RecyclerView

一、简单介绍

这个是谷歌官方出的控件。使我们能够很easy的做出列表装的一个控件，当然recyclerview的功能不止这些，它还能够做出瀑布流的效果，这是一个很强大的控件，内部自带viewholder能够使我们很easy的完毕很多操作，正在一步一步代替listview这个控件。当然它也有一些小的缺点。那就是谷歌官方并没有直接给我写出它的点击事件的接口，可是这并难不倒我们，我们能够自己写一个回调的接口。实现点击事件。在这里我不仅要为大家介绍recyclerview的item的点击事件，还要为大家介绍，一个item中局部的点击事件，还有加入header、footer，还有加入不同类别的item的布局。能够说彻底的读懂了这篇文章，我们对recyclerview就有了一个新的认识了。

二、涉及到的知识点

• item的点击事件
• item里面内容的点击事件
• 为recycler view加入header和footer
• 为item加入不同的布局

三、实现代码

/** * Created by linSir on 16/7/24.管理地址界面的适配器 */public class ManageAddressAdapter extends RecyclerView.Adapter
      
        {
     //在这里我们要继承自官方为我们写好的适配器    public OnTitleClickListener mListener;    private List
       
         mList;  //用户列表    public ManageAddressAdapter() {        mList = new ArrayList<>();    }    public void setList(List
        
          list) {
     //从外界传入一个list        mList.clear();        mList.addAll(list);        notifyDataSetChanged();    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
     //重写方法，用上我们以下写好的viewHoler        return new ManageAddressViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_manage_address, parent, false));    }    @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
     //在这里我们将数据和控件绑定起来        ManageAddressViewHolder mHolder = (ManageAddressViewHolder) holder;        mHolder.userName.setText(mList.get(position).getShipName());        mHolder.userTel.setText(mList.get(position).getPhone());        String address = mList.get(position).getProvince() + " " + mList.get(position).getCity()                + " " + mList.get(position).getArea() + " " + mList.get(position).getDetail();        mHolder.address.setText(address);        mHolder._default.setOnClickListener(new ClickListener(String.valueOf(position)));//在这里我们设置了点击事件    }    @Override public int getItemCount() {        return mList.size();    }    public static class ManageAddressViewHolder extends RecyclerView.ViewHolder {        private TextView userName;        private TextView userTel;        private TextView address;        private TextView _default;        public ManageAddressViewHolder(View itemView) {            super(itemView);            userName = (TextView) itemView.findViewById(R.id.manage_userName);            userTel = (TextView) itemView.findViewById(R.id.manage_userTel);            address = (TextView) itemView.findViewById(R.id.manage_userAddress);            _default = (TextView) itemView.findViewById(R.id.manage_default);        }    }    public class ClickListener implements View.OnClickListener {
     //在这里我们重写了点击事件        private String id;        public ClickListener(String id) {            this.id = id;        }        @Override public void onClick(View view) {            if (mListener != null) {                mListener.onTitleClick(id);            }        }    }    public void setOnTitleClickListener(OnTitleClickListener listener) {
     //自己写了一个方法，用上我们的接口        mListener = listener;    }    public interface OnTitleClickListener {
     //自己写了一个点击事件的接口        void onTitleClick(String id);    }}
        
       
      

通过以上的代码，我们已经为recyclerView里面的item里面的textview加入成功了点击事件，我们仅仅须要在调用它的界面实现这个接口。然后重写点击事件的方法。就能够实现这个textview的点击事件了，以下我们一起看一下代码：

/** * Created by linSir on 16/7/24.管理地址界面 */public class ManageAddressActivity extends AppCompatActivity implements ManageAddressAdapter.OnTitleClickListener {
      //实现上文我们写好的点击事件的接口    private ManageAddressAdapter mAdapter;    private List
      
        list;    @BindView(R.id.manage_address_recyclerView) RecyclerView mRecyclerView;    @Override protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_manage);        ButterKnife.bind(this);        list = new ArrayList
       
        ();        mAdapter = new ManageAddressAdapter();        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);        mAdapter.setOnTitleClickListener(this);//声明一下        mRecyclerView.setAdapter(mAdapter);        mRecyclerView.setLayoutManager(linearLayoutManager);//这里千万不要了为recyclerview设置布局    }    @OnClick(R.id.back_manage_address)    public void back() {        finish();    }    @OnClick(R.id.manage_add_address)    public void add() {        Intent intent = new Intent(ManageAddressActivity.this, EditAddress.class);        startActivity(intent);    }    @Override    protected void onResume() {        super.onResume();        final HttpResultListener
        
