优化SimpleAdapter适配器加载效率的方法
在主Activity中：
listview=(ListView)findViewById(R.id.listview);getData();
//为list添加数据overrideSimpleAdapter=newOverrideSimpleAdapter(getContext(),list,R.layout.list_item_layout,
newString[]{"num","word","translates"},
newint[]{R.id.tv_num,R.id.tv_word,R.id.tv_translates});
listview.setAdapter(overrideSimpleAdapter);
重写SimpleAdapter:/**
*CreatedbyKewenCon2017/1/26.
*/
publicclassOverrideSimpleAdapterextendsSimpleAdapter{
/**
*Constructor
*
*@paramcontextThecontextwheretheViewassociatedwiththisSimpleAdapterisrunning
*@paramdataAListofMaps.EachentryintheListcorrespondstoonerowinthelist.The
*Mapscontainthedataforeachrow,andshouldincludealltheentriesspecifiedin
*"from"
*@paramresourceResourceidentifierofaviewlayoutthatdefinestheviewsforthislist
*item.Thelayoutfileshouldincludeatleastthosenamedviewsdefinedin"to"
*@paramfromAlistofcolumnnamesthatwillbeaddedtotheMapassociatedwitheach
*item.
*@paramtoTheviewsthatshoulddisplaycolumninthe"from"parameter.Theseshouldallbe
*TextViews.ThefirstNviewsinthislistaregiventhevaluesofthefirstNcolumns
*/
privateLayoutInflatermInflater;
privateArrayList>list;
privateintmResource;
privateint[]mTo;
privateString[]mFrom;
publicOverrideSimpleAdapter(Contextcontext,ArrayList>data,intresource,String[]from,int[]to){
super(context,data,resource,from,to);
this.list=data;
this.mInflater=LayoutInflater.from(context);
this.mResource=resource;
this.mFrom=from;
this.mTo=to;
}
@Override
publicintgetCount(){
returnlist.size();
}
@Override
publicObjectgetItem(intposition){
returnlist.get(position);
}
@Override
publiclonggetItemId(intposition){
returnposition;
}
@Override
publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
ViewHolderholder=null;
//判断是否缓存
if(convertView==null){
holder=newViewHolder();
//通过LayoutInflater实例化布局
convertView=mInflater.inflate(mResource,null);
//holder.img=(ImageView)convertView.findViewById(R.id.imageView);
holder.num=(TextView)convertView.findViewById(mTo[0]);
holder.word=(TextView)convertView.findViewById(mTo[1]);
holder.translates=(TextView)convertView.findViewById(mTo[2]);
convertView.setTag(holder);
}else{
//通过tag找到缓存的布局
holder=(ViewHolder)convertView.getTag();
}
//设置布局中控件要显示的视图
//holder.img.setBackgroundResource(R.drawable.ic_launcher);
holder.num.setText(list.get(position).get(mFrom[0]).toString());//mFrom[0]为“num”Key
holder.word.setText(list.get(position).get(mFrom[1]).toString());
holder.translates.setText(list.get(position).get(mFrom[2]).toString());
returnconvertView;
}
publicfinalclassViewHolder{
//publicImageViewimg;
publicTextViewnum;
publicTextViewword;
publicTextViewtranslates;
}
}
以上这篇优化SimpleAdapter适配器加载效率的方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持毛票票。