java - ProGuard 让 Gson 返回 LinkedTreeMap 而不是我的类型

Question

下面这行代码对我来说很正常:

val users: Array<Catalog> = com.google.gson.Gson().fromJson(data, Array<MyUserClass>::class.java)


但是当我启用 ProGuard 时，我得到这个错误:

java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to com.example.app.Models.MyModel

MyUserClass如下:

data class MyUserClass(var posts: List<UserPosts>)


所以 Gson 正确地使 users是MyUserClass - 但不是 MyUserClass是 UserPosts 的列表, 它最终成为 LinkedTreeMap 的列表

我已经尝试解决这个问题一段时间了，我找到的所有与此相关的答案都与泛型有关，但我没有使用泛型，而是将类直接传递给 Gson。

我现在完全迷路了，所以任何指导都将不胜感激

这是相关的 ProGuard 规则:

##---------------Begin: proguard configuration for Gson  ----------
# 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.
-keepattributes Signature

# For using GSON @Expose annotation
-keepattributes *Annotation*

# Gson specific classes
-keep class sun.misc.Unsafe { *; }
#-keep class com.google.gson.stream.** { *; }

# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }

-keep class com.example.Models.** { *; }

# 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
##---------------End: proguard configuration for Gson  ----------

-keep public class MyUserClass
-keep public class UserPosts

Answer 1

确保您的 proguard.cfg 包含所有规则:

    ##---------------Begin: proguard configuration for Gson  ----------
# 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.
-keepattributes Signature

# For using GSON @Expose annotation
-keepattributes *Annotation*

# Gson specific classes
-keep class sun.misc.Unsafe { *; }
#-keep class com.google.gson.stream.** { *; }

# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }

# 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

##---------------End: proguard configuration for Gson  ----------
-keep public class MyUserClass
-keep public class UserPosts