PullToRefreshListView实现多条目加载上拉刷新和下拉加载

本文实例为大家分享了Android九宫格图片展示的具体代码，供大家参考，具体内容如下

XML布局

主页面main布局

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

pulllist布局

<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"
 />

java代码

App页面

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);
 }
}

MainActivity页面

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;
 }
 }

来源：https://blog.csdn.net/dp666666/article/details/78481938