Proguard code trimming, with keep rules for uniffi/jna (#9)

* proguard (keep) rules for the win

* add documentation regarding a proguard keep rule syntax

* Add some documentation for keep rule

android/app/build.gradle.kts

@@ -13,8 +13,8 @@ android {
         applicationId = "alt.nainapps.sharepaste"
         minSdk = 26
         targetSdk = 34
-        versionCode = 1720700000
-        versionName = "2024.07.11"
+        versionCode = 1720956000
+        versionName = "2024.07.14"
         setProperty("archivesBaseName", "sharepaste.oo")
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
@@ -49,8 +49,8 @@ android {
 
     buildTypes {
         release {
-            isMinifyEnabled = false
-            isShrinkResources = false
+            isMinifyEnabled = true
+            isShrinkResources = true
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro"

android/app/proguard-rules.pro

@@ -21,3 +21,21 @@
 #-renamesourcefileattribute SourceFile
 
 -dontwarn org.gradle.api.Plugin
+# https://stackoverflow.com/a/14157641
+-keep class uniffi.pbcli.** { *; }
+-keepclasseswithmembernames,includedescriptorclasses class * {
+    native <methods>;
+}
+# https://stackoverflow.com/a/64553038
+-keep class com.sun.jna.** { *; }
+-keep class * implements com.sun.jna.** { *; }
+# These auto recommended rules are related to above
+# Please add these rules to your existing keep rules in order to suppress warnings.
+# This is generated automatically by the Android Gradle plugin.
+-dontwarn java.awt.Component
+-dontwarn java.awt.GraphicsEnvironment
+-dontwarn java.awt.HeadlessException
+-dontwarn java.awt.Window
+
+# I don't want to obfuscte code, just trim
+-dontobfuscate