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

Question

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++) {
 ////           
   }

    }

Answer 1

ListView尚未绘制,因此它没有任何子项.不幸的是,没有回调,例如onResume(),当绘制View时,你可以使用Runnable来做你想要的.

添加
让我们做一些改变onCreate():

listView.setAdapter(couponsListAdapter);
// Remove your calls to notifyDataSetChanged and setFbUsersImage

// Add this Runnable
listView.post(new Runnable() {
    @Override
    public void run() {
        setFbUsersImage(listView,fbUserArrayList);
    }
});

你需要创建listView一个字段变量fbUserArrayList.现在setFbUsersImage()将在ListView有子项时运行.

总而言之,如果您尝试以任何方式修改行,那么适配器是执行此操作的最佳位置.