ImageLoader加载一个网址里面的多个图片

public class MainActivity extends AppCompatActivity {
private List<Yy.DataBean> list=new ArrayList<Yy.DataBean>();
String uri="http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
private MyAdapter adapter;
Handler handler = new Handler(){

@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
adapter= new MyAdapter();
lv.setAdapter(adapter);
}
};
private ListView lv;
private ImageLoader instance;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
instance = ImageLoader.getInstance();

lv = (ListView) findViewById(R.id.lv);
try {
new Thread(){
@Override
public void run() {
super.run();
DefaultHttpClient defaultHttpClient = new DefaultHttpClient();
HttpGet httpPost = new HttpGet(uri);
try {
SSLSocketFactory.getSocketFactory().setHostnameVerifier(new AllowAllHostnameVerifier());
HttpResponse response = defaultHttpClient.execute(httpPost);
int code = response.getStatusLine().getStatusCode();
if(code==200){
HttpEntity entity = response.getEntity();
String s = EntityUtils.toString(entity);
Gson gson=new Gson();
Yy yy = gson.fromJson(s, Yy.class);
List<Yy.DataBean> data = yy.getData();
list.addAll(data);
Message msg=new Message();
handler.sendMessage(msg);
//adapter.notifyDataSetChanged();
}
} catch (IOException e) {
e.printStackTrace();
}
}

}.start();
} catch (Exception e) {
e.printStackTrace();
}
}
class MyAdapter extends BaseAdapter{

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

@Override
public Object getItem(int i) {
return null;
}

@Override
public long getItemId(int i) {
return 0;
}

@Override
public View getView(int i, View view, ViewGroup viewGroup) {
if(view==null){
view = View.inflate(MainActivity.this,R.layout.activity_list,null);
}
TextView tv = view.findViewById(R.id.tv);
ImageView iv = view.findViewById(R.id.iv);
tv.setText(list.get(i).getNews_title());
instance.displayImage(list.get(i).getPic_url(),iv);
return view;
}
}
}