Problems acessing AIDL with minifyEnabled

[JHarzenetter]

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General information

1. Android Version: 14
2. Android Vendor/Custom ROM: Samsung
3. Device: Galaxy A23 5G
4. Version of the app (version number/play store version/self-built): Current PlayStore-Version

Description of the issue

I get some problems after i added the aidl API and trying to relase it with minification enabled. Additional i tried this example app and narrowed it down to the following problem

1. Edit build.gradle from exampleApp and add the following

   buildTypes{
       release {
           minifyEnabled true
           signingConfig signingConfigs.debug
       }
   }

2. Make sure it's an fresh installation.
3. Open the App

Whats missing after App start:

• Permission Request to manage "OpenVPN for Android"
• basic functionality (e.g. "Start embedded profile" crashed the App)

I'm pretty sure that it's the minifyEnabled-Flag thats causing it. Maybe you can help me out. And no disableing the minification is not an option because it causes the app to be 5x the size

[schwabe]

Yes, minify changes class names. You need to add a configuration to avoid this. Or just disable renaming of classes if possible. But I am not using minify myself, so I cannot give you any further help at the moment. But a PR that adds a minify configuration is weclome.

[JHarzenetter]

@schwabe I tried it myself and got it working in a very simple way. Just add the following in the proguard-rules.pro file in the Project which is using the AIDL.

-keep interface de.blinkt.openvpn.api.IOpenVPNAPIService { *; }
-keep interface de.blinkt.openvpn.api.IOpenVPNStatusCallback { *; }
-keep class de.blinkt.openvpn.api.APIVpnProfile { *; }

[schwabe]

Thanks I added these rules to the example project.