Android Picasso library, How to add authentication headers?

Question

I have tried setting a custom OkHttpClient with a custom Authenticator, however as the doc says: \"Responds to authentication challenges from the remote web or proxy server.

Answer 1

See bryant1410's answer for a more up-to-date solution.

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Something like this does the job for setting an API-key header:

public class CustomPicasso {

    private static Picasso sPicasso;

    private CustomPicasso() {
    }

    public static Picasso getImageLoader(final Context context) {
        if (sPicasso == null) {
            Picasso.Builder builder = new Picasso.Builder(context);
            builder.downloader(new CustomOkHttpDownloader());
            sPicasso = builder.build();
        }
        return sPicasso;
    }

    private static class CustomOkHttpDownloader extends OkHttpDownloader {

        @Override
        protected HttpURLConnection openConnection(final Uri uri) throws IOException {
            HttpURLConnection connection = super.openConnection(uri);
            connection.setRequestProperty(Constants.HEADER_X_API_KEY, "MY_API_KEY");
            return connection;
        }
    }
}