PullToRefreshListView

public class MainActivity extends AppCompatActivity {
    private Myadapter myadapter;
    protected PullToRefreshListView pull_listview;
    private ImageView img;
    private DrawerLayout dv;
    private String urlpath="http://www.93.gov.cn/93app/data.do?channelId=0&startNum=0";
    private int p=1;
    private int q=0;
    private String url=urlpath+q;
    private List<Bean.DataBean> data=new ArrayList<>();


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        boolean conn = Utils.isConn(MainActivity.this);
        if (conn) {
            MyTask myTask = new MyTask();
            myTask.execute(url);

        } else {
            Utils.setNetworkMethod(MainActivity.this);

        }
        shuxi();

    }

    private void shuxi() {
        pull_listview.setMode(PullToRefreshListView.Mode.BOTH);
        ILoadingLayout startLabels = pull_listview.getLoadingLayoutProxy(true, false);
        startLabels.setPullLabel("下拉刷新...");
        startLabels.setRefreshingLabel("正在载入...");// 刷新时
        startLabels.setReleaseLabel("放开刷新...");// 下来达到一定距离时，显示的提示

        ILoadingLayout endLabels = pull_listview.getLoadingLayoutProxy(false, true);
        endLabels.setPullLabel("上拉刷新...");// 刚下拉时，显示的提示
        endLabels.setRefreshingLabel("正在载入...");// 刷新时
        endLabels.setReleaseLabel("放开刷新...");// 下来达到一定距离时，显示的提示
       pull_listview.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
           @Override
           public void onPullDownToRefresh(PullToRefreshBase<ListView> pullToRefreshBase) {
               p=1;
               q=0;
               url=urlpath+q;
               MyTask myTask = new MyTask();
               myTask.execute(url);
           }

           @Override
           public void onPullUpToRefresh(PullToRefreshBase<ListView> pullToRefreshBase) {
               p=2;
               q++;
               url=urlpath+q;
               MyTask myTask = new MyTask();
               myTask.execute(url);
           }
       });
    }

    class MyTask extends AsyncTask<String,Void,String>
    {



        @Override
        protected String doInBackground(String... strings) {
            StringBuilder builder=new StringBuilder();
            try {
                URL url=new URL(strings[0]);
                HttpURLConnection urlConnection =(HttpURLConnection) url.openConnection();
                urlConnection.setRequestMethod("GET");
                urlConnection.setReadTimeout(5000);
                urlConnection.setConnectTimeout(5000);
                if (urlConnection.getResponseCode()==200)
                {
                    InputStream inputStream = urlConnection.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                    String str="";
                    while ((str=reader.readLine())!=null)
                    {
                        builder.append(str);
                    }
                    reader.close();

                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return builder.toString();

        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Gson gson = new Gson();
            Bean bean = gson.fromJson(s, Bean.class);
            if (p==1)
            {
                data.clear();
            }
            data.addAll(bean.getData());
            setAdapter();
            if (p==1)
            {
                pull_listview.onRefreshComplete();
            }
            else {
                pull_listview.onRefreshComplete();

            }

        }
    }
    private void initView() {
        pull_listview = (PullToRefreshListView) findViewById(R.id.pull_listview);
        img = (ImageView) findViewById(R.id.img);
        dv = (DrawerLayout) findViewById(R.id.dv);
        ListView list_view = findViewById(R.id.list_view);
        List<String> list = new ArrayList<>();
        for (int i = 0; i <20 ; i++) {
            list.add("数据是"+i);
        }
        list_view.setAdapter(new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_list_item_1,android.R.id.text1,list));
     }
   public void setAdapter() {
       if (myadapter == null) {

           myadapter = new Myadapter(MainActivity.this, data);
           pull_listview.setAdapter(myadapter);
       }
       else {
           myadapter.notifyDataSetChanged();

       }
   }

}