main6.xml
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<LinearLayout xmlns:android=
"http://schemas.android.com/apk/res/android"
android:layout_width=
"match_parent"
android:layout_height=
"match_parent"
android:orientation=
"vertical"
>
<ListView
android:id=
"@+id/listView6_1_1"
android:layout_width=
"match_parent"
android:layout_height=
"fill_parent"
></ListView>
</LinearLayout>
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main6_item.xml
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<LinearLayout xmlns:android=
"http://schemas.android.com/apk/res/android"
android:layout_width=
"match_parent"
android:layout_height=
"wrap_content"
android:orientation=
"vertical"
>
<TextView
android:id=
"@+id/textView_title_1_1"
android:layout_width=
"match_parent"
android:layout_height=
"wrap_content"
android:textSize=
"28sp"
android:text=
"title"
android:textColor=
"#55ff88"
/>
<TextView
android:id=
"@+id/textView_content_2_2"
android:layout_width=
"match_parent"
android:layout_height=
"wrap_content"
android:textSize=
"20sp"
android:text=
"duanluosdfsdf"
/>
</LinearLayout>
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MainActivity6
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package
com.example.listview;
import
java.util.ArrayList;
import
java.util.List;
import
java.util.Vector;
import
android.app.Activity;
import
android.os.Bundle;
import
android.os.Handler;
import
android.os.Message;
import
android.view.View;
import
android.view.ViewGroup;
import
android.widget.AbsListView;
import
android.widget.AbsListView.OnScrollListener;
import
android.widget.BaseAdapter;
import
android.widget.ListView;
import
android.widget.TextView;
public
class
MainActivity6
extends
Activity
implements
OnScrollListener{
private
ListView listView;
private
List<News> news=
new
Vector<News>();
private
MyAdapter myDapter;
//线程之间通信的桥梁
private
Handler handler=
new
Handler(){
@Override
public
void
handleMessage(Message msg) {
// TODO Auto-generated method stub
switch
(msg.what) {
case
1
:
//通知适配器，更新数据
myDapter.notifyDataSetChanged();
break
;
default
:
break
;
}
}
};
@Override
protected
void
onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super
.onCreate(savedInstanceState);
setContentView(R.layout.main6);
listView=(ListView) findViewById(R.id.listView6_1_1);
//设置底部视图
View footView=getLayoutInflater().inflate(R.layout.load,
null
);
listView.addFooterView(footView);
listView.setOnScrollListener(
this
);
//initDate();
new
LoadDateThread().start();
//加载数据的线程
myDapter=
new
MyAdapter();
listView.setAdapter(myDapter);
}
/**
* 初始化数据
* */
int
index;
//计数器
void
initDate(){
for
(
int
i=
0
;i<
10
;i++){
News newss=
new
News();
newss.title=
"title-"
+index;
newss.content=
"content-"
+index;
index++;
news.add(newss);
}
}
/**
* 自定义适配器
* */
class
MyAdapter
extends
BaseAdapter{
@Override
public
int
getCount() {
// TODO Auto-generated method stub
return
news.size();
}
@Override
public
Object getItem(
int
position) {
// TODO Auto-generated method stub
return
news.get(position);
}
@Override
public
long
getItemId(
int
position) {
// TODO Auto-generated method stub
return
position;
}
@Override
public
View getView(
int
position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Viewholer viewholer;
if
(convertView==
null
){
convertView=getLayoutInflater().inflate(R.layout.main6_item,
null
);
viewholer=
new
Viewholer();
viewholer.textView=(TextView) convertView.findViewById(R.id.textView_title_1_1);
viewholer.textContent=(TextView) convertView.findViewById(R.id.textView_content_2_2);
convertView.setTag(viewholer);
}
else
{
viewholer=(Viewholer) convertView.getTag();
}
//从veclor中取出数据并填充
News newss=news.get(position);
viewholer.textView.setText(newss.title);
viewholer.textContent.setText(newss.content);
return
convertView;
}
}
static
class
Viewholer{
TextView textView;
TextView textContent;
}
// int scrollState=0;
int
visiableLastIndex=
0
;
//滚动条状态发生变化事件方法
@Override
public
void
onScrollStateChanged(AbsListView view,
int
scrollState) {
// TODO Auto-generated method stub
/* this.scrollState=scrollState;
System.out.println("scrollState:"+scrollState);*/
//滚动条在最下面并且滚动条是停止状态
if
(myDapter.getCount()==visiableLastIndex&&scrollState==OnScrollListener.SCROLL_STATE_IDLE){
//启动线程加载数据
new
LoadDateThread().start();
}
}
//滚动事件方法
@Override
public
void
onScroll(AbsListView view,
int
firstVisibleItem,
int
visibleItemCount,
int
totalItemCount) {
// TODO Auto-generated method stub
System.out.println(
"view:"
+view);
System.out.println(
"firstVisibleItem:"
+firstVisibleItem);
System.out.println(
"visibleItemCount:"
+visibleItemCount);
System.out.println(
"totalItemCount"
+totalItemCount);
visiableLastIndex=firstVisibleItem+visibleItemCount-
1
;
}
//模拟加载数据
//子线程不允许访问主线程的UI组件(保证主线程UI组件安全)
class
LoadDateThread
extends
Thread{
@Override
public
void
run() {
// TODO Auto-generated method stub
super
.run();
initDate();
try
{
Thread.sleep(
2000
);
//通知主线程,数据已加载完毕
handler.sendEmptyMessage(
1
);
}
catch
(InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
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News
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package
com.example.listview;
/**
* 新闻对象
* */
public
class
News {
String title;
String content;
}
|
本文转自 matengbing 51CTO博客，原文链接:http://blog.51cto.com/matengbing/1882577
