listview中的多个选定项目保持突出显示android

Question

所以，我所做的是当我点击listview项目时，它变为灰色。但是当我从列表视图中选择另一个项目时，之前突出显示的灰色项目将变为默认值，新项目将变为灰色。

我想要的是让他们两个都突出显示，当点击突出显示的项目时，他们也应该恢复正常。

这是我的代码：

我的ListView XML

    <ListView
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:layout_marginTop="5dp"
    android:id="@+id/listView"
    android:layout_marginRight="10dp"
    android:choiceMode="multipleChoice"
    android:listSelector="@drawable/selector"
    android:layout_alignRight="@+id/group_name"
    android:layout_alignEnd="@+id/group_name" />

我的Color.xml

    <color name="list_pressed">#ffffff</color>
    <color name="list_default">#d3d3d3</color>

我的selector.xml

    <selector xmlns:android="http://schemas.android.com/apk/res/android">

<!-- Selected Item -->
<item android:state_selected="true"
    android:drawable="@color/list_pressed" />

<!-- Default Item -->
<item
    android:state_selected="false"
    android:drawable="@color/list_default" />
 </selector>

Onclick Listner

  listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
    {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id)
        {
            view.setSelected(true);

            GroupList clickedGroup = mygroupList.get(position);
            String message = " you clicked name " + position + " and name is " + clickedGroup.getname();
            Toast.makeText(addgroups.this, message, Toast.LENGTH_LONG).show();

        }
    });

等待帮助并提前致谢。

编辑： 这是我的listAdapter

 private class MyListAdapter extends ArrayAdapter<GroupList>
 {
    public MyListAdapter()
    {
        super(addgroups.this, R.layout.grouplist, mygroupList);
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {

        View itemView = convertView;
        if(itemView == null)
        {
            itemView = getLayoutInflater().inflate(R.layout.grouplist, parent, false);
        }

        //find the contact to work
        GroupList currentgroup =  mygroupList.get(position);

        TextView contactname = (TextView) itemView.findViewById(R.id.group_name);
        contactname.setText(currentgroup.getname());

        ImageView imageView = (ImageView) itemView.findViewById(R.id.add);
        imageView.setImageResource(currentgroup.getimg());

        return  itemView;
        //return super.getView(position, convertView, parent);
    }
}