android studio 3.5 Warning: The rule `-keep public class * extends androidx.versionedparcelable.VersionedParcelable { (); }` uses extends

Question

Today, I updated my Android Studio to 3.5. After updated, I found below warning when I try to run the app.

The rule -keep public class * extends androidx.versionedparcelable.VersionedParcelable { (); } uses extends but actually matches implements.

I know warning is related with my proguard rules. So, I double checked my proguard rule file, but I am sure I didn't add that rule and it is not in my proguard rule file.

Below is the warning when I build the project.

My project is using AndroidX. Can anyone know that warning can be skipped or where that warning came from? Any ideas or alternative ways will be appreciating..

that's because `VersionedParcelable` is an `interface`, which can be only implemented, not extended. Are you using the default proguard rules file in addition to your one? — Vladyslav Matviienko, Aug 22 '19 at 04:41
can you show the line in your build.gradle where you are using your own proguard rules file? — Vladyslav Matviienko, Aug 22 '19 at 05:00
@Vladyslav, please see below link https://drive.google.com/file/d/1irtc0DhMIlUl02moCbbWt2wqPXiH6W0A/view?usp=sharing — ZarNi Myo Sett Win, Aug 22 '19 at 05:11
you are using the default proguard file `getDefaultProguardFile(..)`. It has some proguard rules too. This line is likely from it — Vladyslav Matviienko, Aug 22 '19 at 05:13
@VladyslavMatviienko,can I know the problem is bcoz of defaultProgurardFile()? — ZarNi Myo Sett Win, Aug 22 '19 at 05:16
@VladyslavMatviienko. Thank you. But, can I know default progurad file is the progurard file that I showed in question? Is itn't? — ZarNi Myo Sett Win, Aug 22 '19 at 05:22
no, it is `proguard-android.txt` located somewhere in Android SDK dir — Vladyslav Matviienko, Aug 22 '19 at 05:24
`getDefaultProguardFile` loads the default proguard rules file located in Android SDK directory in addition to your custom rules file — Vladyslav Matviienko, Aug 22 '19 at 05:28
now I understood. Thank you. But, let me know, if we use progurard, can we drop default progurad? or just add addition? — ZarNi Myo Sett Win, Aug 22 '19 at 05:35
I personally don't use default one. You can use `proguardFile 'proguard-rules.pro' instead of that line — Vladyslav Matviienko, Aug 22 '19 at 05:36

sagis · Accepted Answer · 2019-08-25T03:36:45.530

It's a bug in the proguard.txt file in the versionedparcelable.aar version 1.0.0. This was fixed in version 1.1.0, however, if you're not using libraries that depends on the new version you'll get this warning in Android Studio 3.5.

In version 1.0.0 the proguard.txt file includes the following line:

-keep public class * extends androidx.versionedparcelable.VersionedParcelable

This was fixed in version 1.1.0:

-keep public class * implements androidx.versionedparcelable.VersionedParcelable

To bypass this issue you can force using the latest version by adding the following line to your build.gradle:

implementation "androidx.versionedparcelable:versionedparcelable:1.1.0"

score 1 · Answer 2 · answered Dec 19 '19 at 18:58

1

Why not do this for that project:

Disable minify in "build.gradle (Module: app)" file:

minifyEnabled false

and you use proguard for optimization, such as:

proguardFiles getDefaultProguardFile ('proguard-android-optimize.txt')

answered Dec 19 '19 at 18:58

Bokili Production

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Too, You can update to `compileSdkVersion 29` and migrate to AndrodX. This is the best solution. – Bokili Production Dec 21 '19 at 21:54
Yes, but that was a fast and easy solution then.Agree? – Bokili Production Jan 19 '21 at 16:07

android studio 3.5 Warning: The rule `-keep public class * extends androidx.versionedparcelable.VersionedParcelable { (); }` uses extends

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