public void setInterpolator(Interpolator mInterpolator) {
        mQuadraticPath = mCubicPath = false;
        mPathCallback = null;
        this.mInterpolator = mInterpolator;
        invalidate();
    }
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