listview多条目加载

最新推荐文章于 2019-01-03 16:26:42 发布

得不到的都释怀

最新推荐文章于 2019-01-03 16:26:42 发布

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本文链接：https://blog.youkuaiyun.com/css0902/article/details/73867375

本文介绍了一个名为FragmentData的Android类，该类通过自定义的MyAdapter适配器加载不同类型的图片列表，并使用ImageLoader进行图片加载。MyAdapter根据列表中图片数量的不同显示对应的布局。

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public class FragmentData extends Fragment {
    private XListView lv;
    private MyAdapter adapter;
    private List<Data.DataBean> list = new ArrayList<>();
   
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater,
                             @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment, null);
        lv = (XListView) view.findViewById(R.id.lv);
        
        adapter = new MyAdapter();
        lv.setAdapter(adapter);
  
        return view;
    }

    class MyAdapter extends BaseAdapter {

        final int TYPE0 = 0;
        final int TYPE1 = 1;
        final int TYPE3 = 2;
        ImageLoader imageLoader;
        DisplayImageOptions options;

        public MyAdapter() {
            imageLoader = ImageLoader.getInstance();
            ImageLoaderConfiguration config = ImageLoaderConfiguration.createDefault(getActivity());
            imageLoader.init(config);

            options = new DisplayImageOptions.Builder()
                    .showImageOnLoading(R.mipmap.ic_launcher)
                    .build();
        }

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int position) {
            return list.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public int getItemViewType(int size) {
            switch (size) {
                case 0:
                    return TYPE0;
                case 1:
                    return TYPE1;
                case 3:
                    return TYPE3;
                default:
                    return TYPE0;
            }
        }

        @Override
        public int getViewTypeCount() {
            return 3;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            Data.DataBean bean = list.get(position);
            List<Data.DataBean.ImageListBean> listImages = bean.getImage_list();
            int size = listImages != null ? bean.getImage_list().size() : 0;
            int type = getItemViewType(size);


            ViewHolder holder = null;
            convertView = null;
            if (convertView == null) {
                holder = new ViewHolder();
                switch (type) {
                    case TYPE0:
                        convertView = View.inflate(getActivity(), R.layout.item, null);
                        break;
                    case TYPE1:
                        convertView = View.inflate(getActivity(), R.layout.item1, null);
                        holder.image = (ImageView) convertView.findViewById(R.id.image);
                        break;
                    case TYPE3:
                        convertView = View.inflate(getActivity(), R.layout.item2, null);
                        holder.image = (ImageView) convertView.findViewById(R.id.image);
                        holder.image2 = (ImageView) convertView.findViewById(R.id.image2);
                        holder.image3 = (ImageView) convertView.findViewById(R.id.image3);
                        break;
                }
                holder.title = (TextView) convertView.findViewById(R.id.title);
                holder.source = (TextView) convertView.findViewById(R.id.source);

                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            holder.title.setText(bean.getTitle() + "-" + size);
            holder.source.setText(bean.getSource());


            switch (type) {
                case TYPE1:
                    imageLoader.displayImage(listImages.get(0).getUrl(), holder.image, options);
                    break;
                case TYPE3:
                    imageLoader.displayImage(listImages.get(0).getUrl(), holder.image, options);
                    imageLoader.displayImage(listImages.get(1).getUrl(), holder.image2, options);
                    imageLoader.displayImage(listImages.get(2).getUrl(), holder.image3, options);
                    break;
            }
            return convertView;
        }
    }
    class ViewHolder {
        TextView title, source;
        ImageView image, image2, image3;
    }
}