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PullToRefreshListView实现多条目加载上拉刷新和下拉加载

2019年07月29日  | 移动技术网IT编程  | 我要评论

深圳银饰批发,令计划儿子车祸内幕,李冰护理网

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;
  }
  }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。

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