Android: How to call ndk function from Kotlin?

This code works on Java. But after migration to Kotlin, compiler higlits method `native fun stringFromNative(): String` as error with following text:

> Function without a body must be abstract

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

Toast.makeText(this, stringFromNative(), Toast.LENGTH_LONG).show()
}

companion object {

init {
System.loadLibrary("_ndkkt")
}
native fun stringFromNative(): String
}
}


Thanks @KenVanHoeylandt!

Andswer is:

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

Toast.makeText(this, stringFromNative(), Toast.LENGTH_LONG).show()
}

init {
System.loadLibrary("_ndkkt")
}

external fun getStringFromNative(): String
}

}

If you wish to use this native function in another class you can specify the class which encloses it as in:

val aStringFromNative : String = MainActivity().getStringFromNative()

Put `external fun stringFromNative(): String` outside of the companion object and into the `MainActivity`.

(I found the answer by looking at

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)

Kotlin :

call method from ndk file
external fun stringFromJNI(): String


load c++ file
companion object {
init {
System.loadLibrary("native-lib")
}
}