title: How to get value from new android material design Slider
body: <p>Using new material design slider <code>com.google.android.material.slider.Slider</code>. The documentation is quite poor for it as it has been just recently released. Trying to get value from slider but no luck for now. In other words, what would be a slider's equivalent of <code>setOnProgressChanged { }</code> from Seekbar.</p>