DragValueAnimator.java 文件源码

private long getDragAnimaDuration(Object... pointFs) {

        float x = ((PointF) pointFs[0]).x - ((PointF) pointFs[pointFs.length - 1]).x;
        float y = ((PointF) pointFs[0]).y - ((PointF) pointFs[pointFs.length - 1]).y;
        long duration = (long) (Math.hypot(x, y) * 1.6F);

        //关于这个比例自己调吧
        if (duration == 0) {
            return mDragAnimaDuration;
        } else if (duration > 0 && duration <= MIN_DURATION) {
            return MIN_DURATION;
        } else if (duration > MIN_DURATION && duration <= MAX_DURATION) {
            return duration;
        }
        return MAX_DURATION;
    }