Difficulty resolving missing Android SDK APIs in iOS SDK during J2objc translation about j2objc

[tomball]

This isn't a bug, it's a discussion issue. In the future, please ask questions on Stack Overflow.

J2ObjC focuses on Java code that supports an app's business logic and data representations. J2ObjC is not designed for executing the Android API on iOS, it supports a similar subset of the Java Runtime Environment as Android does. For example, a class that imports any java.* classes is likely supported, whereas no android.* classes are. As far as I know, there is no iOS port of the Android API, because the application and UI classes of the two platforms are completely different.

Because an app needs its non-UI code separated from shareable Java, J2ObjC makes more sense the larger your app is (Gmail was its first use). You may be more productive with a platform-independent solution, like React Native or Flutter.