我从网上下载了一张图片。

private void downloadPost()
    {
        HttpURLConnection conn = null;
        try
        {
            URL url = new URL(IMAGE_URL);
            conn = (HttpURLConnection) url.openConnection();
            if (conn.getResponseCode() == HttpStatus.SC_OK)
            {
                InputStream is = conn.getInputStream();
                Bitmap bitmap = BitmapFactory.decodeStream(is);
                Message msg = new Message();
                msg.obj = bitmap;
                msg.what = 1;
                handler.sendMessage(msg);
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

传给Handler处理的时候，如果设置了bitmap的回收，则imageview.setImageBitmap(bitmap);没有显示图片，但是注视掉以后就显示了，是我回收的地方不对吗？

public void handleMessage(Message msg)
        {
            super.handleMessage(msg);
            switch (msg.what)
            {
                case 1:
                    Bitmap bitmap = (Bitmap) msg.obj;
                    imageview.setImageBitmap(bitmap);
                    if (bitmap != null && !bitmap.isRecycled())
                    {
                        bitmap.recycle();
                    }
                    break;
            }
        }