Fix issues for release builds

gradle/libs.versions.toml

@@ -22,7 +22,7 @@ versionCode = "1"
 versionName = "1.0"
 
 [libraries]
-android-gradle = { module = "com.android.tools.build:gradle", version = "7.1.2"}
+android-gradle = { module = "com.android.tools.build:gradle", version = "7.2.1" }
 androidx-appcompat = { module = "androidx.appcompat:appcompat", version.ref = "androidx-appcompat" }
 androidx-core = { module = "androidx.core:core-ktx", version.ref = "androidx-core" }
 androidx-splash = { module = "androidx.core:core-splashscreen", version.ref = "androidx-splash" }

shared/build.gradle.kts

@@ -60,4 +60,9 @@ android {
         sourceCompatibility = JavaVersion.VERSION_1_8
         targetCompatibility = JavaVersion.VERSION_1_8
     }
+    buildTypes {
+        release {
+            consumerProguardFiles("proguard-rules.pro")
+        }
+    }
 }

shared/proguard-rules.pro

@@ -0,0 +1,26 @@
+-keepattributes SourceFile,LineNumberTable
+
+-if @kotlinx.serialization.Serializable class **
+-keepclassmembers class <1> {
+    static <1>$Companion Companion;
+}
+
+# Keep `serializer()` on companion objects (both default and named) of serializable classes.
+-if @kotlinx.serialization.Serializable class ** {
+    static **$* *;
+}
+-keepclassmembers class <2>$<3> {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# Keep `INSTANCE.serializer()` of serializable objects.
+-if @kotlinx.serialization.Serializable class ** {
+    public static ** INSTANCE;
+}
+-keepclassmembers class <1> {
+    public static <1> INSTANCE;
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# @Serializable and @Polymorphic are used at runtime for polymorphic serialization.
+-keepattributes RuntimeVisibleAnnotations,AnnotationDefault

shared/src/androidMain/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.wbrawner.pihelper">
+    package="com.wbrawner.pihelper.shared">
 
     <uses-permission android:name="android.permission.INTERNET" />
 </manifest>