         
          > listener;        listener = new HttpResultListener
          
           
            >() { @Override public void onSuccess(List
            
              allAddresses) { Toast.makeText(ManageAddressActivity.this, "获取收货成功", Toast.LENGTH_SHORT).show(); mAdapter.setList(allAddresses); list = allAddresses; } @Override public void onError(Throwable e) { Log.i("lin", "----lin----> 获取收货地址失败 " + e.toString()); } }; ApiService5.getInstance().allAddress(listener, 1); } @Override public void onTitleClick(String id) { //这里便是我们重写了的点击事件 Log.i("lin", "----lin----> onTitleClick 的 id " + id); }}
            
           
          
         
        
       
      

以上的代码，我们实现了，为recyclerView的一个item中的textview加入的点击事件，以下我要为大家介绍一下，怎样为recyclerView中item加入不同的布局文件，而且怎样为item整个加入点击事件：

/** * Created by lin_sir on 2016/7/7.部分商品的展示,的适配器 */public class BuyerRecyclerAdapter extends RecyclerView.Adapter
      
        {
          public static final int FOOTER_TYPE = 0;//最后一个的类型    public static final int HAS_IMG_TYPE = 1;//有图片的类型    private List
       
         dataList;    private ProgressBar mProgress;    private TextView mNoMore;    public BuyerRecyclerAdapter() {        dataList = new ArrayList<>();    }    public void addData(List
        
          list) {        dataList.addAll(list);        notifyDataSetChanged();    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        if (viewType == FOOTER_TYPE) {            return new FooterItemViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_footer, parent, false));        } else {            return new BuyerItemViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_buyer, parent, false));        }    }    @Override    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {        int type = getItemViewType(position);        if (type == FOOTER_TYPE) {            bindFooterView((FooterItemViewHolder) holder);        } else {            bindView((BuyerItemViewHolder) holder, dataList.get(position));        }    }    @Override    public int getItemViewType(int position) {        if (position + 1 == getItemCount()) {            return FOOTER_TYPE;        } else {            FamousPageModel news = dataList.get(position);            return HAS_IMG_TYPE;        }    }    private void bindView(BuyerItemViewHolder holder, FamousPageModel data) {        String productName = data.getProductName();        String[] products = productName.split(" ");        if (products.length != 1) {            productName = products[1] + " 等商品";        }        String count = data.getNum();        int sum = 0;        String[] counts = count.split(" ");        if (counts.length == 2) {            sum = Integer.parseInt(counts[0]) + Integer.parseInt(counts[1]);            count = String.valueOf(sum);        }        if (counts.length == 3) {            sum = Integer.parseInt(counts[0]) + Integer.parseInt(counts[1]) + Integer.parseInt(counts[2]);            count = String.valueOf(sum);        }        holder.count.setText(count);        holder.goods_name.setText(productName);        holder.price.setText(data.getTotal());        if (data.getUser() != null) {            holder.user_name.setText(data.getUser().getName());        }        String imgUrl = data.getPicture();        if (imgUrl != null) {            ImageUtil.requestImg(BaseApplication.get().getAppContext(), imgUrl, holder.img);        }//        Picasso.with(BaseApplication.get().getAppContext()).load(data.getPicture()).into(holder.img);    }    @Override    public int getItemCount() {        return dataList == null ? 0 : dataList.size() + 1;    }    public static class BuyerItemViewHolder extends RecyclerView.ViewHolder {
              private ImageView img;        private TextView price;        private TextView goods_name;        private TextView count;        private TextView user_name;        public BuyerItemViewHolder(View itemView) {            super(itemView);            img = (ImageView) itemView.findViewById(R.id.iv_user_item_buyer2);            price = (TextView) itemView.findViewById(R.id.tv_product_price);            goods_name = (TextView) itemView.findViewById(R.id.tv_product_name);            count = (TextView) itemView.findViewById(R.id.tv_product_number);            user_name = (TextView) itemView.findViewById(R.id.tv_user_name);        }    }    /**     * 刷新列表     */    public void refreshList(List
         
           list) {        dataList.clear();        dataList.addAll(list);        notifyDataSetChanged();    }    /**     * 载入很多其它     */    public void loadMoreList(List
          
            list) {        dataList.addAll(list);        notifyDataSetChanged();    }    /**     * 显示没有很多其它     */    public void showNoMore() {        if (getItemCount() > 0) {            if (mProgress != null && mNoMore != null) {                mNoMore.setVisibility(View.VISIBLE);                mProgress.setVisibility(View.GONE);            }        }    }    /**     * 显示载入很多其它     */    public void showLoadMore() {        if (mProgress != null && mNoMore != null) {            mProgress.setVisibility(View.VISIBLE);            mNoMore.setVisibility(View.GONE);        }    }    private void bindFooterView(FooterItemViewHolder viewHolder) {        mProgress = viewHolder.mProgress;        mNoMore = viewHolder.tvNoMore;    }    public static class FooterItemViewHolder extends RecyclerView.ViewHolder {
              private ProgressBar mProgress;        private TextView tvNoMore;        public FooterItemViewHolder(View itemView) {            super(itemView);            mProgress = (ProgressBar) itemView.findViewById(R.id.pb_footer_load_more);            tvNoMore = (TextView) itemView.findViewById(R.id.tv_footer_no_more);        }    }    /**     * 获取点击的 item,假设是最后一个,则返回 null     */    public FamousPageModel getClickItem(int position) {        if (position < dataList.size()) {            return dataList.get(position);        } else {            return null;        }    }}
          
