XListView+工具类+接口回调+获取数据（轮播图）

//工具类

package com.example.weektwo;

import android.os.AsyncTask;

import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class NetUtils {
    //初始化一个GSon
    private Gson gson;
    //单例
    private static  NetUtils instance;

    //创建私有构造
    private NetUtils(){
        //实例化一个GSON
        gson = new Gson();
    }
    //提供静态方法让外面获取实例对象
    public static NetUtils getInstance(){
        if (instance == null){
            instance = new NetUtils();
        }
        return instance;
    }
    //定义一个接口
    public interface Callbak<T>{
        void onSuccess(T t);
    }
    //接口回调
    public void  getRequset(final String urlStr,final  Class clazz,final Callbak callbak){
        new AsyncTask<String,Void,Object>(){

            @Override
            protected Object doInBackground(String... strings) {
                return getRequset(urlStr,clazz);
            }

            @Override
            protected void onPostExecute(Object o) {
                callbak.onSuccess(o);
            }
        }.execute(urlStr);
    }


    //GSON解析的方法
    public <T> T getRequset(String urlStr,Class clazz){
        //gson 解析数据  解析后的数据传给clazz
        return (T) gson.fromJson(getRequset(urlStr),clazz);
    }


    //创建网络请求方法
    public String getRequset(String urlStr){
        String result = "";
        try {
            URL url = new URL(urlStr);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setConnectTimeout(5000);
            urlConnection.setReadTimeout(5000);
            int responseCode = urlConnection.getResponseCode();
            if (responseCode == 200){
                result = stream2String(urlConnection.getInputStream());
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    private String stream2String(InputStream inputStream) throws IOException {
        InputStreamReader is = new InputStreamReader(inputStream);
        BufferedReader br = new BufferedReader(is);
        StringBuilder sb = new StringBuilder();
        for (String temp = br.readLine() ; temp != null; temp = br.readLine()){
            sb.append(temp);
        }
        return sb.toString();
    }
}

//主页面`

package com.example.weektwo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.example.xlistview2.me.maxwin.view.XListView;

public class MainActivity extends AppCompatActivity {
    private XListView contents;
    private ContentsAdapter newadapter;
    private BannerAdapter banneradapter;
    private int pager;
    private final int LOAD_COUNT = 10;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pager=1;
        //获取listview 资源ID
        contents = findViewById(R.id.contents);
        //适配器  创建适配器
        newadapter = new ContentsAdapter(this);
        //设置适配器
        contents.setAdapter(newadapter);
        //设置XListView 支持刷新和加载   支持刷新是默认的
        contents.setPullRefreshEnable(true);
        contents.setPullLoadEnable(true);
        //设置XListview 监听事件
        contents.setXListViewListener(new XListView.IXListViewListener() {
            //自动重写两个方法
            @Override
            public void onRefresh() {
                pager = 1;
                loadData();
            }

            @Override
            public void onLoadMore() {
                pager++;
                loadData();
            }
        });
        loadData();
    }
    //创建加载的方法
    private void loadData(){
        if (pager== 1){
            //这里运行时出现错误   原因是 没有展示新闻数据
            //当pager 等于一时说明是刷新数据
            //要加载轮播图和新闻数据
            loadBannerData();
            LoadNewData();
        }else {
            //  当不等于1时说明是加载
            //只需要加载新闻数据
            LoadNewData();

        }
    }

    //加载轮播图
    private void loadBannerData(){
        NetUtils.getInstance().getRequset(bannerUrl, BannerBean.class, new NetUtils.Callbak<BannerBean>() {
            @Override
            public void onSuccess(BannerBean bannerBean) {

                newadapter.setmBanner(bannerBean.getData());

            }
        });
    }

    //加载新闻数据
    private void LoadNewData(){
        NetUtils.getInstance().getRequset(String.format(newsUrl, LOAD_COUNT, pager), NewsBean.class, new NetUtils.Callbak<NewsBean>() {

