C#, Java, and Cpp Communication in Unity

Thu, 12 Sep 2024 00:00:00 +0000

This post covers four things:

How C# calls Java functions in Unity.
How Java calls C++ through JNI.
How C++ under JNI calls Java.
How Java calls Unity’s C#.

CSharp Call Java

Use Unity’s AndroidJavaObject, and pass the Java class object into the constructor. The format is the package name followed by the class name.

For example, in Java:

package com.example.jni;

public class ExampleJavaClass {
	// Function with no return value
	void TestFuncVoid(int a) { /* ... */ }
	// Function with a return value
	int TestFuncInt(int a) { /* ... */ }
}

In CSharp, write it like this:

CSharp on BlueHour

C#, Java, and Cpp Communication in Unity

CSharp Call Java