         
        
       
      

在这里我们首先重写了getItemViewType。这里面我眼下仅仅写了两种类型。那就是带有图片的类型。和不带有图片的类型，而且我让不带图片的类型出如今了最后面，当然大家能够任意的设置。我们仅仅须要依据它们的特征为他们分好类，然后依据不同的类型载入不同的布局文件就可以。

/** * Created by lin_sir on 2016/7/7. buyer界面 */public class FragmentBuyer extends Fragment implements SwipeRefreshLayout.OnRefreshListener {
          private static int CURRENT_PAGE = 1;                            //获取须要请求的页号    private RecyclerView recyclerView;                              //recyclerView    private BuyerRecyclerAdapter madapter;                          //适配器    private List
      
        mlist;                            //一个装载数据的集合    private LinearLayoutManager linearLayoutManager;                //linearLayoutManger    private HttpResultListener
       
        
         > listener;     //数据请求的回调接口    private SwipeRefreshLayout refreshLayout;                       //下拉刷新控件    private boolean isLoadMore;                                     //是否载入很多其它    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragment_buyer, container, false);        initviews(view);        initListener();        refreshData();        ButterKnife.bind(this, view);        return view;    }    private void initListener() {        listener = new HttpResultListener
         
          
           >() {            @Override            public void onSuccess(List
           
             list) { Log.i("lin", "----lin----> refresh success"); refreshLayout.setRefreshing(false); if (isLoadMore) { mlist = list; madapter.loadMoreList(mlist); madapter.notifyDataSetChanged(); madapter.showNoMore(); } else { mlist = list; madapter.refreshList(list); madapter.notifyDataSetChanged(); } } @Override public void onError(Throwable e) { Log.i("lin", "----lin----> refresh error " + e.toString()); refreshLayout.setRefreshing(false); madapter.showNoMore(); } }; } private void initviews(View view) { mlist = new ArrayList<>(); refreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.refresh_news); recyclerView = (RecyclerView) view.findViewById(R.id.rv_buyer); refreshLayout.setColorSchemeResources(R.color.blue_500, R.color.purple_500, R.color.green_500); refreshLayout.setOnRefreshListener(this); linearLayoutManager = new LinearLayoutManager(getActivity()); linearLayoutManager.setOrientation(OrientationHelper.VERTICAL); madapter = new BuyerRecyclerAdapter(); madapter.addData(mlist); recyclerView.setLayoutManager(linearLayoutManager); recyclerView.setAdapter(madapter); recyclerView.addOnScrollListener(new OnRecyclerScrollListener()); recyclerView.addOnItemTouchListener(new RecyclerItemClickListener(getActivity(), onItemClickListener)); } /** * 刷新时,默认请求第一页的数据 */ private void refreshData() { refreshLayout.setRefreshing(true); isLoadMore = false; CURRENT_PAGE = 1; requestData(1); } /** * 载入很多其它 */ private void loadMoreData() { refreshLayout.setRefreshing(false);// 载入很多其它与刷新不能同一时候存在 isLoadMore = true; requestData(++CURRENT_PAGE); } public class OnRecyclerScrollListener extends RecyclerView.OnScrollListener { int lastVisibleItem = 0; @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { super.onScrollStateChanged(recyclerView, newState); if (madapter != null && newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 == madapter.getItemCount()) { loadMoreData(); } } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition(); } } /** * 请求数据 */ private void requestData(int page) { madapter.showLoadMore(); ApiService2.getInstance().famous(listener, page); } @Override public void onRefresh() { refreshData(); } private RecyclerItemClickListener.OnItemClickListener onItemClickListener = new RecyclerItemClickListener.OnItemClickListener() { //这里我们便实现了点击事件 @Override public void onItemClick(View view, int position) { Toast.makeText(getActivity(), "您点击的是： " + position, Toast.LENGTH_SHORT).show(); } }; @OnClick(R.id.release_distance_buyer) public void release() { Intent intent = new Intent(getActivity(), ReleaseOrderActivity.class); startActivity(intent); } @Override public void onDestroy() { super.onDestroy(); }}
           
          
         
        
       
      

以上便是依据我近期做的项目粗略的整理了一下。recyclerview的简单使用方法。在这里我也用到了，下拉刷新，上拉载入很多其它，等等等等的方法，写这些也是为了让自己在以后遇到相同的需求的时候，能够很快的写出，假设大家也有这些小问题的能够和我一起交流。