Android如何在多个接入点中进行选择？

Question

我一直在做这方面的大量研究。不幸的是，我无法找到默认情况下Android在多个接入点中选择的方式。

例如，如果用户走进商场并且范围内有3个热点，设备如何选择要连接的接入点？

-Does the device select the AP based in the order in which they are in the Wi-Fi stack? 
-Does the device select the AP based on signal strength only? 
-Does the device select the AP randomly?

此外，当用户从AP A的覆盖范围物理移动到AP B的覆盖范围时：

-Does the device stay connected with AP A until it is out of range?
-Does the device transition from AP A to AP B somewhere along the way (sort of like a soft handoff)?

提前谢谢。