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我得到listView.getChildCount(),设置arrayadapter后为0?

我想从facebook加载图像并填充listview,我能够得到朋友列表和他们的信息,但我想设置图像我得到getChildCount()0,请帮助,

   public static ArrayList<FBUser> fbUserArrayList;
    public static Drawable sharedDrawable;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.friends_list_view);
        this.setTitle("FB Friend List");

        final ListView listView = (ListView) findViewById(R.id.listview);
        FriendListAdapter couponsListAdapter = new FriendListAdapter(this,
                fbUserArrayList);
        listView.setAdapter(couponsListAdapter);

        couponsListAdapter.notifyDataSetChanged();


        setFbUsersImage(listView,fbUserArrayList);

    }

    private void setFbUsersImage(final ListView listView,final ArrayList<FBUser> fbUserArrayList) {
                // here am getting 0 ???
        for (int i = 0; i < listView.getChildCount(); i++) {
 ////           
   }

    }
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