Overscrollscale：listview仍然紧张

Question

图书馆Overscrollscale会修改listview过度滚动并使其在边缘处反弹。当用户滚动它时，该列表也会缩放，并在用户释放触摸后缩放回正常大小。

缩放listview的代码：

private static void setListScale(final ListViewExt listView, Canvas canvas, int offset, boolean isTween) {
        if (offset == 0) {
            canvas.scale(1, listView.getScaleY(), 0, listView.mLastPivotY);
            listView.invalidate();
            return;
        }
        double scaleRatio = Math.min(Math.max(0.0d, (Math.sqrt((double) Math.abs(offset)) * 3.0d) * 0.001d), 0.1d);
        if (listView.mIsShortList && offset < 0) {
            scaleRatio = -scaleRatio;
        }
        float scaleY = (float) (1 + scaleRatio);
        if (offset > 0 || listView.mIsShortList) {
            listView.mLastPivotY = 0.0f;
        } else {
            listView.mLastPivotY = (float) listView.getHeight();
        }
        listView.setPivotX(0);
        listView.setPivotY(listView.mLastPivotY);
        if (isTween) {
            if (listView.getScaleY() != 1) {
                canvas.scale(1, listView.getScaleY(), 0, listView.mLastPivotY);
                listView.invalidate();
            }
            if (listView.mAnimatorSet != null) {
                listView.mAnimatorSet.cancel();
            }
            listView.mAnimatorSet = new AnimatorSet();
            ValueAnimator scaleBackAnimator = ValueAnimator.ofFloat(scaleY, 1);
            scaleBackAnimator.setDuration(400);
            scaleBackAnimator.setInterpolator(new BackEaseOutInterpolater());
            scaleBackAnimator.addUpdateListener(new AnimatorUpdateListener() {
                public void onAnimationUpdate(ValueAnimator animation) {
                    listView.setScaleY((Float) animation.getAnimatedValue());
                    listView.invalidate();
                }
            });
            if (listView.getScaleY() == 1) {
                ValueAnimator scaleAnimator = ValueAnimator.ofFloat(1, scaleY);
                scaleAnimator.setDuration(200);
                scaleAnimator.setInterpolator(new CircEaseOutInterpolator());
                scaleAnimator.addUpdateListener(new AnimatorUpdateListener() {
                    public void onAnimationUpdate(ValueAnimator animation) {
                        listView.setScaleY((Float) animation.getAnimatedValue());
                        listView.invalidate();
                    }
                });
                listView.mAnimatorSet.play(scaleAnimator).before(scaleBackAnimator);
            } else {
                listView.mAnimatorSet.play(scaleBackAnimator);
            }
            listView.mAnimatorSet.start();
            return;
        }
        canvas.scale(1, scaleY, 0, listView.mLastPivotY);
        listView.setScaleY(scaleY);
        listView.invalidate();
    }

onTouchEvent中ListView的代码：

@Override
public boolean onTouchEvent(MotionEvent ev) {

    int y = (int) ev.getY();
    switch (ev.getActionMasked()) {
        case MotionEvent.ACTION_DOWN://0
        case MotionEvent.ACTION_POINTER_DOWN:
            ListViewEnhance.onTouchDown(this, ev);
            this.mDownMotionY = (y - (this.mLastY - this.mDownMotionY));
            this.mLastY = y;
            break;
        case MotionEvent.ACTION_POINTER_UP:
        case MotionEvent.ACTION_UP:
            this.mLastY = y;
            if (this.mIsTouching) {
                this.mIsTouching = false;
            }
            break;
        case MotionEvent.ACTION_CANCEL:
            if (this.mIsTouching) {
                this.mIsTouching = false;
                ListViewEnhance.resetScale(this);
            }
            break;
        case MotionEvent.ACTION_MOVE: {
            int offset = (y - this.mDownMotionY);

            if (!this.mIsTouching) {
                ListViewEnhance.onTouchDown(this, ev);
            }
            this.mInertia = y - mDownMotionY;

            if (ListViewEnhance.needListScale(this, offset)) {
                this.mLastY = y;
                return true;
            } else {
                if (y != this.mLastY) {
                    this.mLastY = y;
                }
            }
        }
        break;
    }

    return super.onTouchEvent(ev);
}

问题：

有时，即使触摸发布后，列表仍会保持拉伸状态。 什么可能导致这种行为？

触摸后的拉伸列表：

对问题的长度表示歉意，但我认为代码可能具有相关性。任何帮助将不胜感激！