java Gson嵌套类在使用proguard时为空

Question

警告：class'com。谷歌。格森。内部的绑定ReflectTypeAdapterFactory'正在调用类。类上的getDeclaredFields

启用proguard后，发现以下提到的一些问题：

1. 嵌套的静态类为空
2. 类中自定义对象的列表为空

已引用以下错误，但运气不佳：

Proguard issue while using GSON Using GSON with proguard enabled

Answer 1

我可以通过对我的proguard-rules.pro文件执行三项操作来解决此问题：

首先，确保ProGuard不会更改用Gson序列化的任何自定义类的名称。假设您有一个名为Classname的类。若要豁免，请将此项添加到progaurd-rules.pro：

-keepclassmembernames class com.your.package.classname { <fields>; }

（用实际的包和类名替换com.your.package.classname）

我得上十几节课。别忘了豁免这些类的任何自定义成员变量。用classname$innerclass而不是classname豁免内部类

第二步，添加Gson库建议的规则They can be found here.在这里，他们是作为书面：

##       -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
-dontwarn sun.misc.**
#-keep class com.google.gson.stream.** { *; }

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

# Prevent proguard from stripping interface information from TypeAdapter, TypeAdapterFactory,
# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
-keep class * extends com.google.gson.TypeAdapter
-keep class * implements com.google.gson.TypeAdapterFactory
-keep class * implements com.google.gson.JsonSerializer
-keep class * implements com.google.gson.JsonDeserializer

# Prevent R8 from leaving Data object members always null
-keepclassmembers,allowobfuscation class * {
  @com.google.gson.annotations.SerializedName <fields>;
}

# Retain generic signatures of TypeToken and its subclasses with R8 version 3.0 and higher.
-keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
-keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken

##       -End: proguard configuration for Gson       

最后，添加以下两条规则：

-dontwarn java.lang.reflect.**
-keep class kotlin.** { *; }

当然，在我完成了上述步骤之后，这些就是我修复嵌套的null问题的方法