时分秒之前不可选

可以加入 过了当前时间能不能选 就是我设置了当前时间 时分秒只能选这个时间以后的，过去的时间不可选，源码我也看了，目前是写死的，能否时分秒动态呢

Start by locating the Android time-picker implementation and the hard-coded hour, minute, and second bounds mentioned in the issue. Trace how the current time is supplied and how selectable values are constrained. Done means past time values are unavailable when current-time limits are enabled, while future values remain selectable; verify the behavior across hours, minutes, and seconds.

Written by the indexing model from the issue text.