This is one of the larger issues with Unity Android Plugins.
There's a few possibilities here. Use the below to get to the right answer
a) Does your plugin require that the Main Activity (i.e. Launcher activity) be "com.inno.myPlugin.MyClass"?
b) Do you override OnActivityResult in MyClass?
c) Neither of the above
If you answered yes to (a), then there's very little possibility that anyone but yourself can use this plugin, for a variety of reasons ranging from others being unable to tweak your code to conflicting packages.
If you answered yes to (b), then there's a decent possibility that others can use it, but they cannot use it if ANOTHER plugin requires that privilege as well
If you answered yes to (c) you should be good.
Easiest way to test it is to use your plugin in a fresh project, with a different package name, and check to see if it works.
Also, I'd advice that you stay away from extending UnityPlayerNativeActivity. The only reasons to extend UnityPlayerNativeActivity are
- To get the currentActivity (i.e. UnityPlayer.currentActivity)
- To use unitySendMessage
You can get both of these using reflection. currentActivity is a field, and unitySendMessage is a method. I won't go into detail here since it's not directly relevant to your question, but feel free to ping if you need some details.
Edit Adding some example code on request by the OP
Here's a sample plugin I made without extending UnityPlayerActivity or UnityPlayerNativeActivity. Note that I've just typed this straight in here, so there are probably errors in the code. One thing I know for sure is that the native code requires try-catch blocks, but any IDE should show up the error when you paste the code in.
Native Android Code
package com.myCompany.myProduct;
public class MyClass {
private Class<?> unityPlayerClass;
private Field unityCurrentActivity;
private Method unitySendMessage;
public void init () {
//Get the UnityPlayer class using Reflection
unityPlayerClass = Class.forName("com.unity3d.player.UnityPlayer");
//Get the currentActivity field
unityCurrentActivity= unityPlayerClass.getField("currentActivity");
//Get the UnitySendMessage method
unitySendMessage = unityPlayerClass.getMethod("UnitySendMessage", new Class [] { String.class, String.class, String.class } );
}
//Use this method to get UnityPlayer.currentActivity
public Activity currentActivity () {
Activity activity = (Activity) unityCurrentActivity.get(unityPlayerClass);
return activity;
}
public void unitySendMessageInvoke (String gameObject, String methodName, String param) {
//Invoke the UnitySendMessage Method
unitySendMessage.invoke(null, new Object[] { gameObject, methodName, param} );
}
public void makeToast (final String toastText, final int duration) {
currentActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getActivity(), toastText, duration).show();
}
});
}
}
Unity C# code
AndroidJavaObject myClass = null;
public void Init () {
if(myClass == null)
myClass = new AndroidJavaObject("com.myCompany.myProduct.MyClass");
if(myClass != null)
myClass.Call("init", new object[0]);
}
public void MakeToast (string toastText, int duration) {
if(myClass != null)
myClass.Call("makeToast", new object[] { toastText, duration } );
}
For the Manifest, change it to whatever you're calling the package name to be. Note that it DOES NOT have to match the package for the plugin! So, for example, here our plugin's package name is "com.myCompany.myProduct", you can use a package name like "com.someOtherCompany.someNewProduct"
How to test this plugin.
1. Add the native code above to "MyClass.java", and create a jar.
2. Copy this jar into Assets/Plugins/Android folder in your Unity Project.
3. Ensure that the package name is not the default package name in Unity
4. Copy the Unity C# code above into a new script
5. Put in some OnGUI code to call the "Init" & "MakeToast" methods in C#
Source - My expertise making plugins for Unity.
