展示数据,上拉加载,下拉刷新,一定要导入library.

////////////////////////////主方法中的代码

private String name; private  String news_url;private List<news> newslist; private PullToRefreshListView lv; private   Myadap myadap; @Override public void onCreate(@Nullable Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     //接收传过来的URL     Bundle bundle=getArguments();     name= (String) bundle.get("name");     news_url= (String) bundle.get("url"); } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable final ViewGroup container, @Nullable Bundle savedInstanceState) {     View view=inflater.inflate(R.layout.pager_item,null);     lv= (PullToRefreshListView) view.findViewById(R.id.lv);     //设置上拉加载和下拉刷新     lv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener<ListView>() {         @Override         public void onRefresh(PullToRefreshBase<ListView> refreshView) {             getJson();             lv.onRefreshComplete();         }     });     lv.setOnLastItemVisibleListener(new PullToRefreshBase.OnLastItemVisibleListener() {         @Override         public void onLastItemVisible() {             Load();         }     });     //调用解析数据的方法     getJson();     return view; } private void getJson() {     new AsyncTask<String,Integer,String>(){         @Override         protected String doInBackground(String... params) {             String url=params[0];             String json=new NetHowoder().getjsonBy(url);             return json;         }         @Override         protected void onPostExecute(String s) {             super.onPostExecute(s);             Log.d("TAG",s+"-----------------");             Gson gson=new Gson();             UserBean userBean = gson.fromJson(s, UserBean.class);             newslist = userBean.getNewslist();             //设置适配器             myadap= new Myadap(getActivity(), newslist);             lv.setAdapter(myadap);             myadap.notifyDataSetChanged();         }     }.execute(news_url); } private  void Load(){     new AsyncTask<String,Integer,String>(){         @Override         protected String doInBackground(String... params) {             String url=params[0];             String json=new NetHowoder().getjsonBy(url);             return json;         }         @Override         protected void onPostExecute(String s) {             super.onPostExecute(s);             Log.d("TAG",s+"-----------------");             Gson gson=new Gson();             UserBean userBean = gson.fromJson(s, UserBean.class);             List<news> newslist3 = userBean.getNewslist();             newslist.addAll(newslist3);             myadap.notifyDataSetChanged();         }     }.execute(news_url); }

///////////////////////////////////////////////////XML布局中写上PullToRefreshListView

<com.handmark.pulltorefresh.library.PullToRefreshListView    xmlns:ptr="http://schemas.android.com/apk/res-auto"    android:id="@+id/lv"    android:layout_width="fill_parent"    android:layout_height="fill_parent"  />