PullToRefreshListView实现多条目加载上拉刷新和下拉加载

 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 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() { @Override //上拉 public void onPullDownToRefresh(PullToRefreshBase 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 refreshView) { i = i + 20;new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=" + i); } }); } class MyAsyncTask extends AsyncTask { @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 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; } }