Using Picasso with custom disk cache

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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 underlying HTTP client will only download an image over the network if one does not exist in its local cache (and that image isn’t expired).

That said, you can create custom cache implementation for java.net.HttpUrlConnection (via ResponseCache or OkHttp (via ResponseCache or OkResponseCache) which stores files in the format you desire. I would strongly advise against this, however.

Let Picasso and the HTTP client do the work for you!

You can call setIndicatorsEnabled(true) on the Picasso instance to see an indicator from where images are being loaded. It looks like this:

If you never see a blue indicator, it’s likely that your remote images do not include proper cache headers to enable caching to disk.

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