当使用proguard改装时,我得到以下异常(注意,没有Proguard一切正常)：

java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to com.path.to.my.model
        at com.path.to.my.callback.onResponse(Unknown Source)
        at retrofit.ExecutorCallAdapterFactory$ExecutorCallback$1.run(Unknown Source)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5351)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)

我的proguard文件如下：

-dontwarn okio.**
-dontwarn retrofit.**
-keep class retrofit.** { *; }
-keepattributes Signature
-keepattributes Exceptions

与我正在使用的Retrofit相关的依赖项是：

compile 'com.squareup.retrofit:retrofit:2.0.0-beta1'
compile 'com.squareup.retrofit:converter-gson:2.0.0-beta1'

为什么会这样？我怎样才能找到问题？故障排除方法非常有帮助.提前致谢！

解决方法:

检查以确保为gson配置了proguard.您需要确保与gson一起使用的POJO不会被混淆,并且注释不会被剥离.

注意：您应该替换com.google.gson.examples.android.model.** {*;在下面的示例中使用您的模型类.

来自gson example proguard配置 –

##---------------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  ----------