Google Gson 保留通用签名

Question

Firebase Crashlytics 中出现崩溃，并附有如何解决问题的注释：

致命异常：java.lang.IllegalStateException：必须使用类型参数创建 TypeToken：new TypeToken<...>() {}; 使用代码压缩器（ProGuard、R8...）时，请确保保留通用签名。

我的尖括号 <...> 之间的通用类名为ApiResponse。我用jsonschema2pojo创建它。

Answer 1

需要排除 Gson 上的序列化/反序列化类。对于包含您的类的包，如下所示

# Application classes that will be serialized/deserialized over Gson
-keep class com.myapplication.model.api.** { *; }

还要添加这个

# Gson uses generic type information stored in a class file when working with
# fields. Proguard removes such information by default, keep it.
-keepattributes Signature

# This is also needed for R8 in compat mode since multiple 
# optimizations will remove the generic signature such as class 
# merging and argument removal. See: 
# https://r8.googlesource.com/r8/+/refs/heads/main/compatibility-faq.md#troubleshooting-gson-gson
-keep class com.google.gson.reflect.TypeToken { *; }
-keep class * extends com.google.gson.reflect.TypeToken

# Optional. For using GSON @Expose annotation
-keepattributes AnnotationDefault,RuntimeVisibleAnnotations