How to Use BaseAdapter of android ListView

How to Use BaseAdapter of android ListView

We usually master a fixed pattern when using a custom adapter. Make full use of convertView + cache.

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;}}
  
 

Recently, when downloading Baidu maps offline, I found a new method and wanted to know how Baidu android programmers wrote code. A closer look is indeed quite different.

Demo of offline download from Baidu Map

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. in Flate (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 ("updatable");} else {update. setText ("latest");} 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. longpolling); intent. putExtra ("y", e. geoPt. latitude); intent. setClass (OfflineDemo. this, BaseMapDemo. class); startActivity (intent );}});}}