Android中的ListView及其优化（待续）

Adapter代码

public class SpotsAdapter extends BaseAdapter{    private List<SpotsModel> mList;    private LayoutInflater inflater;     public SpotsAdapter(Context context,List<SpotsModel> list){         this.mList = list;        inflater = LayoutInflater.from(context);//传入context对象对其进行初始化    }    @Override    public int getCount() {        return mList.size();    }    @Override    public Object getItem(int position) {        return mList.get(position);    }    @Override    public long getItemId(int id) {        return id;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder holder;         if (convertView == null){            convertView = inflater.inflate(R.layout.spotslist_item, null);            holder = new ViewHolder();  //暂时存储ViewHolder中预定义的属性，类似于一个结构体            //下面几行将layout中的控件定义到这几个属性上            holder.img = (ImageView) convertView.findViewById(R.id.iv_img);            holder.name = (TextView) convertView.findViewById(R.id.txt_spotname);            holder.addr = (TextView) convertView.findViewById(R.id.txt_spotaddress);             convertView.setTag(holder);  //将holder储存的各属性绑定到convertView        }        else{            holder = (ViewHolder) convertView.getTag();        }        //下面几行是对各字段赋值        holder.img.setImageResource(Util.getDrawableResourceID (mList.get(position).getSpotImg()));        holder.name.setText(mList.get(position).getSpotName());        holder.addr.setText(mList.get(position).getSpotAddr());        return convertView;    }    static class ViewHolder{        ImageView img;        TextView name;        TextView addr;    }}

常见的优化手段：

• 重用ConvertView
• ViewHolder
• notifyDatasetChanged()
• 分批分页加载重用ConvertView