I am using picasso library for loading images .In default picasso, It uses internal cache memory for loading images.But as per my app configuration ,i have to use external cache memory(Cache on Disk).
so i used this code for Cache on Disk
File httpCacheDir = new File(getApplicationContext().getExternalCacheDir(),"http");
long httpCacheSize = 10 * 1024 * 1024; // 10 MiB
HttpResponseCache.install(httpCacheDir, httpCacheSize);}
Picasso is flexible. So now it caches images in external Sd card..
The caches is stored in sdcard/android/data/packagename/cache/http
The caches are stored in ".1" ,".0". formats
so i just opened them and changes into ".1" to ".jpg".it gives exact images what i need.
But how to do in programatically? but picasso itself caches my memory in to my app for loading image into imageview.but i have to save them into sdcard directly as images/set bitmap as wallpaper in offline mode?
You can supply your own Cache implementation when building your Picasso instance. This way you can provide extra methods that you can call to retrieve bitmaps directly from your memory cache. Use Picasso.Builder to provide your own implementation for it. When you use with() you are using a static singleton internal instance thats setup with most of the default values (most apps need the default values anyway.)
Keep a reference of your Cache implementation around and directly interact with it. Picasso is meant to handle the loading/decoding and caching for you but there is no reason you cant build around it.
If you are referring about the disk cache, then no Picasso does not support that at the moment. This is by design because the disk layer cache is done by the HTTP layer and makes no distinction about it.
You could however, change the path of the disk cache. If you are using OkHttpDownloader then supply a different file when you construct your Downloader. Similarly for UrlConnectionDownloader you could extend it and override the load() method.
Picasso does handle the caching in it and downloading also you just need to place it in your target Image view similar to Aquery
According to The Corner Square Engineering blog
picasso handle downloading caching in it self and give its handler to user to use it and place the image in image view
Related
I have a scenario where i have to keep few images in offline mode. Now i am confused here that should i rely on Glide's cache or I have to put those images in Internal Storage?
Hopefully Glide will work, but need to know if there exists any limitation if i go with Glide. Here word cache is causing confusion.
Here is the information about underlying memory usage by Glide.
Glide uses DiskLruCacheWrapper as the default DiskCache. DiskLruCacheWrapper is a fixed size disk cache with LRU eviction. The default disk cache size is 250 MB and is placed in a specific directory in the Application’s cache folder.
Further underlying complexities of Glide are here. Hope confusion about the max memory Glide uses is cleared here and if customization is needed, that can also be achieved by following the link mentioned.
I'm using Picasso to initially download images of products to my app from a server. Since the images aren't changing nearly at all for a certain product, I save the images to the disk from the ImageView. In the app I have to display these images all over again in different sizes. To do so I'm using Picasso again, loading the saved file into an ImageView and do fit().centercrop() so I don't get any OutofMemory issues.
Since Picasso is also capable of using OkHttp's cache and doing the caching by its own, I want to know:
Are there any advantages about letting Picasso do the caching, over saving it to storage manually and handing it over again to Picasso later?
And would it be a good way to store the shrinked image (after using .fit()) as a new file so the calculation hasn't to be done all the time.
I implemented a routine which saves data from a json into database and after that if user gets offline, he can see all data. but picasso doesn't load the images after the first run. but when i run the application twice in online mode, after that picasso can load the images from cache in offline mode.
(it should cache images on the first run but it's not working)
appreciate any suggestion
https://stackoverflow.com/a/23281195/3664628
Picasso doesn't have a disk cache. It delegates to whatever HTTP client you are using for that functionality (relying on HTTP cache semantics for cache control). Because of this, the behavior you seek comes for free...
The main reason may be other images are evicting the older ones from the cache due to their size. You can load smaller versions or increase the size of the memory cache like this
Picasso p = new Picasso.Builder(context)
.memoryCache(new LruCache(Size))
.build();
If you don't want to save in cache, You can Additionally exclude that too using Memory Policy.
Picasso attempts to get the requested image from the memory first. If you would like Picasso to skip this step, you can call memoryPolicy(MemoryPolicy policy, MemoryPolicy... additional) on your Picasso request creator. MemoryPolicy is a simple enum with two values: NO_CACHE and NO_STORE. like this
Picasso
.with(context)
.load(UsageExampleListViewAdapter.eatFoodyImages[1])
.memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE)
.into(imageViewFromDisk);
Additional Source : futurestud.io
I have activity in which there is a dialog window with some images. I want to download these images into cache when my activity starts and load them from cache when dialog window appears.
My activity code:
for(int i=0; i<avataritemlist.size();i++){
Picasso.with(activity_context)
.load(item.getpath())
.noFade();
}
Dialog adapter code:
Picasso.with(mContext)
.load(item.getpath())
.noFade()
.into(holder.imageView);
I expect to cache the image in my activty and then in dialog adapter load in from cache, but in my case it downloads it again in adapter. I want to emphasize that activity_context and mContext is the same. What am I doing wrong?
Default Picasso instance returned by Picasso.with uses an automatic memory and disk caching. It is initialized with default values:
• LRU memory cache of 15% the available application RAM
• Disk cache of 2% storage space up to 50MB but no less than 5MB. (Note: this is only available on API 14+ or if you are using a standalone library that provides a disk cache on all API levels like OkHttp)
• Three download threads for disk and network access.
How default Picasso instance does LRU memory cache is something you might not be able to know, all you know is it is a memory cache which uses a least-recently used eviction policy.
However you can create a Picasso instance using Picasso.Builder that gives you a better control over image caching (over disk). Check more on this stackoverflow post on how to set up http request header property Cache-Control with max-age and Jake Wharton's answer too
Also you may also want to try out Glide which syntactically is very similar to Picasso
I need to download image url and store it in cache as bitmap.My qus is is there any config that i have to do inorder to store the image bitmaps in cache..? Is there any need to create any cache file?
You should try this librairy : https://github.com/square/pollexor
Well, you just can put it in the app's cache (context.getCacheDir()). What I'd recommend is to use wasp: a cool Android library to handle Bitmaps safely (safe == avoid OutOfMemory exceptions which are pretty common), based on a LRU cache.
It also allows you to download images in the background and get a callback once your image is downloaded... or automatically set the image to an ImageView once it gets downloaded. It is open-source, and is available for Maven users too.
Disclaimer: I'm one of the developers working on wasp library.
Depending on how many images you want to cache, you can probably get away with an in-memory cache using a LruCache. I'd cache the downloaded byte array, not the Bitmap, because Bitmaps are Big Things and decoding byte array -> Bitmap is pretty fast.