body params properties name change in signed APK

Question

I created an android application which I use retrofit as REST client.

when i install the app on a phone, the requests are sent without any problem, but when i'm building a signed APK, i don't know why the properties name change when sending the request

I have a class which contains a "phone" field, then the request body must be

{
    "phone": "123456"
}

but in the log, I see that the body turns into

{
    "a": "123456"
}

the problem occurs only in signed APK,

Any help please?

Answer 1

Quick Fix disable minifyEnabled to false.

release {
        minifyEnabled false
        ...
    }

OR

If you dont want your class members to be obfuscated then use SerializedName annotation provided by Gson. For example:

public class ClassNameHere
{
   @SerializedName("phone")
   public String phone;
     ...

}

Moreover, make sure you do add proper proguard configuration for Gson library too. For example:

##---------------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
-keep class com.mypackage.ClassNameHere.** { *; }
-keep class com.google.gson.examples.android.model.** { *; }
# 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 ----------

For more info read proguard rules