Android商城开发系列（十二）—— 首页推荐布局实现

　　首页新品推荐的布局效果如下图：

　　

 　　这块布局是使用LinearLayout和GridView去实现，新建recommend_item.xml，代码如下所示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#fff">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:padding="10dp">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@mipmap/home_arrow_left_new" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="新品推荐"
            android:textColor="#000" />

        <TextView
            android:id="@+id/tv_more_recommend"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:drawablePadding="5dp"
            android:drawableRight="@mipmap/home_arrow_right"
            android:gravity="end"
            android:text="查看更多" />
    </LinearLayout>

    <GridView
        android:id="@+id/gv_recommend"
        android:layout_width="match_parent"
        android:layout_height="380dp"
        android:numColumns="3"/>

</LinearLayout>

　　继续在HomeFragmentAdapter类中去添加推荐的ViewHolder，在onCreateViewHolder()方法中创建RecommendViewHolder，代码如下所示：

package com.nyl.shoppingmall.home.adapter;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.nyl.shoppingmall.R;
import com.nyl.shoppingmall.home.bean.ResultBeanData;
import com.nyl.shoppingmall.utils.Constants;
import com.youth.banner.Banner;
import com.youth.banner.BannerConfig;
import com.youth.banner.Transformer;
import com.youth.banner.listener.OnBannerClickListener;
import com.youth.banner.listener.OnLoadImageListener;
import com.zhy.magicviewpager.transformer.ScaleInTransformer;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * 首页适配器
 */

public class HomeFragmentAdapter extends RecyclerView.Adapter{

    /**
     * 广告幅类型
     */
    public static final int BANNER = 0;

    /**
     * 频道类型
     */
    public static final int CHANNEL = 1;

    /**
     * 活动类型
     */
    public static final int ACT = 2;

    /**
     * 秒杀类型
     */
    public static final int SECKILL = 3;

    /**
     * 推荐类型
     */
    public static final int RECOMMEND = 4;

    /**
     * 热卖类型
     */
    public static final int HOT = 5;

    /**
     * 初始化布局
     */
    private LayoutInflater mLayoutInflater;

    /**
     * 数据
     */
    private ResultBeanData.ResultBean resultBean;
    private Context mContext;

    /**
     * 当前类型
     */
    private int currenType = BANNER;

    public HomeFragmentAdapter(Context mContext, ResultBeanData.ResultBean resultBean) {
        this.mContext = mContext;
        this.resultBean = resultBean;
        mLayoutInflater = LayoutInflater.from(mContext);
    }

    /**
     * 相当于getView创建ViewHolder部分代码
     * @param parent
     * @param viewType 当前的类型
     * @return
     */
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //广告福
        if (viewType == BANNER){
            //创建BannerViewHolder，Banner里面传布局文件
            return new BannerViewHolder(mContext,mLayoutInflater.inflate(R.layout.banner_viewpager,null));
            //频道
        }else if (viewType == CHANNEL){
            return new ChannelViewHolder(mContext,mLayoutInflater.inflate(R.layout.channel_item,null));
            //活动
        }else if (viewType == ACT){
            return new ActViewHolder(mContext,mLayoutInflater.inflate(R.layout.act_item,null));
            //秒杀
        }else if (viewType == SECKILL){
            return new SeckillViewHolder(mContext,mLayoutInflater.inflate(R.layout.seckkill_item,null));
            //推荐
        }else if (viewType == RECOMMEND){
            return new RecommendViewHolder(mContext,mLayoutInflater.inflate(R.layout.recommend_item,null));
        }
        return null;
    }

