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?
How can I call this C# method from Java then return the string value?
public string getTest () { return "test"; }
这是我尝试过的:
String str = UnityPlayer.UnitySendMessage("ProfileSave", "getTest","");
我遇到以下错误
String str=UnityPlayer.UnitySendMessage("ProfileSave", "getTest","");
^
required: String
found: void
推荐答案
UnityPlayer.UnitySendMessage
是void
函数,不返回值.看一下下面的UnitySendMessageExtension
函数实现.它类似于 turnipinindia的答案,但它返回一个值.它仅返回string
,因此您必须将该字符串转换为正在使用的任何变量类型.
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
}
}
使用Java:
String str = UnitySendMessageExtension("ProfileLoad", "testFunction","highScore");
这将与任何 C#函数一起使用.如果要返回值,只需确保像在testFunction
函数中一样在 C#函数末尾调用sendResultToJava
函数即可.
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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