AndroidJavaProxy 不是接口

问题描述

我正在尝试在 Unity 中使用 Android 手机的摄像头.我需要将 CameraDevice.StateCallback 传递给 CameraManager.openCamera 方法，我是这样构造的:

I'm trying to use an Android phone's camera in Unity. I need to pass a CameraDevice.StateCallback to the CameraManager.openCamera method, which I have constructed as such:

public class OpenCameraCallbackProxy : AndroidJavaProxy
{
    public OpenCameraCallbackProxy() : base("android.hardware.camera2.CameraDevice$StateCallback")
    {

    }

    public void onOpened(AndroidJavaObject cameraDevice)
    {
        // etc...
    }
}

调用openCamera方法时(cameraManager是AndroidJavaObject的一个实例):

When calling the openCamera method (cameraManager is an instance of AndroidJavaObject):

cameraManager.Call("openCamera", cameraId, new OpenCameraCallbackProxy(), null);

我收到以下异常:

java.lang.IllegalArgumentException: class android.hardware.camera2.CameraDevice$StateCallback 不是接口.

我还在我的应用程序的其他地方使用了一个专有的 Java 库，它使用了回调，并且这个方法(使用 AndroidJavaProxy)可以正常工作.我猜必须检查 openCamera 如果不是 callback.getClass().isInterface() 或类似的东西.有什么办法可以解决这个问题吗?

I am also using a proprietary Java library elsewhere in my application which uses callbacks, and this method (using AndroidJavaProxy) works properly. I'm guessing that there must be a check in openCamera to throw if not callback.getClass().isInterface() or something like that. Is there any way I could get around this?

提前致谢.

推荐答案

AndroidJavaProxy 的构造函数需要为回调实现接口的完全限定名称字符串.想必这是因为传回给你的对象是运行时构造的类，所以它的签名在编译时是不可用的，但是构造运行时对象的代码可以实现给定的接口(如何?我不知道，除了它会使用 ASM，但这就像说我不"不知道他们是如何制作那个梳妆台的，但可能涉及到锯子").

AndroidJavaProxy's constructor requires the fully qualified name string of the interface to be implemented for the callback. Presumably this is because the object passed back to you is a runtime constructed class, so its signature is not available at compile time, but that the code that constructs the runtime object can implement a given interface (how? I have no idea, other than it would use ASM, but that's like saying "I don't know how they made that dresser, but a saw was probably involved").

但是，CameraDevice.StateCallback 不是一个接口，它是一个抽象类.

However, CameraDevice.StateCallback is not an interface, it is an abstract class.

使用 AndroidJavaProxy 的 Unity 示例使用 DatePickerDialog$OnDateSetListener 回调接口，我们可以看到其实是一个接口.

The Unity example for using the AndroidJavaProxy uses a DatePickerDialog$OnDateSetListener callback interface, which we can see is actually an interface.

我不确定你应该做什么(可能子类化 CameraDevice.StateCallback?这就是 这个人 做到了)，因为我从来没有尝试过这样做，但这就是为什么你会得到你所得到的错误.

I am not sure what you should be doing instead (possibly subclassing CameraDevice.StateCallback? That's what this guy did) as I've never tried to do this, but that's why you're getting the error your getting.

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