    /**
     * 相当于getView中绑定数据模块
     * @param holder
     * @param position
     */
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        //轮循广告
        if (getItemViewType(position) == BANNER){
            BannerViewHolder bannerViewHolder = (BannerViewHolder) holder;
            bannerViewHolder.setData(resultBean.getBanner_info());
            /**
             * 频道
             */
        }else if (getItemViewType(position) == CHANNEL){
            ChannelViewHolder channelViewHolder = (ChannelViewHolder) holder;
            channelViewHolder.setData(resultBean.getChannel_info());
            /**
             * 活动
             */
        }else if (getItemViewType(position) == ACT){
            ActViewHolder actViewHolder = (ActViewHolder) holder;
            actViewHolder.setData(resultBean.getAct_info());
            /**
             * 秒杀
             */
        }else if (getItemViewType(position) == SECKILL){
            SeckillViewHolder seckillViewHolder = (SeckillViewHolder) holder;
            seckillViewHolder.setData(resultBean.getSeckill_info());
            /**
             * 推荐
             */
        }else if (getItemViewType(position) == RECOMMEND){
            RecommendViewHolder recommendViewHolder = (RecommendViewHolder) holder;
            recommendViewHolder.setData(resultBean.getRecommend_info());
        }
    }

    /**
     * 广告幅
     */
    class BannerViewHolder extends RecyclerView.ViewHolder{

        private Context mContext;
        private Banner banner;

        public BannerViewHolder(Context mContext, View itemView) {
            super(itemView);
            this.mContext = mContext;
            this.banner = (Banner) itemView.findViewById(R.id.banner);
        }

        public void setData(List<ResultBeanData.ResultBean.BannerInfoEntity> banner_info) {
            //得到图片集合地址
            List<String> imagesUrl = new ArrayList<>();
            for (int i = 0;i<banner_info.size();i++){
                String imageUrl = banner_info.get(i).getImage();
                imagesUrl.add(imageUrl);
            }
            //设置循环指示点
            banner.setBannerStyle(BannerConfig.CIRCLE_INDICATOR);
            //设置手风琴效果
            banner.setBannerAnimation(Transformer.Accordion);
            //设置Banner图片数据
            banner.setImages(imagesUrl, new OnLoadImageListener() {
                @Override
                public void OnLoadImage(ImageView view, Object url) {
                    //联网请求图片-Glide
                    Glide.with(mContext).load(Constants.BASE_URL_IMAGE + url).into(view);
                }
            });
            //设置点击事件
            banner.setOnBannerClickListener(new OnBannerClickListener() {
                @Override
                public void OnBannerClick(int position) {
                    Toast.makeText(mContext,"position=="+position,Toast.LENGTH_SHORT).show();
                }
            });
        }
    }

    /**
     * 频道
     */
    class ChannelViewHolder extends RecyclerView.ViewHolder{

        private Context mContext;
        private GridView gv_channel;
        private ChannelAdapter adapter;

        public ChannelViewHolder(Context mContext, View itemView) {
            super(itemView);
            this.mContext = mContext;
            gv_channel = (GridView) itemView.findViewById(R.id.gv_channel);
        }

        public void setData(List<ResultBeanData.ResultBean.ChannelInfoBean> channel_info) {
            //得到数据后，就设置GridView的适配器
            adapter = new ChannelAdapter(mContext,channel_info);
            gv_channel.setAdapter(adapter);

            //设置item的点击事件
            gv_channel.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
                    Toast.makeText(mContext,"position"+position,Toast.LENGTH_SHORT).show();
                }
            });
        }
    }

    /**
     * 活动
     */
    class ActViewHolder extends RecyclerView.ViewHolder{

        private Context mContext;
        private ViewPager act_viewpager;

        public ActViewHolder(Context mContext,View itemView) {
            super(itemView);
            this.mContext = mContext;
            act_viewpager = (ViewPager) itemView.findViewById(R.id.act_viewpager);
        }

        public void setData(final List<ResultBeanData.ResultBean.ActInfoEntity> act_info) {
            //设置间距
            act_viewpager.setPageMargin(20);
            act_viewpager.setOffscreenPageLimit(3);//>=3
            //setPageTransformer 决定动画效果
            act_viewpager.setPageTransformer(true, new ScaleInTransformer());
            //有数据后，就设置数据适配器
            act_viewpager.setAdapter(new PagerAdapter() {
                @Override
                public int getCount() {
                    return act_info.size();
                }

