Remove image from cache in Glide library - android

I am using Glide in one of my projects to show image from file.
Below is my code how I am showing the image:
Glide.with(DemoActivity.this)
.load(Uri.parse("file://" + imagePath))
.into(mImage);
The image at this location(imagePath) keeps on changing. By default Glide cache the image it shows in the ImageView. Because of this, the Glide was showing the first image from cache for new images at that location.
If I change the image at location imagePath with some other image having same name then the Glide is showing the first image instead of new one.
Two queries are:
Is it possible to always the image from File and not cache? This way problem will be solved.
Is it possible to clear image from cache before getting newly replaced image? This will also solve the problem.

This is how I solved this problem.
Method 1: When the URL changes whenever image changes
Glide.with(DemoActivity.this)
.load(Uri.parse("file://" + imagePath))
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.into(mImage);
diskCacheStrategy() can be used to handle the disk cache and you can skip the memory cache using skipMemoryCache() method.
Method 2: When URL doesn't change, however, image changes
If your URL remains constant then you need to use Signature for image cache.
Glide.with(yourFragment)
.load(yourFileDataModel)
.signature(new StringSignature(yourVersionMetadata))
.into(yourImageView);
Glide signature() offers you the capability to mix additional data with the cache key.
You can use MediaStoreSignature if you are fetching content from media store. MediaStoreSignature allows you to mix the date modified time, mime type, and orientation of a media store item into the cache key. These three attributes reliably catch edits and updates allowing you to cache media store thumbs.
You may StringSignature as well for content saved as Files to mix the file date modified time.

As explained in the section Caching and Cache Invalidation of the Glide wiki:
Because File names are hashed keys, there is no good way to simply
delete all of the cached files on disk that correspond to a particular
url or file path. The problem would be simpler if you were only ever
allowed to load or cache the original image, but since Glide also
caches thumbnails and provides various transformations, each of which
will result in a new File in the cache, tracking down and deleting
every cached version of an image is difficult.
In practice, the best way to invalidate a cache file is to change your >identifier when the content changes (url, uri, file path etc).
Since you can't change the file path, Glide offers the signature() API that allows you sets some additional data to be mixed in to the memory and disk cache keys allowing the caller more control over when cached data is invalidated.
If you want to reload every time the image from the disk, you can change your code like this:
Glide.with(DemoActivity.this)
.load(Uri.parse("file://" + imagePath))
.signature(new StringSignature(String.valueOf(System.currentTimeMillis())))
.into(mImage);

There are two ways to handle Glide cache refresh,
Firstway: - Add below with glide implementation
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
Second way:
If you able to identify image changes then give your new file name in below,
.signature(new StringSignature(String.valueOf(fileName)))
or you want to load every time with latest images , use below
.signature(new StringSignature(String.valueOf(System.currentTimeMillis())))
Hope this helps.

This will remove cache memory which is stored by Glide.And it should be done in background otherwise it will throw exception
new Thread(new Runnable() {
#Override
public void run() {
Glide.get(MainActivity.this).clearDiskCache();
}
}).start();

Had troubles with Glide 4.2.0, StringSignature was not resolved.
Looks like StringSignature is not available anymore and you have to use ObjectKey instead.
So code looks like
Glide.with(imageView).
load(pathToImage).
apply(new RequestOptions().signature(new ObjectKey("signature string"))).
into(imageView);

If you save images to the same known filename as a convention and want to invalidate the Glide cache only when the file has changed, using the file modification timestamp can work well.
I was using such a convention for avatar images which I was downloading to File objects outside Glide, and then using Glide just to efficiently resize and make them round, etc.
So I ended up using the StringSignature strategy with the value of the file's lastChanged timestamp as the signature. Here's what the fluent code for that looks like:
Glide.with(this)
.load(avatarFile)
.diskCacheStrategy(DiskCacheStrategy.RESULT)
.signature(new StringSignature(String.valueOf(avatarFile.lastModified())))
.into(ivProfile);
}
where avatarFile is my java.io.File object, of course.

