Android studio 3.4.2 R8 obfuscator does not obfuscate class names, but only java code inside

问题

When I upgraded to the latest Gradle version, my class names are not being obfuscated anymore. The current studio version is 3.4.2

As the latest version uses R8 obfuscation instead of Proguard, I have removed the previous configuration of proguard-rules.pro as it does almost nothing at all.

I still use

buildTypes {
        release {
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

and inside proguard-rules.pro i left only this:

-allowaccessmodification
-repackageclasses

The result is somehow obfuscated java code inside classes, but preserved class names and when apply some reverse engineering all original class names are visible. Need some help with this R8 to make it work as desired. Thank you in advance!

来源：https://stackoverflow.com/questions/57369315/android-studio-3-4-2-r8-obfuscator-does-not-obfuscate-class-names-but-only-java