ListView getView生成Item

public class GenerateItemViewOfGroup extends BaseAdapter
{

	private Context mContext;
	
	private List<String> listOfGroup;
	
	private int sizeOfGroupList;
	
	public GenerateItemViewOfGroup(Context context, List<String> listOfGroup)// 
	{
		mContext = context;
		this.listOfGroup = listOfGroup;
		sizeOfGroupList = listOfGroup.size();
	}
	
	
	class ViewHolder
	{
		
		TextView tvGroupName;// 
		
		LinearLayout llGroupBg;//item 
		
	}
	
	
	
	/**
	 * 
	 * 
	 * */
	public View getView(int position, View convertView, ViewGroup parent) 
	{
		
		ViewHolder viewHolder;
		
		if(convertView == null)// !!! ！
		{
			LayoutInflater myInflater = LayoutInflater.from(mContext);
			
			convertView = myInflater.inflate(R.layout.contact_group_list_item_default, null);// 
			
			viewHolder = new ViewHolder();
			
			viewHolder.llGroupBg = (LinearLayout)convertView.findViewById(R.id.cglid_ll);
			
			viewHolder.tvGroupName = (TextView)convertView.findViewById(R.id.cglid_tv_content);
			
			convertView.setTag(viewHolder);
		}
		else
		{
			
			viewHolder = (ViewHolder)convertView.getTag();
			
		}
		
		String groupName = listOfGroup.get(position);
		
		viewHolder.tvGroupName.setText(groupName);
		
		return convertView;
	}
	
/**
* Item ， 0， 
*/
	public int getCount() {
		// TODO Auto-generated method stub
		return sizeOfGroupList;
	}

	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return null;
	}

	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return 0;
	}

	

}

List<String> listOfGroup = AddANewGroup.queryCurrentGroupInfo(this);// 
		
GenerateItemViewOfGroup myItemView = new GenerateItemViewOfGroup(this, listOfGroup);
		
lvOfGroup.setAdapter(myItemView);