I had troubles with setting signature using Glide version 4.* with Kotlin.
After some time I ended up with this:
fun ImageView.loadUrl(url: String) {
var requestOptions = RequestOptions()
requestOptions.signature(ObjectKey(System.currentTimeMillis()))
Glide.with(this).load(url).apply(requestOptions).into(this)
}
It's an extension function for ImageView, and it's used this way:
imageView.loadUrl(url)
I Hope it will help someone

For Glide 4.3.+ library you need to something like this to ,
Glide.with(context)
.load(image_path)
.apply(new RequestOptions()
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true))
.into(imge_view);

In the latest versions we should use RequestOptions
RequestOptions Provides type independent options to customize loads with Glide in the latest versions of Glide.
Make a RequestOptions Object and use it when we are loading the image.
RequestOptions requestOptions = new RequestOptions()
.diskCacheStrategy(DiskCacheStrategy.NONE) // because file name is always same
.skipMemoryCache(true);
Glide.with(this)
.load(photoUrl)
.apply(requestOptions)
.into(profile_image);

I was using Glide to load a File, and here's what I ended up doing to make sure Glide's disk cache was invalidated every time my file changed (even though it had the same path):
Glide.with(context)
.load(bitmapFile)
.signature(new ObjectKey(bitmapFile.lastModified()))
.into(imageView);

I worked on this for days, and all the above-mentioned solutions are just slow as a sloth.
I know you've probably read this before and ignored it because you thought it would probably take a lot of work to change your code. But seriously, it's well worth it. The performance, as far as I can tell, beats all the other methods presented, it's Glide's recommended solution, AND you don't need to skip cache or create signatures so it keeps your code cleaner too.
FROM Glide:
In practice, the best way to invalidate a cache file is to change your
identifier when the content changes (url, uri, file path etc) when
possible. - https://bumptech.github.io/glide/doc/caching.html
SOLUTION:
Change the name of the image when the user uploads a new image. Get the file name and use that for example. Once the image URL has changed, Glide understands you have changed the image and will update the Cache accordingly. This has by far given me the best performance.
WHEN USING:
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
It never caches the images and this really makes images load slowly. You'd think Signatures are better for performance, but to me they seemed just as slow.

signature with GlideApp
GlideApp.with(imageView)
.load(url)
.signature(new ObjectKey(System.currentTimeMillis()))
.placeholder(R.drawable.sky)
.error(R.drawable.sky)
.into(imageView);

And finally Kotlin implementation (For Fragments):
Glide.with(activity)
.load(url)
.apply(RequestOptions()
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true))
.into(myImageView)

This worked for me
//use diskCacheStrategy(DiskCacheStrategy.NONE) after skipMemoryCache(true)
Glide.with(this)
.load(image)
.skipMemoryCache(true)
.diskCacheStrategy(DiskCacheStrategy.NONE)
.into(imageview);

Programmatically simply you can use:
// must run on main thread
Glide.get(getApplicationContext()).clearMemory();
// must run in background thread
Glide.get(getApplicationContext()).clearDiskCache();
For More

This one worked for me!
Glide.with(DemoActivity.this)
.load(Uri.parse("file://" + imagePath))
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.into(mImage);

To benefit from the cache provided by Glide and ensure that the correct image is shown everytime, you can use the signature() API.
All you have to do is to set as signature an information that relates to the image file. When you replace that file, the information changes too and Glide knows it must reload it, ignoring the cache.
A valid information could be a digest (for example SHA-1) calculated on the file contents.
Glide.with(context)
.load(inputFile)
.signature(new StringSignature(sha1(inputFile)))
.into(targetImageView);
Here I found the following implementation of sha1() function:
public static String sha1(final File file) throws NoSuchAlgorithmException, IOException {
final MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
try (InputStream is = new BufferedInputStream(new FileInputStream(file)) {
final byte[] buffer = new byte[1024];
for (int read = 0; (read = is.read(buffer)) != -1;) {
messageDigest.update(buffer, 0, read);
}
}
// Convert the byte to hex format
try (Formatter formatter = new Formatter()) {
for (final byte b : messageDigest.digest()) {
formatter.format("%02x", b);
}
return formatter.toString();
}
}

