listVew显示从mySql中获取的Jason数组里面的图片

图片存储在本地，在mysql中存储的是图片的本地地址，已经封装成json，传到了客户端，怎么才能显示在listView里面

private void findMeat() {
// TODO Auto-generated method stub
new Thread(new Runnable() {
public void run() {
String url="http://220.167.40.78/HotPot/servlet/MeatServlet?";
String data="dishes_kind="+"荤菜";
final String state=HttpAccessUtil.Get(url, data);//state是服务器传过来的Jason数组
runOnUiThread(new Runnable() {
@Override
public void run() {
try {
List> jsonList=JsonToMap.getList(state);//将Jason转换成list
final SimpleAdapter adapter =new SimpleAdapter(MeatActivity.this,jsonList , R.layout.meat_item,new String[]{
"img","name","price"}, new int[]{R.id.dishes_picture,R.id.dishes_name,R.id.dishes_price});
lv_meat.setAdapter(adapter);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}).start();

public class JsonToMap {

public static Map<String,String> getMap(String jsonString){
    JSONObject jsonObject;
    try {
        jsonObject=new JSONObject(jsonString);
        String img = jsonObject.getString("dishes_picture");
        String name = jsonObject.getString("dishes_name");
        String price = jsonObject.getString("dishes_price");

        Map<String,String> valueMap=new HashMap<String, String>();
        valueMap.put("img", img);
        valueMap.put("name", name);
        valueMap.put("price", price);

        return valueMap;
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return null;

}
public static List<Map<String, String>> getList(String jsonString){ 
    List<Map<String, String>> list=null;
    try {
        JSONArray jsonArray=new JSONArray(jsonString);
        JSONObject jsonObject;
        list=new ArrayList<Map<String,String>>();
        for(int i=0;i<jsonArray.length();i++){
            jsonObject=jsonArray.getJSONObject(i);
            list.add(getMap(jsonObject.toString()));
        }
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return list;
}

}