public Interpolator getInterpolator() {
        return mInterpolator;
    }
Sets the current interpolator. Note that a PathInterpolator must be set via
{@link #setQuadraticInterpolator(float, float, ControlPointCallback)} or
{@link #setCubicInterpolator(float, float, float, float, ControlPointCallback)}.
AnimationsInterpolatorPlayground/app/src/main/java/com/example/android/interpolatorplayground/CurveVisualizer.java