问题
In one of my Custom view, inheriting from a View group, I was getting Key_Down and Key_Up events for a Tab key in dispatchKeyEvent method.
A latest update on Google Keyboard upgraded it from 4.0.* to 5.0.*. Post this update, I am not getting Key_Down in dispatchKeyEvent in the ViewGroup. I have checked that I am getting both Key_Down and Key_Up events in dispatchKeyEventPreIme in ViewGroup. Also, I am not handling Key_Down in OnKeyPreIme in my Custom View.
I am not able to figure out, who is eating away Key_Down event in this case? I continue to get Key_Up event like before. For this, I am trying to understand where input keyboard sit in the flow for dispatching key events. Couldn't find much info regarding this on web.
Would appreciate any help/pointers. Thanks!
来源：https://stackoverflow.com/questions/37949252/where-does-default-input-keyboard-sit-in-the-flow-for-dispatching-key-events-on