notify Drawables Changed
Notifies all registered DrawableProviderObserver instances that the drawables have changed and need to be reloaded and redrawn. If only drawables for a single page have changed, consider calling notifyDrawablesChanged instead.
Notifies all registered DrawableProviderObserver instances that the drawables for the given pageIndex
have changed and need to be reloaded and redrawn.
Parameters
page Index
Number of the page on which drawables have changed.