效果图
<1>
当前listview里的原始数据
<2>
当滑动到最低端时候，开始加载新数据，出现loading
<3>
新数据加载后显示
具体实现
写一个适配器，一般会自己继承，然后重新一些东西
public
class
MyAdapter
extends
ArrayAdapter<bean>{
private
final
LayoutInflater
mInflater
;
public
MyAdapter(Context context, List<bean> apps) {
super
(context, 0, apps);
mInflater
= LayoutInflater.
from
(context);
}
@Override
public
View getView(
int
position, View convertView, ViewGroup parent) {
bean bean =
this
.getItem(position);
if
(convertView ==
null
) {
convertView =
mInflater
.inflate(R.layout.
item
, parent,
false
);
}
TextView data = (TextView) convertView.findViewById(R.id.
text
);
data.setText(bean.getName());
return
convertView;
}
}
activity加载数据，新数据一般是当你第一次默认显示的数据已经完全显示，然后滚轮拖动到屏幕下端时候加载，也就是
firstVisibleItem + visibleItemCount = totalItemCount的时候，此时才启动线程开始加载数据。
public
class
LoadActivity
extends
Activity {
private
ListView
lv
=
null
;
ArrayList<bean>
beans
=
new
ArrayList<bean>();
MyAdapter
adapter
=
null
;
boolean
isRefresh
=
true
;
boolean
isFirstRun
=
true
;
private
bean
bean
=
null
;
@
Override
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.
refresh
);
lv
= (ListView) findViewById(R.id.
listview
);
lv
.setOnScrollListener(
new
OnScrollListener() {
public
void
onScroll(AbsListView view,
int
firstVisibleItem,
int
visibleItemCount,
int
totalItemCount) {
Log.
i
(
"v"
,
""
+ visibleItemCount);
Log.
i
(
"f"
,
""
+ firstVisibleItem);
Log.
i
(
"t"
,
""
+ totalItemCount);
//第一次进入时候,如果当前显示页面放不下第一次的所有数据，会分页显示
//就算滚轮到最低端,也不会加载的新的数据，只有当第一次数据显示完后才会刷新出现loading
//如果没有下面的判断，在你进入这个listview就会直接加载一次新数据，在这个例子里，比如你第一次加载的事40条数据，会变成45条
if
(
isFirstRun
) {
isFirstRun
=
false
;
return
;
}
if
((firstVisibleItem + visibleItemCount) == totalItemCount
&&
isRefresh
) {
isRefresh
=
false
;
//loading条显示出来
findViewById(R.id.
loadtext
).setVisibility(View.
VISIBLE
);
new
LoadThread().start();
}
}
public
void
onScrollStateChanged(AbsListView view,
int
scrollState) {
});
adapter
=
new
MyAdapter(
this
.getBaseContext(), getFirstBean());
lv
.setAdapter(
adapter
);
}
//第一次加载的数据
private
ArrayList<bean> getFirstBean(){
bean
=
new
bean();
for
(
int
i = 0; i < 20; i++) {
bean
=
new
bean();
bean
.setName(
"Json "
+ i +
" 号"
);
beans
.add(
bean
);
}
return
beans
;
}
//需要加载的新数据
private
void
refreshListView() {
if
(
beans
==
null
||
adapter
==
null
) {
return
;
}
bean bean =
null
;
for
(
int
i = 0; i < 5; i++) {
bean =
new
bean();
bean.setName(
"新数据： "
+ i);
beans
.add(bean);
}
}
Handler
_handler
=
new
Handler() {
@
Override
public
void
handleMessage(Message msg) {
switch
(msg.
what
) {
case
1:
adapter
.notifyDataSetChanged();
//当数据已经改变后loading条不显示出来
findViewById(R.id.
loadtext
).setVisibility(View.
INVISIBLE
);
isRefresh
=
true
;
break
;
case
2:
}
}
};
@
Override
public
void
run() {
try
{
sleep
(1000);
}
catch
(InterruptedException e) {
e.printStackTrace();
}
//传给handler处理
_handler
.sendEmptyMessage(1);
}
}
}
