PullToRefreshListView上拉下拉刷新

//main方法

import android.os.Handler;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ListView;import com.example.day16.Bean.ResultBean;import com.example.day16.Utils.MyTask;import com.example.day16.adapter.MyAdapter;import com.google.gson.Gson;import com.handmark.pulltorefresh.library.ILoadingLayout;import com.handmark.pulltorefresh.library.PullToRefreshBase;import com.handmark.pulltorefresh.library.PullToRefreshListView;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private PullToRefreshListView pullToRefreshListView;    private List<ResultBean.NewslistBean> list=new ArrayList<>();    private Handler myHandler = new Handler();    private MyAdapter adapter;    private  int index=1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        pullToRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_lv);        //设置刷新加载        SetPtrLv();        //初始化数据        initData();    }    //初始化数据    public void initData(){       MyTask myTask=new MyTask(new MyTask.Icallbacks() {           @Override           public void updateUiByjson(String jsonstr) {                         Gson gson=new Gson();               ResultBean resultBean = gson.fromJson(jsonstr, ResultBean.class);               List<ResultBean.NewslistBean> newslist = resultBean.getNewslist();               list.addAll(newslist);               //设置数据               setAdapter();           }       });        myTask.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1");    }    //上拉加载    private  void addtoBottom(){        MyTask myTask=new MyTask(new MyTask.Icallbacks() {            @Override            public void updateUiByjson(String jsonstr) {                Gson gson=new Gson();                ResultBean resultBean = gson.fromJson(jsonstr, ResultBean.class);                List<ResultBean.NewslistBean> newslist = resultBean.getNewslist();                list.addAll(newslist);            }        });        index++;        myTask.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+index);    }    //下拉刷新    private void addtoTop(){        MyTask myTask=new MyTask(new MyTask.Icallbacks() {            @Override            public void updateUiByjson(String jsonstr) {                Gson gson=new Gson();                ResultBean resultBean = gson.fromJson(jsonstr, ResultBean.class);                List<ResultBean.NewslistBean> newslist = resultBean.getNewslist();//                list.addAll(0,newslist);                list.clear();                list.addAll(newslist);            }        });        myTask.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1");    }    private void setAdapter(){       if(adapter==null){        adapter=new MyAdapter(this,list);        pullToRefreshListView.setAdapter(adapter);       }else{           adapter.notifyDataSetChanged();       }    }    private void SetPtrLv() {        //设置刷新模式        pullToRefreshListView.setMode(PullToRefreshBase.Mode.BOTH);        /**这里通过getLoadingLayoutProxy 方法来指定上拉和下拉时显示的状态的区别，         * 第一个true 代表下来状态 ，第二个true 代表上拉的状态         如果想区分上拉和下拉状态的不同，可以分别设置*/        ILoadingLayout startLabels = pullToRefreshListView.getLoadingLayoutProxy(true, false);        startLabels.setPullLabel("下拉刷新");        startLabels.setRefreshingLabel("正在拉");        startLabels.setReleaseLabel("放开刷新");        ILoadingLayout endLabels = pullToRefreshListView.getLoadingLayoutProxy(false, true);        endLabels.setPullLabel("上拉刷新");        endLabels.setRefreshingLabel("正在载入...");        endLabels.setReleaseLabel("放开刷新...");        pullToRefreshListView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {            @Override            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {//下拉刷新的回调                //下拉刷新的数据，显示在listview列表的最上面                addtoTop();                myHandler.postDelayed(new Runnable() {                    @Override                    public void run() {                        //刷新完成，必须在异步下完成                        pullToRefreshListView.onRefreshComplete();                        //刷新适配器                        setAdapter();                    }                }, 1000);            }            @Override            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {//上拉加载的回调                //加载更多的数据，添加到集合列表的最后面                addtoBottom();                myHandler.postDelayed(new Runnable() {                    @Override                    public void run() {                        //刷新完成，必须在异步下完成                        pullToRefreshListView.onRefreshComplete();                        //刷新适配器                        setAdapter();                    }                }, 1000);            }        });    }} //适配器
public class MyAdapter extends BaseAdapter {    private Context context;    private List<ResultBean.NewslistBean> list;    public MyAdapter(Context context, List<ResultBean.NewslistBean> list) {        this.context = context;        this.list = list;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int position) {        return list.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder holder;        if(convertView==null){            convertView=View.inflate(context, R.layout.item,null);            holder=new ViewHolder();            holder.imageView= (ImageView) convertView.findViewById(R.id.img);            holder.textView= (TextView) convertView.findViewById(R.id.tv);            convertView.setTag(holder);        }else{            holder= (ViewHolder) convertView.getTag();        }          holder.textView.setText(list.get(position).getTitle());         ImageLoader.getInstance().displayImage(list.get(position).getPicUrl(),holder.imageView, ImageloaderUtil.getImageOptions());        return convertView;    }    class ViewHolder{        ImageView imageView;        TextView textView;    }}


