shakarover/hello-kni

Demo for Jni call Kotlin-Native lib.

Hello KNI

This is a Demo of Jni calling Kotlin Native originated from Google's jni demo.

Contents

Kotlin Native can interop with C directly. In order to call Kotlin Native functions from Java, we should use CName to annotated the functions with a proper name:

@CName("Java_com_example_hellojni_HelloJni_stringFromJNI")
fun stringFromJNI(env: CPointer<JNIEnvVar>, thiz: jobject): jstring {
    memScoped {
        return env.pointed.pointed!!.NewStringUTF!!.invoke(env, "This is from Kotlin Native!!".cstr.ptr)!!
    }
}

What's in the demo：

• Uses of Android Log
• Return a Java String
• Call Java methods from Kotlin Native

How to Build

Simply Build and run your app. Dependencies are carefully managed by gradle.

Preview

Screen shot:

Logcat :