package com.example.selectitemtest;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.content.Context;import android.graphics.Color;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {    private ListView lv;    private List<Map<String, Object>> data;    private MyAdapter adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lv = (ListView)findViewById(R.id.lv);        //获取将要绑定的数据设置到data中        data = http://www.mamicode.com/getData();"color: #ff0000;">lv.setChoiceMode(AbsListView.CHOICE_MODE_SINGLE);        lv.setOnItemClickListener(new ListView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                    long arg3) {                Toast.makeText(getApplicationContext(), "click position:"+arg2, Toast.LENGTH_SHORT).show();                adapter.setSelectedItem(arg2);                //adapter.notifyDataSetInvalidated();            }        });    }     private List<Map<String, Object>> getData()        {            List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();            Map<String, Object> map;            for(int i=0;i<10;i++)            {                map = new HashMap<String, Object>();                map.put("img", R.drawable.ic_launcher);                map.put("title", "花郎");                map.put("info", "动力源于兴趣...");                list.add(map);            }            return list;        }                //ViewHolder静态类        static class ViewHolder        {            public ImageView img;            public TextView title;            public TextView info;        }                public class MyAdapter extends BaseAdapter        {                private LayoutInflater mInflater = null;            private int selectedItem = -1;            private MyAdapter(Context context)            {                //根据context上下文加载布局，这里的是Demo17Activity本身，即this                this.mInflater = LayoutInflater.from(context);            }            @Override            public int getCount() {                //How many items are in the data set represented by this Adapter.                //在此适配器中所代表的数据集中的条目数                return data.size();            }            @Override            public Object getItem(int position) {                // Get the data item associated with the specified position in the data set.                //获取数据集中与指定索引对应的数据项                return position;            }                        public void setSelectedItem(int selectedItem)            {                this.selectedItem = selectedItem;            }            @Override            public long getItemId(int position) {                //Get the row id associated with the specified position in the list.                //获取在列表中与指定索引对应的行id                return position;            }                        //Get a View that displays the data at the specified position in the data set.            //获取一个在数据集中指定索引的视图来显示数据            @Override            public View getView(int position, View convertView, ViewGroup parent) {                ViewHolder holder = null;                //如果缓存convertView为空，则需要创建View                if(convertView == null)                {                    holder = new ViewHolder();                    //根据自定义的Item布局加载布局                    convertView = mInflater.inflate(R.layout.list_item, null);                    holder.img = (ImageView)convertView.findViewById(R.id.img);                    holder.title = (TextView)convertView.findViewById(R.id.tv);                    holder.info = (TextView)convertView.findViewById(R.id.info);                    //将设置好的布局保存到缓存中，并将其设置在Tag里，以便后面方便取出Tag                    convertView.setTag(holder);                }else                {                    holder = (ViewHolder)convertView.getTag();                }                holder.img.setBackgroundResource((Integer)data.get(position).get("img"));                holder.title.setText((String)data.get(position).get("title"));                holder.info.setText((String)data.get(position).get("info"));                if(position == selectedItem)                {                    //convertView.setBackgroundColor(Color.BLUE);                    //convertView.setSelected(true);                    convertView.setBackgroundResource(R.drawable.all_listentry_left_selected);                }else                {                    //convertView.setBackgroundColor(Color.GRAY);                    //convertView.setSelected(false);                    convertView.setBackgroundResource(R.drawable.lstview);                }                return convertView;            }                    }}