android: enable R8

android/build.gradle.kts

@@ -53,7 +53,12 @@ android {
     }
     buildTypes.all { signingConfig = signingConfigs.getByName("release") }
   }
-  buildTypes { getByName("release") { isMinifyEnabled = false } }
+  buildTypes {
+    getByName("release") {
+      isMinifyEnabled = true
+      proguardFiles("proguard-android-optimize.txt", "proguard-rules.pro")
+    }
+  }
   compileOptions {
     sourceCompatibility = JavaVersion.VERSION_1_8
     targetCompatibility = JavaVersion.VERSION_1_8

android/proguard-android-optimize.txt

@@ -0,0 +1,36 @@
+-allowaccessmodification
+-dontpreverify
+-dontusemixedcaseclassnames
+-dontskipnonpubliclibraryclasses
+-verbose
+
+-keepattributes *Annotation*
+
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+
+-keepclassmembers class * implements android.os.Parcelable {
+  public static final ** CREATOR;
+}
+
+-keep class androidx.annotation.Keep
+
+-keep @androidx.annotation.Keep class * {*;}
+
+-keepclasseswithmembers class * {
+    @androidx.annotation.Keep <methods>;
+}
+
+-keepclasseswithmembers class * {
+    @androidx.annotation.Keep <fields>;
+}
+
+-keepclasseswithmembers class * {
+    @androidx.annotation.Keep <init>(...);
+}

android/proguard-rules.pro

@@ -0,0 +1,16 @@
+-keepattributes SourceFile,LineNumberTable
+-keepattributes RuntimeVisibleAnnotations,
+                RuntimeVisibleParameterAnnotations,
+                RuntimeVisibleTypeAnnotations,
+                AnnotationDefault
+-renamesourcefileattribute SourceFile
+# Retain the generic signature of retrofit2.Call until added to Retrofit.
+# Issue: https://github.com/square/retrofit/issues/3580.
+# Pull request: https://github.com/square/retrofit/pull/3579.
+-keep,allowobfuscation,allowshrinking class retrofit2.Call
+
+# Retain annotation default values for all annotations.
+# Required until R8 version >= 3.1.12-dev (expected in AGP 7.1.0-alpha4).
+-keep,allowobfuscation,allowshrinking @interface *
+
+-keep,allowobfuscation,allowshrinking class dev.msfjarvis.claw.android.** { *; }

build.gradle.kts

@@ -7,12 +7,17 @@ buildscript {
       url = uri("https://s01.oss.sonatype.org/content/repositories/snapshots/")
       content { includeModule("me.amanjeet.daggertrack", "dagger-track") }
     }
+    maven {
+      url = uri("https://storage.googleapis.com/r8-releases/raw")
+      content { includeModule("com.android.tools", "r8") }
+    }
   }
   dependencies {
     classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.10")
     classpath("com.android.tools.build:gradle:7.1.0-alpha02")
     classpath("com.diffplug.spotless:spotless-plugin-gradle:5.14.0")
     classpath("com.google.dagger:hilt-android-gradle-plugin:2.37")
+    classpath("com.android.tools:r8:3.1.13-dev")
     classpath("me.amanjeet.daggertrack:dagger-track:1.0.6-SNAPSHOT")
   }
 }