listview和imageview实现条目单选效果

前段时间在项目开发中，有listview实现单选和多选的效果，特别是listview的单选效果，一开始项目比较紧，自己考虑的是用listview和radionbutton实现的，可能是自己考虑不周到的原因，效果是实现了，但是用户体验不怎么好，做完项目后，自己又弄了下，使用listview和imageview实现，点击listview条目的时候就可以实现单选效果，这样用户体验就稍微好些。以下就是实现的方式：
activity_main.xml文件:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.listtest.MainActivity$PlaceholderFragment" >

    <ListView
 android:id="@+id/listview"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent" />

RelativeLayout>

listview_item.xml文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.listtest.MainActivity$PlaceholderFragment" >

    <RelativeLayout 
 android:layout_width="fill_parent"
 android:layout_height="50dp">
        <TextView
 android:id="@+id/tv" 
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:textSize="15sp"
 android:textColor="#000000"
 android:text="123112"
 android:layout_centerVertical="true"
 android:layout_marginLeft="15dp"/>
        <ImageView
 android:id="@+id/iv" 
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:src="@drawable/sex_nor"
 android:layout_alignParentRight="true"
 android:layout_centerVertical="true"
 android:layout_marginRight="15dp"/>
    RelativeLayout>

RelativeLayout>

MainActivity文件:

public class MainActivity extends ActionBarActivity implements OnItemClickListener {
    private ListAdapter adapter;
    private ListView listview;
    private List list=new ArrayList();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        initView();

    }

    private void initView() {
        listview = (ListView) findViewById(R.id.listview);
        addData();
        adapter=new ListAdapter(MainActivity.this);
        listview.setAdapter(adapter);
        listview.setOnItemClickListener(this);

    }
    private void addData() {
        for (int i = 0; i <20; i++) {
            list.add("深圳"+i);
        }
    }
    class ListAdapter extends BaseAdapter{
        private int selectedPosition = -1;// 选中的位置
        private Context context;        
        public ListAdapter(Context context) {
            this.cOntext= context;
        }

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int position) {
            return list.get(position);
        }
        public void setSelectedPosition(int position) {
            selectedPosition = position;
        }
        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if (cOnvertView==null) {
                holder=new ViewHolder();
                cOnvertView=LayoutInflater.from(context).inflate(R.layout.listview_item, null);
                holder.tv=(TextView) convertView.findViewById(R.id.tv);
                holder.iv=(ImageView) convertView.findViewById(R.id.iv);

                convertView.setTag(holder);
            }else{
                holder=(ViewHolder) convertView.getTag();
            }
            String string = list.get(position);
            holder.tv.setText(string);
            if(position%2==0){
                if (selectedPosition==position) {
                    convertView.setSelected(true);
                    convertView.setPressed(true);
// convertView.setBackgroundColor(Color.parseColor("#0097e0"));
                    holder.iv.setImageResource(R.drawable.sex_down);
                }else{
                    convertView.setSelected(false);
                    convertView.setPressed(false);
// convertView.setBackgroundColor(Color.parseColor("#e4ebf1"));
                    holder.iv.setImageResource(R.drawable.sex_nor);
                }   
            }else{
                if (selectedPosition==position) {
                    convertView.setSelected(true);
                    convertView.setPressed(true);
                    holder.iv.setImageResource(R.drawable.sex_down);
// convertView.setBackgroundColor(Color.parseColor("#0097e0"));
                }else{
                    convertView.setSelected(false);
                    convertView.setPressed(false);
// convertView.setBackgroundColor(Color.parseColor("#ced7de"));
                    holder.iv.setImageResource(R.drawable.sex_nor);
                }
            }
            return convertView;
        }
        class ViewHolder{
            TextView tv;
            ImageView iv;
        }
    }
    @Override
    public void onItemClick(AdapterView parent, View view, int position, long id) {
        adapter.setSelectedPosition(position);
        adapter.notifyDataSetInvalidated();
    }
}

以上就是全部代码了。效果如下