毕加索IllegalArgumentException [英] Picasso IllegalArgumentException

问题描述

我正在尝试使用毕加索为列表视图加载Facebook照片.

I'm trying to use Picasso to load facebook photos for a listview.

我收到" java.lang.IllegalArgumentException:目标不得为空"

在此行:

.into(holder.userpicture);

如果用户图片ImageView是目标"，那么我听不懂.我的猜测是它与我的适配器有关，但我不知道是什么.

If the userpicture ImageView is the 'target', then I don't understand. My guess is that it has something to do with my adapter, but I can't figure out what.

非常感谢所有帮助！

编辑

我发现了问题.我犯了一个粗心的错误.在这一行，我忘记了convertView部分:

I found the problem. I made a careless mistake. On this line, I forgot the convertView part:

holder.userpicture=(ImageView)findViewById(R.id.userpicture);

Logcat:

06-01 16:37:14.392: E/AndroidRuntime(7885): java.lang.IllegalArgumentException: Target must not be null.
06-01 16:37:14.392: E/AndroidRuntime(7885):     at com.squareup.picasso.RequestCreator.into(RequestCreator.java:479)
06-01 16:37:14.392: E/AndroidRuntime(7885):     at com.squareup.picasso.RequestCreator.into(RequestCreator.java:462)
06-01 16:37:14.392: E/AndroidRuntime(7885):     at com.example.mywebsite.AllProductsActivity$MyAdapter.getView(AllProductsActivity.java:327)

MyAdapter:

public class MyAdapter extends ArrayAdapter<HashMap<String, String>> {

    Context context;
    int resourceId;
    LayoutInflater inflater;
    private Context mContext;


    ArrayList<HashMap<String, String>>  items;
    public MyAdapter (Context context, int resourceId, ArrayList<HashMap<String, String>> items)
    {
        super(context, resourceId, items);
        mContext = context;
        this.items =items;
        inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        final ViewHolder holder;
        if (convertView == null){

            convertView = inflater.inflate(R.layout.list_item, null);

            holder = new ViewHolder();
            holder.name = (TextView)convertView.findViewById(R.id.name);
            holder.userpicture=(ImageView)findViewById(R.id.userpicture);
            convertView.setTag(holder);

        } else {

            holder = (ViewHolder)convertView.getTag();
        }

        HashMap<String,String> item = (HashMap<String,String> ) items.get(position);
        if (item != null)
        {

            String facebookProfilePicUrl = "http://graph.facebook.com/"+TAG_FACEBOOKID+"/picture?width=100&height=100";

           Picasso.with(mContext).load(facebookProfilePicUrl)
.into(holder.userpicture);

            holder.name.setText(item.get(TAG_FACEBOOKID));


        }

        return convertView;
    }

    public class ViewHolder
    {
        TextView    name;
        ImageView userpicture;
    }
}

推荐答案

大概holder.userpicture是null. res/layout/list_item没有名为userpicture的小部件，或者您需要清理项目(例如，从Eclipse主菜单中的Project> Clean).

Presumably, holder.userpicture is null. Either res/layout/list_item does not have a widget named userpicture, or you need to clean your project (e.g., Project > Clean from the Eclipse main menu).

此外，请使用inflate()的三参数版本，因此，如果将行布局更改为使用RelativeLayout根，就不会遇到问题.

Also, please use the three-parameter version of inflate(), so you do not run into problems if you change your row layout to use a RelativeLayout root.

这篇关于毕加索IllegalArgumentException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！