通常在使用自己定义适配器的时候，我们都会掌握一种固定的模式。充分利用convertView+缓存的方式。

private ArrayList
     
       list ;	private LayoutInflater mInflater;	public DetailListAdapter(Context context,ArrayList
      
        list){		this.list=list;		mInflater = LayoutInflater.from(context);	}	@Override	public int getCount() {		// TODO Auto-generated method stub		return list == null ?0:list.size();	}	@Override	public Object getItem(int position) {		// TODO Auto-generated method stub		return position;	}	@Override	public long getItemId(int position) {		return position;	}	@Override	public View getView(int position, View convertView, ViewGroup parent) {		ViewHolder holder = null;		if(convertView == null){			convertView = mInflater.inflate(R.layout.search_info_item_layout, null);			holder = new ViewHolder();			holder.TimeTxt = (TextView) convertView.findViewById(R.id.time_tv);			holder.AddressTxt = (TextView) convertView.findViewById(R.id._address_tv);			holder.processFlagTxt = (TextView) convertView.findViewById(R.id.process_flag_tv);			convertView.setTag(holder);		}else{			holder = (ViewHolder) convertView.getTag();		}		holder.TimeTxt.setText(list.get(position).getTime());		holder.AddressTxt.setText(list.get(position).getAddress());		holder.processFlagTxt.setText(list.get(position).getState());		return convertView;	}	class ViewHolder{		TextView TimeTxt;		TextView AddressTxt;		TextView processFlagTxt;	}}
      
     

近期，做百度地图离线下载的时候，发现一种新的方式，非常想知道百度的android程序猿是怎样来写代码的。细致一看，确实有非常大不同。

来自百度地图离线下载的Demo

private ArrayList
     
       localMapList = null;	public class LocalMapAdapter extends BaseAdapter {		@Override		public int getCount() {			return localMapList.size();		}		@Override		public Object getItem(int index) {			return localMapList.get(index);		}		@Override		public long getItemId(int index) {			return index;		}		@Override		public View getView(int index, View view, ViewGroup arg2) {			MKOLUpdateElement e = (MKOLUpdateElement) getItem(index);			view = View.inflate(OfflineDemo.this,					R.layout.offline_localmap_list, null);			initViewItem(view, e);			return view;		}		void initViewItem(View view, final MKOLUpdateElement e) {			Button display = (Button) view.findViewById(R.id.display);			Button remove = (Button) view.findViewById(R.id.remove);			TextView title = (TextView) view.findViewById(R.id.title);			TextView update = (TextView) view.findViewById(R.id.update);			TextView ratio = (TextView) view.findViewById(R.id.ratio);			ratio.setText(e.ratio + "%");			title.setText(e.cityName);			if (e.update) {				update.setText("可更新");			} else {				update.setText("最新");			}			if (e.ratio != 100) {				display.setEnabled(false);			} else {				display.setEnabled(true);			}			remove.setOnClickListener(new OnClickListener() {				@Override				public void onClick(View arg0) {					mOffline.remove(e.cityID);					updateView();				}			});			display.setOnClickListener(new OnClickListener() {				@Override				public void onClick(View v) {					Intent intent = new Intent();					intent.putExtra("x", e.geoPt.longitude);					intent.putExtra("y", e.geoPt.latitude);					intent.setClass(OfflineDemo.this, BaseMapDemo.class);					startActivity(intent);				}			});		}	}