如何使用SimpleAdapter将BitMap添加到ListView？

Question

这是我尝试过的：

List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>();

for(int i=0;i<len;i++){
    HashMap<String, String> hm = new HashMap<String,String>();
    hm.put("tit", "Title : " + title[i]);
    hm.put("init","Initial Price : " + cur_price[i]);
    hm.put("cur","Current Price  : " + init_price[i]);
    hm.put("img", bitmap[i].toString() );
    aList.add(hm); //I'm getting an error here
}

// Keys used in Hashmap
String[] from = { "tit","init","cur","img"};

// Ids of views in listview_layout
int[] to = { R.id.tit,R.id.init,R.id.cur,R.id.img};


SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), 
aList, R.layout.listview_layout, from, to);

ListView listView = ( ListView ) findViewById(R.id.listview);

listView.setAdapter(adapter);
}

我认为使用Bitmap分配一个imageview，可能会使用类似的东西：

 ImageView logoimg = (ImageView) findViewById(R.id.logo);
            logoimg.setImageBitmap(bitmap);

1）但是我怎样才能在SimpleAdapter中做同样的事情？

2）此外，为什么我在HashMap的add（）方法中出错？