Android使用ListView实现下拉刷新及上拉显示更多的方法

本文实例讲述了android使用listview实现下拉刷新及上拉显示更多的方法。分享给大家供大家参考，具体如下：

今天得需求是做listview+上下拉动在header和footer显示progressdialog，但不影响用户操作

直接上代码，我已经加上注释了，自己看。

package com.stay.main;
import java.net.httpurlconnection;
import java.util.arraylist;
import java.util.hashmap;
import org.json.jsonobject;
import android.app.activity;
import android.app.progressdialog;
import android.graphics.drawable.drawable;
import android.os.bundle;
import android.os.handler;
import android.os.handlerthread;
import android.os.looper;
import android.os.message;
import android.view.layoutinflater;
import android.view.view;
import android.widget.abslistview;
import android.widget.abslistview.onscrolllistener;
import android.widget.button;
import android.widget.linearlayout;
import android.widget.listview;
import android.widget.relativelayout;
import android.widget.textview;
import com.stay.wifi.r;
/**
 * @author stay
 * 动态加载listview数据，上拉 刷新，下拉 更多
 */
public class listviewactivity extends activity implements onscrolllistener {
  private static final int load = 0;
  private static final int error = 0;
  private static final int member = 1;
  private static final int loaded = 2;
  private static final int dialog = 3;
  private static final int full = 4;
  private nearbyadapter adapter;
  private listview nearby_lv;
  private relativelayout nearby_lv_header;
  private button list_bottom_btn;
  private linearlayout list_bottom_linear;
  private textview bottom_progress_text;
  private relativelayout nearby_lv_footer;
  private button list_header_btn;
  private linearlayout list_header_linear;
  private textview heard_progress_text;
  private arraylist<jsonobject> nearby_data = new arraylist<jsonobject>();
  private int lastitem;
  private hashmap<string, drawable> imagecache;
  private com.stay.main.listviewactivity.myhandler myhandler;
  private progressdialog dialog;
  private int curpage = 1;
  private boolean ismember = false;
  private int firstitem;
  public int count;
  /** called when the activity is first created. */
  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.main);
    initview();
    myhandler.sendemptymessage(load);
  }
  @override
  public void onscrollstatechanged(abslistview view, int scrollstate) {
    debugutil.debug("onscrollstatechanged");
    //当滚动停止且滚动的总数等于数据的总数，去加载
    if (lastitem == count && scrollstate == scroll_state_idle) {
      debugutil.debug("onscrollstatechanged--------next");
      if (curpage == 4 && !ismember) {
        debugutil.show(this, "您不是正式会员，请申请正式会员，");
        list_bottom_linear.setvisibility(view.gone);
      } else {
        //加载数据
        myhandler.sendemptymessage(load);
      }
      return;
    }
    //当往上拉时更新数据，将data清空然后去重新加载
    if (firstitem == 0 && scrollstate == scroll_state_idle) {
      debugutil.debug("onscrollstatechanged--------refresh");
      curpage = 0;
      myhandler.sendemptymessage(load);
    }
  }
  @override
  public void onscroll(abslistview view, int firstvisibleitem, int visibleitemcount, int totalitemcount) {
    debugutil.debug("firstvisibleitem=" + firstvisibleitem);
    debugutil.debug("visibleitemcount=" + visibleitemcount);
    debugutil.debug("totalitemcount=" + totalitemcount);
    //这里要减二，因为我加了header footer
    lastitem = firstvisibleitem + visibleitemcount - 2;
    firstitem = firstvisibleitem;
  }
  public int getdata() {
    try {
      httpurlconnection conn = downloadutil.download(url//自己写咯);
      arraylist<jsonobject> temp = jsonutil.streamtojsonlist(conn.getinputstream());
      if (curpage == 0 && nearby_data.size() > 0) {
        nearby_data.clear();
        count = 0;
      }
      if (temp != null && temp.size() > 0) {
        count += temp.size();
        nearby_data.addall(temp);
        debugutil.debug("nearby_data.size()="+nearby_data.size());
      } else {
        return full;
      }
      return loaded;
    } catch (exception e) {
      return error;
    }
  }
  private handler handler = new handler() {
    @override
    public void handlemessage(message msg) {
      super.handlemessage(msg);
      switch (msg.what) {
      case dialog:
        list_bottom_linear.setvisibility(view.visible);
        list_header_linear.setvisibility(view.visible);
        break;
      case loaded:
        list_bottom_linear.setvisibility(view.gone);
        list_header_linear.setvisibility(view.gone);
        curpage++;
        adapter.notifydatasetchanged();
        break;
      case error:
        debugutil.debug("error,missing data");
        break;
      case member:
        debugutil.debug("you must regist formal member");
        break;
      default:
        break;
      }
    }
  };
//创建子线程加载数据，然后更新
  private class myhandler extends handler {
    private int status;
    public myhandler(looper looper) {
      super(looper);
    }
    @override
    public void handlemessage(message msg) {
      synchronized (this) {
        switch (msg.what) {
        case load:// get data from server
          handler.sendemptymessage(dialog);//显示等待框
          status = getdata();
          handler.sendemptymessagedelayed(status, 1000);
          break;
        default:
          break;
        }
      }
    }
  }
  public void initview() {
    imagecache = new hashmap<string, drawable>();
    handlerthread handlerthread = new handlerthread("nearby");
    // 在使用handlerthread的getlooper()方法之前，必须先调用该类的start();
    handlerthread.start();
    myhandler = new myhandler(handlerthread.getlooper());
    nearby_lv = (listview) findviewbyid(r.id.nearby_lv);
    nearby_lv_footer = (relativelayout) layoutinflater.from(listviewactivity.this).inflate(r.layout.nearby_lv_header, null);
    list_bottom_btn = (button) nearby_lv_footer.findviewbyid(r.id.list_bottom_btn);
    list_bottom_linear = (linearlayout) nearby_lv_footer.findviewbyid(r.id.list_bottom_linear);
    bottom_progress_text = (textview) nearby_lv_footer.findviewbyid(r.id.progress_text);
    nearby_lv_header = (relativelayout) layoutinflater.from(listviewactivity.this).inflate(r.layout.nearby_lv_header, null);
    list_header_btn = (button) nearby_lv_header.findviewbyid(r.id.list_bottom_btn);
    list_header_linear = (linearlayout) nearby_lv_header.findviewbyid(r.id.list_bottom_linear);
    heard_progress_text = (textview) nearby_lv_header.findviewbyid(r.id.progress_text);
    list_header_btn.settext("刷新");
    list_bottom_btn.settext("更多");
    list_header_linear.setvisibility(view.gone);
    nearby_lv.addheaderview(nearby_lv_header);
    nearby_lv.addfooterview(nearby_lv_footer);
    // list_header_btn.setonclicklistener(header_click);
    adapter = new nearbyadapter(listviewactivity.this, nearby_data);
    nearby_lv.setadapter(adapter);
    nearby_lv.setonscrolllistener(listviewactivity.this);
  }
}

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希望本文所述对大家android程序设计有所帮助。