AndroidJavaProxy是个好东西,可以让安卓原生代码直接调用Unity的代码，而不用通过SendMessage的方式。
今天在使用的过程中发现一个问题，Android调用Unity的方法时报错:
No such proxy method: xxxx(AndroidJavaObject)
经过各种尝试和Google以后发现了最终的原因：
首先贴出代码
Java代码IListener.java
package com.company.test;
public interface IListener {
public void onComplete(String error);
}
Java代码:Test.java
package com.company.test;
public class Test {
private IListener listener;
public void setListener(IListener listener) {
this.listener = listener;
}
public void doTask() {
listener.onComplete(null);
}
public static Test create() {
return new Test();
}
}
Unity代码:Test.cs
using UnityEngine;public class Test : MonoBehaviour
{
private AndroidJavaObject nativeJavaObject;class Listener : AndroidJavaProxy
{
public Listener() : base("com.company.test.IListener")
{}
void onComplete(string error)
{
Debug.Log($"onComplete:{error}");
}
}
// Start is called before the first frame update
void Start()
{
AndroidJavaClass javaClass = new AndroidJavaClass("com.company.test.Test");
nativeJavaObject = javaClass.CallStatic<AndroidJavaObject>("create");
nativeJavaObject.Call("setListener", new Listener());
nativeJavaObject.Call("doTask");
}
}
Unity场景中把Test.cs脚本挂到GameObject上打包在真机运行会报以下错误:
No such proxy method: Test+Listener.onComplete(UnityEngine.AndroidJavaObject)
问题出现的是在UnityEngine.AndroidJavaProxy.Invoke的实现中
public virtual AndroidJavaObject Invoke(string methodName, object[] args)
{
Exception inner = (Exception) null;
BindingFlags bindingAttr = BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic;
System.Type[] types = new System.Type[args.Length];
for (int index = 0; index < args.Length; ++index)
// 如果参数为null则将类型设置为AndroidJavaObject
types[index] = args[index] == null ? typeof (AndroidJavaObject) : args[index].GetType();
try
{
MethodInfo method = this.GetType().GetMethod(methodName, bindingAttr, (Binder) null, types, (ParameterModifier[]) null);
if (method != null)
return _AndroidJNIHelper.Box(method.Invoke((object) this, args));
}
catch (TargetInvocationException ex)
{
inner = ex.InnerException;
}
catch (Exception ex)
{
inner = ex;
}
string[] strArray = new string[args.Length];
for (int index = 0; index < types.Length; ++index)
strArray[index] = types[index].ToString();
if (inner != null)
throw new TargetInvocationException(this.GetType().ToString() + "." + methodName + "(" + string.Join(",", strArray) + ")", inner);
AndroidReflection.SetNativeExceptionOnProxy(this.GetRawProxy(), new Exception("No such proxy method: " + (object) this.GetType() + "." + methodName + "(" + string.Join(",", strArray) + ")"), true);
return (AndroidJavaObject) null;
}
当Java调用Unity方法传递过来的值为null时，AndroidJavaProxy会按照参数类型为AndroidJavaObject的方式去查找方法(见上面第8行代码)，自然就找不到。然后就报错了
解决方法也很简单，重写Invoke方法避免查找Method失败就可以了
public override AndroidJavaObject Invoke(string methodName, object[] args)
{
if (methodName == "onComplete")
{
onComplete(args[0] as string);
return null;
}
return base.Invoke(methodName, args);
}
再次打包程序运行就不会报错，能正常输出日志了.
PS:上面的修复代码只是测试使用，正式项目中请自行补全错误处理，参数转换以及多方法的支持等代码
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