1) First clear disk cache.
private class ClearGlideCacheAsyncTask extends AsyncTask<Void, Void, Boolean>{
private boolean result;
#Override
protected Boolean doInBackground(Void... params) {
try {
Glide.get(getContext()).clearDiskCache();
result = true;
}
catch (Exception e){
}
return result;
}
#Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
if(result)
Toast.makeText(getActivity(), "cache deleted", Toast.LENGTH_SHORT).show();
}
}
You can call from your ui with new ClearGlideCacheAsyncTask ().execute();
2) Clear memory cache
// This method must be called on the main thread.
Glide.get(context).clearMemory();
Source : https://bumptech.github.io/glide/doc/caching.html

you can use a time stamp, that time could be the file's date modified or System.currentTimeMillis()
this works perfectly
Glide.with(DemoActivity.this)
.load(Uri.parse("file://" + imagePath+"?time="+System.currentTimeMillis()))
.into(mImage);

Related

Display multiple image with Glide

I want to display one image into two different image views using glide.I know that i can simply use the code below to do it.
ImageView imageView = findViewById(R.id.header_image);
Glide.with(this).load(R.drawable.header_image).into(imageView);
ImageView imageView2 = findViewById(R.id.header_image);
Glide.with(this).load(R.drawable.header_image).into(imageView2);
But it requires to load the same image twice into memory and i don't want that due to memory issues.I want to load the image once and diaplay it into two image views.What can i do to achieve it?
You no need to worry about memory issue while using glide because glide has own caching system to optimize memory pls read this doc
Glide provides a number of options that allow you to choose how loads will interact with Glide’s caches on a per request basis.
Disk Cache Strategies
DiskCacheStrategy can be applied with the diskCacheStrategy method to an individual request. The available strategies allow you to prevent your load from using or writing to the disk cache or choose to cache only the unmodified original data backing your load, only the transformed thumbnail produced by your load, or both.
The default strategy, AUTOMATIC, tries to use the optimal strategy for local and remote images. AUTOMATIC will store only the unmodified data backing your load when you’re loading remote data (like from URLs) because downloading remote data is expensive compared to resizing data already on disk. For local data AUTOMATIC will store the transformed thumbnail only because retrieving the original data is cheap if you need to generate a second thumbnail size or type.
To apply a DiskCacheStrategy:
GlideApp.with(fragment)
.load(url)
.diskCacheStrategy(DiskCacheStrategy.ALL)
.into(imageView);
Loading only from cache
In some circumstances you may want a load to fail if an image is not already in cache. To do so, you can use the onlyRetrieveFromCache method on a per request basis:
GlideApp.with(fragment)
.load(url)
.onlyRetrieveFromCache(true)
.into(imageView);
If the image is found in the memory cache or in the disk cache, it will be loaded. Otherwise, if this option is set to true, the load will fail.
You can use following code to load an image once and display it in multiple imageviews.
Glide.with(this)
.asBitmap()
.load(R.drawable.header_image)
.into(new SimpleTarget<Bitmap>() {
#Override
public void onResourceReady(#NonNull Bitmap resource, #Nullable Transition<? super Bitmap> transition) {
imageview.setImageBitmap(resource);
imageview2.setImageBitmap(resource);
}
});
If you are using latest version of Glide then create RequestOptions like
private RequestOptions simpleOptions = new RequestOptions()
.centerCrop()
.placeholder(R.color.color_gray)
.error(R.color.color_gray)
.diskCacheStrategy(DiskCacheStrategy.RESOURCE);
Use RequestOptions to load image with set properties
Glide.with(context)
.load(url)
.apply(simpleOptions)
.into(imageView);
Or maybe this way…
RequestBuilder<Drawable> builder = Glide.with(this).load(drawableResId);
builder.into(imageView0)
builder.into(imageView1)
try this way ...
setImage(R.drawable.header_image,imageView ,imageView2 );
void setImage(int image, ImageView... imageView) {
for (ImageView imageView : imageView) {
if (imageView != null) {
Glide.with(this).load(image).into(imageView);
}
}
}