//bean包解析的数据
public class ResultBean {    /**     * code : 200     * msg : success     * newslist : [{"ctime":"2017-10-19","title":"让步，是涵养，也是善良！","description":"中国新闻网","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-35939643.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392830&signature=gYnmAYHNvNo89UvsFp3J-HmGbryQlgpZiQTPTnPAFXBB6ONG9fHlmHeRv6-MwSCIt9tjpk1OpyoeKMWEFTWc0EzmTNBXUx5KN5Kw3AFnunQ="},{"ctime":"2017-10-19","title":"一群北大清华医学学霸开了家\u201c柳叶刀\u201d烧烤店，结果《柳叶刀》主编真的来吃了\u2026\u2026","description":"中国日报","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-53210239.static/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392829&signature=N2PGRhHbYwzRHFdS7JhFgFCFuPKZCky*g*csWBITxpMTHksiowkOUJSDRcmAEWWOiOKYxhFyq0yobrkTzCJsEBjlSfxGqlP7PgwkpnNqEk0="},{"ctime":"2017-10-19","title":"同样是猫头鹰，差别咋就这么大捏？","description":"动物世界","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55363306.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392829&signature=aF6YAkKWtxrCqnlh3tlKvhZ8ZnpPmj1I9iblTtvmxZ2zMAt3w6anSBpqnRk86kRneghrrpqDHUCLy*rrlPqtcpkm*een8ypt-cyi3qaAGVQ="},{"ctime":"2017-10-19","title":"动物世界犬种-牛头梗","description":"动物世界","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55363291.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392829&signature=vIBu1M3tp0o4CSUYct3-n*dyf8JKYFZ8GEPXx5IPMocbASAS-qLYzNN1X08DeyB5tp4q8CBGUG1L51GKd1J685fsBbGLf1aozoHYSBs0Law="},{"ctime":"2017-10-19","title":"独家 | 8斤以上\u201c巨大儿\u201d属于病理性体重！专家这样解释原因","description":"嘉定报社","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55363141.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392828&signature=Bkr0588AC*w9YAVLgp4fqVo*kJ*S3l7aYPISCsTbyc*TRBCFEI4IG2ZwRgd8CLcH2pkCVdi5W7H9gpu3FnY3G8crvwzJcumEurGY0qXwkso="},{"ctime":"2017-10-19","title":"重磅 | 总分150！你给你家小区打几分？","description":"嘉定报社","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-36596651.static/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392828&signature=laK6fjPmTixJdH*L4YKzT4QoUmFO7s6YHmKPXVLANtTcZywTQldtyHWxzJnjsZ41OWICxCSpRJqglns9a-VW7AXPbYk42b1KKv4qQxacR-c="},{"ctime":"2017-10-19","title":"【陇南故事会】不知道你对三妻四妾这种传统怎么看？","description":"陇南都市网","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-19458195.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392827&signature=jskRpa-TqyThbvz-Sge59PpLZxbnoRfxiquep243Benoex41BSc8we0P4BD5IgulKz2YIG8fi0weLGsKryN*Fx8YqC9KO3LljkAYR88zqnc="},{"ctime":"2017-10-19","title":"我的世界，你曾经来过","description":"散文吧美丽如雪","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-37618338.static/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392827&signature=gaQsYJN9x0WhLVM166mMfkgoVmVC6hKfmvA3A1mE7R6STDKPLBSRvezdzOgt1Hhb*xIuiBp5h1gLO8rpWo6q-MvByH5vzNGw8xJoZh6TyuA="},{"ctime":"2017-10-19","title":"陇南没考驾照的恭喜了！央视传来大消息... ?","description":"陇南都市网","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-19458195.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392827&signature=0mmcBR-tBhJww81w*6KKn0fMJIFAxUgeAmTlHgB4OfsvT7U7KeZfVA-oX9YlpoDgX4Hfn1RDvJXaABAzzFf3kLNjsG5qcqVAGxWZWrZpYCs="},{"ctime":"2017-10-19","title":"封面 |我喜欢好看的皮囊，也喜欢她善良的心","description":"陇南都市网","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-52003529.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392827&signature=32tc2KpGVVYucsDmesoMtU-nfD7cH*KSUiunmofrGeGMKAw5ttNM7N6AobSgqqpco68jeBayCGMFNwY1w2f7nBhVaRD09aAotfhgai-3qZw="}]     */    private int code;    private String msg;    private List<NewslistBean> newslist;    public int getCode() {        return code;    }    public void setCode(int code) {        this.code = code;    }    public String getMsg() {        return msg;    }    public void setMsg(String msg) {        this.msg = msg;    }    public List<NewslistBean> getNewslist() {        return newslist;    }    public void setNewslist(List<NewslistBean> newslist) {        this.newslist = newslist;    }    public static class NewslistBean {        /**         * ctime : 2017-10-19         * title : 让步，是涵养，也是善良！         * description : 中国新闻网         * picUrl : https://zxpic.gtimg.com/infonew/0/wechat_pics_-35939643.jpg/640         * url : https://mp.weixin.qq.com/s?src=16&ver=436&timestamp=1508392830&signature=gYnmAYHNvNo89UvsFp3J-HmGbryQlgpZiQTPTnPAFXBB6ONG9fHlmHeRv6-MwSCIt9tjpk1OpyoeKMWEFTWc0EzmTNBXUx5KN5Kw3AFnunQ=         */        private String ctime;        private String title;        private String description;        private String picUrl;        private String url;        public String getCtime() {            return ctime;        }        public void setCtime(String ctime) {            this.ctime = ctime;        }        public String getTitle() {            return title;        }        public void setTitle(String title) {            this.title = title;        }        public String getDescription() {            return description;        }        public void setDescription(String description) {            this.description = description;        }        public String getPicUrl() {            return picUrl;        }        public void setPicUrl(String picUrl) {            this.picUrl = picUrl;        }        public String getUrl() {            return url;        }        public void setUrl(String url) {            this.url = url;        }    }}



