[英]Android - How to get image file from Fresco disk cache?
if the image have download in cache,you can do it like: 如果图像已在缓存中下载,您可以这样做:
ImageRequest imageRequest=ImageRequest.fromUri(url);
CacheKey cacheKey=DefaultCacheKeyFactory.getInstance()
.getEncodedCacheKey(imageRequest);
BinaryResource resource = ImagePipelineFactory.getInstance()
.getMainDiskStorageCache().getResource(cacheKey);
File file=((FileBinaryResource)resource).getFile();
I hope this helps 我希望这有帮助
Check Plamenkos answer on this link.. https://github.com/facebook/fresco/issues/80 检查Plamenkos在此链接上的答案.. https://github.com/facebook/fresco/issues/80
if you ask pipeline for an encoded image, and specify DISK_CACHE with ImageRequestBuilder.setLowestPermittedRequestLevel, the pipeline will return you the JPEG bytes if the image is found anywhere up to disk cache, or null if the image is not found and a full-fetch would have to be performed. 如果您要求管道获取编码图像,并使用ImageRequestBuilder.setLowestPermittedRequestLevel指定DISK_CACHE,则管道将返回JPEG字节(如果在磁盘缓存中找到图像),如果找不到图像则为null,并且完全取出必须要执行。
I hope I did not mis-understand your question and provide a wrong answer. 我希望我没有误解你的问题并提供错误的答案。
ImageRequest request = ImageRequestBuilder.newBuilderWithSource(Uri.parse(YourImageUrl))
.setLowestPermittedRequestLevel(ImageRequest.RequestLevel.DISK_CACHE)
.setResizeOptions(new ResizeOptions(width, width))
.build();
DraweeController controller = Fresco.newDraweeControllerBuilder()
.setOldController(YourImageView.getController())
.setImageRequest(request)
.build();
This code: 这段代码:
.setLowestPermittedRequestLevel(ImageRequest.RequestLevel.DISK_CACHE)
will make fresco get your image from the disk first and then the net. 将使壁画首先从磁盘获取您的图像,然后从网络。
I think you should never try to get Fresco Cache name cause cache is the internal implement. 我认为你永远不应该试图获得Fresco Cache名称因为缓存是内部工具。
But if you want to know whether a image has been cached, you can use this: 但是,如果您想知道图像是否已被缓存,您可以使用:
private boolean isDownloaded(Uri loadUri) {
if (loadUri == null) {
return false;
}
ImageRequest imageRequest = ImageRequest.fromUri(loadUri);
CacheKey cacheKey = DefaultCacheKeyFactory.getInstance()
.getEncodedCacheKey(imageRequest);
return ImagePipelineFactory.getInstance()
.getMainDiskStorageCache().hasKey(cacheKey);
}
this method is return very fast, you can use it in UI thread. 这个方法返回的速度非常快,你可以在UI线程中使用它。
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