Combine Java with Kotlin in Android [closed]

Answer 1

Even if it's interop you can't mix Java and Kotlin in the same file.

If you really want to have static methods/variables you can use an companion object. You can also access create a "real" static method in your JVM by using @JvmStatic.

Simple sample is:

companion object {  
    @JvmStatic 
    fun newInstance() ) SampleFragment()
}

which equals to

public static SampleFragment() { return new SampleFragment(); } 

By using @JvmStatic you can use Java to access your Static methods like before.