PI does not allow specifying networks that should not be routed via the VPN. As a workaround the app tries to detect networks that should not be routed over tunnel (e.g. route x.x.x.x y.y.y.y net_gateway) and calculates a set of routes that excludes this routes to emulate the behaviour of other platforms. The log windows shows the configuration of the VPNService upon establishing a connection.
Behind the scenes: Android 4.4+ does use policy routing. Using route/ifconfig will not show the installed routes. Instead use ip rule, iptables -t mangle -L
请注意最后一段！今后千万别胡乱承认一些不是自己干的事情了，持同样想法的人太多了，人本来就是以群分的。另外，要对自己有信心，厂商的开发者也和自己一样，会犯错误，会不规范，当然解决问题的风格也可能和自己是一模一样的，毕竟知识是共享的，而我可能恰好又和他共享了一点相同的文化，所不同的可能只是，他在谷歌(只是可能)，而我没有(能力进去)。