解析JSON数据，setImageBitmap出错

for(int i=0;i JSONObject JOB=ja.getJSONObject(i);
 Map map=new HashMap();
 map.put("textView",JOB.getString("shen"));
 url=JOB.getString("she");
 HttpURLConnection hc=(HttpURLConnection) new URL(url).openConnection();
 is=new BufferedInputStream(hc.getInputStream());
 Bitmap bm=BitmapFactory.decodeStream(is);
 hc.disconnect();
 im.setImageBitmap(bm);//程序执行到这里就出错了
map.put("imageView1",R.drawable.ac);

 list.add(map);
 }
 } catch (JSONException e) {
 e.printStackTrace();
 } catch (Exception e) {
 e.printStackTrace();
 }finally{
 if(is!=null){
 try {
 is.close();
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 }
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