ListView多条目加载,根据图片判断所需要加载的类型

MainActivity

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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.google.gson.Gson;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;

import static android.R.attr.numberPickerStyle;
import static android.R.attr.type;

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private Gson gson;
    private String path = "http://v.juhe.cn/toutiao/index?type=top&key=2f092bd9ce76c0257052d6d3c93c11b4";
    private List<Bean.ResultBean.DataBean> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listview);
        new My().execute();
    }

    class My extends AsyncTask {

        @Override
        protected Object doInBackground(Object[] objects) {
            String string = "";
            try {
                URL url = new URL(path);
                HttpURLConnection con = (HttpURLConnection) url.openConnection();
//                con.setConnectTimeout(5000);
//                con.setReadTimeout(5000);
                int code = con.getResponseCode();
                if (code == 200) {
                    InputStream is = con.getInputStream();
                    byte[] b = new byte[1024];
                    int l = 0;
                    while ((l = is.read(b)) != -1) {
                        String str = new String(b, 0, l);
                        string += str;
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

            return string;
        }

        @Override
        protected void onPostExecute(Object o) {

            gson = new Gson();
            Bean bean = gson.fromJson((String) o, Bean.class);
            list = bean.getResult().getData();

            MyAdapter adapter = new MyAdapter();
            listView.setAdapter(adapter);
        }
    }

    public class MyAdapter extends BaseAdapter {
        @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 int getViewTypeCount() {
            return 4;
        }

        @Override
        public int getItemViewType(int position) {
            if (list.get(position).getThumbnail_pic_s03() != null) {
                return 3;
            } else if (list.get(position).getThumbnail_pic_s02() != null) {
                return 2;
            } else if (list.get(position).getThumbnail_pic_s() != null) {
                return 1;
            }
            return 0;
        }


        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            Holder holder = null;
            Holder2 holder2 = null;
            Holder3 holder3 = null;
            int type = getItemViewType(i);
            if (type == 3) {
                if (view == null) {
                    view = View.inflate(MainActivity.this, R.layout.item3, null);
                    holder3 = new Holder3();
                    holder3.te3 = view.findViewById(R.id.te3);
                    holder3.item3_img1 = view.findViewById(R.id.item3_img1);
                    holder3.item3_img2 = view.findViewById(R.id.item3_img2);
                    holder3.item3_img3 = view.findViewById(R.id.item3_img3);
                    view.setTag(holder3);
                } else {
                    holder3 = (Holder3) view.getTag();
                }
                holder3.te3.setText(list.get(i).getTitle());

                String item3_img1 = list.get(i).getThumbnail_pic_s();
                ImageLoader il = ImageLoader.getInstance();
                il.displayImage(item3_img1, holder3.item3_img1);

                String item3_img2 = list.get(i).getThumbnail_pic_s02();
                ImageLoader il2 = ImageLoader.getInstance();
                il2.displayImage(item3_img2, holder3.item3_img2);

                String item3_img3 = list.get(i).getThumbnail_pic_s03();
                ImageLoader il3 = ImageLoader.getInstance();
                il3.displayImage(item3_img3, holder3.item3_img3);
            } else if (type == 2) {
                if (view == null) {
                    view = View.inflate(MainActivity.this, R.layout.item2, null);
                    holder2 = new Holder2();
                    holder2.te2 = view.findViewById(R.id.te2);
                    holder2.item2_img1 = view.findViewById(R.id.item2_img1);
                    holder2.item2_img2 = view.findViewById(R.id.item2_img2);
                    view.setTag(holder2);
                } else {
                    holder2 = (Holder2) view.getTag();
                }
                holder2.te2.setText(list.get(i).getTitle());

                String item2_img1 = list.get(i).getThumbnail_pic_s();
                ImageLoader il = ImageLoader.getInstance();
                il.displayImage(item2_img1, holder2.item2_img1);

                String item2_img2 = list.get(i).getThumbnail_pic_s02();
                ImageLoader il2 = ImageLoader.getInstance();
                il2.displayImage(item2_img2, holder2.item2_img2);
            } else {
                if (view == null) {
                    view = View.inflate(MainActivity.this, R.layout.item1, null);
                    holder = new Holder();
                    holder.te1 = view.findViewById(R.id.te1);
                    holder.item1_img1 = view.findViewById(R.id.item1_img1);
                    view.setTag(holder);
                } else {
                    holder = (Holder) view.getTag();
                }
                holder.te1.setText(list.get(i).getTitle());

                String item1_img1 = list.get(i).getThumbnail_pic_s();
                ImageLoader instance = ImageLoader.getInstance();
                instance.displayImage(item1_img1, holder.item1_img1);
            }
            return view;
        }

    }

    class Holder {
        TextView te1;
        ImageView item1_img1;

    }

    class Holder2 {
        TextView te2;
        ImageView item2_img1;
        ImageView item2_img2;
    }

    class Holder3 {
        TextView te3;
        ImageView item3_img1;
        ImageView item3_img2;
        ImageView item3_img3;
    }
}

Myapp

import android.app.Application;

import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

/**
 * Created by lenovo on 2017/09/08.
 */

public class Myapp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        ImageLoaderConfiguration aDefault = ImageLoaderConfiguration.createDefault(getApplicationContext());
        ImageLoader.getInstance().init(aDefault);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
  >

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></ListView>
</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   >

    <uses-permission android:name="android.permission.INTERNET" />
    <application
        android:name=".Myapp"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>