smallAction 2016-07-23 02:52 采纳率: 33.3%
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volley中ImageLoader报空指针异常

public class StoreBookListAdapter extends BaseAdapter{
private List books;
private LayoutInflater inflater;
private RequestQueue mQueue;
private ImageLoader loader;

public StoreBookListAdapter(Context context,
        List<Book> reCommendBooks) {
    this.mQueue = MyApplication.geRequestQueue();
    this.loader = new ImageLoader(mQueue, new BitmapCache());
    Log.i("info", "loader="+loader.toString());
    this.books = reCommendBooks;
    this.inflater = LayoutInflater.from(context);

}   
public class BitmapCache implements ImageCache {  
    private LruCache<String, Bitmap> mCache;  
    public BitmapCache() {  
        int maxSize = 10 * 1024 * 1024;  
        mCache = new LruCache<String, Bitmap>(maxSize) {  
            @Override  
            protected int sizeOf(String key, Bitmap bitmap) {  
                return bitmap.getRowBytes() * bitmap.getHeight();  
            }  
        };  
    }  

    @Override  
    public Bitmap getBitmap(String url) {  
        return mCache.get(url);  
    }  

    @Override  
    public void putBitmap(String url, Bitmap bitmap) {  
        mCache.put(url, bitmap);  
    }  

}



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

@Override
public Book getItem(int position) {
    return books.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    if(convertView==null) {
        holder = new ViewHolder();
        convertView = inflater.inflate(R.layout.item_store_gv_book,null);
        holder.iamgeView = (ImageView) convertView.findViewById(R.id.imageView);
        holder.textView = (TextView) convertView.findViewById(R.id.textView);
        convertView.setTag(holder);
    }
    holder = (ViewHolder) convertView.getTag();
    Book book = getItem(position);
    holder.textView.setText(book.getProductName());
    //批量下载
    ImageListener listener = ImageLoader.getImageListener(holder.iamgeView, R.drawable.ic_launcher, R.drawable.ic_launcher);
    loader.get(book.getProduct_pic(), listener);

    return convertView;
}

class ViewHolder {
    ImageView iamgeView;
    TextView textView;
}![图片说明](https://img-ask.csdn.net/upload/201607/23/1469242280_999062.png)

![图片说明](https://img-ask.csdn.net/upload/201607/23/1469242291_816035.png)
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  • smallAction 2016-07-23 02:54
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    图片说明

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