Android Proguard, Keep Inner Class

How to configure ProGuard to keep names of inner class members?

I am pretty sure something like this should do the trick:

-keepclassmembernames class com.myapppackage.MyOuterClass$** { *; }

So please double check.
Testing showed that { *; } part is necessary. Although I cannot explain why.
Could someone with insight please elaborate.

How to keep Fields and Methods of Inner Class in Proguard (Not only the Class itself)

From the bytecode point of view, inner classes are ordinary classes; they only have ...$... names (and InnerClasses attributes, for the sake of reflection and compilers). ProGuard doesn't treat them differently. Your additional rules would therefore only match inner classes that have the annotation. The best solution I see at this time is to specify the main rule and then annotate the inner classes as well.

Background: the patterns in ProGuard's rules specify the elements that are matched and the elements that are kept as a result (with slight variations between -keep, -keepclassmembers, and -keepclasseswithmembers). You therefore can't specify "IF some class is matched THEN keep some other class". This is very rarely needed and rules can already be complex, but I am considering a more general extension.

Keep from R8 obfuscating: inner classes or interfaces, where outer class extends or implements

You should be able to use the following conditional keep rule:

-if class com.example.** implements io.foo.bar.MyInterface
-keep class com.example.<1>$*

If a class in package com.example implements io.foo.bar.MyInterface keep all its inner classes.

Proper Proguard configuration to keep static inner class

All of those should work (only Object -> java.lang.Object). You can check bin/proguard/seeds.txt to see if they are listed. Otherwise, you might be modifying the wrong configuration file, or there might be a typo in the names.

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