//工具包
public class ImageloaderUtil {    /**     * ImageLoader的配置     * @param context     */    public static void initConfig(Context context) {        //配置//        File cacheFile=context.getExternalCacheDir();        File cacheFile= new File(Environment.getExternalStorageDirectory()+"/"+"imgages");        ImageLoaderConfiguration config=new ImageLoaderConfiguration.Builder(context)                .memoryCacheExtraOptions(480, 800)//缓存图片最大的长和宽                .threadPoolSize(2)//线程池的数量                .threadPriority(4)                .memoryCacheSize(2*1024*1024)//设置内存缓存区大小                .diskCacheSize(20*1024*1024)//设置sd卡缓存区大小                .diskCache(new UnlimitedDiskCache(cacheFile))//自定义缓存目录                .writeDebugLogs()//打印日志内容                .diskCacheFileNameGenerator(new Md5FileNameGenerator())//给缓存的文件名进行md5加密处理                .build();        ImageLoader.getInstance().init(config);    }    /**     * 获取图片设置类     * @return     */    public static DisplayImageOptions getImageOptions(){        DisplayImageOptions optionsoptions=new DisplayImageOptions.Builder()                .cacheInMemory(true)//使用内存缓存                .cacheOnDisk(true)//使用磁盘缓存                .bitmapConfig(Bitmap.Config.RGB_565)//设置图片格式                .build();        return optionsoptions;    }}


//工具包
public class MyTask extends AsyncTask<String,Void,String> {    //申请一个接口类对象    private  Icallbacks icallbacks;    //将无参构造设置成私有的，使之在外部不能够调用    private MyTask(){}    //定义有参构造方法    public MyTask(Icallbacks icallbacks) {        this.icallbacks = icallbacks;    }    @Override    protected String doInBackground(String... params) {        String str="";        try {             //使用HttpUrlConnection            URL url=new URL(params[0]);            HttpURLConnection connection=(HttpURLConnection) url.openConnection();            connection.setRequestMethod("GET");            connection.setReadTimeout(5000);            connection.setConnectTimeout(5000);            if(connection.getResponseCode()==200){                InputStream inputStream=connection.getInputStream();                //调用工具类中的静态方法                str=StreamToString.streamToStr(inputStream,"utf-8");            }        } catch (MalformedURLException e) {            e.printStackTrace();        }catch (IOException e){            e.printStackTrace();        }        return str;    }    @Override    protected void onPostExecute(String s) {        super.onPostExecute(s);        //解析，封装到bean,更新ui组件        icallbacks.updateUiByjson(s);    }    //定义一个接口    public interface Icallbacks{        /**         * 根据回传的json字符串，解析并更新页面组件         * @param jsonstr         */        void updateUiByjson(String jsonstr);    }}



//工具包

public class StreamToString {    public static String streamToStr(InputStream inputStream,String chartSet){        StringBuilder builder=new StringBuilder();        try {            BufferedReader br=new BufferedReader(new InputStreamReader(inputStream,chartSet));            String con;            while ((con=br.readLine())!=null){                builder.append(con);            }            br.close();            return builder.toString();        } catch (Exception e) {            e.printStackTrace();        }        return "";    }}

//调用工具包

public class MyAppaciton extends Application {    @Override    public void onCreate() {        super.onCreate();        ImageloaderUtil.initConfig(this);    }}

//activity-main

<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:ptr="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="com.example.day16.MainActivity">    <com.handmark.pulltorefresh.library.PullToRefreshListView        android:id="@+id/pull_lv"        ptr:ptrAnimationStyle="flip"        ptr:ptrDrawable="@drawable/default_ptr_flip"        ptr:ptrHeaderBackground="#383838"        ptr:ptrHeaderTextColor="#FFFFFF"        android:layout_width="match_parent"        android:layout_height="match_parent">    </com.handmark.pulltorefresh.library.PullToRefreshListView></RelativeLayout>

//item

<?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">    <ImageView        android:layout_width="100dp"        android:layout_height="100dp"        android:id="@+id/img"        android:src="@mipmap/ic_launcher"        />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/tv"        android:textSize="25dp"        android:text="1511"        android:layout_marginLeft="20dp"        /></LinearLayout>

//加权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

android:name=".MyAppaciton"