从统一C＃调用Java方法

Question

Hello everyone, Can anyone tell me how to call java methods from unity c#. I tried the following but its not working for me.

In Unity :

void OnGUI () {
    string somestring;
    AndroidJavaClass jc= new    AndroidJavaClass("com.example.pluginsample.MainActivity");
    AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject>("instance");
    somestring = jo.Call<string>("Foo");
    GUI.Label (new Rect (20, 20, 100, 20), somestring);
}

In Java Class:

public String Foo()
{
    return "Hello";        
}

Please help.I am stuck.Thanks in advance.

Answer 1

Exactly what "isn't working"? Is there an exception?

Check your java class has an instance() method that returns the java object:

public String Foo()
{
    return "Hello";        
}

public static MainActivity instance() {
    return new MainActivity();
}

Answer 2

There are several things to be checked:

1. Have you declared your plugin activity to AndroidManifest.xml?
2. Is there any instance class property (static variable) in you plugin activity?
3. If two points above doesnt help, can you make the Foo method to be static?

Let me know if this solution still does not work.

Answer 3

The similar question I saw on unity forum. Do have a look at the question and solution for that. Its working.

Answer 4

Make the function “Foo” public static as below

public static String Foo()
{
    return "Hello";        
}