Android实现listView的单选功能

最近用到了listView列表的单选功能,网上查了好多多数是用readioButton来实现，但是水平太次居然没看懂。我找啊找 最后终于找到一个个人感觉挺简单的

首先是布局  很简单 就是一个listView 但是里面要有choiceMode这句话 ，表示此listView只能单选

<ListView
    android:id="@+id/select_dispatch_unit_lv"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:choiceMode="singleChoice">ListView>

下面是listView的Adapter

public class SelectDispatchUnitAdapter extends BaseAdapter {
   private Context                 context;
   private List datas;
   private Handler                 handler;
   private int checked = -1;//初始选择为-1，position没有-1嘛，那就是谁都不选咯

   public SelectDispatchUnitAdapter(Context context, List datas, Handler handler) {
      this.context = context;
      this.datas = datas;
      this.handler = handler;
   }

   public void setChecked(int checked) {//设定一个选中的标志位，在activity中传入值。
      this.checked = checked;
   }

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

   @Override
   public Object getItem(int position) {
      return datas.get(position);
   }

   @Override
   public long getItemId(int position) {
      return position;
   }

   @Override
   public View getView(final int position, View convertView, ViewGroup parentView) {
      final ViewHolder holder;
      if (convertView == null) {
         convertView = LayoutInflater.from(context).inflate(R.layout.layout_select_dispatch_unit_list_item, null);
         holder = new ViewHolder();
         holder.selectDispatchUnitCheck = (ImageView) convertView.findViewById(R.id.select_dispatch_unit_check);
         holder.selectDispatchUnitNum = (TextView) convertView.findViewById(R.id.select_dispatch_unit_num);
         holder.selectDispatchUnitName = (TextView) convertView.findViewById(R.id.select_dispatch_unit_name);
         holder.selectDispatchUnitLayout = convertView.findViewById(R.id.select_dispatch_unit_layout);
         convertView.setTag(holder);
      } else {
         holder = (ViewHolder) convertView.getTag();
      }
      holder.selectDispatchUnitNum.setText(String.valueOf(position + 1));
      holder.selectDispatchUnitName.setText(datas.get(position).getUnitName());
      if (checked == position) {//如果点击的项目正好是position这一项

	/*将前面的小圆设置为选中状的图标*/
         holder.selectDispatchUnitCheck.setImageResource(R.mipmap.list_ic_danxuankuang_xuanzhong);
      } else {

	/*将前面的小圆设置为未选中状的图标*/

holder. selectDispatchUnitCheck.setImageResource(R.mipmap. list_ic_danxuankuang_moren); } return convertView; } class ViewHolder { ImageView selectDispatchUnitCheck; TextView selectDispatchUnitNum; TextView selectDispatchUnitName; View selectDispatchUnitLayout; }}

上面adapter里的setCheck()方法有什么用呢？别着急 下面在activity就可以用到

selectDispatchUnitLv = (ListView) findViewById(R.id.select_dispatch_unit_lv);

/*我这里传handler有用 你们可以忽略*/
final SelectDispatchUnitAdapter adapter = new SelectDispatchUnitAdapter(this, datas, mHandler);
selectDispatchUnitLv.setAdapter(adapter);
selectDispatchUnitLv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView parent, View view, int position, long id) {
      adapter.setChecked(position);//传入现在选择的position 现在用到了
      adapter.notifyDataSetInvalidated();//重绘
   }
});

效果图

子布局

<LinearLayout
    android:id="@+id/select_dispatch_unit_layout"
    android:layout_width="match_parent"
    android:layout_height="35dp"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:padding="5dp">


    <ImageView
        android:id="@+id/select_dispatch_unit_check"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="10dp"
        android:button="@null"
        android:src="@mipmap/list_ic_danxuankuang_moren"
        />

    <TextView
        android:id="@+id/select_dispatch_unit_num"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="10dp"
        android:gravity="center_vertical"
        android:text="1"
        android:textColor="@color/bg_btn_blue_color"
        android:textSize="16sp"
        />

    <TextView
        android:id="@+id/select_dispatch_unit_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="10dp"
        android:gravity="center_vertical"
        android:singleLine="true"
        android:text="单位名字"
        android:textColor="@color/bg_btn_blue_color"
        android:textSize="16sp"/>

LinearLayout>