public void startScroll(float start, float delta, int duration) {
        mFinished = false;
        mDuration = duration;
        mStartTime = AnimationUtils.currentAnimationTimeMillis();
        mStart = start;
        mFinal = start + delta;
        mDeltaX = delta;
        mDurationReciprocal = 1.0f / (float) mDuration;
    }
Returns where the scroll will end. Valid only for "fling" scrolls.

@return The final offset as an absolute distance from the origin.
menudrawer/src/net/simonvt/menudrawer/FloatScroller.java