As per my experience in customize of Android OSP, we have using that framework library and we are facing that normally challenging in framework side whenever we customize our framework or system services that test case is not passing in that instrument testing sometime unit testing is not passing or pipeline is failing, we can comparably test is not matching in our requirement that performance application performance is not as fast in as per actual production production side we check that application memory like profiler optimize our application communication communication with the IPC binder through AIDL through we checking to our security security concern like whenever we have some data like user data or some vehicle data we are how we in how we hide that data and that through we can sample that as per customize SC Linux policy through we can read write permission we can given and we found some challenge like some infrastructure is not as per development side and when application is going to production side we can follow that that that thing is not come exactly is matching and whenever we upgrade lower version to higher version that thing we facing some challenge like whenever our application is supporting 12 and currently market side Android 14 and 15 is currently coming and a lot of functionality is coming in Android side we we go to customize the upgrade our higher version we can customize that application lot of thing we need to facing and whenever we consume that battery battery power application is continuously running in 3 hours 4 hours and like we are currently I am working in Scania navigation application and that truck driver is going to like 100 kilometer 200 kilometer continuously application is running and battery consuming that thing we can saving our power framework through we can how we if low battery is happening how we manage that thing notification how we aware of next whenever truck is going and some validation is there that notification is coming and that's mostly focus on UX UI part it's easily to customize for individual they can touch that touch the application feel that thing is working fine
