我正试图制作一个定制清单改编器,该改编器有其从互联网下载所需每一项目的图像。 在我首次进入活动时——在图像下载之前冻结一台,然后装上活动清单。

由于我可以在活动负荷之前下载图像。 在活动负荷后,我如何下载图像。 我认为,我需要利用阿森特任务。 但是,由于我装上了“Array”改编机的图像,我无法确定如何做到这一点。

这是我的习惯改编器getView():

public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;

        if (v == null) {
            LayoutInflater vi;
            vi = LayoutInflater.from(getContext());
            v = vi.inflate(R.layout.list_item_default, null);
        }

        Item p = items.get(position);

        if (p != null) {

            TextView list_title = (TextView) v.findViewById(R.id.list_title);
            TextView list_description = (TextView) v
                    .findViewById(R.id.list_description);
            TextView list_timestamp = (TextView) v
                    .findViewById(R.id.list_timestamp);
            ImageView list_image = (ImageView) v.findViewById(R.id.list_image);

            if (list_title != null) {
                list_title.setText(p.getItemTitle());
            }

            if (list_description != null) {
                list_description.setText(p.getItemDescription());
            }

            if (list_timestamp != null) {
                list_timestamp.setText(p.getItemTimestamp());
            }

            if (list_image != null) {
                Log.d("bMobile", "inside getView() image");
                try {
                    URL imageURL = new URL(p.getItemImage());
                    HttpURLConnection con = (HttpURLConnection) imageURL
                            .openConnection();
                    InputStream inputStrem = con.getInputStream();
                    Bitmap image = BitmapFactory.decodeStream(inputStrem);
                    if (null != image)
                        list_image.setImageBitmap(image);
                    else
                        Log.d("bMobile", "Bitmap is Null");
                } catch (Exception e) {
                }
            }
        }

        return v;
    }

AsyncTask:

public class DownloadImagesTask extends AsyncTask<ImageView, Void, Bitmap> {

    ImageView imageView = null;

    @Override
    protected Bitmap doInBackground(ImageView... imageViews) {
        this.imageView = imageViews[0];
        return download_Image((String)imageView.getTag());
    }

    @Override
    protected void onPostExecute(Bitmap result) {
        imageView.setImageBitmap(result);
    }

}
    private Bitmap download_Image(String url) {

        Bitmap bmp =null;
        try{
            URL ulrn = new URL(url);
            HttpURLConnection con = (HttpURLConnection)ulrn.openConnection();
            InputStream is = con.getInputStream();
            bmp = BitmapFactory.decodeStream(is);
            if (null != bmp)
                return bmp;

            }catch(Exception e){}
        return bmp;
    }