Android R8不会混淆类名

Question

过去的几个小时我一直在研究此事，但没有任何运气。无论如何都不会混淆类名。这些只是常规类，不是Activity，Service或Android Manifest中的其他类（我知道这些不会被混淆）。我在这里想念什么？

Android Gradle Plugin version: 4.0.0
Gradle version: 6.1.1
Android Studio version: 4.0

对于这些版本，R8 should be enabled by default。这是我的buildType配置：

buildTypes {
    release {
        //useProguard false // even tried this without luck
        minifyEnabled true
        shrinkResources true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        signingConfig signingConfigs.release
    }
}

这里是我的proguard-rules.pro

-ignorewarnings

# --- Glide ---
-keep public class * implements com.bumptech.glide.module.GlideModule
-keep public class * extends com.bumptech.glide.module.AppGlideModule
-keep public enum com.bumptech.glide.load.ImageHeaderParser$** {
  **[] $VALUES;
  public *;
}

# --- Billing library ---
-keep class com.android.vending.billing.**

# --- Retrofit2 ---
# Retrofit does reflection on generic parameters. InnerClasses is required to use Signature and
# EnclosingMethod is required to use InnerClasses.
-keepattributes Signature, InnerClasses, EnclosingMethod

# Retrofit does reflection on method and parameter annotations.
-keepattributes RuntimeVisibleAnnotations, RuntimeVisibleParameterAnnotations

# Retain service method parameters when optimizing.
-keepclassmembers,allowshrinking,allowobfuscation interface * {
    @retrofit2.http.* <methods>;
}

# Ignore annotation used for build tooling.
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement

# Animal Sniffer compileOnly dependency to ensure APIs are compatible with older versions of Java.
-dontwarn org.codehaus.mojo.animal_sniffer.*

# Ignore JSR 305 annotations for embedding nullability information.
-dontwarn javax.annotation.**

# With R8 full mode, it sees no subtypes of Retrofit interfaces since they are created with a Proxy
# and replaces all potential values with null. Explicitly keeping the interfaces prevents this.
-if interface * { @retrofit2.http.* <methods>; }
-keep,allowobfuscation interface <1>

# --- TwitterKit ---
#Picasso Proguard Config https://github.com/square/picasso
-dontwarn com.squareup.okhttp.**

# --- GSON ---
# Gson uses generic type information stored in a class file when working with fields. Proguard
# removes such information by default, so configure it to keep all of it.
-keepattributes Signature

# For using GSON @Expose annotation
-keepattributes *Annotation*

# Gson specific classes
-dontwarn sun.misc.**
#-keep class com.google.gson.stream.** { *; }

# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { <fields>; }

# Prevent proguard from stripping interface information from TypeAdapter, TypeAdapterFactory,
# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
-keep class * implements com.google.gson.TypeAdapter
-keep class * implements com.google.gson.TypeAdapterFactory
-keep class * implements com.google.gson.JsonSerializer
-keep class * implements com.google.gson.JsonDeserializer

# Prevent R8 from leaving Data object members always null
-keepclassmembers,allowobfuscation class * {
  @com.google.gson.annotations.SerializedName <fields>;
}

# --- SciChart ---
# ignore warnings and save classes required for syntax highlighting
-dontwarn java.awt.**
-dontwarn javax.swing.**
-dontwarn syntaxhighlight.**

-keep public class java.awt.** { *; }
-keep public class javax.swing.** { *; }
-keep public class syntaxhighlight.** { *; }
-keep public class prettify.** { *; }

# need to keep these classes and their methods because they are used by resampling code
-keep public class com.scichart.core.model.DoubleValues { *; }
-keep public class com.scichart.core.model.FloatValues { *; }
-keep public class com.scichart.core.model.IntegerValues { *; }
-keep public class com.scichart.data.model.Point2DSeries { *; }

# repack obfuscated classes into single package so it would be hard to find their originall package
-repackageclasses ''
-allowaccessmodification

我检查了类似的问题，但未对此提供任何解决方案：

• Android studio 3.4.2 R8 obfuscator does not obfuscate class names, but only java code inside
• Class no longer obfuscated after upgrading to Android Gradle plugin 3.4.0
• Android/java: Transition / Migration from ProGuard to R8?

Answer 1

根据WorkManager's proguard file，应该保留所有扩展ListenableWorker的类（及其子类，例如Worker）。这是因为类的名称是WorkManager的内部数据库中的唯一键。