Android商城开发系列（九）—— 首页频道布局的实现

<?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="170dp"
android:background="#fff">

<GridView
android:id="@+id/gv_channel"
android:layout_width="wrap_content"
android:layout_height="150dp"
android:numColumns="5"></GridView>

</LinearLayout>　

　　同样的也是需要创建一个在onCreateViewHolder()方法中创建ChannelViewHolder,继续在HomeFragmentAdapter类中去完善，代码如下所示：

package com.nyl.shoppingmall.home.adapter;

import android.content.Context;
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.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 java.util.ArrayList;
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) {
//轮循广告
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));
}
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) {
if (getItemViewType(position) == BANNER){
BannerViewHolder bannerViewHolder = (BannerViewHolder) holder;
bannerViewHolder.setData(resultBean.getBanner_info());
}else if (getItemViewType(position) == CHANNEL){
ChannelViewHolder channelViewHolder = (ChannelViewHolder) holder;
channelViewHolder.setData(resultBean.getChannel_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();
}
});
}
}
/**
* 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 2;
}

}

　　接着新建一个ChannelAdapter类，代码如下所示：

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;

/**
* 频道适配器
*/

public class ChannelAdapter extends BaseAdapter{
private final Context mContext;
private final List<ResultBeanData.ResultBean.ChannelInfoBean> datas;

public ChannelAdapter(Context mContext, List<ResultBeanData.ResultBean.ChannelInfoBean> channel_info) {
this.mContext = mContext;
this.datas = channel_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 convertView, ViewGroup viewGroup) {
ViewHolder viewHolder;
if (convertView == null){
convertView = View.inflate(mContext, R.layout.item_channel,null);
viewHolder = new ViewHolder();
viewHolder.iv_channel = (ImageView) convertView.findViewById(R.id.iv_channel);
viewHolder.tv_channel = (TextView) convertView.findViewById(R.id.tv_channel);
convertView.setTag(viewHolder);
}else {
viewHolder = (ViewHolder) convertView.getTag();
}
//根据位置得到对应的数据
ResultBeanData.ResultBean.ChannelInfoBean channelInfoBean = datas.get(position);
//根据Glide设置图片
Glide.with(mContext).load(Constants.BASE_URL_IMAGE+channelInfoBean.getImage()).into(viewHolder.iv_channel);
viewHolder.tv_channel.setText(channelInfoBean.getChannel_name());
return convertView;
}
static class ViewHolder{
ImageView iv_channel;
TextView tv_channel;
}
}