDelagate());

public class MsgComingItemDelagate implements ItemViewDelegate<ChatMessage>
{

    @Override
    public int getItemViewLayoutId()
    {
        return R.layout.main_chat_from_msg;
    }

    @Override
    public boolean isForViewType(ChatMessage item, int position)
    {
        return item.isComMeg();
    }

    @Override
    public void convert(ViewHolder holder, ChatMessage chatMessage, int position)
    {
        holder.setText(R.id.chat_from_content, chatMessage.getContent());
        holder.setText(R.id.chat_from_name, chatMessage.getName());
        holder.setImageResource(R.id.chat_from_icon, chatMessage.getIcon());
    }
}

例

        MultiItemTypeAdapter adapter = new MultiItemTypeAdapter(this, rcBeanList);
        adapter.addItemViewDelegate(new MsgSendItemDelagate());
        adapter.addItemViewDelegate(new MsgComingItemDelagate());
        recyclerView.setAdapter(adapter);

    public class MsgComingItemDelagate implements ItemViewDelegate<RcBean> {

        @Override
        public int getItemViewLayoutId() {
            return R.layout.item_list;
        }

        @Override
        public boolean isForViewType(RcBean item, int position) {
            return item.isComMeg();
        }

        @Override
        public void convert(ViewHolder holder, RcBean rcBean, int position) {
            holder.setText(R.id.id_item_list_title, rcBean.getTitle());
            holder.setText(R.id.id_item_list_msg, rcBean.getMsg());
        }
    }

    public class MsgSendItemDelagate implements ItemViewDelegate<RcBean> {

        @Override
        public int getItemViewLayoutId() {
            return R.layout.item_list_send_msg;
        }

        @Override
        public boolean isForViewType(RcBean item, int position) {
            return !item.isComMeg();
        }

        @Override
        public void convert(ViewHolder holder, RcBean rcBean, int position) {
            holder.setText(R.id.tv_text, rcBean.getDesc());
        }
    }

其中，@Override public boolean isForViewType用于标识，使用哪种Delegate。

    public int getItemViewType(T item, int position)
    {
        int delegatesCount = delegates.size();
        for (int i = delegatesCount - 1; i >= 0; i--)
        {
            ItemViewDelegate<T> delegate = delegates.valueAt(i);
            if (delegate.isForViewType( item, position))
            {
                return delegates.keyAt(i);
            }
        }
        throw new IllegalArgumentException(
                "No ItemViewDelegate added that matches position=" + position + " in data source");
    }

通过@Override public boolean isForViewType的调用，Adapter就可以知道使用哪种布局。

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        ItemViewDelegate itemViewDelegate = mItemViewDelegateManager.getItemViewDelegate(viewType);//here
        int layoutId = itemViewDelegate.getItemViewLayoutId();
        ViewHolder holder = ViewHolder.createViewHolder(mContext, parent, layoutId);
        onViewHolderCreated(holder,holder.getConvertView());
        setListener(parent, holder, viewType);
        return holder;
    }

ItemViewDelegate 作用是将布局抽出，在使用的地方现取。

添加HeaderView、FooterView

如果你的需求，需要你添加一键已读的功能？这个需求对应的就是HeaderView。

使用方法

mLoadMoreWrapper = new LoadMoreWrapper(mOriginAdapter);
mLoadMoreWrapper.setLoadMoreView(R.layout.default_loading);
mLoadMoreWrapper.setOnLoadMoreListener(new LoadMoreWrapper.OnLoadMoreListener()
{
    @Override
    public void onLoadMoreRequested()
    {
    }
});

mRecyclerView.setAdapter(mLoadMoreWrapper);

例

        HeaderAndFooterWrapper mHeaderAndFooterWrapper = new HeaderAndFooterWrapper(adapter);

        TextView t1 = new TextView(this);
        t1.setText("Header 1");
        TextView t2 = new TextView(this);
        t2.setText("Header 2");
        mHeaderAndFooterWrapper.addHeaderView(t1);
        mHeaderAndFooterWrapper.addHeaderView(t2);

        recyclerView.setAdapter(mHeaderAndFooterWrapper);
        mHeaderAndFooterWrapper.notifyDataSetChanged();

添加LoadMore

mLoadMoreWrapper = new LoadMoreWrapper(mOriginAdapter);
mLoadMoreWrapper.setLoadMoreView(R.layout.default_loading);
mLoadMoreWrapper.setOnLoadMoreListener(new LoadMoreWrapper.OnLoadMoreListener()
{
    @Override
    public void onLoadMoreRequested()
    {
    }
});

mRecyclerView.setAdapter(mLoadMoreWrapper);

添加EmptyView

空页面

mAdapter.getDatas().clear();//清除数据，才会显示空页面哦
mEmptyWrapper = new EmptyWrapper(mAdapter);//HEADER FOOTER本身就会清理
mEmptyWrapper.setEmptyView(R.layout.empty_view);

mRecyclerView.setAdapter(mEmptyWrapper);

另一个用法不知道

        EmptyViewWrapper  mAdapter = new EmptyViewWrapper(
                new LoadMoreWrapper(
                        new HeaderAndFooterWrapper(mOriginAdapter)));

回调

onViewHolderCreated

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        ItemViewDelegate itemViewDelegate = mItemViewDelegateManager.getItemViewDelegate(viewType);
        int layoutId = itemViewDelegate.getItemViewLayoutId();
        ViewHolder holder = ViewHolder.createViewHolder(mContext, parent, layoutId);
        onViewHolderCreated(holder,holder.getConvertView());
        setListener(parent, holder, viewType);
        return holder;
    }

    public void onViewHolderCreated(ViewHolder holder,View itemView){

    }

如上，是封装的源代码。onViewHolderCreated方法是提供给外面，用于布局操作。

如下，例：

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int type) {
        ViewHolder holder = super.onCreateViewHolder(viewGroup, type);
        
        holder.setLayoutParams(R.id.notice_content_layout, 
        	new LinearLayout.LayoutParams((
        		ScreenUtils.getScreenWidth(getContext()) - dp2px(40)), 
        		LinearLayout.LayoutParams.MATCH_PARENT));
        		
        return holder;
    }

当需要对某一控件设置固定长度时。

本文地址：https://blog.csdn.net/weixin_35691921/article/details/107353324