Question The right way to extend UnityPlayerActivity in a jar plugin?

In Unity 5 I just need add classes.jar in dependecies, then I can create an Activity class to extend UnityPlayerActivity.

Now in Unity 2020 UnityPlayerActivity becomes a java file. If I copy this file to my plugin project, this class will be included in the output jar file. But there will be a class conflict when building apk.

So I have to extract the jar, delete UnityPlayerActivity.class, and pack other files again. I don't think this is the right way to build a plugin. Is there a workaround?

 

Unity's classes.jar already have UnityPlayerActivity.class file.
Just include classes.jar as dependency (under libs folder) and you don't need to do anything extra.

Code (build.gradle):

1. dependencies {
2.     implementation fileTree(include: ['*.jar'], dir: 'libs')
3.     ....
4. }

 

Sorry I forgot to mention that I'm using Unity 2020, Is UnityPlayerActivity.class added into classes.jar in Unity 2022?

 

Could you tell me which version and where is the classes.jar that contains UnityPlayerActivity.class?

I've just downloaded Unity 2021.2.7f1, and I've checked classes.jar in following path

• Editor\Data\PlaybackEngines\AndroidPlayer\Variations\il2cpp\Release\Classes
• Editor\Data\PlaybackEngines\AndroidPlayer\Variations\il2cpp\Development\Classes
• Editor\Data\PlaybackEngines\AndroidPlayer\Variations\mono\Release\Classes
• Editor\Data\PlaybackEngines\AndroidPlayer\Variations\mono\Development\Classes

Unfortunately UnityPlayerActivity.class is in none of them.

 

Ok, I got the problem now.
I'm currently using old unity version's jar(2018.4) so I don't see such problem. However, As its just for reference alone, it should be fine.

However, if you like to do it, there are two options
1. Create a new android library project from classes.jar and the UnityPlayerActivity.java file and use it as a dependency module.
2. Include the UnityPlayerActivity.java and write a gradle task to exclude that class file in the final archive (as you mentioned earlier)