PullToRefresh引入依赖,布局，适配器ListView上拉加载下拉刷新

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使用PullToRefreshListView前 先在File-New-import Module 导入pulltoRefreshLibrary，
然后给项目 添加 module的依赖，

选择pulltoRefreshLibrary

activity_main.xml 

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

适配器里面的

public class MyAdapter extends BaseAdapter{List<DBean.NewslistBean> list;Context context;public MyAdapter(List<DBean.NewslistBean> list, Context context) {this.context = context;this.list = list;ImageLoaderConfiguration configuration = ImageLoaderConfiguration.createDefault(context);ImageLoader.getInstance().init(configuration);}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int i) {return list.get(i);}@Overridepublic long getItemId(int i) {return i;}@Overridepublic View getView(int i, View view, ViewGroup viewGroup) {ViewHolder holder;if (view==null){view = View.inflate(context,R.layout.list_item,null);holder = new ViewHolder();holder.imageView = view.findViewById(R.id.list_image);holder.textView = view.findViewById(R.id.list_text);view.setTag(holder);}else{holder = (ViewHolder) view.getTag();}holder.textView.setText(list.get(i).getTitle());ImageLoader.getInstance().displayImage(list.get(i).getPicUrl(),holder.imageView);return view;}class ViewHolder{ImageView imageView;TextView textView;}
}

MainActivity里面的

public class MainActivity extends AppCompatActivity { private List<DBean.NewslistBean> list = new ArrayList<>(); private PullToRefreshListView refreshListView;int num = 1;   private MyAdapter myAdapter;    private ILoadingLayout endlabels; private ILoadingLayout startlabels; @Override  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main);     refreshListView = (PullToRefreshListView) findViewById(R.id.refresh_list_view);       getDataFromNet();        //设置PullToRefreshListView刷新模式,上拉下拉都可以       refreshListView.setMode(PullToRefreshBase.Mode.BOTH);        //设置刷新显示的状态,可以下拉,不能上拉      startlabels = refreshListView.getLoadingLayoutProxy(true,false);    startlabels.setRefreshingLabel("正在刷新");      startlabels.setPullLabel("下拉刷新");       startlabels.setReleaseLabel("松开刷新");     endlabels = refreshListView.getLoadingLayoutProxy(false,true);      endlabels.setRefreshingLabel("正在加载");       endlabels.setPullLabel("上拉加载");       endlabels.setReleaseLabel("松开加载");       //设置监听事件       refreshListView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {   @Override           //下拉刷新调用          public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {             num =1;              //获取数据            getDataFromNetxiala();            setAdapter();           }         @Override        //上拉加载调用     public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {   num++;    getDataFromNet();       setAdapter();         }     });  }   private void setAdapter() {      if (myAdapter==null) {        myAdapter = new MyAdapter(list, MainActivity.this);     refreshListView.setAdapter(myAdapter);      }else{     myAdapter.notifyDataSetChanged();     }   }   private void getDataFromNet() {   AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {  @Override          protected String doInBackground(Void... voids) {   String path = "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+num;        try {                  URL url = new URL(path);                HttpURLConnection connection = (HttpURLConnection) url.openConnection();  connection.setRequestMethod("GET");          connection.setConnectTimeout(5000);                 connection.setReadTimeout(5000);                  int responseCode = connection.getResponseCode();             if (responseCode==200){                    InputStream inputStream = connection.getInputStream();                 String json = streamtoString(inputStream,"utf-8");                 Thread.sleep(2000);                 return json;                }             } catch (Exception e) {  e.printStackTrace();             }              return null;     }         @Override   protected void onPostExecute(String json) {    Gson gson = new Gson();             DBean dBean = gson.fromJson(json, DBean.class);     list.addAll(dBean.getNewslist());              long currentTimeMillis = System.currentTimeMillis();      Date date2= new Date(currentTimeMillis);             SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");      String format = dateFormat.format(date2);              //设置刷新的时间              endlabels.setLastUpdatedLabel(format);        //停止刷新              refreshListView.onRefreshComplete();    setAdapter();      }       };      asyncTask.execute(); }  private void getDataFromNetxiala() {   AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {  @Override        protected String doInBackground(Void... voids) {       String path = "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+num;       try {              URL url = new URL(path);                 HttpURLConnection connection = (HttpURLConnection) url.openConnection();        connection.setRequestMethod("GET");              connection.setConnectTimeout(5000);               connection.setReadTimeout(5000);                 int responseCode = connection.getResponseCode();              if (responseCode==200){                     InputStream inputStream = connection.getInputStream();           String json = streamtoString(inputStream,"utf-8");                    Thread.sleep(2000);                     return json;                   }              } catch (Exception e) {     e.printStackTrace();       }              return null;      }          @Override         protected void onPostExecute(String json) {   Gson gson = new Gson();           DBean dBean = gson.fromJson(json, DBean.class);     list.addAll(0,dBean.getNewslist());             long currentTimeMillis = System.currentTimeMillis();  Date date2= new Date(currentTimeMillis);            SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");   String format = dateFormat.format(date2);             //设置刷新的时间            startlabels.setLastUpdatedLabel(format);     //停止刷新               refreshListView.onRefreshComplete();     setAdapter();          }     };      asyncTask.execute();  }   private String streamtoString(InputStream inputStream, String charset) {    try {    InputStreamReader inputStreamReader = new InputStreamReader(inputStream, charset);        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);      String s= null;        StringBuilder builder = new StringBuilder();      while((s=bufferedReader.readLine())!=null){     builder.append(s);           }           return builder.toString();     } catch (Exception e) {   e.printStackTrace();      }        return charset;   }}

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