我正在使用圖像加載器來顯示來自json解析的圖像和文本。文字正在顯示,但圖像不顯示。沒有錯誤,但它顯示默認圖標。任何人請幫助我爲什麼圖像不顯示。我的代碼如下:使用圖像加載器時圖像不顯示android
public class GridAdapter extends ArrayAdapter<Persons> {
ArrayList<Persons> personList;
LayoutInflater layoutInflater;
int Resource;
ViewHolder viewHolder;
ImageLoader imageLoader; // declared image laoder
public GridAdapter(Context context, int resource, ArrayList<Persons> objects) {
super(context, resource, objects);
layoutInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = resource;
personList = objects;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return super.getCount();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v= convertView;
imageLoader = new ImageLoader(getContext()); // since thrown null pointer exception when i declared this, it's not declaring null pointer exception but image is not displaying, default icon set in ImageLoader is displaying..
if(v==null){
viewHolder = new ViewHolder();
v = layoutInflater.inflate(Resource, null);
viewHolder.tvName=(TextView)v.findViewById(R.id.tvname);
viewHolder.imageview=(ImageView)v.findViewById(R.id.picture);
v.setTag(viewHolder);
}
else{
viewHolder = (ViewHolder) v.getTag();
}
viewHolder.tvName.setText(personList.get(position).getName());
imageLoader.DisplayImage(personList.get(position).getImage(),viewHolder.imageview);// this is not working..
// TODO Auto-generated method stub
return v;
}
static class ViewHolder {
public ImageView imageview;
public TextView tvName;
}
}
注:
,如果我用這個,
私有類DownloadImageTask擴展的AsyncTask { ImageView的bmImage;
public DownloadImageTask(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(result);
}
}
和ImageView的設置爲
new DownloadImageTask(holder.imageview).execute(actorList.get(position).getImage());
它的工作..但每次當我向下滾動,向上移動,圖像被下載。我需要顯示在緩存中。所以我使用了圖像加載器。但它不顯示圖像。
檢查圖像的網址可能是錯誤的或檢查您的項目的網絡許可 – 2014-10-07 12:59:09
@NaveenTamrakar我給了權限。請檢查我的編輯。 – Star 2014-10-07 13:06:14
試試'imageLoader = ImageLoader.getInstance(); imageLoader.init();'並將其放在適配器的構造函數中。 – 2014-10-07 13:09:50