ListView多條目加載以及優化

package com.bwie.yuekao01.fragment;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.bwie.yuekao01.R;
import com.bwie.yuekao01.bean.MenuInfo;
import com.google.gson.Gson;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.List;


/**
 * Created by Shadow on 2017/7/21.
 */

public class GnFragment extends Fragment {

    private View view;
    private ListView lv;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        view = inflater.inflate(R.layout.fragment02, container, false);


        return view;
    }

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

        lv = (ListView) view.findViewById(R.id.lv);
        loadData("http://apis.juhe.cn/cook/query.php?menu=%E9%BB%84%E7%84%96%E9%B8%A1&key=85ccc6561e8247986f378b20ef34589a");
    }


    private void loadData(String path) {
        new AsyncTask<String, Void, String>() {
            @Override
            protected String doInBackground(String... params) {

                String url = params[0];
                try {
                    HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
                    connection.setConnectTimeout(5000);
                    connection.setReadTimeout(5000);
                    connection.setRequestMethod("GET");
                    if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                        InputStream is = connection.getInputStream();
                        ByteArrayOutputStream baos = new ByteArrayOutputStream();
                        int len = 0;
                        byte[] bytes = new byte[1024];
                        while ((len = is.read(bytes)) != -1) {
                            baos.write(bytes, 0, len);
                        }
                        is.close();
                        baos.close();
                        System.out.println("*******************************黃燜雞" + baos.toString());
                        return baos.toString();

                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

                return null;
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                if (s != null) {
                    Gson gson = new Gson();
                    MenuInfo menuInfo = gson.fromJson(s, MenuInfo.class);
                    List<MenuInfo.ResultBean.DataBean> list = menuInfo.getResult().getData();


                    Myadapter myadapter = new Myadapter(list);
                    lv.setAdapter(myadapter);
                }
            }
        }.execute(path);


    }

    class Myadapter extends BaseAdapter {

        List<MenuInfo.ResultBean.DataBean> list;

        DisplayImageOptions options;

        public Myadapter(List<MenuInfo.ResultBean.DataBean> list) {
            this.list = list;
            options = new DisplayImageOptions.Builder()
                    .showImageOnFail(R.mipmap.ic_launcher)
                    .cacheInMemory(true)
                    .cacheOnDisk(true)
                    .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 getViewTypeCount() {
            return 2;
        }

        @Override
        public int getItemViewType(int position) {
            if (position % 2 == 0) {
                return 0;
            } else {
                return 1;
            }

        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            int type = getItemViewType(position);

            ViewHolder holder = null;
            ViewHolder2 holder2 = null;
            switch (type) {
                case 0:
                    if (convertView == null) {
                        holder = new ViewHolder();
                        convertView = convertView.inflate(getActivity(), R.layout.listview_item, null);
                        holder.imageview = (ImageView) convertView.findViewById(R.id.ivIcon);
                        holder.textview = (TextView) convertView.findViewById(R.id.tvContent);
                        convertView.setTag(holder);
                    } else {
                        holder = (ViewHolder) convertView.getTag();
                    }

                    ImageLoader.getInstance().displayImage(list.get(position).getAlbums().get(0),
                            holder.imageview, options);
                    holder.textview.setText(list.get(position).getTitle());
                    break;
                case 1:
                    if (convertView == null) {
                        holder2 = new ViewHolder2();
                        convertView = convertView.inflate(getActivity(), R.layout.listview_item2, null);
                        holder2.imageview2 = (ImageView) convertView.findViewById(R.id.ivIcon);
                        holder2.textview2 = (TextView) convertView.findViewById(R.id.tvContent);
                        convertView.setTag(holder2);
                    } else {
                        holder2 = (ViewHolder2) convertView.getTag();
                    }

                    ImageLoader.getInstance().displayImage(list.get(position).getAlbums().get(0),
                            holder2.imageview2, options);
                    holder2.textview2.setText(list.get(position).getTitle());
                    break;
            }


            return convertView;
        }

        class ViewHolder {
            ImageView imageview;
            TextView textview;
        }

        class ViewHolder2 {
            ImageView imageview2;
            TextView textview2;
        }
    }
}