android ListView之BaseAdapter的使用方式

通常在使用自定义适配器的时候,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);}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn list == null ?0:list.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic 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;}}
最近,做百度地图离线下载的时候,发现一种新的方式,很想知道百度的android程序员是如何来写代码的。仔细一看,确实有很大不同。

来自百度地图离线下载的Demo

private ArrayList localMapList = null;public class LocalMapAdapter extends BaseAdapter {@Overridepublic int getCount() {return localMapList.size();}@Overridepublic Object getItem(int index) {return localMapList.get(index);}@Overridepublic long getItemId(int index) {return index;}@Overridepublic 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() {@Overridepublic void onClick(View arg0) {mOffline.remove(e.cityID);updateView();}});display.setOnClickListener(new OnClickListener() {@Overridepublic 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);}});}}