active Renderer
Gets/sets the active Renderer used by this ReaderView.
If responsiveRendererSelectionEnabled is true, this value returns null if checked immediately after setting up the ReaderView, as the ReaderView performs several async operations before selecting an active renderer.
You can set the active renderer yourself, using a renderer that was previously added to the ReaderView using addRenderer method. When manually assigning an activeRenderer, responsiveRendererSelectionEnabled will be set to false.
You can also listen for changes of active renderer by setting OnActiveRendererChangedListener with addOnActiveRendererChangedListener method.