                /**
                 *
                 * @param view 页面
                 * @param object instantiateItem方法返回的值
                 * @return
                 */
                @Override
                public boolean isViewFromObject(View view, Object object) {
                    return view == object;
                }

                /**
                 *
                 * @param container ViewPager
                 * @param position 对应页面的位置
                 * @return
                 */
                @Override
                public Object instantiateItem(ViewGroup container, final int position) {
                    //实例化ImageView
                    ImageView imageView = new ImageView(mContext);
                    //设置ImageView的拉伸
                    imageView.setScaleType(ImageView.ScaleType.FIT_XY);
                    //根据Glide设置图片
                    Glide.with(mContext).load(Constants.BASE_URL_IMAGE+act_info.get(position).getIcon_url()).into(imageView);
                    //添加到容器中
                    container.addView(imageView);

                    //设置点击事件
                    imageView.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            Toast.makeText(mContext,"position=="+position,Toast.LENGTH_SHORT).show();
                        }
                    });
                    return imageView;
                }

                @Override
                public void destroyItem(ViewGroup container, int position, Object object) {
                    container.removeView((View) object);
                }
            });
        }
    }

    /**
     * 秒杀
     */
    class SeckillViewHolder extends RecyclerView.ViewHolder{

        private Context mContext;
        private TextView tv_time_seckill;
        private TextView tv_more_seckill;
        private RecyclerView rv_seckill;
        private SeckillRecycleViewAdapter adapter;

        /**
         * 相差多少时间-毫秒
         */
        private long dt = 0;
        //不断循环
        private Handler handler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                dt = dt - 1000;
                //设置具体的时间
                SimpleDateFormat dateFormat = new SimpleDateFormat("hh:mm:ss");
                String time = dateFormat.format(new Date(dt));
                tv_time_seckill.setText(time);

                handler.removeMessages(0);
                //发送消息，不断减时间
                handler.sendEmptyMessageDelayed(0,1000);
                if (dt <= 0){
                    //把消息移除
                    handler.removeCallbacksAndMessages(null);
                }
            }
        };

        public SeckillViewHolder(Context mContext, View itemView) {
            super(itemView);
            this.mContext = mContext;
            //初始化布局控件
            tv_time_seckill = (TextView) itemView.findViewById(R.id.tv_time_seckill);
            tv_more_seckill = (TextView) itemView.findViewById(R.id.tv_more_seckill);
            rv_seckill = (RecyclerView) itemView.findViewById(R.id.rv_seckill);
        }

        public void setData(ResultBeanData.ResultBean.SeckillInfoEntity seckill_info) {
            //得到数据后，就是设置数据（TextView和RecyclerView）的数据
            adapter = new SeckillRecycleViewAdapter(mContext,seckill_info.getList());
            rv_seckill.setAdapter(adapter);

            //设置布局管理器
            rv_seckill.setLayoutManager(new LinearLayoutManager(mContext,LinearLayoutManager.HORIZONTAL,false));
            //设置item的点击事件
            adapter.setOnSeckillRecyclerView(new SeckillRecycleViewAdapter.OnSeckillRecyclerView() {
                @Override
                public void onItemClick(int position) {
                    Toast.makeText(mContext,"秒杀"+position,Toast.LENGTH_SHORT).show();
                }
            });
            //秒杀倒计时-毫秒
            dt = Integer.valueOf(seckill_info.getEnd_time()) - Integer.valueOf(seckill_info.getStart_time());
            //进入后1秒钟就去发送这个消息
            handler.sendEmptyMessageDelayed(0,1000);

        }
    }

    /**
     * 推荐
     */
    class RecommendViewHolder extends RecyclerView.ViewHolder{

        private final Context mContext;
        private TextView tv_more_recommend;
        private GridView gv_recommend;
        private RecommendGridViewAdapter adapter;

        public RecommendViewHolder(final Context mContext, View itemView) {
            super(itemView);
            this.mContext = mContext;
            tv_more_recommend = (TextView) itemView.findViewById(R.id.tv_more_recommend);
            gv_recommend = (GridView) itemView.findViewById(R.id.gv_recommend);

