解决ListView图片加载导致的卡顿问题

public class ContactsListViewAdapter extends BaseAdapter {  
    private LayoutInflater inflater;  
    private ArrayList<ContactDataBean> contactList;  
    private int mLayoutRes;  
    private Context mContext;  
    private ListView lv;  
    private int scrollStauts=0;  
  
    public ContactsListViewAdapter(Context context, int layoutRes, ArrayList<ContactDataBean> contactList, ListView lv) {  
        this.contactList = contactList;  
        this.inflater = LayoutInflater.from(context);  
        this.mContext = context;  
        this.mLayoutRes = layoutRes;  
        this.lv = lv;  
        this.lv.setOnScrollListener(new AbsListView.OnScrollListener() {  
  
            @Override  
            public void onScrollStateChanged(AbsListView view, int scrollState) {  
                // TODO Auto-generated method stub  
                switch (scrollState) {  
                case AbsListView.OnScrollListener.SCROLL_STATE_IDLE://停止  0  
                    scrollStauts=0;  
                    updateUI();  
                    //System.out.println("停止");  
                    break;  
                case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL://触摸滑动  1  
                    scrollStauts=1;  
                      
                    //System.out.println("触摸滑动");  
                    break;