Proguard obfuscating Annotations

Question

I need to keep all model classes to be unobfuscated, so I added this line in proguard rules to keep all model classes:

-keep class my_package_name.model.** { *; }

All model classes are getting kept by this command but still, it is obfuscating the annotations inside the Model classes. I tried adding the following line:

-keepattributes *Annotation*
-keepattributes EnclosingMethod

But still, results are same. My model classes contain these two annotations:

@SerializedName("message")
@Expose
private String message;

How can I keep the two annotations unobfuscated?

Answer 1

Try this:

-keepattributes *Annotation*
-keepattributes Signature
-dontnote sun.misc.**

-keep class * implements com.google.gson.TypeAdapterFactory
-keep class * implements com.google.gson.JsonSerializer
-keep class * implements com.google.gson.JsonDeserializer

Actually, there is a proguard config in official repo on github https://github.com/google/gson/blob/master/examples/android-proguard-example/proguard.cfg

Answer 2

Gson uses generic type information stored in a class file when working with fields. Proguard removes such information by default, so configure it to keep all of it.

Trying adding

-keepattributes Signature
-keepattributes EnclosingMethod
-keepattributes InnerClasses
-keepattributes Annotation

For using GSON @Expose annotation

-keepattributes *Annotation*

For Gson specific classes

-keep class sun.misc.Unsafe { *; }

Prevent proguard from stripping interface information from TypeAdapterFactory,JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)

-keep class * implements com.google.gson.TypeAdapterFactory
-keep class * implements com.google.gson.JsonSerializer
-keep class * implements com.google.gson.JsonDeserializer

Answer 3

-keep @package.annotationclassname public class *

Answer 4

The rule

-keep class com.google.gson.annotations.*

will keep all annotations in the package com.google.gson.annotations including the SerializedName and Expose ones that you have used.