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I've been going through this issue for two days now. I've built my Release APK successfully, but when I tested this APK in a device, I got this exception:

java.lang.VerifyError: Verifier rejected class m.a due to bad method void m.a.a(android.support.v4.app.Fragment, int, int) (declaration of 'm.a' appears in /data/app/com.picmix.mobile-1/base.apk)
    at m.a.e(outline)
    at a.b.g.a.<clinit>(SourceFile:7)
    at a.b.g.b.attachBaseContext(SourceFile:2)
    at android.app.Application.attach(Application.java:187)
    at android.app.Instrumentation.newApplication(Instrumentation.java:996)
    at android.app.Instrumentation.newApplication(Instrumentation.java:980)
    at android.app.LoadedApk.makeApplication(LoadedApk.java:582)
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4766)
    at android.app.ActivityThread.access$1900(ActivityThread.java:152)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1402)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5538)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

I've traced this m.a in the proguard mappings.txt file generated in the build folders, and apparently it points to r8.GeneratedOutlineSupport.

Every other search result for m.a points to that in the middle of the class path, not the entire class path. So, if I'm not mistaken, this means a part of the code/resource shrinker is going to generate that error.

What is this GeneratedOutlineSupport in the first place, and should I just put -keep r8.GeneratedOutlineSupport.* or something alike as a workaround?

EDIT: I suppose I can just use Proguard for the time being.

Gensoukyou1337
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  • This looks like an issue with R8. I have opened https://issuetracker.google.com/117478281. Do you have a reproduction that you can share? Either full project or just the failing APK that we can take a look at? – sgjesse Oct 09 '18 at 11:24
  • I also had a verification crash when enabling R8. Maybe this is helpful to you: https://issuetracker.google.com/issues/132314166 – Ostkontentitan May 10 '19 at 12:28

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