            //设置点击事件
            gv_recommend.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
                    Toast.makeText(mContext,"position=="+position,Toast.LENGTH_SHORT).show();
                }
            });
        }

        public void setData(List<ResultBeanData.ResultBean.RecommendInfoBean> recommend_info) {
            //有数据了之后，就设置适配器
            adapter = new RecommendGridViewAdapter(mContext,recommend_info);
            gv_recommend.setAdapter(adapter);

        }
    }

    /**
     * 得到不同的类型
     * @param position
     * @return
     */
    @Override
    public int getItemViewType(int position) {
        switch (position){
            case BANNER: //广告幅
                currenType = BANNER;
                break;
            case CHANNEL: //频道
                currenType = CHANNEL;
                break;
            case ACT: //活动
                currenType = ACT;
                break;
            case SECKILL: //秒杀
                currenType = SECKILL;
                break;
            case RECOMMEND: //推荐
                currenType = RECOMMEND;
                break;
            case HOT: //热卖
                currenType = HOT;
                break;
        }
        return currenType;
    }

    /**
     * 总共有多少个item
     * @return
     */
    @Override
    public int getItemCount() {
        return 5;
    }
}

　　有数据了之后，下一步要做的就是使用适配器将数据展示出来，先设计gridView的item的布局，新建item_recommend_grid_view.xml，代码如下所示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="10dp">

    <ImageView
        android:id="@+id/iv_recommend"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:background="@mipmap/new_img_loading_2" />

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:ellipsize="end"
        android:lines="2"
        android:text="全款预售【喵鹿酱】樱桃蜜语 毛呢绣花 小高腰半裙"
        android:textColor="#000" />

    <TextView
        android:id="@+id/tv_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="￥88.00"
        android:textColor="#ff4242" />
</LinearLayout>

　　新建RecommendGridViewAdapter类，代码如下：

package com.nyl.shoppingmall.home.adapter;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.nyl.shoppingmall.R;
import com.nyl.shoppingmall.home.bean.ResultBeanData;
import com.nyl.shoppingmall.utils.Constants;

import java.util.List;

/**
 * 推荐GridView的适配器
 */

public class RecommendGridViewAdapter extends BaseAdapter{

    private final Context mContext;
    private final List<ResultBeanData.ResultBean.RecommendInfoBean> datas;

    public RecommendGridViewAdapter(Context mContext, List<ResultBeanData.ResultBean.RecommendInfoBean> recommend_info) {
        this.mContext = mContext;
        this.datas = recommend_info;
    }

    @Override
    public int getCount() {
        return datas.size();
    }

    @Override
    public Object getItem(int i) {
        return null;
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public View getView(int position, View view, ViewGroup viewGroup) {
        ViewHolder viewHolder;
        if (view == null){
            view = View.inflate(mContext, R.layout.item_recommend_grid_view,null);
            viewHolder = new ViewHolder();
            viewHolder.iv_recommend = (ImageView) view.findViewById(R.id.iv_recommend);
            viewHolder.tv_name = (TextView) view.findViewById(R.id.tv_name);
            viewHolder.tv_price = (TextView) view.findViewById(R.id.tv_price);
            view.setTag(viewHolder);
        }else {
            viewHolder = (ViewHolder) view.getTag();
        }
        //根据位置得到对应的数据
        ResultBeanData.ResultBean.RecommendInfoBean recommendInfoBean = datas.get(position);
        //设置网络图片
        Glide.with(mContext).load(Constants.BASE_URL_IMAGE+recommendInfoBean.getFigure()).into(viewHolder.iv_recommend);
        viewHolder.tv_name.setText(recommendInfoBean.getName());
        viewHolder.tv_price.setText("¥"+recommendInfoBean.getCover_price());
        return view;
    }
    static class ViewHolder{
        ImageView iv_recommend;
        TextView tv_name;
        TextView tv_price;
    }
}

　　 关于首页推荐布局的内容就那么多！