Calling a Unity C# method that returns a value from Android/Java

Question

I am developing an Android plugin for Unity and I am wondering if there is a way in the Android code to call a Unity C# method that returns a value and get this value.

Of course this will NOT work but is there a way, tips, tricks to achieve something like this:

String myReturnedString = UnityPlayer.UnitySendMessage("MyGameObject", 
                          "ReturnThisString","hello");

Many thanks for your help.

CodeMonkey · Accepted Answer · 2016-11-03 16:33:54Z

3

In Android:

int Times_Called;
public  int Get_Times_Called()
{
   Times_Called += 1;
   return  Times_Called;
}

In Unity

 AndroidJavaClass Java = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
 AndroidJavaObject AndroidActivity = Java.GetStatic<AndroidJavaObject>("currentActivity");
 int Times_Called = AndroidActivity.Call<int>("Get_Times_Called");
        Debug.Log("Get_Times_Called: " + Times_Called);

answered Nov 3, 2016 at 16:33

CodeMonkey

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Comments

Alvin Tandian · Accepted Answer · 2014-08-28 04:11:19Z

One way is to have a method in your Unity program that communicates with your Android application through a method in your Android app, by using AndroidJavaObject.Call in your Unity class.

e.g. You have this method in your Android application.

AndroidActivity.java

String stringFromUnity = "";

public void setStringFromUnity(String input){
    stringFromUnity = input;
}

Then in your Unity script (I am using C#).

UnityScript.cs

// Get the UnityPlayer class
AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");

// Get the current activity
AndroidJavaObject activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");

// Call the setStringFromUnity method from Android Activity
activity.Call("setStringFromUnity", "Here is a string for you, Android");

OR we can set the String directly using the AndroidJavaObject.Set method.

// Set the String directly provided the String is public
activity.Set<string>("stringFromUnity", "I set your String directly, hah!");

Hope this helps.

For reference, you can search for "Unity Plugins for Android" or take a look at Unity documentation at this link.

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