perf: reduce APK size - switch to audio-only FFmpeg, enable ProGuard, split APK by ABI

.github/workflows/release.yml

@@ -71,12 +71,18 @@ jobs:
         run: dart run flutter_launcher_icons
 
       - name: Build APK (Release)
-        run: flutter build apk --release
+        run: flutter build apk --release --split-per-abi
 
-      - name: Rename APK
+      - name: Rename APKs
         run: |
           VERSION=${{ steps.get_version.outputs.version }}
-          mv build/app/outputs/flutter-apk/app-release.apk build/app/outputs/flutter-apk/SpotiFLAC-${VERSION}-android.apk
+          cd build/app/outputs/flutter-apk
+          # Rename split APKs
+          mv app-arm64-v8a-release.apk SpotiFLAC-${VERSION}-arm64.apk || true
+          mv app-armeabi-v7a-release.apk SpotiFLAC-${VERSION}-arm32.apk || true
+          # Also rename universal if exists
+          mv app-release.apk SpotiFLAC-${VERSION}-universal.apk || true
+          ls -la
 
       - name: Upload APK artifact
         uses: actions/upload-artifact@v4
@@ -185,7 +191,8 @@ jobs:
             Download Spotify tracks in FLAC quality from Tidal, Qobuz & Amazon Music.
             
             ### Downloads
-            - **Android**: `SpotiFLAC-${{ needs.build-android.outputs.version }}-android.apk`
+            - **Android (arm64)**: `SpotiFLAC-${{ needs.build-android.outputs.version }}-arm64.apk` (recommended for most devices)
+            - **Android (arm32)**: `SpotiFLAC-${{ needs.build-android.outputs.version }}-arm32.apk` (for older devices)
             - **iOS**: `SpotiFLAC-${{ needs.build-android.outputs.version }}-ios-unsigned.ipa` (requires sideloading)
             
             ### Features

android/app/build.gradle.kts

@@ -29,13 +29,34 @@ android {
         versionCode = flutter.versionCode
         versionName = flutter.versionName
         multiDexEnabled = true
+        
+        // Only include arm64-v8a for smaller APK (most modern devices)
+        // Remove this line if you need to support older 32-bit devices
+        ndk {
+            abiFilters += listOf("arm64-v8a", "armeabi-v7a")
+        }
     }
 
     buildTypes {
         release {
             signingConfig = signingConfigs.getByName("debug")
-            isMinifyEnabled = false
-            isShrinkResources = false
+            // Enable code shrinking and resource shrinking
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    
+    // Split APKs by ABI for smaller individual downloads
+    splits {
+        abi {
+            isEnable = true
+            reset()
+            include("arm64-v8a", "armeabi-v7a")
+            isUniversalApk = true // Also generate universal APK
         }
     }
 }

android/app/proguard-rules.pro

@@ -0,0 +1,33 @@
+# Flutter specific rules
+-keep class io.flutter.app.** { *; }
+-keep class io.flutter.plugin.** { *; }
+-keep class io.flutter.util.** { *; }
+-keep class io.flutter.view.** { *; }
+-keep class io.flutter.** { *; }
+-keep class io.flutter.plugins.** { *; }
+
+# Go backend (gobackend.aar)
+-keep class gobackend.** { *; }
+-keep class go.** { *; }
+
+# FFmpeg Kit
+-keep class com.arthenica.ffmpegkit.** { *; }
+-keep class com.arthenica.smartexception.** { *; }
+
+# Keep native methods
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
+# Kotlin coroutines
+-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
+-keepnames class kotlinx.coroutines.CoroutineExceptionHandler {}
+-keepclassmembers class kotlinx.coroutines.** {
+    volatile <fields>;
+}
+
+# Prevent R8 from removing metadata
+-keepattributes *Annotation*
+-keepattributes SourceFile,LineNumberTable
+-keepattributes Signature
+-keepattributes Exceptions

lib/providers/download_queue_provider.dart

@@ -2,8 +2,8 @@ import 'dart:async';
 import 'dart:io';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:path_provider/path_provider.dart';
-import 'package:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
-import 'package:ffmpeg_kit_flutter_new/return_code.dart';
+import 'package:ffmpeg_kit_flutter_new_audio/ffmpeg_kit.dart';
+import 'package:ffmpeg_kit_flutter_new_audio/return_code.dart';
 import 'package:spotiflac_android/models/download_item.dart';
 import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/models/track.dart';

lib/services/ffmpeg_service.dart

@@ -1,6 +1,6 @@
 import 'dart:io';
-import 'package:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
-import 'package:ffmpeg_kit_flutter_new/return_code.dart';
+import 'package:ffmpeg_kit_flutter_new_audio/ffmpeg_kit.dart';
+import 'package:ffmpeg_kit_flutter_new_audio/return_code.dart';
 
 /// FFmpeg service for audio conversion and remuxing
 class FFmpegService {

pubspec.lock

@@ -313,14 +313,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
-  ffmpeg_kit_flutter_new:
+  ffmpeg_kit_flutter_new_audio:
     dependency: "direct main"
     description:
-      name: ffmpeg_kit_flutter_new
-      sha256: d127635f27e93a7f21f0a14ce0a1a148e80919c402dac4a2118d73bfb17ce841
+      name: ffmpeg_kit_flutter_new_audio
+      sha256: "0a698b46cd163c8e9917af75325c84d27871a2a8b2c37de3b40486cd0ab662ae"
       url: "https://pub.dev"
     source: hosted
-    version: "4.1.0"
+    version: "2.0.0"
   ffmpeg_kit_flutter_platform_interface:
     dependency: transitive
     description:

pubspec.yaml

@@ -48,8 +48,8 @@ dependencies:
   device_info_plus: ^12.3.0
   share_plus: ^10.1.4
   
-  # FFmpeg for audio conversion
-  ffmpeg_kit_flutter_new: ^4.1.0
+  # FFmpeg for audio conversion (audio-only version - much smaller)
+  ffmpeg_kit_flutter_new_audio: ^2.0.0
   open_filex: ^4.7.0
 
 dev_dependencies: