列表视图在滚动时显示错误位置的图像

Question

我有一个ListView,我从服务器填充.一切正常但单个问题是滚动时下载的图像显示在错误的项目位置.只有几秒钟后,它才会在正确的位置显示正确的图像.

这是我的ArrayAdapter类,其中包含AsynchTask:

public class ApplicationAdapter extends ArrayAdapter<Application> {
    private List<Application> items;

    public ApplicationAdapter(Context context, List<Application> items) {
        super(context, R.layout.app_custom_list, items);
        this.items = items;
    }

    @Override
    public int getCount() {
        return items.size();
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View v = convertView;

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

        Application app = items.get(position);

        if (app != null) {
            ImageView imageView = (ImageView) v.findViewById(R.id.appIcon);
            TextView titleText  = (TextView) v.findViewById(R.id.titleTxt);

            if (imageView != null) {

                String path_image = app.getImagePath();

                // Call AsynchTask to load image into ImageView from path
                DownloadImageTask1 d = new DownloadImageTask(imageView);
                d.execute(path_image);
            }


            if (titleText != null) {

                titleText.setText(app.getTitle());

            }

        }

        return v;
    }

private class DownloadImageTask1 extends AsyncTask<String, Void, Bitmap> {
    ImageView bmImage;

    public DownloadImageTask1(ImageView bmImage) {
        this.bmImage = bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon11 = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return mIcon11;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(getRoundedCornerBitmap(result));

    }
}

有人可以指导我走向正确的方向吗？我已经工作了几天来解决这个问题.谢谢!!!

Answer 1

这是因为滚动ImageView时会重复使用listview.在中显示加载图像listview onPreExecute.如果你使用像毕加索这样的图书馆,它会更好.因为它为您完成所有工作,包括将图像保存在捕获中