0571交友网,异界龙尊,黛瑞玫尔
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
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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。
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