How do I use disk caching in Picasso?

Question

I am using Picasso to display image in my android app:

/**
* load image.This is within a activity so this context is activity
*/
public void loadImage (){
           


        

Answer 1

I don't know how good that solution is but it is definitely THE EASY ONE i just used in my app and it is working fine

you load the image like that

public void loadImage (){
Picasso picasso = Picasso.get(); 
picasso.setIndicatorsEnabled(true);
picasso.load(quiz.getImageUrl()).into(quizImage);
}

You can get the bimap like that

Bitmap bitmap = Picasso.get().load(quiz.getImageUrl()).get();

Now covert that Bitmap into a JPG file and store in the in the cache, below is complete code for getting the bimap and caching it

Thread thread = new Thread() {
 public void run() {
 File file = new File(getCacheDir() + "/" +member.getMemberId() + ".jpg");

try {
      Bitmap bitmap = Picasso.get().load(uri).get();
      FileOutputStream fOut = new FileOutputStream(file);                                        
      bitmap.compress(Bitmap.CompressFormat.JPEG, 100,new FileOutputStream(file));
fOut.flush();
fOut.close();
    }
catch (Exception e) {
  e.printStackTrace();
    }
   }
};
     thread.start();
  })

the get() method of Piccasso for some reason needed to be called on separate thread , i am saving that image also on that same thread.

Once the image is saved you can get all the files like that

List files = new LinkedList<>(Arrays.asList(context.getExternalCacheDir().listFiles()));

now you can find the file you are looking for like below

for(File file : files){
                if(file.getName().equals("fileyouarelookingfor" + ".jpg")){ // you need the name of the file, for example you are storing user image and the his image name is same as his id , you can call getId() on user to get the file name
                    Picasso.get() // if file found then load it
                            .load(file)
                            .into(mThumbnailImage);
                    return; // return 
                }
        // fetch it over the internet here because the file is not found
       }