PullToRefresh,,,,,,上拉刷新，下拉加载
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//首先将library文件夹导入studio中，然后新建自己的工程，把library当做jar包一样导入新建的项目中，，，activity_main中ptr如果报错，就把下面一行代码复制到里面
xmlns:ptr="http://schemas.android.com/apk/res-auto"//导包imageLoader jar包和gson jar包//添加获取权限代码<uses-permission android:name="android.permission.INTERNET"></uses-permission>android:name=".MyApplication"activity_main布局中代码
<?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: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.samsung.sfl10193.MainActivity"> <com.handmark.pulltorefresh.library.PullToRefreshListView android:id="@+id/ptr_lv" android:layout_width="match_parent" android:layout_height="match_parent" ptr:ptrAnimationStyle="flip" ptr:ptrDrawable="@drawable/default_ptr_flip" ptr:ptrHeaderBackground="#383838" ptr:ptrHeaderTextColor="#FFFFFF"></com.handmark.pulltorefresh.library.PullToRefreshListView></android.support.constraint.ConstraintLayout><?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:gravity="center"> <ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/item_img" android:layout_gravity="center" android:layout_weight="1" /> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/item_text" android:layout_weight="1" /></LinearLayout>public class MainActivity extends AppCompatActivity { private PullToRefreshListView ptr_lv; private Handler myHandler = new Handler(); private PtrLvAdapter adapter; private List<Result.NewslistBean> lists = new ArrayList<>(); private int index = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //加载控件 initView(); //设置刷新加载 SetPtrLv(); //初始化数据 initData(); } //初始化数据 private void initData() { MyTaskUtil myTaskUtils = new MyTaskUtil(new MyTaskUtil.Icallbacks() { @Override public void updateUiByjson(String jsonstr) { Log.d("zzz", "999-" + jsonstr); Gson gson = new Gson(); Result result = gson.fromJson(jsonstr, Result.class); List<Result.NewslistBean> newslist = result.getNewslist(); Log.d("zzz", "999-" + newslist.size()); lists.addAll(newslist); //设置适配器 setAdapter(); } }); myTaskUtils.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1"); } //上拉加载 private void addtoBottom() { MyTaskUtil myTaskUtil = new MyTaskUtil(new MyTaskUtil.Icallbacks() { @Override public void updateUiByjson(String jsonstr) { Gson gson = new Gson(); Result json = gson.fromJson(jsonstr, Result.class); List<Result.NewslistBean> newslist = json.getNewslist(); lists.addAll(newslist); } }); index++; myTaskUtil.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=" +index); } //下拉刷新 private void addtoTop() { MyTaskUtil myTaskUtils = new MyTaskUtil(new MyTaskUtil.Icallbacks() { @Override public void updateUiByjson(String jsonstr) { Gson gson = new Gson(); Result result = gson.fromJson(jsonstr, Result.class); List<Result.NewslistBean> newslist = result.getNewslist(); lists.addAll(0, newslist); } }); myTaskUtils.execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1"); } //设置适配器 private void setAdapter() { if (adapter == null) { Log.d("zzz", "if--setadapter-" + lists.size()); adapter = new PtrLvAdapter(this, lists); ptr_lv.setAdapter(adapter); } else { Log.d("zzz", "else--setadapter-" + lists.size()); adapter.notifyDataSetChanged(); } } private void SetPtrLv() { //设置刷新模式 ptr_lv.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 = ptr_lv.getLoadingLayoutProxy(true, false); startLabels.setPullLabel("下拉刷新"); startLabels.setRefreshingLabel("正在拉"); startLabels.setReleaseLabel("放开刷新"); ILoadingLayout endLabels = ptr_lv.getLoadingLayoutProxy(false, true); endLabels.setPullLabel("上拉刷新"); endLabels.setRefreshingLabel("正在载入..."); endLabels.setReleaseLabel("放开刷新..."); ptr_lv.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 ptr_lv.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 ptr_lv.onRefreshComplete(); //刷新适配器 setAdapter(); } }, 1000); } }); } private void initView() { ptr_lv = (PullToRefreshListView) findViewById(R.id.ptr_lv); }}public class MyApplication extends Application{ @Override public void onCreate() { super.onCreate(); ImageLoaderUtil.initConfig(this); }}public class PtrLvAdapter extends BaseAdapter{ private Context context; private List<Result.NewslistBean> list; public PtrLvAdapter(Context context, List<Result.