1

我正在使用Volley来缓存应用程序中的图像。内存缓存工作正常，但没有图像缓存在磁盘上。代码如下

VolleySingleton.java

public class VolleySingleton {

    public static final String TAG = "VolleySingleton";

     private static VolleySingleton mInstance = null;
    private RequestQueue mRequestQueue;
    private ImageLoader mImageLoader;

    private VolleySingleton(Context context){

        mRequestQueue = Volley.newRequestQueue(context);
        mImageLoader = new ImageLoader(this.mRequestQueue,new ImageLoader.ImageCache() {

            private final LruCache<String, Bitmap> mCache = new LruCache<String, Bitmap>(3);

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

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

    public static VolleySingleton getmInstance(Context context){
        if(mInstance == null){
            mInstance = new VolleySingleton(context);
        }
        return mInstance;
    }

    public RequestQueue getmRequestQueue(){
        return this.mRequestQueue;
    }

    public ImageLoader getmImageLoader(){
        return mImageLoader;
    }
}

图像加载到 CustomAdapter ChannelAdapter.java

private class ChannelAdapter extends BaseAdapter{

    private LayoutInflater inflater;
    private VolleySingleton volleySingleton;

    public ChannelAdapter(Context context) {
        super(context);
        inflater = (LayoutInflater)             context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        volleySingleton = VolleySingleton.getmInstance(context);
    }


    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        if(view == null){
            view = inflater.inflate(R.layout.item,viewGroup,false);
        }
        NetworkImageView imageView = (NetworkImageView) view.findViewById(R.id.imageView);
        TextView textView = (TextView) view.findViewById(R.id.textView);
        textView.setText(tvChannel.getName());
        imageView.setImageUrl(tvChannel.getImages().get(link,volleySingleton.getmImageLoader());

        return  view;
    }
}
4

2 回答 2

4

好的，我解决了这个问题。这是因为我从服务器获得的图像在其响应中将缓存控制标签设置为无缓存

Cache-Control: no-cache,no-cache,max-age=15552000

HttpHeaderParser.java我通过在库中进行修改使凌空忽略了这个标签。现在它工作正常

于 2014-02-04T06:42:06.993 回答
1

@SathMk

我建议你不要忽略任何标签 Cache-Control Header ，如果你真的希望在标题说 no-cahce 时缓存图像更长的时间，那么你可以欺骗增加 max-age 如果它像你的缓存中那样非零。否则，您将无法使缓存为数据请求正常工作。

if (headerValue != null) {
        hasCacheControl = true;
        String[] tokens = headerValue.split(",");
        for (int i = 0; i < tokens.length; i++) {
            String token = tokens[i].trim();
            if (token.equals("no-cache") || token.equals("no-store")) {
                //Check if no-cache is there then still check again the max-age
                if (token.startsWith("max-age=")) {
                    try {
                        maxAge = Long.parseLong(token.substring(8));
                    } catch (Exception e) {
                        return null;
                    }
                }
            } else if (token.startsWith("max-age=")) {
                try {
                    maxAge = Long.parseLong(token.substring(8));
                } catch (Exception e) {
                }
            } else if (token.equals("must-revalidate") || token.equals("proxy-revalidate")) {
                maxAge = 0;
            }
        }
    }

检查是否没有缓存，然后再次检查 max-age

于 2015-01-17T12:35:19.667 回答