PullToRefreshListView实现多条目加载上拉刷新和下拉加载

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

<ImageView  android:layout_width="120dp"  android:layout_height="100dp"  android:id="@+id/iv"  /><TextView  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:id="@+id/tv"  />

package com.example.duanpengpenglx20171108;import android.app.Application;import com.nostra13.universalimageloader.cache.memory.impl.UsingFreqLimitedMemoryCache;import com.nostra13.universalimageloader.core.DisplayImageOptions;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;import com.nostra13.universalimageloader.core.assist.QueueProcessingType;import com.nostra13.universalimageloader.core.download.BaseImageDownloader;/** * Created by 朋 on 2017/11/8. */public class App extends Application {  @Override  public void onCreate() {    super.onCreate();    ImageLoaderConfiguration config = new ImageLoaderConfiguration        .Builder(this)        .memoryCacheExtraOptions(480,800)        .threadPoolSize(5)        .threadPriority(Thread.NORM_PRIORITY - 2)        .denyCacheImageMultipleSizesInMemory()        .memoryCache(new UsingFreqLimitedMemoryCache(2 * 1024 * 1024)) // You can pass your own memory cache implementation/你可以通过自己的内存缓存实现        .memoryCacheSize(2 * 1024 * 1024)        .tasksProcessingOrder(QueueProcessingType.LIFO)        .defaultDisplayImageOptions(DisplayImageOptions.createSimple())        .imageDownloader(new BaseImageDownloader(this, 5 * 1000, 30 * 1000)) // connectTimeout (5 s), readTimeout (30 s)超时时间        .writeDebugLogs() // Remove for release app        .build();//开始构建//初始化imageloader;    ImageLoader.getInstance().init(config);  }}

public class MainActivity extends AppCompatActivity {  List<Jbean.DataBean> arr = new ArrayList();  private View view;  private ListView lv;  private Adapter adapter;  int i = 0;  private PullToRefreshListView pull;  private Adapter adapter1;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    pull = (PullToRefreshListView) findViewById(R.id.pull);    pull.setMode(PullToRefreshBase.Mode.BOTH);    ListView lv = pull.getRefreshableView();    adapter1 = new Adapter();    lv.setAdapter(adapter1);    new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=0");    pull.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {      @Override      //上拉      public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {        arr.clear();        i = 0;        new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=" + i);      }      @Override      //下拉加载20条      public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {        i = i + 20;new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=" + i);      }    });  }  class MyAsyncTask extends AsyncTask<String, Void, String> {    @Override    protected String doInBackground(String... params) {      String string = "";      StringBuffer stringBuffer = new StringBuffer();      try {        URL url = new URL(params[0]);        URLConnection urlConnection = url.openConnection();        InputStream inputStream = urlConnection.getInputStream();        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));        while ((string = bufferedReader.readLine()) != null) {          stringBuffer.append(string);        }      } catch (Exception e) {        e.printStackTrace();      }      return stringBuffer.toString();    }    @Override    protected void onPostExecute(String s) {      super.onPostExecute(s);      Jbean fragone_bean = new Gson().fromJson(s, Jbean.class);      List<Jbean.DataBean> data = fragone_bean.getData();      arr.addAll(data);      adapter1.notifyDataSetChanged();      pull.onRefreshComplete();    }  }  class Adapter extends BaseAdapter {    @Override    public int getCount() {      return arr.size();    }    @Override    public Object getItem(int position) {      return arr.get(position);    }    @Override    public long getItemId(int position) {      return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {      Sj sj = new Sj();      Jbean.DataBean dataBean = arr.get(position);      if (convertView==null){        convertView = View.inflate(MainActivity.this,R.layout.pulllist,null);        sj.image=convertView.findViewById(R.id.iv);        sj.tv=convertView.findViewById(R.id.tv);        convertView.setTag(sj);      }else {        sj =(Sj) convertView.getTag();      }      sj.tv.setText(dataBean.getSUBTITLE());      DisplayImageOptions options = new DisplayImageOptions.Builder()          .cacheInMemory(true)          .cacheOnDisk(true)          .showImageOnLoading(R.drawable.zhengzaijiazai)          .showImageForEmptyUri(R.drawable.zhengzaijiazai)          .showImageOnFail(R.drawable.zhengzaijiazai)          .bitmapConfig(Bitmap.Config.RGB_565)          .build();      ImageLoader.getInstance().displayImage((String) dataBean.getIMAGEURL(),sj.image,options);      return convertView;    }  }  class Sj{    ImageView image;    TextView tv;  }  }