在自定义列表视图中选择多个单选按钮

Question

我正在尝试使用自定义列表视图列出所有已安装的应用程序。每行包含ImageView，TextView和RadioButton。问题是，当我单击任何单选按钮时，会选择多个单选按钮。

我的自定义适配器的代码和listview行的布局如下所示。

我的代码有什么问题？欢迎任何帮助。

ListViewAdapter.java

public class ListViewAdapter extends BaseAdapter {

    // Declare Variables
    private Context context;
    private ArrayList<ListItem> items;
    private LayoutInflater inflater;

    private String TAG = "TAG";

    public ListViewAdapter(Context context, ArrayList<ListItem> items) {
        this.context = context;
        this.items = items;
    }

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

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

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

    @Override  
    public View getView(int position, View convertView, ViewGroup parent) {  

        // Declare Variables
        View v = convertView;
        AppNamesViewHolder viewHolder;
        ListItem item = items.get(position);

        if (convertView == null) 
        {
            Log.d(TAG,"in convertview=null");
            inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = inflater.inflate(R.layout.list_item_layout, null);
            viewHolder = new AppNamesViewHolder(v);
            v.setTag(viewHolder);
        }
        else 
        {
            viewHolder = (AppNamesViewHolder) v.getTag();
        }

        viewHolder.appName.setText(item.getName());
        viewHolder.imgIcon.setImageDrawable(item.getIcon());

        return v;
    }
}  
class AppNamesViewHolder 
{     
    public TextView appName;
    public ImageView imgIcon;
    public RadioButton radioBt;

    public AppNamesViewHolder(View base) 
    {  
        appName = (TextView) base.findViewById(R.id.tvAppName);
        imgIcon = (ImageView) base.findViewById(R.id.ivIcon);
        radioBt = (RadioButton)base.findViewById(R.id.radio);
    }  
}

list_item_layout.xml

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="65dp"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/ivIcon"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:layout_gravity="center"
        android:scaleType="fitXY" />

    <TextView
        android:id="@+id/tvAppName"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginLeft="10dp"
        android:layout_weight="0.85"
        android:text="AppName"
        android:textColor="@color/blue"
        android:textSize="15dp" />

    <RadioButton
        android:id="@+id/radio"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.15"
        android:layout_gravity="center"
        android:onClick="onRadioButtonClicked" />

</LinearLayout>