public void setDefaultOptions(DefaultOptions options) {
        this.options = options;
    }
Sets an interface that can apply some default options to all Requests started using this {@link RequestManager}.

<p>
    Note - These options will be retained for the life the of this {@link RequestManager}
    so be wary of using
    {@link GenericRequestBuilder#listener(com.bumptech.glide.request.RequestListener)}} when
    starting requests using an {@link Context} or {@link android.app.Application} to avoid
    leaking memory. Any option that does not use an anonymous inner class is generally safe.
</p>

@param options The default options to apply to all requests.
core/src/main/java/com/bumptech/glide/RequestManager.java