Add proguard rules into kotlin-android samples

Co-authored-by: Filipe Pereira <fpereira@yelp.com>

samples/kotlin-android-with-moshi-kotlin-codegen/build.gradle.kts

@@ -13,6 +13,12 @@ android {
         versionCode = 1
         versionName = "1.0"
     }
+    buildTypes {
+        getByName("release") {
+            isMinifyEnabled = true
+            proguardFiles("moshi.pro")
+        }
+    }
 }
 
 dependencies {

samples/kotlin-android-with-moshi-kotlin-codegen/moshi.pro

@@ -0,0 +1,65 @@
+# Original copy on:
+# * moshi: https://github.com/square/moshi/blob/moshi-parent-1.9.2/kotlin/reflect/src/main/resources/META-INF/proguard/moshi-kotlin.pro
+
+############################ moshi #####################################
+# JSR 305 annotations are for embedding nullability information.
+-dontwarn javax.annotation.**
+
+-keepclasseswithmembers class * {
+    @com.squareup.moshi.* <methods>;
+}
+
+-keep @com.squareup.moshi.JsonQualifier interface *
+
+# Enum field names are used by the integrated EnumJsonAdapter.
+# values() is synthesized by the Kotlin compiler and is used by EnumJsonAdapter indirectly
+# Annotate enums with @JsonClass(generateAdapter = false) to use them with Moshi.
+-keepclassmembers @com.squareup.moshi.JsonClass class * extends java.lang.Enum {
+    <fields>;
+    **[] values();
+}
+
+# The name of @JsonClass types is used to look up the generated adapter.
+-keepnames @com.squareup.moshi.JsonClass class *
+
+# Retain generated target class's synthetic defaults constructor and keep DefaultConstructorMarker's
+# name. We will look this up reflectively to invoke the type's constructor.
+#
+# We can't _just_ keep the defaults constructor because Proguard/R8's spec doesn't allow wildcard
+# matching preceding parameters.
+-keepnames class kotlin.jvm.internal.DefaultConstructorMarker
+-keepclassmembers @com.squareup.moshi.JsonClass @kotlin.Metadata class * {
+    synthetic <init>(...);
+}
+
+# Retain generated JsonAdapters if annotated type is retained.
+-if @com.squareup.moshi.JsonClass class *
+-keep class <1>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*
+-keep class <1>_<2>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*$*
+-keep class <1>_<2>_<3>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*$*$*
+-keep class <1>_<2>_<3>_<4>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*$*$*$*
+-keep class <1>_<2>_<3>_<4>_<5>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*$*$*$*$*
+-keep class <1>_<2>_<3>_<4>_<5>_<6>JsonAdapter {
+    <init>(...);
+    <fields>;
+}

samples/kotlin-android/build.gradle.kts

@@ -12,6 +12,12 @@ android {
         versionCode = 1
         versionName = "1.0"
     }
+    buildTypes {
+        getByName("release") {
+            isMinifyEnabled = true
+            proguardFiles("moshi.pro")
+        }
+    }
 }
 
 dependencies {

samples/kotlin-android/moshi.pro

@@ -0,0 +1,73 @@
+# Original copies on:
+# * kotlin/reflect: https://github.com/square/moshi/blob/moshi-parent-1.9.2/moshi/src/main/resources/META-INF/proguard/moshi.pro
+# * moshi: https://github.com/square/moshi/blob/moshi-parent-1.9.2/kotlin/reflect/src/main/resources/META-INF/proguard/moshi-kotlin.pro
+
+############################ kotlin/reflect ############################
+-keep class kotlin.reflect.jvm.internal.impl.builtins.BuiltInsLoaderImpl
+
+-keepclassmembers class kotlin.Metadata {
+    public <methods>;
+}
+
+############################ moshi #####################################
+# JSR 305 annotations are for embedding nullability information.
+-dontwarn javax.annotation.**
+
+-keepclasseswithmembers class * {
+    @com.squareup.moshi.* <methods>;
+}
+
+-keep @com.squareup.moshi.JsonQualifier interface *
+
+# Enum field names are used by the integrated EnumJsonAdapter.
+# values() is synthesized by the Kotlin compiler and is used by EnumJsonAdapter indirectly
+# Annotate enums with @JsonClass(generateAdapter = false) to use them with Moshi.
+-keepclassmembers @com.squareup.moshi.JsonClass class * extends java.lang.Enum {
+    <fields>;
+    **[] values();
+}
+
+# The name of @JsonClass types is used to look up the generated adapter.
+-keepnames @com.squareup.moshi.JsonClass class *
+
+# Retain generated target class's synthetic defaults constructor and keep DefaultConstructorMarker's
+# name. We will look this up reflectively to invoke the type's constructor.
+#
+# We can't _just_ keep the defaults constructor because Proguard/R8's spec doesn't allow wildcard
+# matching preceding parameters.
+-keepnames class kotlin.jvm.internal.DefaultConstructorMarker
+-keepclassmembers @com.squareup.moshi.JsonClass @kotlin.Metadata class * {
+    synthetic <init>(...);
+}
+
+# Retain generated JsonAdapters if annotated type is retained.
+-if @com.squareup.moshi.JsonClass class *
+-keep class <1>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*
+-keep class <1>_<2>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*$*
+-keep class <1>_<2>_<3>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*$*$*
+-keep class <1>_<2>_<3>_<4>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*$*$*$*
+-keep class <1>_<2>_<3>_<4>_<5>JsonAdapter {
+    <init>(...);
+    <fields>;
+}
+-if @com.squareup.moshi.JsonClass class **$*$*$*$*$*
+-keep class <1>_<2>_<3>_<4>_<5>_<6>JsonAdapter {
+    <init>(...);
+    <fields>;
+}