android-------PullToRefresh 下拉和上拉簡單實現

/**
 * 接入PullToRefresh
 * 1.引入Library
 * 2.依賴model
 * 3. 佈局文件中使用可刷新的控件
 * 4. 設置可刷新監聽-->  mPullRefreshListView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>()
 * 設置可以上拉  mPullRefreshListView.setMode(PullToRefreshBase.Mode.BOTH);
 */

<com.handmark.pulltorefresh.library.PullToRefreshListView
    android:id="@+id/plv"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

==================================================================

public class MainActivity extends AppCompatActivity {
    String baseUrl = "http://www.93.gov.cn/93app/data.do?channelId=0&startNum=";
    private ArrayList<String> list = new ArrayList();
    private PullToRefreshListView plv;

    private int page = 0;
    private ArrayAdapter<String> mAdapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        plv = (PullToRefreshListView) findViewById(R.id.plv);
        plv.setMode(PullToRefreshBase.Mode.BOTH);//BOTH 設置支持上下拉
        getNetData(0);
        // 數據源  從網絡請求數據
        mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);
        plv.setAdapter(mAdapter);

        plv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            /**
             * 下拉刷新
             * @param pullToRefreshBase
             */
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> pullToRefreshBase) {
                list.clear();
                getNetData(0);

            }

            /**
             * 上拉加載
             * @param pullToRefreshBase
             */
            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> pullToRefreshBase) {
                // 請求新數據, 添加到大集合
                page++;
                getNetData(page);

            }
        });



    }

    /**
     * 請求網絡數據
     * @param page
     */
    private void getNetData( int page) {
        new MAsyncTask().execute(baseUrl+page);
    }

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

     @Override
     protected String doInBackground(String... strings) {
         return NetWordUtils.getNetjson(strings[0]);
     }

     @Override
     protected void onPostExecute(String s) {
         super.onPostExecute(s);

         Gson gson = new Gson();
         Product product = gson.fromJson(s, Product.class);
         List<Product.DataBean> dataTemp = product.getData();

         ArrayList<String> stringList = new ArrayList<>();//初始化一個空的字符串集合
         for (int i = 0; i <dataTemp.size() ; i++) {
             stringList.add(dataTemp.get(i).getTITLE());
         }
         list.addAll(stringList);
         mAdapter.notifyDataSetChanged();
         plv.onRefreshComplete(); //    讓刷新頭和刷新底部返回
     }
 }

}

NetUtil類：

        

public class NetWordUtils {

    private static String  tag = "NetWordUtils";
    /**
     * 獲取網絡json
     *
     * @param urlString
     * @return
     */
    public static String getNetjson(String urlString) {

        try {
            URL url = new URL(urlString);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");//若果是get請求可以不用配置; 其他請求必須配置
            urlConnection.setConnectTimeout(8000);//設置鏈接超時間

            InputStream inputStream = urlConnection.getInputStream();//獲取網絡返回的輸入流;

            //可拼接的字符串
            StringBuilder stringBuilder = new StringBuilder();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            String temp = "";
            while ((temp = bufferedReader.readLine()) != null) {
                stringBuilder.append(temp);
                temp = "";
            }
            //這個是網絡獲取的數據
            String data = stringBuilder.toString();
            Log.e(tag, "getData: " + data);
            return data;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }


    /**
     * 獲取網絡圖片的工具類
     *
     * @param urlString
     * @return
     */
    public static Bitmap getNetBitmap(String urlString) {

        try {
            //用URL封裝鏈接地址;
            URL url = new URL(urlString);
            //用url打開鏈接
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            //聯網的狀態碼
            int responseCode = urlConnection.getResponseCode();
            if(responseCode ==200){
                //鏈接上獲取輸入流
                InputStream inputStream = urlConnection.getInputStream();
                //把流直接轉換成bitmap(系統提供的BitmapFactory)
                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);//BitmapFactory是個工具類,系統提供的
                return bitmap;
            }else {
                Log.e(tag, "網絡狀態碼:: "+responseCode );
            }




        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;

    }


}

Bean類自己用Json解析。