Sending String of Data through JNI to Android Plugin

Questions & Answers
1

I have an android plugin (java) that I am using the JNI interface to communicate to, In this plugin I must send a String in a method call and seem to be fudging something up

Code:

Setting up JNI (works for all other functions so my Class Object is valid and working)

meth_SendCommand = JNI.GetMethodID(cls_TactorPlayer,
 "SendCommand", "(Ljava/lang/String;)I");

Sending the Data

    String str_command = "Hello Plugin!";

    IntPtr ptr = Marshal.AllocHGlobal(str_command.Length);

    Marshal.Copy(str_command.ToCharArray(), 0, ptr, str_command.Length);

    int returnval = JNI.CallIntMethod(TactorPlayer, meth_SendCommand,ptr);

Capturing the Data within my Java Class

public int SendCommand(String command)
    {
            Log.d("--UNITYJAR-- SendCommand=", String.valueOf(command));
        return 0;
    }

Printing out my intptr that I send shows a valid address But I am guessing the way I Create the intptr to copying the data into it may be my issue

Help is greatly appreiciated, I am running out of ideas!

Thanks

Greg

2

I had good luck using the AndroidJNI to skip the C++ part. With it you could, in a Unity script, do something like this;

`//Grab the object AndroidJavaObject javaObject = new AndroidJavaObject("com.myCompany.myStuff.myClass"); javaObject.Call("SendCommand",command);`

Sorry if you need the C++ parts and this doesn't apply to you.