Creating a list of java strings in Unity C#

Question

I need to create a java list of java.lang.String in order to pass it to a method (for facebook sharing).

public E setPeopleIds(java.util.List<java.lang.String> peopleIds)

and this is how I call it

shareLinkContentBuilder.Call<AndroidJavaObject>("setPeopleIds", ToJavaList(facebookID));

I can't figure out how to create a list of java strings from c# strings. This is what I've tried but I get a nre exception on the list.Call line

private AndroidJavaObject ToJavaList(string value)
    {
        AndroidJavaObject list = new AndroidJavaObject("java.util.List");
        list.Call("add", new AndroidJavaObject("java.lang.String", value));
        return list;
    }

Can't find any info as most of the topics are on xamarin or they are using arrays instead of lists.

Answer 1

It could be that java.util.List is an interface and therefore cannot support methods like add by itself. You might have to use an implementation of a java list, like java.util.ArrayList

Another thing is that the latter function is creating a new list every time with only one element. I'm not sure if that's what you want.