Android基于ListView实现类似Market分页加载效果示例

本文实例讲述了android基于listview实现类似market分页加载效果。分享给大家供大家参考，具体如下：

最近几天研究listview实现分页加载和滚动加载,发现可以用listview的onscroll方法来实现,直接上代码

listviewscroll.java

package zy.lucifer.listviewscroll;
import android.app.activity;
import android.os.bundle;
import android.util.log;
import android.view.gravity;
import android.view.view;
import android.view.viewgroup;
import android.widget.abslistview;
import android.widget.baseadapter;
import android.widget.linearlayout;
import android.widget.listview;
import android.widget.progressbar;
import android.widget.textview;
import android.widget.toast;
import android.widget.abslistview.onscrolllistener;
import android.widget.linearlayout.layoutparams;
public class listviewscroll extends activity {
  /** called when the activity is first created. */
  private layoutparams mlayoutparams = new linearlayout.layoutparams(
      linearlayout.layoutparams.wrap_content,
      linearlayout.layoutparams.wrap_content);
  /**
   * 设置布局显示目标最大化属性
   */
  private layoutparams fflayoutparams = new linearlayout.layoutparams(
      linearlayout.layoutparams.fill_parent,
      linearlayout.layoutparams.fill_parent);
  listview listview ;
  private int lastitem = 0;
  linearlayout loadinglayout;
  private listviewadapter adapter;
  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.main);
    listview = (listview) findviewbyid(r.id.mylist);
    log.i("test", "oncreate(bundle savedinstancestate)>>>>>>>>>>>>>>>");
    // 线性布局
    linearlayout layout = new linearlayout(this);
    // 设置布局 水平方向
    layout.setorientation(linearlayout.horizontal);
    // 进度条
    progressbar progressbar = new progressbar(this);
    // 进度条显示位置
    progressbar.setpadding(0, 0, 15, 0);
    // 把进度条加入到layout中
    layout.addview(progressbar, mlayoutparams);
    // 文本内容
    textview textview = new textview(this);
    textview.settext("加载中...");
    textview.setgravity(gravity.center_vertical);
    // 把文本加入到layout中
    layout.addview(textview, fflayoutparams);
    // 设置layout的重力方向，即对齐方式是
    layout.setgravity(gravity.center);
    // 设置listview的页脚layout
    loadinglayout = new linearlayout(this);
    loadinglayout.addview(layout, mlayoutparams);
    loadinglayout.setgravity(gravity.center);
    listview.addfooterview(loadinglayout);
    adapter = new listviewadapter();
    listview.setadapter(adapter);
    listview.setonscrolllistener(new onscrolllistener() {
      @override
      public void onscroll(abslistview view, int firstvisibleitem,
          int visibleitemcount, int totalitemcount) {
        // todo auto-generated method stub
        log.i("test" , "scroll>>>first: " + firstvisibleitem + ", visible: " + visibleitemcount + ", total: " + totalitemcount);
        lastitem = firstvisibleitem + visibleitemcount - 1;
        log.i("test" , "scroll>>>lastitem:" + lastitem);
        //显示50条listitem，即0-49，因为onscroll是在“滑动”执行过之后才触发，所以用adapter.count<=41作条件
        int scrolllength=101;
        if (adapter.count<=scrolllength) {
          if (firstvisibleitem+visibleitemcount==totalitemcount) {
            adapter.count += 10;
            adapter.notifydatasetchanged();
            listview.setselection(lastitem);
            int currentpage=adapter.count/10;
            toast.maketext(getapplicationcontext(), "第"+currentpage+"页", toast.length_long).show();
          }
        }
        else {
           listview.removefooterview(loadinglayout);
        }
      }
      @override
      public void onscrollstatechanged(abslistview view, int scrollstate) {
        // todo auto-generated method stub
      }
    });
  }
  class listviewadapter extends baseadapter {
    int count = 10; /* starting amount */
    public int getcount() {
      return count;
    }
    public object getitem(int pos) {
      return pos;
    }
    public long getitemid(int pos) {
      return pos;
    }
    public view getview(int pos, view v, viewgroup p) {
      log.i("test", "getview>>>pos:" + pos);
      textview view;
      if (v == null) {
        view = new textview(listviewscroll.this);
      } else {
        view = (textview) v;
      }
      view.settext("listitem " + pos);
      view.settextsize(20f);
      view.setgravity(gravity.center);
      view.setheight(60);
      return view;
    }
  }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<listview android:cachecolorhint="#00000000" android:id="@+id/mylist"
android:layout_width="fill_parent" android:layout_height="fill_parent"
    >
  </listview>
</linearlayout>

更多关于android相关内容感兴趣的读者可查看本站专题：《android视图view技巧总结》、《android布局layout技巧总结》、《android图形与图像处理技巧总结》、《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android多媒体操作技巧汇总(音频,视频,录音等)》、《android基本组件用法总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。