Update proguard-rules.pro

app/proguard-rules.pro

@@ -34,6 +34,31 @@
 -renamesourcefileattribute P
 -keepattributes SourceFile,LineNumberTable
 
+## ---------------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.
+
+# 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 * implements 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>;
+}
+
+## ---------------End: proguard configuration for Gson  ----------
+
 -assumenosideeffects class kotlin.jvm.internal.Intrinsics {
     public static *** throwUninitializedProperty(...);
     public static *** throwUninitializedPropertyAccessException(...);