            @Override
            public void onSuccess(NewsBean newsBean) {
                //当pager是1的时候执行下拉
                if (pager == 1){
                    //
                    newadapter.setmNews(newsBean.getResult());
                }else {
                    //不等于1 的时候执行上拉加载
                    newadapter.addmNews(newsBean.getResult());
                }
                //停止刷新加载
                contents.stopLoadMore();
                contents.stopRefresh();
                //当getData集合中的数据个数小于当也要加载的个数时他就停止加载
                //没数据了还加载个毛啊
                if (newsBean.getResult().size()<LOAD_COUNT){
                    contents.setPullLoadEnable(false);
                }
            }

        });
    }
    //banner
    private String bannerUrl = "http://www.zhaoapi.cn/quarter/getAd";
    //news
    private String newsUrl = "http://172.17.8.100/movieApi/movie/v1/findHotMovieList?count=%d&page=%d";
}

//新闻数据的适配器

package com.example.weektwo;

import android.content.Context;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.ArrayList;
import java.util.List;
import java.util.logging.Handler;

//设置新闻的适配器  banner是在一个子条目中写的
//所以新闻的适配器里应该有两个集合一个存放banner 一个就是新闻的集合
public class ContentsAdapter extends BaseAdapter {
    //banner 数据
    private List<BannerBean.DataBean> mBanner;
    //新闻数据
    private List<NewsBean.ResultBean> mNews;
    //上下文
    private Context context;

    public ContentsAdapter(Context context) {
        this.context = context;
        mNews = new ArrayList<>();
        mBanner = new ArrayList<>();
    }
    //更新banner
    public void setmBanner(List<BannerBean.DataBean> Banner) {
        //先前空 在加载
        mBanner.clear();
        if (Banner != null) {
            mBanner.addAll(Banner);
        }
        //刷新
        notifyDataSetChanged();
    }
    //更新新闻数据 （下拉）
    public void setmNews(List<NewsBean.ResultBean> News) {
        //先清空原来的数据
        mNews.clear();
        if (News != null){
            mNews.addAll(News);
        }
        //刷新
        notifyDataSetChanged();
    }
    //追加数据 （上拉）
    public void addmNews(List<NewsBean.ResultBean> News){
        //直接加载数据
        if (News != null){
            //////////////////////////
            mNews.addAll(News);
            notifyDataSetChanged();
        }
    }

    //判断条目总数  （先判断有没有Banner ）
    private boolean hasBanner(){
        return mBanner.size()>0;
    }

    //判断总条目数
    @Override
    public int getCount() {
        //如果有banner的话 news条目数为总条目加一
        //如果没有的话 为  总条目数
        return hasBanner()?mNews.size()+1:mNews.size();
    }

    //根据一个索引（位置）获得该位置的对象
    @Override
    public NewsBean.ResultBean getItem(int position) {
        //判断一下Banner
        //  如果有 那么 news 的第一条数据就从索引1开始
        // 如果没有 从索引0 开始
        return mNews.get(hasBanner()? position -1 : position);
    }
   // 获取条目的id
    @Override
    public long getItemId(int position) {
        return position;
    }

    private final int ITEM_COUNT = 2;
    private final int BANNER_TYPE = 0;
    private final int NEWS_TYPE = 1;

    //方法返回的是 你有几种样式  返回时是 int类型
    @Override
    public int getViewTypeCount() {
        //返回的是两种条目
        return ITEM_COUNT;
    }
    //返回值是 你某一种样式的类型 是什么
    @Override
    public int getItemViewType(int position) {
        //判断某一条目的内容
        //position 为0   而且 banner
        //必须有数据的时候才能判断子条目是banner 还是news
        return position == 0 && hasBanner()?BANNER_TYPE : NEWS_TYPE;
    }
    //展示视图
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //判断视图
        if (getItemViewType(position) == BANNER_TYPE){
            //轮播图
            BannerVIewHolder viewHolder;
            if (convertView == null){
             convertView = LayoutInflater.from(context).inflate(R.layout.item_banner,parent,false);
             viewHolder = new BannerVIewHolder(convertView);
            }else {
                viewHolder = (BannerVIewHolder) convertView.getTag();
            }
            viewHolder.bindData(mBanner);
        }else {
            //新闻数据
            NewsViewHolder viewHolder;
            if (convertView == null){
                convertView = LayoutInflater.from(context).inflate(R.layout.news_item,parent,false);
                viewHolder = new NewsViewHolder(convertView);
            }else {
                viewHolder = (NewsViewHolder) convertView.getTag();
            }
            viewHolder.bindData(getItem(position));
        }

