ProGuard: can't find referenced class com.google.android.gms.R

Question

After some updates in Android SDK manager I try make signed apk and get this:

ProGuard: [] Warning: com.google.android.gms.auth.GoogleAuthUtil: 
  can't find referenced class com.google.android.gms.R
ProGuard: [] Warning: com.google.android.gms.auth.GoogleAuthUtil: 
  can't find referenced class com.google.android.gms.R$string
...
etc.

If set -dontwarn com.google.android.gms.** compiling is OK. But after run I get error many reports like this (from many devices):

Caused by: android.view.InflateException: Binary XML file line #32: 
  Error inflating class com.google.android.gms.common.SignInButton

On my devices all ok. Before update I have not ProGuard warnings and all work perfectly. How it fix?

Answer 1

Although adding this to proguard-project.txt file works, it keeps all classes.

-keep class com.google.android.gms.** { *; }
-dontwarn com.google.android.gms.**

I prefer this, which makes apk file size much smaller:

-keep public class com.google.android.gms.* { public *; }
-dontwarn com.google.android.gms.**

Also note up to date Google Play Proguard notification here: http://developer.android.com/google/play-services/setup.html#Proguard

-keep class * extends java.util.ListResourceBundle {
    protected Object[][] getContents();
}

-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
    public static final *** NULL;
}

-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
    @com.google.android.gms.common.annotation.KeepName *;
}

-keepnames class * implements android.os.Parcelable {
    public static final ** CREATOR;
}

Answer 2

You need to ignore like you are compiling but you also need to keep the class so it can find it during runtime.

Add these two lines to your proguard configuration file:

-keep class com.google.android.gms.** { *; }
-dontwarn com.google.android.gms.**

Answer 3

I came across a similar issue and eventually discovered that I had updated the Google Play Services module however I hadn't re-added the module to my main module in Android Studio. Adding that back in resolved my issues.

Answer 4

If you use proguard, you need to keep some GMS (Google Play Services) classes. Hopefully they are annotated with @com.google.android.gms.common.annotation.KeepName.

# Proguard config for project using GMS

-keepnames @com.google.android.gms.common.annotation.KeepName class
    com.google.android.gms.**,
    com.google.ads.**

-keepclassmembernames class
    com.google.android.gms.**,
    com.google.ads.** {
    @com.google.android.gms.common.annotation.KeepName *;
}

# Called by introspection
-keep class
    com.google.android.gms.**,
    com.google.ads.**
    extends java.util.ListResourceBundle {
    protected java.lang.Object[][] getContents();
}


# This keeps the class name as well as the creator field, because the
# "safe parcelable" can require them during unmarshalling.
-keepnames class
    com.google.android.gms.**,
    com.google.ads.**
    implements android.os.Parcelable {
    public static final ** CREATOR;
}

# com.google.android.gms.auth.api.signin.SignInApiOptions$Builder
# references these classes but no implementation is provided.
-dontnote com.facebook.Session
-dontnote com.facebook.FacebookSdk
-keepnames class com.facebook.Session {}
-keepnames class com.facebook.FacebookSdk {}

# android.app.Notification.setLatestEventInfo() was removed in
# Marsmallow, but is still referenced (safely)
-dontwarn com.google.android.gms.common.GooglePlayServicesUtil