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_layout, null); holder = new ViewHolder(); holder.textView = (TextView) convertView.findViewById(R.id.item_text); holder.imageView = (ImageView) convertView.findViewById(R.id.item_img); 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 { TextView textView; ImageView imageView; }}public class ImageLoaderUtil { 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 UnlimitedDiscCache(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 .showImageOnLoading(R.mipmap.ic_launcher)//设置正在下载的图片 .showImageForEmptyUri(R.mipmap.ic_launcher)//url为空或请求的资源不存在时 .showImageOnFail(R.mipmap.ic_launcher)//下载失败时显示的图片 // .displayer(new RoundedBitmapDisplayer(30))//设置圆角，参数代表度数 .build(); return optionsoptions; }}public class MyTaskUtil extends AsyncTask<String,Void,String>{ 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 MyTaskUtil() { } //定义有参构造方法 public MyTaskUtil(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); }}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 ""; }}public class Result { /** * code : 200 * msg : success * newslist : [{"ctime":"2017-10-19","title":"小麦播期晚，千万要播浅！看完这篇，明年不减产！","description":"农资与市场杂志","picUrl":"https://t1.qpic.cn/mblogpic/48da2c609d0a7f9d083e/2000","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410836&signature=mykVLxrXARhNUrpeoJT8HjafUHDHN0NFxCK7rrtxam1HwvCDpPuGdMIcN2xh2UHl7nHdshyXLij0jtEdTroRt-dGPQ7TU5KpQF3*HXHjWKY="},{"ctime":"2017-10-19","title":"双十一快到了，中通、韵达宣布快递涨价！连云港什么情况？","description":"连云港发布","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55385892.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410836&signature=tUYCXV6aONWq60NPzE*CBPBm-I96VL1AbV*7PopQe6MP1-b-*hQ7pMHXvYFBqEHq3tlkiPTFOTCQ9VIbGQp6*lHo-J63CuXWkIscQC45tdw="},{"ctime":"2017-10-19","title":"【两会倒计时】2017河南农药信息交流暨农药（械）交易会与种子信息交流暨展览会即将开幕！","description":"农资与市场杂志","picUrl":"https://t1.qpic.cn/mblogpic/f01a972dbcc1060fd456/2000","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410835&signature=fkEgbwcXfT2Gswz7UdBtJy126y7GxoZqxwKHv1qCIQLkNogFXi8OS0m1TRRnk7UTW1vdWnrdNtd6enob92PSdAv7Hz3n1rAvQ0L8FyDwOJw="},{"ctime":"2017-10-19","title":"关于召开\u201c第二届学习型中国农资人\u201d 实战峰会的通知！","description":"农资与市场杂志","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55385946.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410835&signature=NjgIUctPqT1cDgbhZK62Ii8U5*ISzDE9MQ7fYyw1*hEW2UjN9dfZtoTmNPmhfBg2bFtvKYsczH9AniT7dAqS7ctEngvWJjdlYYmxCYx1A90="},{"ctime":"2017-10-19","title":"免费领毛线，为寒冷地区的贫困孩子织件毛衣！我们在寻找最有爱心的港城妈妈","description":"连云港发布","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55385947.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410835&signature=P*Tc-7ySPT7lbrx*NwXIdbuCIEWN*a8x1KTxFVJF-ogi-foRm8sFFsMF32RAXir2hn3AduumcUFwjbnd2Fk5h1V9pLzhD6ZBo*jOTPse-9Q="},{"ctime":"2017-10-19","title":"党的十九大报告擘画国防和军队建设壮阔蓝图","description":"讲武堂","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55385876.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410834&signature=h8M079hNBL4bA7b6SXSwwNsH57ubjfXPTEUuCflDYO-M6u4cI6bezG61*Ym2Q8RqsmEnzXXwVVLeVEj1ZV7qO-eRiT*KgMgsWZ7fo0PiRXQ="},{"ctime":"2017-10-19","title":"建设社会主义现代化强国 中国要干这100件大事","description":"讲武堂","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55385877.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410834&signature=pmu7Qucr2Wc7LC8x5uVy0ezfKZetLZ27ArLVVMhoVIh0NsL41hDSjKSgbDu0TIWY-15bht7uqdg-dpfVQ1qvcGuXYeywfmm8aN9oPCS1f-g="},{"ctime":"2017-10-19","title":"【观点】乔蓉：近期将维持调整态势","description":"第一财经谈股论金","picUrl":"https://t1.qpic.cn/mblogpic/34d9dfb75cfceb04a840/2000","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410834&signature=br*TobRczvF69E9pYUP6z3b9-1qzuYOm9Aj*yq3NHD3XhXJNC28mRx6WG2-lb0wazqVEt73n6kfYn2nq0Dmk2j6TYK38hXtAi6g*Mpju*WU="},{"ctime":"2017-10-19","title":"【健康】一周不吃早餐，身体什么样？这些器官集体\u201c罢工\u201d了","description":"第一财经谈股论金","picUrl":"https://t1.qpic.cn/mblogpic/f01a972dbcc1060fd456/2000","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410833&signature=vy4YsKsUU5DFNRPXQJx0FnvwCF18dGAV*NyeLAaEsEKbHTvIAVWdQEQU3ausfsFGutJmjtgvHUoyTwxeOSmxBOEZHCTNyhM1P8jrsaJXOrc="},{"ctime":"2017-10-19","title":"收藏！肿瘤科常用药物一览表","description":"医学界肿瘤频道","picUrl":"https://zxpic.gtimg.com/infonew/0/wechat_pics_-55385762.jpg/640","url":"https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410832&signature=2rmifN28bz*C*Wx*fhw7jxkra7DqkynQDKKGTuSOpG4uDsBp1Rg2SNQOgI1otHeg0KxTl7s-3nFAe9W06EhCCT2lCJOHQ2732MrcE-pA-MM="}] */ 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 : 小麦播期晚，千万要播浅！看完这篇，明年不减产！ * description : 农资与市场杂志 * picUrl : https://t1.qpic.cn/mblogpic/48da2c609d0a7f9d083e/2000 * url : https://mp.weixin.qq.com/s?src=16&ver=436×tamp=1508410836&signature=mykVLxrXARhNUrpeoJT8HjafUHDHN0NFxCK7rrtxam1HwvCDpPuGdMIcN2xh2UHl7nHdshyXLij0jtEdTroRt-dGPQ7TU5KpQF3*HXHjWKY= */ 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; } }}
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