        return convertView;
    }


    //创建 BANNER的寄存器
    class BannerVIewHolder{
        ViewPager viewPager;

        private android.os.Handler handler = new android.os.Handler(){
            @Override
            public void handleMessage(Message msg) {
                viewPager.setCurrentItem(viewPager.getCurrentItem()+1);
                handler.sendEmptyMessageDelayed(0,2000);
            }
        };

        public BannerVIewHolder(View contentView){
            //获取banner的视图
            viewPager = contentView.findViewById(R.id.banner);
            contentView.setTag(this);
        }
        public void bindData(List<BannerBean.DataBean> datas){
            //先取消切换任务
            handler.removeCallbacksAndMessages(null);
            viewPager.setAdapter(new BannerAdapter(datas,context));
            //设置左右都能滑动  定位在中间
            viewPager.setCurrentItem(viewPager.getAdapter().getCount()/2);

            handler.sendEmptyMessageDelayed(0,2000);
        }
    }
    //创建 NEWS 的寄存器
    class NewsViewHolder{
        ImageView icon;
        TextView title;
        TextView summary;

        //获取资源ID
        public NewsViewHolder(View convertView){
            icon = convertView.findViewById(R.id.icon);
            title = convertView.findViewById(R.id.title);
            summary = convertView.findViewById(R.id.summary);
            convertView.setTag(this);
        }
        //绑定赋值  ImageView 和 TextView 控件
        // 绑定以后 把集合里的值 赋到控件中
        public void bindData(NewsBean.ResultBean data){
            //赋值
            title.setText(data.getName());
            summary.setText(data.getSummary());
            //图片
            ImageLoader.getInstance().displayImage(data.getImageUrl(),icon);
        }
    }
}

//新闻的bean类

package com.example.weektwo;
import java.util.List;
public class NewsBean {
    private String message;
    private String status;
    private List<ResultBean> result;
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
    public String getStatus() {
        return status;
    }
    public void setStatus(String status) {
        this.status = status;
    }
    public List<ResultBean> getResult() {
        return result;
    }
    public void setResult(List<ResultBean> result) {
        this.result = result;
    }
    public static class ResultBean {
        private boolean followMovie;
        private int id;
        private String imageUrl;
        private String name;
        private int rank;
        private String summary;
        public boolean isFollowMovie() {
            return followMovie;
        }
        public void setFollowMovie(boolean followMovie) {
            this.followMovie = followMovie;
        }
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getImageUrl() {
            return imageUrl;
        }
        public void setImageUrl(String imageUrl) {
            this.imageUrl = imageUrl;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public int getRank() {
            return rank;
        }
        public void setRank(int rank) {
            this.rank = rank;
        }
        public String getSummary() {
            return summary;
        }
        public void setSummary(String summary) {
            this.summary = summary;
        }
    }
}

//App 设置图片

package com.example.weektwo;

import android.app.Application;
import android.graphics.Bitmap;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;

public class App extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        //初始化
        ImageLoader.getInstance().init(
           new ImageLoaderConfiguration.Builder(this)
                //图片缓存后的大小
                .diskCacheSize(50*1024*1024)
                //内存缓存的最大值  百分数
                .memoryCacheSizePercentage(13)
                .defaultDisplayImageOptions(
                      // 通过DisplayImageOptions这个类 设置图片的各种格式
                    new DisplayImageOptions.Builder()
                    .cacheInMemory(true)//设置下载的图片是否缓存在内存中
                    .cacheOnDisc(true)//设置下载的图片是否缓存在SD卡中
                    .bitmapConfig(Bitmap.Config.ARGB_4444)//设置色彩模式
                    //设置下载过程中图片显示
                    .showImageOnLoading(R.mipmap.ic_launcher)
                    //设置图片加载或解码过程中发生错误显示的图片
                    .showImageOnFail(R.mipmap.ic_launcher)
                    //设置图片Uri为空或是错误的时候显示的图片
                    .showImageForEmptyUri(R.mipmap.ic_launcher)
                    //设置圆角
                    .displayer(new RoundedBitmapDisplayer(16))
                    .build()
                )
                .build()
        );
    }
}

