Problem

GSON混淆后执行错误 java.lang.ClassCastException:
com.google.gson.internal.LinkedTreeMap cannot be cast to

Solution

I read from gson source through https://github.com/google/gson/blob/master/examples/android-proguard-example/proguard.cfg,
here is the content.

##—————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.*
{ ; }

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

总结一下

1. 是不要混淆GsonJar包中的类
2. 实现
   java.io.Serializable的实体类中所有的属性名称也不能被混淆。
3. 以及为了序列化和反序列化，writeObject(); readObject();
   writeReplace(); readResolve();亦不可被混淆

Related Resource

http://xiaodongdong.blog.51cto.com/7049299/1353704 
编写Android Proguard
File