android - Load images from disk cache with Picasso if offline

Question

I have some images that I download from different web sites when the app starts, by doing this:

Picasso.with(context).load(image_url).fetch();

Now, suppose the user closes the app and turns offline. When the app starts again, Picasso display the images in this way:

Picasso.with(ctx).load(image_url).placeholder(R.drawable.ph).into(imageView);

The problem is that some images are loaded from the disk cache (yellow triangle in debug mode), and for the others Picasso shows the placeholder.

Why? I'm expecting that every image is loaded from the disk cache.

Answer 1

You can use this code by this strategy Picasso will look for images in cache and if it failed only then image will be downloaded over network.

 Picasso.with(context)
                    .load(Uri.parse(getItem(position).getStoryBigThumbUrl()))
                    .networkPolicy(NetworkPolicy.OFFLINE)
                    .into(holder.storyBigThumb, new Callback() {
                        @Override
                        public void onSuccess() {

                        }

                        @Override
                        public void onError() {
                            // Try again online if cache failed
                            Picasso.with(context)
                                    .load(Uri.parse(getItem(position)
                                            .getStoryBigThumbUrl()))
                            .placeholder(R.drawable.user_placeholder)
                            .error(R.drawable.user_placeholder_error)
                                    .into(holder.storyBigThumb);
                        }
                    });