Combine Java With Kotlin In Android

I am slightly moving from Java to Kotlin in android app development, but there are some cases where I don't want to code in Kotlin and want those particular cases be written i

Solution 1:

If your question is can you use kotlin files in java files and vice versa then the answer is yes.

If you are asking if you can use kotlin syntax in java files and vice versa then the answer is no.

To use kotlin code in a java class you are simply using the class like any other java class

Solution 2:

You can have in your project Java and Kotlin Class and Activities.

The same Class can't have Java and Kotlin. You can convert a Java file to Kotlin with Ctrl+Alt+Shift+K or just double tap SHIFT and search for Convert Java to Kotlin

Solution 3:

You can create a java similar static variables using companion object.

You can easily create singleton in Kotlin using object.

After I leant kotlin. I have migrated all my codes to Kotlin.

Solution 4:

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:

companionobject {  
    @JvmStaticfunnewInstance() ) SampleFragment()
}

which equals to

publicstaticSampleFragment() { returnnew SampleFragment(); } 

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