C＃/ Xamarin构造函数新的Java对象

Question

需要使用C＃/ Xamarin来使用Java库。

爪哇

class MyObject{
    private final string1;
    private final Date date;
    public MyObject(final String string1, final Date date){
        //init here
    }
}

在生成的.cs文件中......

namespace Com.MyPackage{
    internal MyObject(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer){}

    static IntPtr id_getString1;
    public unsafe string String1{
        [Register ("getString1", "()Ljava/lang/String;", "GetString1Handler")]

        get{
            if(id_getString1 == IntPtr.Zero){
                id_getString1 = JNIEnv.GetMethodID(class_ref, "getString1", "()Ljava/lang/String;");
                try{
                    return JNIEnv.GetString(JNIEnv.CallObjectMethod(((global::Java.Lang.Object) this).Handle, id_getString1), JniHandleOwnership.TransferLocalRef);
                }finally{
                }
            }
        }
    }

    //...
}

好的，所以它是内部的。所以我创建了一个新方法并将其更改为：

namespace Com.MyPackage{
    public MyObject(Java.Lang.String string1, Java.Util.Date dateIntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer){
        String1 = string1; //error
    }

    static IntPtr id_getString1;
    public unsafe string String1{
        [Register ("getString1", "()Ljava/lang/String;", "GetString1Handler")]

        get{
            if(id_getString1 == IntPtr.Zero){
                id_getString1 = JNIEnv.GetMethodID(class_ref, "getString1", "()Ljava/lang/String;");
                try{
                    return JNIEnv.GetString(JNIEnv.CallObjectMethod(((global::Java.Lang.Object) this).Handle, id_getString1), JniHandleOwnership.TransferLocalRef);
                }finally{
                }
            }
        }
    }

    //...
}

这会导致错误

  

属性或索引器＆＃39; MyObject.String1＆＃39;无法分配 - 它是只读的

这就是我试图在C＃中获取新实例的方法。

IntPtr Map_Class = JNIEnv.FindClass("com/myPackage/MyObject");
IntPtr Map_defCtor = JNIEnv.GetMethodID(Map_Class, "<init>", "(Java.Lang.String, Java.Util.Date)V");
IntPtr ptr = JNIEnv.NewObject(Map_Class, Map_defCtor);
MyObject myObject = new MyObject("hello world", new Java.Util.Date(123),
        ptr, JniHandleOwnership.TransferLocalRef
).JavaCast<MyObject>();