Question

您好我正在使用listview并将服务器中的图像显示在其中。

但问题是所有已加载的图像会逐一显示在最后一项中，而是显示在相应的位置上。

请帮我在各自的位置显示图像

public class Offer_adapter extends ArrayAdapter<String> {
Context context1;
String[] offer_title;
String[] offerimg1;
String[] mrp;
String[] offerprice;
String[] you_save;
String[] imgURLArray;
Bitmap bitmap;
ImageView offerimg;
 int a;
LayoutInflater inflater1;

public Offer_adapter(Context context1, String[] offer_title, String[] offerimg1, String[] mrp, String[] you_save, String[] offerprice) {
    super(context1, R.id.offer_list, offer_title);
    this.context1 = context1;
    this.offer_title = offer_title;
    this.offerimg1 = offerimg1;
    this.mrp = mrp;
    this.offerprice = offerprice;
    this.you_save = you_save;
}

private static class ViewHolder {

    String offerimg;

}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder = null;
    if (convertView == null) {
        inflater1 = (LayoutInflater) context1.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater1.inflate(R.layout.offer_list, null);
        viewHolder = new ViewHolder();

    }
    android.util.Log.v("abhi", "" + position);
    imgURLArray = new String[position + 1];
    for (int i = 0; i <= position; i++) {
        android.util.Log.v("abhijit", "" + position);
        imgURLArray[i] = "http://www.surun.co/preost/mod_offer/images/" + offerimg1[position];
        android.util.Log.v("abhi", "" + imgURLArray[position]);
    }
   a=position;
    viewHolder = (ViewHolder) convertView.getTag();
    TextView offertitle = (TextView) convertView.findViewById(R.id.ofrtitle);
    TextView offermrp = (TextView) convertView.findViewById(R.id.offeroriginal);
    offermrp.setPaintFlags(offermrp.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
    TextView offersave = (TextView) convertView.findViewById(R.id.saveoffer);
    TextView ofrprice = (TextView) convertView.findViewById(R.id.priceoffer);
     offerimg = (ImageView) convertView.findViewById(R.id.ofr_img);

    offertitle.setText(offer_title[position]);
    offermrp.setText("Original Price: \u20B9" + mrp[position]);
    offersave.setText("You Save: \u20B9" + you_save[position]);
    ofrprice.setText("Offer Price: \u20B9" + offerprice[position]);
   // Bitmap imageBitmap = null;


    new DownloadAsyncTask().execute(imgURLArray[position]);
    Log.v("abhi","async");
    return convertView;
}

private class DownloadAsyncTask extends AsyncTask<String, String, Bitmap> {

    protected Bitmap doInBackground(String... args) {
        try {
            Log.v("abhi","in do background");
            bitmap = BitmapFactory.decodeStream((InputStream) new URL(args[0]).getContent());
            bitmap = Bitmap.createScaledBitmap(bitmap, 270, 375, true);

        } catch (Exception e) {
            e.printStackTrace();
        }
        return bitmap;
    }

    @Override
    protected void onPostExecute(Bitmap bitmap) {
        super.onPostExecute(bitmap);
        if (bitmap !=null) {
        offerimg.setImageBitmap(bitmap);
        } else {

            offerimg.setImageResource(R.drawable.nooffer);
        }

    }
}
  }

所有图像一个接一个地显示在最后一个项目中。我只想在各自的位置上展示它。

Answer 1

你应该使用延迟加载而不是将图像作为位图下载位图会在某个时候产生问题，或者会在某些设备中出现内存错误

有很多图像加载库可供Android使用。看看这些

https://github.com/square/picasso
https://github.com/nostra13/Android-Universal-Image-Loader
https://code.google.com/p/android-query/wiki/ImageLoading
https://android.googlesource.com/platform/frameworks/volley
https://github.com/koush/UrlImageViewHelper
https://github.com/novoda/image-loader

服务器中的图像未显示在列表视图中

1 个答案: