Fasm ARM how create apk for androide version 9.0 ?

APK is not executable format.
However it(package apk) contains binary (DVM - Dalvic Virtual Machine code) it has absolutely no relation to ARM native architecture code.
So for dalvic thou should look for example of fasmg with creating java class.
dalvic is child of java (in some approximation).

But not all is lost
Dalvik allowed to use in it native code(written in C++ or assembly(fasmARM for ex.)).
So dalvic could be in same role as MZ format for PE format - it incapsulate this and delegating control to PE.

But until now Dalvic-stub isn`t exist.
If someone will create it - it will open way of assemblers to android.

I think the APK file is just a ZIP. So once you have all the necessary asset and code files ready you just ZIP them together and name it APK.

Of course the hard part is generating the asset and code files.

By thour link described creation of ELF (not APK) - and way how to copy that elf with rights for execute it, and than execute it.
In fasmg instruction set AARCH64 looks that inside there is a example that will work on phone, the way how to copy it to android thou post thouself.

But I think ELF will not run on android without ROOT rights.

Try:

1. Android Studio: create project and add C++ sources. The IDE has menu option for that and it even generates simple C++ function for you.
2. Call the function from Java
3. Build your FASMARM code as a shared library (.so); export the same symbol from your code as the C++ code does
4. Unpack the APK and replace the .so file with yours
5. Pack it all to a new APK file and sign it