优化SimpleAdapter适配器加载效率的方法

2024-02-25 12:34:04 448

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; } }

优化SimpleAdapter适配器加载效率的方法

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