//轮播图适配器

package com.example.weektwo;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.List;

public class BannerAdapter extends PagerAdapter {

    private List<BannerBean.DataBean> list;
    private Context context;

    public BannerAdapter(List<BannerBean.DataBean> list, Context context) {
        this.list = list;
        this.context = context;
    }
    //设置总条目
    @Override
    public int getCount() {
        return 5000;
    }
    //判断容器里的View是否与一个key值相关联
    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
        return view == o;
    }

    @NonNull
    @Override
    //实例化item，PagerAdapter将选择将这个对象填充到在当前ViewPager里
    public Object instantiateItem(@NonNull ViewGroup container, int position) {

        ImageView imageView = new ImageView(context);

        //图片拉伸
        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
        //加载视图
        container.addView(imageView);

        ImageLoader.getInstance().displayImage(list.get(position%list.size()).getIconNoHttps(),imageView, (DisplayImageOptions) null);
        return imageView;
    }
    //将item从指定的位置移出容器
    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((View) object);
    }
}

//轮播bean类

package com.example.weektwo;
import java.util.List;
public class BannerBean {
    private String msg;
    private String code;
    private List<DataBean> data;
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
    public String getCode() {
        return code;
    }
    public void setCode(String code) {
        this.code = code;
    }
    public List<DataBean> getData() {
        return data;
    }
    public void setData(List<DataBean> data) {
        this.data = data;
    }
    public static class DataBean {
        private int aid;
        private String createtime;
        private String icon;
        private Object productId;
        private String title;
        private int type;
        private String url;
        public int getAid() {
            return aid;
        }
        public void setAid(int aid) {
            this.aid = aid;
        }
        public String getCreatetime() {
            return createtime;
        }
        public void setCreatetime(String createtime) {
            this.createtime = createtime;
        }
        public String getIcon() {
            return icon;
        }
        public void setIcon(String icon) {
            this.icon = icon;
        }
	//吧htts 给成Http
        public String getIconNoHttps(){
            return icon.replace("https","http");
        }
        public Object getProductId() {
            return productId;
        }
        public void setProductId(Object productId) {
            this.productId = productId;
        }
        public String getTitle() {
            return title;
        }
        public void setTitle(String title) {
            this.title = title;
        }
        public int getType() {
            return type;
        }
        public void setType(int type) {
            this.type = type;
        }
        public String getUrl() {
            return url;
        }
        public void setUrl(String url) {
            this.url = url;
        }
    }
}

//XML

MAIn
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.example.xlistview2.me.maxwin.view.XListView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:id="@+id/contents"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        ></com.example.xlistview2.me.maxwin.view.XListView>
</android.support.constraint.ConstraintLayout>


//news 视图
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <ImageView
        android:id="@+id/icon"
        android:layout_width="140dp"
        android:layout_height="100dp"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        />
    <TextView
        android:id="@+id/title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="text"
        app:layout_constraintTop_toTopOf="@+id/icon"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/icon"
        />
    <TextView
        android:id="@+id/summary"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="t t"
        android:maxLines="3"
        app:layout_constraintBottom_toBottomOf="@id/icon"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@id/icon"
        />
</android.support.constraint.ConstraintLayout>


//banner  视图  
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <android.support.v4.view.ViewPager
        android:id="@+id/banner"
        android:layout_width="0dp"
        android:layout_height="200dp"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        ></android.support.v4.view.ViewPager>
</android.support.constraint.ConstraintLayout>