我试图在我的应用程序中的 Volley 类的 NetworkImageView 中禁用缓存。我尝试了这段代码,但它没有删除缓存。
mNetworkImageView = (NetworkImageView) getView().findViewById(R.id.networkImageView);
mImageLoader = VolleySingleton.getInstance().getImageLoader();
mNetworkImageView.setImageUrl(IMAGE_URL, mImageLoader);
VolleySingleton.getInstance().getRequestQueue().getCache().remove(IMAGE_URL);
最佳答案
您可以尝试以下操作(在 VolleySingleton
类中):
mImageLoader = new ImageLoader(mRequestQueue, new ImageLoader.ImageCache() {
@Override
public Bitmap getBitmap(String url) {
return null;
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
}
});
调试时可以检查一下,在ImageLoader.java
内的Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
行设置断点,你会发现cachedBitmap
空。
或者将 Log.w("cachedBitmap", "Bitmap cached!");
作为我要检查的以下代码:
public ImageContainer get(String requestUrl, ImageListener imageListener,
int maxWidth, int maxHeight, ScaleType scaleType) {
// only fulfill requests that were initiated from the main thread.
throwIfNotOnMainThread();
final String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
// Try to look up the request in the cache of remote images.
Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {
Log.w("cachedBitmap", "Bitmap cached!");
// Return the cached bitmap.
ImageContainer container = new ImageContainer(cachedBitmap, requestUrl, null, null);
imageListener.onResponse(container, true);
return container;
}
// The bitmap did not exist in the cache, fetch it!
ImageContainer imageContainer =
new ImageContainer(null, requestUrl, cacheKey, imageListener);
// Update the caller to let them know that they should use the default bitmap.
imageListener.onResponse(imageContainer, true);
// Check to see if a request is already in-flight.
BatchedImageRequest request = mInFlightRequests.get(cacheKey);
if (request != null) {
// If it is, add this request to the list of listeners.
request.addContainer(imageContainer);
return imageContainer;
}
// The request is not already in flight. Send the new request to the network and
// track it.
Request<Bitmap> newRequest = makeImageRequest(requestUrl, maxWidth, maxHeight, scaleType,
cacheKey);
mRequestQueue.add(newRequest);
mInFlightRequests.put(cacheKey,
new BatchedImageRequest(newRequest, imageContainer));
return imageContainer;
}
希望对你有帮助!
关于android - 禁用或删除 NetworkImageView-Volley 中的缓存,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34755109/