xlistview+多條目+imageLoader的綜合應用

public class Fragment02 extends Fragment implements XListView.IXListViewListener {


    String url="http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
    List<Product.DataBean> list=new ArrayList<>();
    private ImageLoader instance;
    private MAdapter mAdapter;
    private XListView xlistview;
    int page;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=View.inflate(getActivity(), R.layout.activity_fragment02,null);
        xlistview = (XListView) view.findViewById(R.id.xlistview);
        instance = ImageLoader.getInstance();
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        initData(0);
        mAdapter =new MAdapter();
        xlistview.setAdapter(mAdapter);
        xlistview.setPullLoadEnable(true);
        xlistview.setXListViewListener(this);//xlistview上下拉監聽。。。必須有
    }

    private void initData(int page) {
        new MAsyncTask().execute(url+page);
    }

    //下拉刷新

   @Override
    public void onRefresh() {
        list.clear();
        initData(0);
    }

    //上拉加載

   @Override
    public void onLoadMore() {
        page++;
        initData(page);
    }

    private class MAdapter extends BaseAdapter{
        @Override
        public int getViewTypeCount() {
            return 2;
        }

        @Override
        public int getItemViewType(int position) {
            return position%2;
        }

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

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

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

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            int viewType=getItemViewType(i);
            switch (viewType){
                case 0:
                    ViewHolder viewHolder=null;
                    if(view==null){
                        viewHolder=new ViewHolder();
                        view=View.inflate(getActivity(),R.layout.item,null);
                        viewHolder.textview=(TextView)view.findViewById(R.id.textview);
                        viewHolder.imageView=(ImageView)view.findViewById(R.id.imageview);
                        view.setTag(viewHolder);
                    }else{
                        viewHolder= (ViewHolder) view.getTag();
                    }
                    viewHolder.textview.setText(list.get(i).getNews_title());
                    instance.displayImage(list.get(i).getPic_url(),viewHolder.imageView);
                    break;
                case 1:
                    ViewHolder1 viewHolder1=null;
                    if(view==null){
                        viewHolder1=new ViewHolder1();
                        view=View.inflate(getActivity(),R.layout.item1,null);
                        viewHolder1.textView1=(TextView)view.findViewById(R.id.textView1);
                        viewHolder1.textView2=(TextView)view.findViewById(R.id.textView2);
                        view.setTag(viewHolder1);
                    }else{
                        viewHolder1= (ViewHolder1) view.getTag();
                    }
                    viewHolder1.textView1.setText(list.get(i).getNews_title());
                    viewHolder1.textView2.setText(list.get(i).getNews_summary());
                    break;

            }
            return view;
        }
    }

    private class MAsyncTask extends AsyncTask<String,Void,String>{
        @Override
        protected String doInBackground(String... strings) {
            return NetUtil.getNetJson(strings[0]);
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Gson gson = new Gson();
            Product product = gson.fromJson(s, Product.class);
            List<Product.DataBean> data = product.getData();
            list.addAll(data);
            mAdapter.notifyDataSetChanged();
            uicomplete();//停止刷新的方法
        }
    }

    private void uicomplete() {
        xlistview.stopRefresh();
        xlistview.stopLoadMore();
        xlistview.setRefreshTime("剛剛"+System.currentTimeMillis());
    }

    private class ViewHolder {
        TextView textview;
        ImageView imageView;
    }
    private class ViewHolder1{
        TextView textView1;
        TextView textView2;
    }
}