Keep Rules in Proguard Files (Using R8 Minify)
I'm developing an Immersive App for Meta Quest using the Meta Spatial SDK in Android Studio with R8 minification enabled. When building a signed APK, I encounter the following error:
Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in D:\AndroidProject\[package-name]\app\build\outputs\mapping\questRelease\missing_rules.txt.
Missing class horizonos.app.container.TaskContainer (referenced from: horizonos.app.container.TaskContainer com.meta.spatial.runtime.PanelDisplay.taskContainer and 4 other contexts)
Missing class horizonos.app.container.TaskContainerManager$TaskContainerCallback (referenced from: horizonos.app.container.TaskContainer com.meta.spatial.runtime.PanelDisplay.tryGetTaskContainer(android.content.Context, android.content.Context) and 2 other contexts)
Missing class horizonos.app.container.TaskContainerManager (referenced from: horizonos.app.container.TaskContainer com.meta.spatial.runtime.PanelDisplay.tryGetTaskContainer(android.content.Context, android.content.Context))
Missing class vros.os.VrosBuild (referenced from: horizonos.app.container.TaskContainer com.meta.spatial.runtime.PanelDisplay.tryGetTaskContainer(android.content.Context, android.content.Context))
The missing_rules.txt file suggests adding the following rules to proguard-rules.pro:
# Please add these rules to your existing keep rules in order to suppress warnings.
# This is generated automatically by the Android Gradle plugin.
-dontwarn horizonos.app.container.TaskContainer
-dontwarn horizonos.app.container.TaskContainerManager$TaskContainerCallback
-dontwarn horizonos.app.container.TaskContainerManager
-dontwarn vros.os.VrosBuild
When I add these -dontwarn rules to proguard-rules.pro, the signed APK builds successfully. However, when I deploy and launch the APK on a Meta Quest device, the app gets stuck in a loading state and eventually shows a "Not Responding" error after some time.
I’ve also tried the following keep rules in proguard-rules.pro, but they prevent the APK from building:
-keep class horizonos.** { *; }
-keep class vros.** { *; }
-keep class com.meta.spatial.** { *; }
My question: What specific keep rules should I use in proguard-rules.pro to ensure that the necessary classes are preserved, allowing the app to build successfully and load properly on Meta Quest without getting stuck in the loading state?