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.c
4000
lass);
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"
/>