java.lang.VerifyError after upgrading from 1.1.0-alpha06 to 1.1.0-alpha07

[yccheok]

After upgrading from com.google.android.material:material:1.1.0-alpha06 to com.google.android.material:material:1.1.0-alpha07, we are getting the following error. It happens in Android 4.3 and Android 4.4 so far.

java.lang.VerifyError: 
  at com.google.android.material.tabs.TabLayout.createTabFromPool (TabLayout.java:862)
  at com.google.android.material.tabs.TabLayout.newTab (TabLayout.java:852)
  at com.google.android.material.tabs.TabLayout.populateFromPagerAdapter (TabLayout.java:1474)
  at com.google.android.material.tabs.TabLayout.setPagerAdapter (TabLayout.java:1465)
  at com.google.android.material.tabs.TabLayout.setupWithViewPager (TabLayout.java:1378)
  at com.google.android.material.tabs.TabLayout.setupWithViewPager (TabLayout.java:1339)
  at com.google.android.material.tabs.TabLayout.setupWithViewPager (TabLayout.java:1319)
  at com.yocto.wenote.note.NoteFragment.initTabs (NoteFragment.java:343)
  at com.yocto.wenote.note.NoteFragment.lambda$onCreateView$1 (NoteFragment.java:199)

This is the code being called just before entering com.google.android.material.tabs.TabLayout

tabLayout.setupWithViewPager(viewPager);

It happens in line 862. (Left side is alpha07, right side is alpha06)

Any idea why such incident happens?

[yccheok]

We somehow workaround this problem by adding the following for R8

# VerifyError in Android 4
# https://github.com/material-components/material-components-android/issues/397
-keep class com.google.android.material.tabs.TabLayout$Tab {
*;
}

No crash so far. But, why this is required?

[cristh18]

We somehow workaround this problem by adding the following for R8

Hi @yccheok how are you? I have this issue on my app but I have not could reproduce it.

I think that is the same issue that you had. Would you think that your solution work for me?

[yccheok]

Yes. I can easily reproduce the problem using Android 4. I believe you can "workaround" the problem, with the method I mentioned above.

[cristh18]

@yccheok Thank you so much... I'll do tests with your solution. I'll hope that works.

[yccheok]

Your crash analysis looks interesting. May I know is that a paid service?

[cristh18]

@yccheok I use https://fabric.io/home and is free

[ItzNotABug]

facing the same issue..
I also tried @yccheok's solution, still getting crashes on 4.x devices

Edit: Its working, I forgot to specify the proguard file in build.gradle

[HaydenCampbell]

Also receiving this error on Android 4.4, 4.1, 4.2, 4.3 and 5.01. Will try the workaround.

[xDragonZ]

this error occur on API 18 and 19 with alpha07, alpha08 and alpha09

fixed by adding, TabLayout$Tab to proguard

[drchen]

I'm going to close this issue since it seems something beyond our control and we have a known workaround.