chore(android): enable R8 shrinker with keep rules, set up release signing, and strip sourcemaps from APK

android/app/build.gradle

@@ -20,12 +20,6 @@ android {
             ignoreAssetsPattern = '!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~'
         }
     }
-    buildTypes {
-        release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
-        }
-    }
     // AGP 8+ requires explicit opt-in for BuildConfig generation. We rely on
     // BuildConfig.DEBUG to gate Log.d calls that dump privacy-sensitive
     // identifiers (roomId, eventId) so release builds don't leak them through
@@ -33,6 +27,26 @@ android {
     buildFeatures {
         buildConfig = true
     }
+
+    signingConfigs {
+        release {
+            if (project.hasProperty('VOJO_RELEASE_STORE_FILE')) {
+                storeFile file(VOJO_RELEASE_STORE_FILE)
+                storePassword VOJO_RELEASE_STORE_PASSWORD
+                keyAlias VOJO_RELEASE_KEY_ALIAS
+                keyPassword VOJO_RELEASE_KEY_PASSWORD
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled true
+            shrinkResources true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            signingConfig signingConfigs.release
+        }
+    }
 }
 
 repositories {

android/app/proguard-rules.pro

@@ -19,3 +19,27 @@
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
+
+# Keep custom app classes — entry points invoked by Android system (Intents,
+# FCM, AndroidManifest references) or by JS bridge via reflection.
+-keep class chat.vojo.app.MainActivity { *; }
+-keep class chat.vojo.app.VojoFirebaseMessagingService { *; }
+-keep class chat.vojo.app.CallForegroundPlugin { *; }
+-keep class chat.vojo.app.CallForegroundService { *; }
+-keep class chat.vojo.app.CallDeclineReceiver { *; }
+-keep class chat.vojo.app.CallCancelReceiver { *; }
+-keep class chat.vojo.app.FullScreenIntentPlugin { *; }
+-keep class chat.vojo.app.LaunchSplashPlugin { *; }
+
+# Firebase Messaging — receivers/services resolved by Android via manifest.
+-keep public class * extends com.google.firebase.messaging.FirebaseMessagingService
+-keep class com.google.firebase.iid.** { *; }
+-keep class com.google.firebase.messaging.** { *; }
+
+# Capacitor — plugins discovered by annotation/reflection.
+-keep @com.getcapacitor.annotation.CapacitorPlugin class * { *; }
+-keep class com.getcapacitor.** { *; }
+-keep class com.getcapacitor.plugin.** { *; }
+
+# AndroidX splashscreen — reflection paths.
+-keep class androidx.core.splashscreen.** { *; }

package.json

@@ -19,12 +19,13 @@
     "gen:push-strings": "node scripts/gen-push-strings.mjs",
     "android:sync": "npx cap sync android",
     "android:open": "npx cap open android",
+    "android:strip-sourcemaps": "find dist -name '*.map' -delete",
     "android:apk:debug": "cd android && ./gradlew assembleDebug",
     "android:apk:release": "cd android && ./gradlew assembleRelease",
     "android:aab:release": "cd android && ./gradlew bundleRelease",
-    "build:android:debug": "npm run build && npm run android:sync && npm run android:apk:debug",
-    "build:android:release": "npm run build && npm run android:sync && npm run android:apk:release",
-    "build:android:aab": "npm run build && npm run android:sync && npm run android:aab:release",
+    "build:android:debug": "npm run build && npm run android:strip-sourcemaps && npm run android:sync && npm run android:apk:debug",
+    "build:android:release": "npm run build && npm run android:strip-sourcemaps && npm run android:sync && npm run android:apk:release",
+    "build:android:aab": "npm run build && npm run android:strip-sourcemaps && npm run android:sync && npm run android:aab:release",
     "prepare": "husky install",
     "commit": "git-cz"
   },