How to implement my own disk cache with picasso library - Android?

Picasso uses the HTTP client for disk caching and if one is already configured it will use that instead of installing its own.

For the built-in UrlConnection the docs for installing a cache are here: https://developer.android.com/reference/android/net/http/HttpResponseCache.html

If you are using OkHttp then you just call setCache: http://square.github.io/okhttp/2.x/okhttp/com/squareup/okhttp/OkHttpClient.html#setCache-com.squareup.okhttp.Cache-

@Dax, to save files in custom cache directory using OkHttp, I would code something like this -

OkHttpClient okHttpClient = new OkHttpClient();
File customCacheDirectory = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + "/MyCache");
okHttpClient.setCache(new Cache(customCacheDirectory, Integer.MAX_VALUE));
OkHttpDownloader okHttpDownloader = new OkHttpDownloader(okHttpClient);
Picasso picasso = new Picasso.Builder(mainActivity).downloader(okHttpDownloader).build();
picasso.load(imageURL).into(viewHolder.image);

Hope this helps.