PulltoRefresh上拉下拉+Imageloader

//mian主页面
import android.graphics.pdf.PdfDocument;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import com.example.lianxiyuekao.R;
import com.example.lianxiyuekao.adapter.MAdapter;
import com.example.lianxiyuekao.gsonbean.Bean;
import com.example.lianxiyuekao.utile.HttpUtile;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefresh ;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

import java.util.ArrayList;
import java.util.List;

public class Fragmenthome extends Fragment {

private PullToRefreshListView plv;
private List<Bean.DataBean> list=new ArrayList<>();
private MAdapter mAdapter;
private int page=1;
private String url;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view=inflater.inflate(R.layout.fragmenthome,container,false);
    plv = view.findViewById(R.id.plv);
    plv.setMode(PullToRefreshListView.Mode.BOTH);
    mAdapter = new MAdapter(getActivity(), list);
    url=getArguments().getString(\"url\");
    plv.setAdapter(mAdapter);
    new MyTask().execute(url+page);
    setListener();

    return view;
}

public void setListener(){
    plv.setOnRefreshListener(new PullToRefresh .OnRefreshListener2<ListView>() {
        @Override
        public void onPullDownToRefresh(PullToRefresh <ListView> refreshView) {
            page=1;
            list.clear();
            new MyTask().execute(url+page);

        }

        @Override
        public void onPullUpToRefresh(PullToRefresh <ListView> refreshView) {
            page++;
            new MyTask().execute(url+page);

        }
    });
}
class MyTask extends AsyncTask<String,Void,List<Bean.DataBean>>{

    @Override
    protected List<Bean.DataBean> doInBackground(String... strings) {
        try {
            String s = HttpUtile.get(strings[0]);
            Bean bean = new Gson().fromJson(s, Bean.class);
            return bean.getData();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(List<Bean.DataBean> resultBeans) {
        super.onPostExecute(resultBeans);
       list.addAll(resultBeans);
       mAdapter.notifyDataSetChanged();
        plv.onRefreshComplete();
    }
}

}
//madapter
import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget. Adapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.lianxiyuekao.R;
import com.example.lianxiyuekao.gsonbean.Bean;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisp ;

import java.util.ArrayList;
import java.util.List;

public class MAdapter extends Adapter {
private Context context;
private List<Bean.DataBean> list=new ArrayList<>();;
private final DisplayImageOptions display;
private ImageLoader imageLoader=ImageLoader.getInstance();

public MAdapter(Context context, List<Bean.DataBean> list) {
    this.context = context;
    this.list = list;

    display = new DisplayImageOptions.Builder()
            .cacheInMemory(true)
            .showImageForEmptyUri(R.mipmap.ic_launcher)
            .bitmapConfig(Bitmap.Config.ARGB_8888)
            .showImageOnFail(R.mipmap.ic_launcher)
            .disp (new RoundedBitmapDisp (20))
            .build();
}

@Override
public int getCount() {
    return list.size();
}

@Override
public   getItem(int position) {
    return list.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    Holder holder;
    if (convertView==null){
        holder=new Holder();
        convertView=LayoutInflater.from(context).inflate(R.layout.item,parent,false);
        holder.  =convertView.findViewById(R.id. );
        holder.image =convertView.findViewById(R.id.image);
        convertView.setTag(holder);
    }else{
        holder = (Holder) convertView.getTag();
    }
    holder. .setText(list.get(position).getNews_ ());
    imageLoader.displayImage(list.get(position).getPic_url(),holder.image,display);
    return convertView;
}
class Holder{

    ImageView image;
    TextView  ;
}

}
//app
import android.app.Application;

import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
ImageLoaderConfiguration imageLoader=ImageLoaderConfiguration.createDefault(this);
ImageLoader.getInstance().init(imageLoader);
}
}
//Utile
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLConnection;

public class HttpUtile {
public static String get(String urlStr) {
String result=\"\";

    try {
       URL url = new URL(urlStr);
        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
        httpURLConnection.setRequestMethod(\"GET\");
        httpURLConnection.setReadTimeout(5000);
        httpURLConnection.setConnectTimeout(5000);
        if (httpURLConnection.getResponseCode()==200){
            result=getInputStr(httpURLConnection.getInputStream());
        }
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (ProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }


    return result;
}

private static String getInputStr(InputStream inputStream) throws IOException {
    StringBuilder stringBuilder = new StringBuilder();
    BufferedReader isr = new BufferedReader(new InputStreamReader(inputStream));

        for (String temp=isr.readLine();temp!=null;temp=isr.readLine()){
            stringBuilder.append(temp);
        }

    return stringBuilder.toString();
}

}

//mian布局

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

//item布局