Missing classes detected while running R8 in android release mode

[GabrielCoffee9]

Is this a how to question?
No

Is this a native Spotify SDK issue?
No

Have you searched for existing issues?
Yes

Are you using a Free or Premium Spotify account?
Premium

Are you aware of the limitations of Free Spotify accounts?
Yes

Expected behavior
Flutter Build successful

Describe the bug
"On console -> ERROR: Missing classes detected while running R8."

Steps to Reproduce
Steps to reproduce the behavior:

1. Create a new Flutter application with Android platform
2. Add Spotify_sdk package -> flutter pub add spotify_sdk
3. Run auto setup for android -> dart run spotify_sdk:android_setup
4. Run -> flutter build apk
5. See the error

Screenshots

Spotify_sdk Flutter package version 3.0.2

Flutter version 3.24.3

spotify_sdk:
    dependency: "direct main"
    description:
      name: spotify_sdk
      sha256: "4c7a3b79f0370e7ae8ac07cad5e630d0bb3ad118f4c16219ec37f6988a65465e"
      url: "https://pub.dev"
    source: hosted
    version: "3.0.2"

Target Platform, Version & Device

• OS & Version: Tested Android 14 and 15
• Device: Tested in Android Emulator Medium Phone API 34 and 35

Development OS

• Windows

Tried to build the release apk in my personal project and get this error, I created a new flutter android project and followed the steps above, getting the same error. This Error doesn't occurs in debug mode.

[SaNu-hIT]

Got a fix .
Hope it will help.

Step 1: Locate the proguard-rules.pro File

Check if a file named proguard-rules.pro exists. If it doesn't, create a new file named proguard-rules.pro in this directory.

Step 2: Add the Required ProGuard Rules

-dontwarn com.fasterxml.jackson.databind.deser.std.StdDeserializer
-dontwarn com.fasterxml.jackson.databind.ser.std.StdSerializer
-dontwarn com.spotify.base.annotations.NotNull

Step 3: Clean and Rebuild the Project

[GabrielCoffee9]

Got a fix . Hope it will help.

Step 1: Locate the proguard-rules.pro File

Check if a file named proguard-rules.pro exists. If it doesn't, create a new file named proguard-rules.pro in this directory.

Step 2: Add the Required ProGuard Rules

-dontwarn com.fasterxml.jackson.databind.deser.std.StdDeserializer -dontwarn com.fasterxml.jackson.databind.ser.std.StdSerializer -dontwarn com.spotify.base.annotations.NotNull

Step 3: Clean and Rebuild the Project

Yes, this works to build the project, but I think this is just an action to "remove warning", does not solve the real problem that could cause unexpected errors and bugs.

[SaNu-hIT]

Testing it form my side , integration seems solid in release mode also. So far no errors or bugs .

[GabrielCoffee9]

I found a bug that only happens in release mode too (on Android), where the Connection Status does not work correctly due to probably a parsing problem, could it be related to these missing classes?

I say this because there are missing classes which have a role of serializing json like com.fasterxml.jackson.databind.deser.std.StdDeserializer and com.fasterxml.jackson.databind.ser.std.StdSerializer

In the function ConnectionStatus _$ConnectionStatusFromJson(Map<String, dynamic> json) in the file:

"C:\Users{USERNAME}\AppData\Local\Pub\Cache\hosted\pub.dev\spotify_sdk-3.0.2\lib\models\connection_status.g.dart"

The parameter json is filled with keys:'a', 'b', 'c' and 'd' when in release mode, instead of 'connected', 'message', 'errorCode' and 'errorDetails'. The values are ok but the json keys are wrong.

I had to make changes to an automatically generated function so that the returned json was read correctly.
@brim-borium I don't know if this bug is directly related to this problem, should I open another issue?

[brim-borium]

@GabrielCoffee9 thank you for reporting this, yes please open a separate issue