如何使用 UnityPlayer.UnitySendMessage 调用方法并返回其值 [英] How to call method and return its value with UnityPlayer.UnitySendMessage

问题描述

如何从 Java 调用此 C# 方法然后返回字符串值?

public string getTest() { return "test";}

这是我试过的:

String str = UnityPlayer.UnitySendMessage("ProfileSave", "getTest","");

我收到以下错误

<块引用>

String str=UnityPlayer.UnitySendMessage("ProfileSave", "getTest","");^要求:字符串发现:无效

解决方案

UnityPlayer.UnitySendMessage 是一个 void 函数，不返回值.看看下面的 UnitySendMessageExtension 函数实现.它类似于 turnipinindia 的 答案，但它返回一个值.它只返回一个 string，因此您必须将该字符串转换为您正在使用的任何变量类型.

Java:

公共final类MyPlugin{//使类成为静态变量，以便将回调函数发送到此类的一个实例.公共静态 MyPlugin 测试实例；公共静态 MyPlugin 实例(){如果(测试实例 == 空){testInstance = 新的 MyPlugin();}返回测试实例；}字符串结果 = "";公共字符串 UnitySendMessageExtension(string gameObject, string functionName, string funcParam){UnityPlayer.UnitySendMessage(gameObject, functionName, funcParam);字符串 tempResult = 结果；返回临时结果；}//从C#接收结果并将其保存到结果变量中无效接收结果(字符串值){result = "";//清除旧数据结果 = 值；//获取新的}}

C#:

class TestScript: MonoBehaviour{//将PlayerPrefs中的数据发送到Java中的receiveResult函数void sendResultToJava(浮点值){using(AndroidJavaClass javaPlugin = new AndroidJavaClass("com.company.product.MyPlugin")){AndroidJavaObject pluginInstance = javaPlugin.CallStatic("instance");pluginInstance.Call("receiveResult",value.ToString());}}//从Java调用以获取保存的PlayerPrefsvoid testFunction(字符串键){float value = PlayerPrefs.GetFloat(key)//从key中获取保存的值sendResultToJava(value);//将值发送给Java}}

Java 中的用法:

String str = UnitySendMessageExtension("ProfileLoad", "testFunction","highScore");

这适用于任何 C# 函数.只要确保在 C# 函数的末尾调用 sendResultToJava 函数，就像我们在 testFunction 函数中所做的那样，如果您希望它返回价值.

How can I call this C# method from Java then return the string value?

public string getTest () { return "test"; }

This is what I've tried:

String str = UnityPlayer.UnitySendMessage("ProfileSave", "getTest","");

I am getting the below error

String str=UnityPlayer.UnitySendMessage("ProfileSave", "getTest","");                                 
^
 required: String  
 found:    void

解决方案

UnityPlayer.UnitySendMessage is a void function and does not return a value. Take a look at the UnitySendMessageExtension function implementation below. It is similar to turnipinindia's answer but it returns a value. It only returns a string so you have to convert that string to whatever variable type you are working with.

Java:

public final class MyPlugin
{
    //Make class static variable so that the callback function is sent to one instance of this class.
     public static MyPlugin testInstance;

     public static MyPlugin instance()
     {
         if(testInstance == null)
         {
             testInstance = new MyPlugin();
         }
         return testInstance;
     }

    string result = "";


    public string UnitySendMessageExtension(string gameObject, string functionName, string funcParam)
    {
        UnityPlayer.UnitySendMessage(gameObject, functionName, funcParam);
        string tempResult = result;
        return tempResult;
    }

    //Receives result from C# and saves it to result  variable
    void receiveResult(string value)
    {
        result = "";//Clear old data
        result = value; //Get new one
    }
}

C#:

class TestScript: MonoBehaviour
{
    //Sends the data from PlayerPrefs to the receiveResult function in Java
    void sendResultToJava(float value)
    {
        using(AndroidJavaClass javaPlugin = new AndroidJavaClass("com.company.product.MyPlugin"))
        {
             AndroidJavaObject pluginInstance = javaPlugin.CallStatic("instance");
             pluginInstance.Call("receiveResult",value.ToString());
        }
    }

    //Called from Java to get the saved PlayerPrefs
    void testFunction(string key)
    {
        float value = PlayerPrefs.GetFloat(key) //Get the saved value from key
        sendResultToJava(value); //Send the value to Java
    }
}

Usage from Java:

String str = UnitySendMessageExtension("ProfileLoad", "testFunction","highScore");  

This will work with any C# function. Just make sure that you call sendResultToJava function at the end of the C# function like we did in the testFunction function, if you want it to return value.

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