Using a kotlin library in java code

Question

I have a kotlin library FlowLayout lib as aar,

and want to use it in my java code (android) but can not to resolve kotlin.Pair.

FlowLayoutManager layoutManager=new FlowLayoutManager(3, RecyclerView.HORIZONTAL, new FlowLayoutManager.Interface() {
    @Override
     public kotlin.Pair<Integer, Integer> getProportionalSizeForChild(int i) {
         return null;
     }
});

I have tried android.support.v4.util.Pair but is not compatible. How can I use a kotlin lib in java code with their object dependencies?

Do you have a dependency on the Kotlin library in your Java project (don't remember the artifact name, since they keep changing it, but maybe core)? — chrylis -cautiouslyoptimistic-
– chrylis -cautiouslyoptimistic-, Commented Jan 2, 2017 at 21:42

voddan · Accepted Answer · 2017-01-03 10:45:58Z

19

Class kotlin.Pair belongs to the standard library org.jetbrains.kotlin:kotlin-stdlib:1.0.0, so you must have this library as a dependancy.

It is NOT recommended to use Pair in public APIs. Rather than that, create your own data class with 2 properties and give them a clearer naming than first and second.

The purpose of Pair is to server as a temporary data carrier in any intermediate operation. If you use it in your API, you lose in clarity.

edited Jan 3, 2017 at 10:45

answered Jan 3, 2017 at 7:55

voddan

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