AndroidJavaObject.Call array passing error (Unity for Android)

Question

I'm working on Unity for Android application, which uses native Android plugin. Inside of it I use AndroidJavaObject's Call method.

As it says in documentation, signature of method is:

public void Call(string methodName, params object[] args);

I want to send array of strings into my project:

string[] strings = new string[] { "string1", "string2", ...};
myAndroidJavaObject.Call("myMethod", strings);

And receive it into Java code:

public void myMethod(String[] strings){
    // some code where I use strings
}

But I receive error:

AndroidJavaException: java.lang.NoSuchMethodError: no non-static method with name='myMethod' signature='(Ljava/lang/String;Ljava/lang/String;)V' in class Ljava.lang.Object;

Can anyone describe program's behavior in this situation?

Foggzie · Accepted Answer · 2017-03-08 21:03:40Z

8

Arrays require special treatment when being sent to an AndroidJavaObject. Taken from this article, you can implement a function that will handle it like so:

private AndroidJavaObject javaArrayFromCS(string [] values) {
    AndroidJavaClass arrayClass  = new AndroidJavaClass("java.lang.reflect.Array");
    AndroidJavaObject arrayObject = arrayClass.CallStatic<AndroidJavaObject>("newInstance", new AndroidJavaClass("java.lang.String"), values.Count());
    for (int i=0; i<values.Count(); ++i) {
        arrayClass.CallStatic("set", arrayObject, i, new AndroidJavaObject("java.lang.String", values[i])));
    }

    return arrayObject;
}

You can then call into your function like this:

myAndroidJavaObject.Call("myMethod", javaArrayFromCS(strings));

answered Mar 8, 2017 at 21:03

Foggzie

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Comments

Mykolas · Accepted Answer · 2022-10-24 11:36:47Z

2

What you need to do is cast the string array to an object, like the following code;

string[] strings = new string[] { "string1", "string2", ...};

myAndroidJavaObject.Call("myMethod", **(object)** strings);

edited Oct 24, 2022 at 11:36

answered Aug 9, 2018 at 15:18

Mykolas

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