Add Proguard-Rules for retrofit2 and gson

app/build.gradle

@@ -92,7 +92,7 @@ android {
             debuggable false
             minifyEnabled true
             shrinkResources false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro', 'retrofit2.pro', 'gson.pro'
             signingConfig signingConfigs.release
             manifestPlaceholders = [branchMode: 'false']
         }

app/gson.pro

@@ -0,0 +1,72 @@
+### Gson ProGuard and R8 rules which are relevant for all users
+### This file is automatically recognized by ProGuard and R8, see https://developer.android.com/build/shrink-code#configuration-files
+###
+### IMPORTANT:
+### - These rules are additive; don't include anything here which is not specific to Gson (such as completely
+###   disabling obfuscation for all classes); the user would be unable to disable that then
+### - These rules are not complete; users will most likely have to add additional rules for their specific
+###   classes, for example to disable obfuscation for certain fields or to keep no-args constructors
+###
+
+# Keep generic signatures; needed for correct type resolution
+-keepattributes Signature
+
+# Keep Gson annotations
+# Note: Cannot perform finer selection here to only cover Gson annotations, see also https://stackoverflow.com/q/47515093
+-keepattributes RuntimeVisibleAnnotations,AnnotationDefault
+
+### The following rules are needed for R8 in "full mode" which only adheres to `-keepattribtues` if
+### the corresponding class or field is matches by a `-keep` rule as well, see
+### https://r8.googlesource.com/r8/+/refs/heads/main/compatibility-faq.md#r8-full-mode
+
+# Keep class TypeToken (respectively its generic signature) if present
+-if class com.google.gson.reflect.TypeToken
+-keep,allowobfuscation class com.google.gson.reflect.TypeToken
+
+# Keep any (anonymous) classes extending TypeToken
+-keep,allowobfuscation class * extends com.google.gson.reflect.TypeToken
+
+# Keep classes with @JsonAdapter annotation
+-keep,allowobfuscation,allowoptimization @com.google.gson.annotations.JsonAdapter class *
+
+# Keep fields with any other Gson annotation
+# Also allow obfuscation, assuming that users will additionally use @SerializedName or
+# other means to preserve the field names
+-keepclassmembers,allowobfuscation class * {
+  @com.google.gson.annotations.Expose <fields>;
+  @com.google.gson.annotations.JsonAdapter <fields>;
+  @com.google.gson.annotations.Since <fields>;
+  @com.google.gson.annotations.Until <fields>;
+}
+
+# Keep no-args constructor of classes which can be used with @JsonAdapter
+# By default their no-args constructor is invoked to create an adapter instance
+-keepclassmembers class * extends com.google.gson.TypeAdapter {
+  <init>();
+}
+-keepclassmembers class * implements com.google.gson.TypeAdapterFactory {
+  <init>();
+}
+-keepclassmembers class * implements com.google.gson.JsonSerializer {
+  <init>();
+}
+-keepclassmembers class * implements com.google.gson.JsonDeserializer {
+  <init>();
+}
+
+# Keep fields annotated with @SerializedName for classes which are referenced.
+# If classes with fields annotated with @SerializedName have a no-args
+# constructor keep that as well. Based on
+# https://issuetracker.google.com/issues/150189783#comment11.
+# See also https://github.com/google/gson/pull/2420#discussion_r1241813541
+# for a more detailed explanation.
+-if class *
+-keepclasseswithmembers,allowobfuscation class <1> {
+  @com.google.gson.annotations.SerializedName <fields>;
+}
+-if class * {
+  @com.google.gson.annotations.SerializedName <fields>;
+}
+-keepclassmembers,allowobfuscation,allowoptimization class <1> {
+  <init>();
+}

app/retrofit2.pro

@@ -0,0 +1,48 @@
+# Retrofit does reflection on generic parameters. InnerClasses is required to use Signature and
+# EnclosingMethod is required to use InnerClasses.
+-keepattributes Signature, InnerClasses, EnclosingMethod
+
+# Retrofit does reflection on method and parameter annotations.
+-keepattributes RuntimeVisibleAnnotations, RuntimeVisibleParameterAnnotations
+
+# Keep annotation default values (e.g., retrofit2.http.Field.encoded).
+-keepattributes AnnotationDefault
+
+# Retain service method parameters when optimizing.
+-keepclassmembers,allowshrinking,allowobfuscation interface * {
+    @retrofit2.http.* <methods>;
+}
+
+# Ignore annotation used for build tooling.
+-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
+
+# Ignore JSR 305 annotations for embedding nullability information.
+-dontwarn javax.annotation.**
+
+# Guarded by a NoClassDefFoundError try/catch and only used when on the classpath.
+-dontwarn kotlin.Unit
+
+# Top-level functions that can only be used by Kotlin.
+-dontwarn retrofit2.KotlinExtensions
+-dontwarn retrofit2.KotlinExtensions$*
+
+# With R8 full mode, it sees no subtypes of Retrofit interfaces since they are created with a Proxy
+# and replaces all potential values with null. Explicitly keeping the interfaces prevents this.
+-if interface * { @retrofit2.http.* <methods>; }
+-keep,allowobfuscation interface <1>
+
+# Keep inherited services.
+-if interface * { @retrofit2.http.* <methods>; }
+-keep,allowobfuscation interface * extends <1>
+
+# With R8 full mode generic signatures are stripped for classes that are not
+# kept. Suspend functions are wrapped in continuations where the type argument
+# is used.
+-keep,allowobfuscation,allowshrinking class kotlin.coroutines.Continuation
+
+# R8 full mode strips generic signatures from return types if not kept.
+-if interface * { @retrofit2.http.* public *** *(...); }
+-keep,allowoptimization,allowshrinking,allowobfuscation class <3>
+
+# With R8 full mode generic signatures are stripped for classes that are not kept.
+-keep,allowobfuscation,allowshrinking class retrofit2.Response

navi-hl/proguard-rules.pro

@@ -18,4 +18,6 @@
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
-#-renamesourcefileattribute SourceFile
+#-renamesourcefileattribute SourceFile
+
+-dontwarn com.navi.naviwidgets.R$layout