Android用simpleAdapter来直接显示bitmap图片

adapter=new SimpleAdapter(this, 
                data,// 数据源
                R.layout.activity_new_product_item,// 显示布局 
                new String[] { "itemImage", "itemText", "itemNewPrice", "itemOldPrice" }, 
                new int[] { R.id.itemImage, R.id.itemText, R.id.newprice, R.id.oldprice });
        adapter.setViewBinder(new ViewBinder() {
            
            @Override
            public boolean setViewValue(View view, Object data,
                    String textRepresentation) {
                if( (view instanceof ImageView) & (data instanceof Bitmap) ) {  
                    ImageView iv = (ImageView) view;  
                    Bitmap bm = (Bitmap) data;  
                    iv.setImageBitmap(bm);  
                    return true;  
                    }  
                    return false; 
            }
        });
        gridView.setAdapter(adapter);