Howto configure ProGuard settings for ButterKnife 8?

Question

I am running ButterKnife version 8.5.1 in my Android app. If I try to make ProGuard settings for ButterKnife I still got crashes in my release version. There is an issue on the official ButterKnife Github page which tells you to make the following settings:

-keep class butterknife.** { *; }
-dontwarn butterknife.internal.**
-keep class **$$ViewBinder { *; }

-keepclasseswithmembernames class * {
     @butterknife.* <fields>;
}

-keepclasseswithmembernames class * {
    @butterknife.* <methods>;
}

Alternatively it is written to use these settings:

# Butterknife
-dontwarn butterknife.internal.**
-keep class **$$ViewInjector { *; }
-keepnames class * { @butterknife.InjectView *;}

None of these work with my configuration. I still got crashes when accessing Views bound by ButterKnife. So are there any new settings which you need to make for ButterKnife 8?

Answer 1

In ButterKnife 8 the auto generated Subclasses are called different. You can handle ProGuard settings for Version 7 and 8 this way:

###---------------Begin: proguard configuration for ButterKnife  ----------
# For Butterknife:
-keep class butterknife.** { *; }
-dontwarn butterknife.internal.**

# Version 7
-keep class **$$ViewBinder { *; }
# Version 8
-keep class **_ViewBinding { *; }

-keepclasseswithmembernames class * { @butterknife.* <fields>; }
-keepclasseswithmembernames class * { @butterknife.* <methods>; }
###---------------End: proguard configuration for ButterKnife  ----------

Although I am using @OnClick methods I even do not need the last line. These settings work perfect for me. Try it out!