Android ListView数据的分批显示功能

2024-02-25 15:22:04 44
AndroidListView数据的分批显示
布局文件activity_call_safe2.xml
CasllSafeActivity.java
packagecom.ldw.safe.Activity;
importjava.util.List;
importandroid.app.Activity;
importandroid.content.Context;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.view.ViewGroup;
importandroid.widget.AbsListView;
importandroid.widget.AbsListView.OnScrollListener;
importandroid.widget.EditText;
importandroid.widget.ImageView;
importandroid.widget.LinearLayout;
importandroid.widget.ListView;
importandroid.widget.TextView;
importandroid.widget.Toast;
importcom.ldw.safe.R;
importcom.ldw.safe.adapter.MyBaseAdapter;
importcom.ldw.safe.bean.BlackNumberInfo;
importcom.ldw.safe.db.dao.BlackNumberDao;
publicclassCallSafeActivityextendsActivity{
privateListViewlist_view_callsafe;
privateListblackNumberInfos;
privateLinearLayoutll_pb;
privateBlackNumberDaodao;
privateCallSafeAdapteradapter;
privateinttotalNumber;//总的条数
privateintmStartIndex=0;//开始加载的位置
privateintmaxCount=20;//每页加载多少数据
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_call_safe2);
initUi();
initData();
}
//初始化数据
privateHandlerhandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
//数据初始化结束，关闭家在全的展示
ll_pb.setVisibility(View.INVISIBLE);
//防止适配器一直刷新
if(adapter==null){
adapter=newCallSafeAdapter(blackNumberInfos,CallSafeActivity.this);
//配置适配器
list_view_callsafe.setAdapter(adapter);
}else{
adapter.notifyDataSetChanged();
}
}
};
privateEditTextet_page_number;
//初始化数据
privatevoidinitData(){
//防止阻塞主线程，在子线程中初始化数据（后期数据会很多）
newThread(){
@Override
publicvoidrun(){
dao=newBlackNumberDao(CallSafeActivity.this);
//一共有多少条数据
totalNumber=dao.getTotalNumber();
//分批加载数据
if(blackNumberInfos==null){
//第一次加载
blackNumberInfos=dao.findPar2(mStartIndex,maxCount);
}else{
//把后面的数据。追加到blackNumberInfos集合里面。防止黑名单被覆盖
blackNumberInfos.addAll(dao.findPar2(mStartIndex,maxCount));
}
handler.sendEmptyMessage(0);
}
}.start();
}
//初始化UI
privatevoidinitUi(){
ll_pb=(LinearLayout)findViewById(R.id.ll_pb);
//初始化的时候展示加载的圆圈
ll_pb.setVisibility(View.VISIBLE);
list_view_callsafe=(ListView)findViewById(R.id.list_view_callsafe);
//设置listView的滚动监听器
list_view_callsafe.setOnScrollListener(newOnScrollListener(){
//状态改变时候回调的方法
/*
*@paramscrollState表示滚动的状态
*AbsListView.OnScrollListener.SCROLL_STATE_IDLE闲置状态
*AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL手指触摸的时候的状态
*AbsListView.OnScrollListener.SCROLL_STATE_FLING惯性
*/
@Override
publicvoidonScrollStateChanged(AbsListViewview,intscrollState){
switch(scrollState){
caseAbsListView.OnScrollListener.SCROLL_STATE_IDLE:
//获取到最后一条显示的数据条数
intlastVisiblePosition=list_view_callsafe.getLastVisiblePosition();
System.out.println("lastVisiblePosition=========="+lastVisiblePosition);
if(lastVisiblePosition==blackNumberInfos.size()-1){//判断最后一个数据是不是每页显示的数据-1
//加载更多的数据。更改加载数据的开始位置
mStartIndex+=maxCount;
if(mStartIndex>=totalNumber){
Toast.makeText(getApplicationContext(),
"没有更多的数据了。",Toast.LENGTH_SHORT).show();
return;
}
initData();
}
break;
}
}
//listview滚动的时候调用的方法
//时时调用。当我们的手指触摸的屏幕的时候就调用
@Override
publicvoidonScroll(AbsListViewview,intfirstVisibleItem,
intvisibleItemCount,inttotalItemCount){
//TODOAuto-generatedmethodstub
}
});
}
//对代码进行优化，继承自定义MyBaseAdapter，MyBaseAdapter继承自BaseAdapter封装一些常用的方法
privateclassCallSafeAdapterextendsMyBaseAdapter{
