One of them is based on mobile linux; which Samsung also uses for things like Bada and which has a lot of hardware vendors supporting it with drivers; including Samsung itself of course. Bada actually originated out of Nokia's Meego and Maemo mobile OS. That predates Android and early Android versions ran pretty much the same Linux kernels. The first devices running Android were actually Nokia N800s before they did the first Nexus.
Fuchsia is open source but closed source friendly (because of the license). I suspect that's actually the main non technical argument for Google to be doing this: Android is too open and they've been trying to fix that for years. Apple has a similar benefit with the BSD internals of IOS and OSX. Still OSS in part but mostly not and Apple has not bothered with supporting separate Darwin releases for a long time.
So, like with Android, I'd expect a fair amount of closed source secret sauce is going to be needed to run Fuchsia. More rather than less. I doubt Google free versions of Fuchsia are going to be a thing like it is a thing with Android. Google is doing this to take more control of the end user experience. Just like Apple does with IOS. Letting Samsung (or anyone) bastardize that is not really what they want here.
I'm guessing, Samsung actually wants less of that Google secret sauce at this point rather than more. They are trying to differentiate with exclusive features, their own UX, their own apps, and services, etc. I'm expecting a lot of OEMs are going to have a similar mindset. Especially the Chinese ones currently shipping flavors of Android without a Google license for the play services on the wrong side of the current trade wars (like Huawei). Google has got their work cut out there trying to get OEMs like that to swallow Fuchsia. I think, Google is going to end up supporting Android for a long time because of this even if they eventually launch Fuchsia (which in my opinion is not a certainty yet). The simple reason for this is that the alternative would be walking away from a chunk of the mobile market that they currently exploit via their play store. I don't see them surrendering that and I don't think they would want third parties to continue releasing Android without Google either. So, the only way to prevent that would be a long term Android development strategy regardless of whether they actually release Fuchsia or not.
So, reusing code across Android and Fuchsia makes a lot of sense.
Bada doesn't have anything to do with Linux, at all. It was a OS using a stack similar to Symbian.
You mean Tizen.
Which, just like Android, the only thing it shares with Linux, is the Linux kernel, now having its own C++ stack, .NET Core/Xamarin and there are still some Englightment leftovers.
Fuchsia is open source but closed source friendly (because of the license). I suspect that's actually the main non technical argument for Google to be doing this: Android is too open and they've been trying to fix that for years. Apple has a similar benefit with the BSD internals of IOS and OSX. Still OSS in part but mostly not and Apple has not bothered with supporting separate Darwin releases for a long time.
So, like with Android, I'd expect a fair amount of closed source secret sauce is going to be needed to run Fuchsia. More rather than less. I doubt Google free versions of Fuchsia are going to be a thing like it is a thing with Android. Google is doing this to take more control of the end user experience. Just like Apple does with IOS. Letting Samsung (or anyone) bastardize that is not really what they want here.
I'm guessing, Samsung actually wants less of that Google secret sauce at this point rather than more. They are trying to differentiate with exclusive features, their own UX, their own apps, and services, etc. I'm expecting a lot of OEMs are going to have a similar mindset. Especially the Chinese ones currently shipping flavors of Android without a Google license for the play services on the wrong side of the current trade wars (like Huawei). Google has got their work cut out there trying to get OEMs like that to swallow Fuchsia. I think, Google is going to end up supporting Android for a long time because of this even if they eventually launch Fuchsia (which in my opinion is not a certainty yet). The simple reason for this is that the alternative would be walking away from a chunk of the mobile market that they currently exploit via their play store. I don't see them surrendering that and I don't think they would want third parties to continue releasing Android without Google either. So, the only way to prevent that would be a long term Android development strategy regardless of whether they actually release Fuchsia or not.
So, reusing code across Android and Fuchsia makes a lot of sense.