Dive into Kotlin Delegation implementation to solve the obfuscation issue
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This document discusses implementing Kotlin delegation and solving Proguard issues. It provides two solutions to an issue where the "No BuiltInsLoader implementation was found" exception is thrown after Proguard strips metadata files. Solution 1 is to add the kotlin-reflection library, which increases APK size by 100KB. Solution 2 is to add a new Proguard rule to exclude kotlin library classes and metadata files from being stripped. The document also provides references to related issues and hiring opportunities.
Dive into Kotlin Delegation implementation to solve the obfuscation issue
- 1. 探討Kotlin Delegation實作 以及解決Proguard問題 Prada - PicCollage
- 4. Live Demo - Crash
- 5. Issue Fatal Exception: java.lang.IllegalStateException: No BuiltInsLoader implementation was found. Please ensure that the META-INF/services/ is not stripped from your application and that the Java virtual machine is not running under a security manager at kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoader$Companion$Instance$2.invoke(SourceFile:39) at kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoader$Companion$Instance$2.invoke(SourceFile:36) at kotlin.SafePublicationLazyImpl.getValue(SourceFile:107) at kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoader$Companion.getInstance(SourceFile) at kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns.createBuiltInsModule(SourceFile:148) at kotlin.reflect.jvm.internal.impl.platform.JvmBuiltIns.(SourceFile:56) at kotlin.reflect.jvm.internal.impl.platform.JvmBuiltIns.(SourceFile:31) at kotlin.reflect.jvm.internal.components.RuntimeModuleData$Companion.create(SourceFile:58)
- 7. ServiceLoader https://docs.oracle.com/javase/7/docs/api/java/util/ServiceLoader.html
- 8. Solution 1/3 • Add kotlin-reflection library into build.gradle • implementation org.jetbrains.kotlin:kotlin-reflect:$KOTLIN_VER • APK size will increases around 100KB
- 9. Solution 2/3 • Add New Proguard rule for kotlin library https://gist.github.com/bearprada/6c206092d5295bfdb43b0caa56604c46
- 10. Solution 2/3 • Add Proguard rule for our app <- value types