Glide v4.4 disable memory cache and disk cache failure

The image file is downloaded from the server and always save to the same file name.
So in earlier version of glide, i have been tested with
Uri uri = Uri.fromFile(new File(downloadPath));
GlideApp.with(this)
.load(uri)
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.into(mDownloadImageView);
It seems work for the file with the same name when its image changes. The offical document Glide Caching mentioned like above.
But now in Glide 4.4.0, i used this code again and it is not working. I need to add the signature like below:
Uri uri = Uri.fromFile(new File(downloadPath));
GlideApp.with(this)
.load(uri)
.signature(new ObjectKey(System.currentTimeMillis()))
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.into(mDownloadImageView);
After adding the signature key, then it works.
Does anyone met the same scenario? DiskcacheStrategy None and skip memory cache true as no effect at all to me.
You have to use the RequestOptions now.
Glide.with(this).load(imageResource)
.apply(RequestOptions()
.placeholder(R.drawable.ic_no_profile_image)
.centerCrop()
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.dontAnimate())
.into(profileImageView)
Yes, I have the same problem.
I have to use signature with diskCacheStrategy() set to NONE and skipMemoryCache() set to true if I want to refresh image every time.
Another problem is that if I use diskCacheStrategy() set to ALL with some signature (in order to force cache refresh on some occasions) - it is not working. Signature is changing every time but Glide always loads image from cache and doesn't want to refresh it.
It was working great on Glide v3 and stopped working correctly after upgrading to v4.

Tell Glide not to load images if set in preferences

I have several RecyclerView's inside my app, and all of them have items which have an ImageView, which are further populated with Glide, like this:
Glide.with(context)
.load(imageUrl)
.asBitmap()
.error(R.drawable.placeholder_avatar)
.centerCrop()
.into(mAvatarImageView);
In my Preference screen, users can disable loading of all remote images to save bandwidth.
What's the best way to tell Glide not to load images, without using a classic if-else conditions inside all RecyclerView adapters, which violates the DRY principle?
I'm looking for a method like this:
.shouldLoad(UserSettings.getInstance().isImageLoadingEnabled());
Assuming you are using Glide v4, there is a request option specifically designed for this purpose: RequestOptions.onlyRetrieveFromCache(boolean flag). When enabled, only resources already present in memory or disk cache are loaded, effectively preventing loads from the network and saving bandwidth.
If you use Glide v4 Generated API, this option is directly available on the GlideRequest returned by GlideApp.with(context).asBitmap().
Otherwise, you have to create a RequestOptions with this flag enabled and apply it :
RequestOptions options = new RequestOptions().onlyRetrieveFromCache(true);
Glide.with(context).asBitmap()
.apply(options)
.error(R.drawable.placeholder_avatar)
.centerCrop()
.into(mAvatarImageView);
If you will decide to use Kotlin you can create needed extension function:
fun <T> RequestBuilder<T>.shouldLoad(neededToLoad : Boolean) : RequestBuilder<T> {
if(!neededToLoad) {
return this.load("") // If not needed to load - remove image source
}
return this // Continue without changes
}
Then you can use it, as you describe in question:
Glide.with(context)
.load(imageUrl)
.shouldLoad(false)
.into(imageView)
It's fair to say, that you can create only one Kotlin file with shouldLoad() function and use it in Java, but code becomes ugly:
shouldLoad(Glide.with(this)
.load(imageUrl), false)
.into(imageView);
OR
RequestBuilder<Drawable> requestBuilder = Glide.with(this)
.load(imageUrl);
requestBuilder = shouldLoad(requestBuilder, true);
requestBuilder.into(imageView);

Android - use picasso to load image without storing it in cache

I want to use picasso to load an image from a url into a placeholder, but not store that image in cache - in other words, I want the image to be downloaded from the net directly to disk and then loaded from disk when needed. I understand there's a class called RequestCreator where you can specify memory policy - does anyone have an example of using picasso/requestcreator to do something like this?
So.. something like:
RequestCreator requestCreator = new RequestCreator();
requestCreator.memoryPolicy(MemoryPolicy.NO_CACHE);
....
merged with:
Picasso.with(context).load(someurl).fit().placeholder(someplaceholder).into(sometarget)..
Picasso supports this by it's skipMemoryCache() in the Picasso builder. An example is shown below.
Picasso.with(context).load(imageUrl)
.error(R.drawable.error)
.placeholder(R.drawable.placeholder)
.skipMemoryCache()
.into(imageView);
With the new API you should use it like this so that it skips looking for it and storing it in the cache:
Picasso.with(context).load(imageUrl)
.error(R.drawable.error)
.placeholder(R.drawable.placeholder)
.memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE)
.into(imageView);
NO_CACHE
Skips memory cache lookup when processing a request.
NO_STORE
Skips storing the final result into memory cache. Useful for one-off requests to avoid evicting other bitmaps from the cache.
For picasso:2.71828 or above version use the following for skipping using disk cache networkPolicy(NetworkPolicy.NO_CACHE) :
Picasso.get()
.load(camera_url)
.placeholder(R.drawable.loader2)
.networkPolicy(NetworkPolicy.NO_CACHE, NetworkPolicy.NO_STORE)
.into(img_cam_view);
Picasso 2.5.0
If you are using Picasso to load image from Internet, you have to use NetworkPolicy attribute.
.networkPolicy(NetworkPolicy.NO_STORE)
but live memory cache (Not disk cache) is useful, you might want to keep it.
just append this at the end of url.
"?=" + System.currentTimeMillis();

