Architecture Mismatch in Native Files for Android APK

[vikaspizone]

I follow the following steps as per documents :

1. I have built the repository for macOS on Intel-based systems and for Linux systems.

2. I have created the native files and .jar files as expected.

3. I ran the .jar file using your suggested command: java --class-path target/proj-2.1-SNAPSHOT.jar example/TransformPoints.java.

4. I need to use these .jar files in my Android project, which is based on Kotlin Compose. I have imported the "proj-2.1-SNAPSHOT.jar" file and can access its classes.

5. This .jar file produces the expected results when run in the terminal on my macOS laptop.

6. However, when I try to build the Android project to generate a debug APK, I encounter an error.

7. In Java, there is a file named "NativeResource.java" that contains a function called "libraryPath." This function imports a native file named "libproj-binding.dylib" (for macOS) or "libproj-binding.so" (for Linux).

8. The project builds without issues, but when I run the code to access the classes, I use the following function:

private fun transformPoints() {
    try {
        val transformPoints = TransformPoints.main(arrayOf("EPSG"))
        val factory = Proj.getAuthorityFactory("EPSG")
        val regops = Proj.getOperationFactory(null)
        val sourceCRS = factory.createCoordinateReferenceSystem("4326") // WGS 84
        val targetCRS = factory.createCoordinateReferenceSystem("3857")
        val operation = regops.createOperation(sourceCRS, targetCRS)
        val coordinates = doubleArrayOf(
            45.500, -73.567,  // Montreal
            49.250, -123.100,  // Vancouver
            35.653, 139.839,  // Tokyo
            48.865, 2.349 // Paris
        )
        operation.mathTransform.transform(
            coordinates, 0,  // Source coordinates.
            coordinates, 0,  // Target coordinates (overwriting the source).
            4  // Number of points to transform.
        )

        System.out.printf("Montreal:  %11.1f %11.1f%n", coordinates[0], coordinates[1])
        System.out.printf("Vancouver: %11.1f %11.1f%n", coordinates[2], coordinates[3])
        System.out.printf("Tokyo:     %11.1f %11.1f%n", coordinates[4], coordinates[5])
        System.out.printf("Paris:     %11.1f %11.1f%n", coordinates[6], coordinates[7])
    } catch (e: Exception) {
        Log.d("proj", e.localizedMessage.toString())
    }
}

9. This code throws an error: "throw new UnsatisfiedLinkError("Missing native file: " + nativeFile);".

10. I found that the root cause of the issue is a mismatch between the architecture of "libproj-binding.dylib" (macOS) or "libproj-binding.so" (Linux) and the Android system (APK) which uses ARM64 architecture.

11. Anyone Please help me generate the native file for the ARM64 architecture ?.