android 中listview滑动加载的简单demo

在使用listview时，滑动加载可以提高效率，增加用户体验。

主要用到一个OnScrollListener

/**
*Theviewisnotscrolling.Notenavigatingthelistusingthetrackballcountsas
*beingintheidlestatesincethesetransitionsarenotanimated.
*/
publicstaticintSCROLL_STATE_IDLE=0;

/**
*Theuserisscrollingusingtouch,andtheirfingerisstillonthescreen
*/
publicstaticintSCROLL_STATE_TOUCH_SCROLL=1;

/**
*Theuserhadpreviouslybeenscrollingusingtouchandhadperformedafling.The
*animationisnowcoastingtoastop
*/
publicstaticintSCROLL_STATE_FLING=2;

/**
*Callbackmethodtobeinvokedwhilethelistvieworgridviewisbeingscrolled.Ifthe
*viewisbeingscrolled,thismethodwillbecalledbeforethenextframeofthescrollis
*rendered.Inparticular,itwillbecalledbeforeanycallsto
*{@linkAdapter#getView(int,View,ViewGroup)}.
*
*@paramviewTheviewwhosescrollstateisbeingreported
*
*@paramscrollStateThecurrentscrollstate.Oneof{@link#SCROLL_STATE_IDLE},
*{@link#SCROLL_STATE_TOUCH_SCROLL}or{@link#SCROLL_STATE_IDLE}.
*/
publicvoidonScrollStateChanged(AbsListViewview,intscrollState);

/**
*Callbackmethodtobeinvokedwhenthelistorgridhasbeenscrolled.Thiswillbe
*calledafterthescrollhascompleted
*@paramviewTheviewwhosescrollstateisbeingreported
*@paramfirstVisibleItemtheindexofthefirstvisiblecell(ignoreif
*visibleItemCount==0)
*@paramvisibleItemCountthenumberofvisiblecells
*@paramtotalItemCountthenumberofitemsinthelistadaptor
*/
publicvoidonScroll(AbsListViewview,intfirstVisibleItem,intvisibleItemCount,
inttotalItemCount);

packagecom.nico.listviewload;

importjava.util.ArrayList;
importjava.util.List;

importcom.nico.bean.MsgInfo;

importandroid.app.Activity;
importandroid.os.AsyncTask;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.util.Log;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.widget.AbsListView;
importandroid.widget.BaseAdapter;
importandroid.widget.LinearLayout;
importandroid.widget.ListView;
importandroid.widget.TextView;
importandroid.widget.AbsListView.OnScrollListener;

publicclassMainActivityextendsActivity{

List<MsgInfo>infoList=null;
privateLayoutInflaterinflater=null;
privateListViewlistview=null;
privatemyAdapteradapter=null;
privateLinearLayoutftview=null;

privateHandlerhandler=newHandler(){

@Override
publicvoidhandleMessage(Messagemsg){
super.handleMessage(msg);
switch(msg.what){

case1:
adapter.notifyDataSetChanged();
try{
Thread.sleep(2000l);
}catch(InterruptedExceptione){
e.printStackTrace();
}
setAdapter();
break;
}
}
};

/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
inflater=this.getLayoutInflater();

listview=(ListView)findViewById(R.id.listview);
ftview=(LinearLayout)inflater.inflate(R.layout.ftview,null);

listview.addFooterView(ftview,null,false);
listview.setAdapter(newmyAdapter());
adapter=newmyAdapter();

ftview.setVisibility(View.VISIBLE);
listview.setOnScrollListener(newOnScrollListener(){

@Override
publicvoidonScrollStateChanged(AbsListViewview,intscrollState){

if(scrollState==SCROLL_STATE_IDLE
&&view.getLastVisiblePosition()==view.getCount()-1)

{
handler.sendEmptyMessage(1);
}
}

@Override
publicvoidonScroll(AbsListViewview,intfirstVisibleItem,
intvisibleItemCount,inttotalItemCount){

}
});
}

publicList<MsgInfo>getList(){
List<MsgInfo>infoList=newArrayList<MsgInfo>();
for(inti=0;i<7;i++){
MsgInfoinfo=newMsgInfo();
info.id=i;
info.detailinfo="这是第"+i+"条信息";
info.name="第"+i+"项";
info.size=1024*i;
infoList.add(info);
}
returninfoList;
}

publicvoidsetData(){

infoList=getList();
}

publicvoidsetAdapter(){
for(inti=0;i<7;i++){
MsgInfoinfo=newMsgInfo();
info.id=i;
info.detailinfo="这是第"+i+"条信息";
info.name="第"+i+"项";
info.size=1024*i;
infoList.add(info);
}

adapter.notifyDataSetChanged();
}

publicclassmyAdapterextendsBaseAdapter{

@Override
publicvoidnotifyDataSetChanged(){
if(ftview.getVisibility()==View.VISIBLE)
{
ftview.setVisibility(View.GONE);
}
elseif(ftview.getVisibility()==View.GONE)
{
ftview.setVisibility(View.VISIBLE);
}
super.notifyDataSetChanged();
}

TextViewname,detail,size;

publicmyAdapter(){
setData();
}

@Override
publicintgetCount(){
returninfoList.size();
}

@Override
publicObjectgetItem(intposition){
returninfoList.get(position);
}

@Override
publiclonggetItemId(intposition){
returnposition;
}

@Override
publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
if(convertView==null){
convertView=inflater.inflate(R.layout.item,null,false);

}
name=(TextView)convertView.findViewById(R.id.name);
detail=(TextView)convertView.findViewById(R.id.detail);
size=(TextView)convertView.findViewById(R.id.size);
name.setText(infoList.get(position).name);
detail.setText(infoList.get(position).detailinfo);
size.setText(infoList.get(position).size+"");
returnconvertView;
}


}

publicclassLoadAsyTaskextendsAsyncTask<String,String,String>{

@Override
protectedStringdoInBackground(String...params){

for(inti=0;i<7;i++){
MsgInfoinfo=newMsgInfo();
info.id=i;
info.detailinfo="这是第"+i+"条信息";
info.name="第"+i+"项";
info.size=1024*i;
infoList.add(info);
}
returnnull;
}

@Override
protectedvoidonPostExecute(Stringresult){
super.onPostExecute(result);

ftview.setVisibility(View.GONE);
adapter.notifyDataSetChanged();
}

}
}

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"android:layout_height="match_parent">
<LinearLayoutandroid:layout_width="fill_parent"android:gravity="center_horizontal"
android:layout_height="wrap_content"android:layout_gravity="center_horizontal">
<ImageViewandroid:layout_width="50dip"
android:layout_height="50dip"
android:src="@drawable/progressbar"android:id="@+id/pbdrawable"/>
<TextViewandroid:layout_width="wrap_content"
android:layout_height="wrap_content"android:text="请稍后..."android:id="@+id/pbtxt"/>
</LinearLayout>
</LinearLayout>

Java代码

<?xmlversion="1.0"encoding="utf-8"?>


<rotatexmlns:android="http://schemas.android.com/apk/res/android"
android:pivotX="50%"android:pivotY="50%"android:fromDegrees="0"
android:toDegrees="360">


<shapeandroid:shape="ring"android:innerRadiusRatio="3"
android:thicknessRatio="8"android:useLevel="false">


<gradientandroid:type="sweep"android:useLevel="false"
android:startColor="#000000"android:centerColor="#FFFFFF"
android:centerY="0.50"android:endColor="#000000"/>

</shape>

</rotate>