Invalidate cache in Picasso

I load an image from disk using Picasso, e.g., Picasso.with(ctx).load(new File("/path/to/image")).into(imageView), but whenever I save a new image in that file, and refresh my ImageView, Picasso still has the bitmap cached.
Is it possible to invalidate the cache in Picasso?
In the recent versions of Picasso, there is a new method for invalidate, without any workarounds, so I think that custom PicassoTools class mentioned earlier, is now obsolete in this case
Picasso.with(getActivity()).invalidate(file);
Actually, based on your own answer, there is an easier way to do it without forking the library. Add this class to the com.squareup.picasso package.
package com.squareup.picasso;
public class PicassoTools {
public static void clearCache (Picasso p) {
p.cache.clear();
}
}
Because cache has package visibility, this util class can clear the cache for you. You just have to call it:
PicassoTools.clearCache(Picasso.with(context));
Abort memory cache and disk cache check by indicate memory policy by flag: emoryPolicy.NO_CACHE and NetworkPolicy.NO_CACHE as below code snippet:
mPicasso.with(mContext)
.load(url)
.memoryPolicy(MemoryPolicy.NO_CACHE )
.networkPolicy(NetworkPolicy.NO_CACHE)
.resize(512, 512)
.error(R.drawable.login)
.noFade()
.into(imageView);
Try to use:
Picasso.with(ctx).load(new File("/path/to/image")).skipMemoryCache().into(imageView)
The order of search image in Picasso is:
Memory cache -> Disk cache -> Network
So there are few scenario we need to invalidate cache in Picasso:
1.Invalidate memory cache:
Usercase: When image already update in disk cache or remote host
Solution: Clear cache of Url, File, Uri if exist
mPicasso.with(appContext).invalidate(File);
mPicasso.with(appContext).invalidate(Url);
mPicasso.with(appContext).invalidate(Uri);
.
2.Invalidate memory cache and disk cache Online
※note: Online mean update directly to ImageView
User case: Image updated on remote host
Solution: Abort image on memory cache and disk cache then request image on remote host
mPicasso.with(appContext)
.load(url)
.memoryPolicy(MemoryPolicy.NO_CACHE )
.networkPolicy(NetworkPolicy.NO_CACHE)
.into(imageView);
-> Abort memory cache and disk cache
.
3.Invalidate memory cache and disk cache Offline
※ note: Offline mean update not update to ImageView, just background fetch to using later
User case: You know image on remote host updated, but only want to update cache only to using afterward (not update into image view)
Solution: fetch only
mPicasso.with(appContext)
.load(url)
.memoryPolicy(MemoryPolicy.NO_CACHE)
.networkPolicy(NetworkPolicy.NO_CACHE)
.fetch();
※Note: Using fetch() is good but it also consume network resource, so please consider carefully, check scenario 4 in below for better solution
4.Invalidate memory cache and disk cache Offline if disk cache is exist
User case: Only invalidate cache if already exist in disk cache
Solution: Should check disk by using parameter: NetworkPolicy.OFFLINE cache before fetch
mPicasso.with(appContext)
.load(url)
.memoryPolicy(MemoryPolicy.NO_CACHE)
.networkPolicy(NetworkPolicy.OFFLINE)
.fetch(new Callback() {
#Override
public void onSuccess() {
//Success: mean disk cache exist -> should do actual fetch
picasso.load(url).fetch();
}
#Override
public void onError() {
//Failed: mean disk cache not exist
}
});
Picasso is an amazing libs, I hope squareup will add more convenience API to manage cache in upcoming future.
Another option is to delete the cache directory itself, for example on app startup:
deleteDirectoryTree(context.getCacheDir());
where:
/**
* Deletes a directory tree recursively.
*/
public static void deleteDirectoryTree(File fileOrDirectory) {
if (fileOrDirectory.isDirectory()) {
for (File child : fileOrDirectory.listFiles()) {
