在Android 2.1上，就像在大多数图形计算机操作系统上一样，在按钮中按下鼠标，然后拖走，再拖回，然后释放（在按钮矩形内）会导致按下按钮。当鼠标指针在按钮内（或实际上在按钮附近）时，它也会高亮显示，当指针离开区域时，它会熄灭，当指针返回时，它又会亮起。
这种行为允许用户通过拖动按钮直到其高亮显示关闭并释放，来取消中按；它还允许用户改变取消的想法，只要鼠标仍然按下，然后返回按钮“拯救”点击。
在2.2中，Android似乎不再允许返回按钮。拖动将取消高亮显示，但在按住鼠标的情况下返回不会重新高亮显示按钮，同时单击并返回也不会生成单击事件。
所以，我的问题是：这种变化是真的吗（其他人看到了吗）？和：这是故意的吗？如果这是有意的，那么这种改变的理由是什么？
由于我在安卓4.0.4中进行了测试，我可以猜测这是故意的。
我的猜测是，他们做出这一改变是为了防止那些不习惯触摸屏的人出现一些问题。它还可以提高残疾人的可用性。然而，我不是谷歌，也不知道改变的真正原因。这些只是我的猜测。
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