‧AJAR arch
- app need to regist to MMI Manager Service
- Widget set
- resource
- global
- app
- service: interface between app & adaptor
- adaptor: interface to BSP(HW) a.k.a. GKI
‧Focus on one app at one time, dependent on display
- onOpenRequest v.s. onCloseRequest
- resume v.s. suspend
‧app should be independent with each other
‧Theme: has global effect，Skin: only change a app
