You can use a Callback
to get onSuccess and onError events. Just add a new Callback to your request like so:
Picasso.with(getContext())
.load(url)
.into(imageView, new com.squareup.picasso.Callback() {
@Override
public void onSuccess() {
}
@Override
public void onError() {
}
});
Then you can perform any alterations and modifications in the onSuccess callback.