Material-components-android: [Snackbar] InflateException thrown on obfuscated builds

[pandulapeter]

Description: With ProGuard enabled (minifyEnabled and shrinkResources both true), the Snackbar component crashes with the following exception:

android.view.InflateException: Binary XML file line #1 in my.package.name:layout/mtrl_layout_snackbar_include: Binary XML file line #1 in my.package.name:layout/mtrl_layout_snackbar_include: Error inflating class x
    Caused by: android.view.InflateException: Binary XML file line #1 in my.package.name:layout/mtrl_layout_snackbar_include: Error inflating class x
    Caused by: java.lang.ClassNotFoundException: android.view.x
        at java.lang.Class.classForName(Native Method)
        at java.lang.Class.forName(Class.java:454)
        at android.view.LayoutInflater.createView(LayoutInflater.java:815)
        at android.view.LayoutInflater.createView(LayoutInflater.java:776)
        at android.view.LayoutInflater.onCreateView(LayoutInflater.java:913)
        at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:68)
        at android.view.LayoutInflater.onCreateView(LayoutInflater.java:930)
        at android.view.LayoutInflater.onCreateView(LayoutInflater.java:950)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1004)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:659)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:534)

Expected behavior: Showing a Snackbar should not crash.

Source code:
Snackbar.make(view, "text", Snackbar.LENGTH_SHORT).show()

Android API version: 28, 29

Material Library version: The issue is present both in "1.3.0-alpha03" and "1.2.1".

Device: Samsung Galaxy Note 10+, Google Pixel 3, OnePlus 5

[hunterstich]

Hey @pandulapeter ,

I can work on reproducing this on my end and see what's happening.

Have you explored any proguard keep rules with any success?

[pandulapeter]

Hi @hunterstich ,

I've experimented with keeping the com.google.android.material.snackbar.SnackbarContentLayout class as well as anything from com.google.android.material.snackbar.*, without luck. This issue is present on two different projects from our team, I didn't create a separate app just for testing it but it should be easy to reproduce. If it matters, the appCompatVersion is 1.2.0.

Thanks and let me know if I can help with anything!

[orionthewake]

Ran into this same issue. We worked around it for now by reverting to Gradle 6.1.1 and the 4.0.1 Android Gradle Plugin.

[VincentJoshuaET]

Any update for this?

[pandulapeter]

Can confirm what @orionthewake suggested, it seems to be related to the Gradle build tools version. I also reverted to 4.0.1, but colleagues of mine who don't have this problem are using the newer alpha versions. So maybe the issue only appears on 4.1.0.

[VincentJoshuaET]

https://androidstudio.googleblog.com/2020/11/android-studio-411-available.html

New AGP released, any chance this is fixed?

[pandulapeter]

I've tried both with plugin version 4.1.1 and 4.2.0-alpha16, same crash with both 😞

[VincentJoshuaET]

Still not fixed?

[VincentJoshuaET]

I am using the latest Android Studio 4.2 Beta 1 with plugin version 4.2.0-beta01 and it seems I do not have this crash anymore.

[pandulapeter]

Still crashing for me with plugin 4.2.0-beta01. Maybe some other configuration issue is interfering on my side, I'll give it a try on a brand new project.

[msesma]

For me it is crashing in release if I have minify enabled, even if the proguard file has the -dontobfuscate rule.

But if I try to debug it (isDebuggable = true) the app stop crashing.

Using plugin 4.1.1 Temporarily fixed downgrading to 4.0.1

[VincentJoshuaET]

It seems that I turned on isDebuggable on my release test build. Yeah still not fixed

[giacomoferretti]

Adding this to your proguard-rules.pro should fix the issue: -keep class com.google.android.material.snackbar.** { *; }

Maybe can be broken down to be more precise.

Tested with Gradle Plugin 7.0.0-alpha03