Build and use the Android SDK from source

[malte-v]

Title says it all. If not, I guess it wouldn't be that much work since this project anready handles a lot of the AOSP build system? Please correct me if I'm wrong, I don't know anything about this.

[malte-v]

I'm a little confused because this looks like building the SDK from source but the flake pulls in this which looks like a set of binary packages to me.

[danielfullmer]

Yes, it can be used the build the SDK. The current sdk directory was just a proof-of-concept for a particular version of the SDK. The prebuilt SDKs are currently only used in a few places (e.g. building some apps under apks/) In principle, I don't see any reason why we couldn't instead use the source-built SDKs inside robotnix, instead of relying on tadfisher/android-nixpkgs. It's definitely on the TODO list. I was hoping to have a robust automated builder + larger cache working before then, because it effectively makes most robotnix builds depend on additional large compilation step(s) for the SDK(s) used for any apps, and I expect most users would not want to build the SDKs themselves.

[malte-v]

I was hoping to have a source-built SDK inside nixpkgs: https://github.com/NixOS/nixpkgs/issues/75603#issuecomment-866284005 That would also solve our caching problem since it would be built by Hydra.

[tadfisher]

I would love for this to happen, btw. If this is something that would be better suited for me to implement in android-nixpkgs I would appreciate pointers for porting the sdk bits. If not, I'd love to help out here however I can.