privateCallSafeAdapter(Listlists,ContextmContext){
super(lists,mContext);
}
@Override
publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
//谷歌推出的优化方案
ViewHolderholder;
if(convertView==null){
convertView=View.inflate(CallSafeActivity.this,R.layout.item_call_safe,null);
holder=newViewHolder();
holder.tv_number=(TextView)convertView.findViewById(R.id.tv_number);
holder.tv_mode=(TextView)convertView.findViewById(R.id.tv_mode);
holder.iv_delete=(ImageView)convertView.findViewById(R.id.iv_delete);
convertView.setTag(holder);
}else{
holder=(ViewHolder)convertView.getTag();
}
holder.tv_number.setText(lists.get(position).getNumber());
Stringmode=lists.get(position).getMode();
if(mode.equals("1")){
holder.tv_mode.setText("电话和短信拦截");
}elseif(mode.equals("2")){
holder.tv_mode.setText("电话拦截");
}elseif(mode.equals("3")){
holder.tv_mode.setText("短信拦截");
}
finalBlackNumberInfoinfo=lists.get(position);
//监听删除数据按钮，删除数据
holder.iv_delete.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
Stringnumber=info.getNumber();
booleanresult=dao.delete(number);
if(result){
Toast.makeText(CallSafeActivity.this,"删除成功",Toast.LENGTH_SHORT).show();
lists.remove(info);
//更新ListView
adapter.notifyDataSetChanged();
}else{
Toast.makeText(CallSafeActivity.this,"删除失败",Toast.LENGTH_SHORT).show();
}
}
});
returnconvertView;
/*
//谷歌推出的优化方案
ViewHolderholder;
if(convertView==null){
convertView=View.inflate(CallSafeActivity.this,R.layout.item_call_safe,null);
holder=newViewHolder();
holder.tv_number=(TextView)convertView.findViewById(R.id.tv_number);
holder.tv_mode=(TextView)convertView.findViewById(R.id.tv_mode);
convertView.setTag(holder);
}else{
holder=(ViewHolder)convertView.getTag();
}
holder.tv_number.setText(blackNumberInfos.get(position).getNumber());
Stringmode=blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
holder.tv_mode.setText("电话和短信拦截");
}elseif(mode.equals("2")){
holder.tv_mode.setText("电话拦截");
}elseif(mode.equals("3")){
holder.tv_mode.setText("短信拦截");
}
returnconvertView;
*/
/*初步的优化
convertView=View.inflate(CallSafeActivity.this,R.layout.item_call_safe,null);
TextViewtv_number=(TextView)convertView.findViewById(R.id.tv_number);
TextViewtv_mode=(TextView)convertView.findViewById(R.id.tv_mode);
tv_number.setText(blackNumberInfos.get(position).getNumber());
Stringmode=blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
tv_mode.setText("电话和短信拦截");
}elseif(mode.equals("2")){
tv_mode.setText("电话拦截");
}elseif(mode.equals("3")){
tv_mode.setText("短信拦截");
}
returnconvertView;
*/
/*传统的方式
Viewview=View.inflate(CallSafeActivity.this,R.layout.item_call_safe,null);
TextViewtv_number=(TextView)view.findViewById(R.id.tv_number);
TextViewtv_mode=(TextView)view.findViewById(R.id.tv_mode);
tv_number.setText(blackNumberInfos.get(position).getNumber());
Stringmode=blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
tv_mode.setText("电话和短信拦截");
}elseif(mode.equals("2")){
tv_mode.setText("电话拦截");
}elseif(mode.equals("3")){
tv_mode.setText("短信拦截");
}
returnview;
*/
}
}
staticclassViewHolder{
TextViewtv_number;
TextViewtv_mode;
ImageViewiv_delete;
}
}
以上所述是小编给大家介绍的AndroidListView数据的分批显示功能，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
Android ListView数据的分批显示功能

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