Realm example

.java

class User {
  @PrimaryKey
  private String id;
  private String name;
  private String avatar; // url do avatar
}

User user = new User("id", "Geovani", "https://68.media.tumblr.com/60c074d952ce220d58da51f9f99c4a58/tumblr_ojxrmvaMhN1qz7t0xo1_540.jpg");
Realm.init(context);

// Get a Realm instance for this thread
Realm realm = Realm.getDefaultInstance();

realm.beginTransaction();
realm.copyToRealm(user);
realm.commitTransaction();


ImageView mImageView = findViewById(r.id.image_view);
// Pra mostrar a imagem
Picasso picasso = Picasso.with(context);
picasso.setIndicatorsEnabled(false);
picasso.load(user.getAvatar())
  .into(mImageView);