Flutter releasebuild bundle is too big

Question

I have recently switched from Android native Java platform to Flutter. From tutorials and online information I understand that dubug app size could be large but not the release one.

Flutter releasebuild bundle is 123.7 MBs. And when installed, app size increase to about 300 to 350 MBs.

I have no media in assets. All mipmap and drawables are minified to total of less then 100 kbs.

I have this app where I am using following plugins:

  cupertino_icons: ^1.0.2
  flutter_native_splash: ^1.2.3
  firebase_core:
  firebase_auth: ^3.1.3
  cloud_firestore: ^2.5.3
  firebase_messaging: ^10.0.8
  firebase_storage: ^10.0.5
  sqflite: ^2.0.0+4
  path_provider: ^2.0.5
  permission_handler: ^8.1.6
  pinput: ^1.2.0
  flutter_launcher_icons: ^0.9.2
  http: ^0.13.3
  flutter_local_notifications: ^8.2.0
  contacts_service: ^0.6.3
  intl: ^0.17.0
  file_picker: ^4.1.4
  cached_network_image: ^3.1.0
  provider: ^6.0.1
  awesome_notifications: any
  flutter_sound: ^8.4.1+1
  stream_transform: ^2.0.0
  jitsi_meet: ^4.0.0
  dio: ^4.0.1
  google_fonts: ^2.1.0
  share_plus: ^3.0.4
  fluttertoast: ^8.0.8
  connectivity_plus: ^2.0.2
  shared_preferences: ^2.0.8
  random_string: ^2.3.1

I am using Proguard in gradle:

buildTypes {
    release {
        signingConfig signingConfigs.release
        minifyEnabled true
        shrinkResources true
        useProguard true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

And proguard-rule file:

## Flutter wrapper
 -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.** { *; }
 -keep class com.google.firebase.** { *; }
 -dontwarn io.flutter.embedding.**
 -ignorewarnings

Also I have tried to clean and run build query like below, but no difference:

flutter clean && flutter build appbundle

Any suggestion and help would be appreciated.

UPDATE:

As suggested by שו אוהב אותך, problem seems to be with flutter_sound plugin. I switched from flutter_sound to flutter_sound_lite and tried to rebuild. Now I get error.

Attribute receiver#androidx.media.session.MediaButtonReceiver@exported value=(false) from [:awesome_notifications] AndroidManifest.xml:59:13-37 is also present at [com.github.canardoux:flutter_sound_core:8.4.2] AndroidManifest.xml:18:13-36 value=(true). Suggestion: add 'tools:replace="android:exported"' to element at AndroidManifest.xml:57:9-63:20 to override.

Manifest:

<activity> // Main Activity
    <intent-filter>
        <action android:name="FLUTTER_NOTIFICATION_CLICK" />
        <category android:name="android.intent.category.DEFAULT"/>
    </intent-filter>
</activity>

Any suggestion? Thanks.

Solution

As suggested by שו אוהב אותך, problem seems to be with flutter_sound plugin. I switched from flutter_sound to flutter_sound_lite but problem remained.

So finally I ended up developing my own plugin for Flutter. Currently it's working for android only but will be brought available for IOS soon.

Now my appbundle size has reduced to 47.6 MBs from 123.6 MBs.

Plugin link is given below if anyone has the same issue:

Flutter Sound System - Plugin Link

Comments

[ישו אוהב אותך]

You don't need to -keep the flutter library. Try to commenting all the above -keep line in your proguard. Usually, google firebase already included its own proguard-rule in its library.

[ישו אוהב אותך]

And, try to check this issue for using flutter_sound: github.com/Canardoux/flutter_sound/issues/291

[Dev Chauhan]

Thanks for your suggestion. Yes that seems to be the problem then. I switched from flutter_sound to flutter_sound_lite and tried to rebuild. Now I get error Attribute receiver#androidx.media.session.MediaButtonReceiver@exported value=(false) from [:awesome_notifications] AndroidManifest.xml:59:13-37 is also present at [com.github.canardoux:flutter_sound_core:8.4.2] AndroidManifest.xml:18:13-36 value=(true). Suggestion: add 'tools:replace="android:exported"' to <receiver> element at AndroidManifest.xml:57:9-63:20 to override.. Manifest updated in question. Any suggestion?

[ישו אוהב אותך]

Probably related to your problem: github.com/Canardoux/flutter_sound/issues/789

[Dev Chauhan]

Thanks again. So you mean my second problem has been fixed in latest flutter_sound plugin but not the original one?