deleteDirectoryTree(child);
}
}
fileOrDirectory.delete();
}
That deletes the whole cache directory, which is fine if you want to simulate first-use of your app. If you only want to delete the Picasso cache, add "picasso-cache" to the path.
What you can do if you want to delete all cache at once, is to create a custom Picasso.LruCache, and then use the clear method on it.
Here is a sample:
Picasso.Builder builder = new Picasso.Builder(this);
LruCache picassoCache = new LruCache(this);
builder.memoryCache(picassoCache);
Picasso.setSingletonInstance(builder.build());
To clear the cache:
picassoCache.clear();
You can clear image cache of picasso by setting your own cache and clear that.
This code was tested on Picasso 2.5.0
private Picasso picasso;
private LruCache picassoLruCache;
picassoLruCache = new LruCache(context);
// Set cache
picasso = new Picasso.Builder(context) //
.memoryCache(picassoLruCache) //
.build();
// Clear cache
picassoLruCache.clear();
Doesn't loop pretty, but this approach fixed my issue with cache and Picasso. Only use this when you want to invalidate the cache for a specific URL, this approach is slow and probably is not the correct way of doing but works for me.
String url = "http://www.blablabla.com/Raiders.jpg";
Picasso.with(this).invalidate(url);
Picasso.with(this)
.load(url)
.networkPolicy(
NetworkUtils.isConnected(this) ?
NetworkPolicy.NO_CACHE : NetworkPolicy.OFFLINE)
.resize(200, 200)
.centerCrop()
.placeholder(R.mipmap.ic_avatar)
.error(R.mipmap.ic_avatar)
.into(imageView);
A very important part is missing from the accepted answer here. I found the trick from here: http://blogs.candoerz.com/question/124660/android-image-cache-is-not-clearing-in-picasso.aspx
Just calling the following line, wouldn't clear the cache of a photo when you use custom options like resize, center crop etc when displaying the original image.
Picasso.with(getContext()).invalidate(file);
The solution:
When displaying the image, use stableKey() method.
Picasso.with(getContext()).load(new File(fileUri))
.skipMemoryCache()
.placeholder(R.drawable.placeholder)
.stableKey(fileUri)
.into(imageview);
Then, you can clear the cache of this file later by calling this:
Picasso.with(getContext()).invalidate(fileUri);
Hope this will help.
You can skip memory cache by skipMemoryCache()
see the following
Picasso.with(this)
.load(IMAGE_URL)
.skipMemoryCache()
.placeholder(R.drawable.placeholder)
.error(R.drawable.no_image)
.into(mImageViewPicasso);
gradle compile "com.squareup.picasso:picasso:2.4.0"
Another option is to save the new image into a different file than the original. Since the Picasso bitmap cache is keyed off of the file path, loading the new image from a different file will result in a cache miss. This also has the side benefit of not having to clear the entire cache.
use shutdown() instead
As per source code; shutdown will stop accepting further request as well as clear all cache
/** Stops this instance from accepting further requests. */
public void shutdown() {
if (this == singleton) {
throw new UnsupportedOperationException("Default singleton instance cannot be shutdown.");
}
if (shutdown) {
return;
}
cache.clear();
cleanupThread.shutdown();
stats.shutdown();
dispatcher.shutdown();
for (DeferredRequestCreator deferredRequestCreator : targetToDeferredRequestCreator.values()) {
deferredRequestCreator.cancel();
}
targetToDeferredRequestCreator.clear();
shutdown = true;
}
Also you can not shutdown singleton instance.
So you need to have instance variable for Picasso. Do not forget to reinitialize picasso instance everytime you shutdown() it in order to reuse it
File f = new File(path, name);
Picasso.with(this).invalidate(Uri.fromFile(f));

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