is it possible to download images from cache memory in picasso?

Question

I was using UniversalImageDownloader for my app.in UIL we can save images from cache memory.

 File cachedImage = ImageLoader.getInstance().getDiscCache().get(imageUrl);
            if (cachedImage.exists())
            {// code for save 2 sd
                           }

Is it possible in picasso?

@AndroSelva what can i do .this question is not clear.thats only i gave the exact details in another question. — Asthme, Aug 28 '13 at 10:44
I completely understand that. But you are still missing a point. You don't say why you exactly need to get the image from cache!! why? — Andro Selva, Aug 28 '13 at 10:45
I get your question.. But there are lot many ways to do it. and unfortunately the solution is a little lengthy and I am afraid your question will receive much attention since it will need someone who can work on your problem.. — Andro Selva, Aug 28 '13 at 10:52
Hi, I am having some problem with jar I downloaded for Picasso. If you have your sample can you send it across to my mail? Will that be a problem? — Andro Selva, Aug 28 '13 at 12:17
@AndroSelva [Try this](https://twitter.com/dnkoutso/status/369987447834173440) — Asthme, Aug 28 '13 at 13:36
I'm doing something similar HERE!!!http://stackoverflow.com/questions/18808114/picasso-loading-of-image-spawned-inside-asynctask — Etienne Lawlor, Sep 15 '13 at 02:01
You should really be careful when doing this, if you hold a reference to images in the cache you prevent those images from being garbage collected once they are evicted from the cache. This can cause `OutOfMemoryExceptions` and other errors. — Xaver Kapeller, May 15 '15 at 11:20

score 1 · Answer 1 · answered Aug 29 '13 at 10:33

1

There is a private Method in Picasso -

Bitmap quickMemoryCacheCheck(String key) {
    Bitmap cached = cache.get(key);
    if (cached != null) {
      stats.dispatchCacheHit();
    } else {
      stats.dispatchCacheMiss();
    }
    return cached;
  }

Modify the source according to your need.

answered Aug 29 '13 at 10:33

Mihir

2,064
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Cache cache ; StatsSnapshot stats; i declared this variable in my activity is that ok? – Asthme Aug 29 '13 at 10:40
`quickMemoryCacheCheck` is a private Method of `Picasso.class`. You have to pull the source from `GIT` and modify the source code. – Mihir Aug 29 '13 at 11:02
Ok but how to get the key value? – Asthme Aug 29 '13 at 11:30
@yea in picasso class i have seen stats and cache class to pull.but how to get the key value ? – Asthme Aug 29 '13 at 11:40

score 1 · Answer 2 · answered May 23 '15 at 14:11

You can do like this , Use OkHttp & Picasso:

public class APP extends Application{
  public static OkHttpDownloader okHttpDownloader;

  @Override
  public void onCreate() {
    super.onCreate();
    Picasso.Builder b = new Picasso.Builder(this);
    okHttpDownloader = new OkHttpDownloader(this);
    b.downloader(okHttpDownloader);
    Picasso.setSingletonInstance(b.build());
 }
}

Then get the File from OkHttp local cache:

Downloader.Response res = APP.okHttpDownloader.load(Uri.parse(your image Url),0);
Log.i(TAG,"Get From DISK: " + res.isCached() );
storeImageFile(res.getInputStream());

Why does it have to extend application and can you expand on the method storeImageFile, include the code? — Lion789, Jul 10 '15 at 16:50

score 0 · Answer 3 · answered May 15 '15 at 11:14

You can get bitmap from ImangeView onSuccess() callback

Picasso.with(context).load(path).into(imageView, new Callback(){
    public void onSuccess() {
      Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
      //save bitmap to sdcard
   } 
   public void onError() {}
}

WARNING: Saved bitmap may be different to original bitmap.

Hitesh Sahu · Answer 4 · 2017-01-31T12:12:49.950

Below code snippet will first make Picasso load image from cache, if failed then download and display image in imageView

You can debug memory performance with

Picasso.with(appContext).setIndicatorsEnabled(true);

green (memory, best performance)
blue (disk, good performance)

red (network, worst performance).

     //Debugging memory performance https://futurestud.io/tutorials/picasso-cache-indicators-logging-stats
    //TODO remove on deployment
    Picasso.with(appContext).setIndicatorsEnabled(true);

    //Try to load image from cache
    Picasso.with(appContext)
            .load(imageUrl)
            .networkPolicy(NetworkPolicy.OFFLINE).placeholder(R.drawable.ic_launcher)
            .placeholder(R.drawable.ic_launcher)
            .resize(100, 100)
            .error(R.drawable.ic_drawer)
            .into(markerImageView, new Callback() {
                @Override
                public void onSuccess() {

                }

                @Override
                public void onError() {

                    // Try online if cache failed
                    Picasso.with(appContext)
                            .load(imageUrl)
                            .placeholder(R.drawable.ic_launcher)
                            .resize(100, 100)
                            .error(R.drawable.ic_drawer)
                            .into(markerImageView);
                }
            });

is it possible to download images from cache memory in picasso?

4 Answers4