🐛 [firebase_messaging] Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE

[SAGARSURI]

Bug report

Describe the bug
When I upgrade targetSdkVersion and compileSdkVersion to 31 I get the following error:

java.lang.IllegalArgumentException: [redacted_applicaton_id]: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
    Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
        at android.app.PendingIntent.checkFlags(PendingIntent.java:375)
        at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:645)
        at android.app.PendingIntent.getBroadcast(PendingIntent.java:632)
        at androidx.work.impl.utils.ForceStopRunnable.getPendingIntent(ForceStopRunnable.java:273)
        at androidx.work.impl.utils.ForceStopRunnable.isForceStopped(ForceStopRunnable.java:151)
        at androidx.work.impl.utils.ForceStopRunnable.forceStopRunnable(ForceStopRunnable.java:171)
        at androidx.work.impl.utils.ForceStopRunnable.run(ForceStopRunnable.java:102)
        at androidx.work.impl.utils.SerialExecutor$Task.run(SerialExecutor.java:91)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:920)

Steps to reproduce

upgrade targetSdkVersion and compileSdkVersion to 31 in build.gradle

Expected behavior

The application should not crash.

---

Additional context

Add any other context about the problem here.

---

Flutter doctor

Run flutter doctor and paste the output below:

Click To Expand

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.5.3, on Mac OS X 10.15.7 19H1419 darwin-x64,
    locale en-IN)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for
      more details.
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 2020.3)
[✓] IntelliJ IDEA Community Edition (version 2021.2.2)
[✓] VS Code (version 1.60.2)
[✓] Connected device (3 available)

[ItzNotABug]

When targeting Android S+, some internal androidx libraries still use an older version of WorkManager which do not use FLAG_IMMUTABLE or FLAG_MUTABLE flag.

As a workaround,
simply add the latest version of the WorkManager dependency in your app's build.gradle & sync the project.

def work_version = "2.7.0"

// (Java only)
implementation "androidx.work:work-runtime:$work_version"

// Kotlin + coroutines
implementation "androidx.work:work-runtime-ktx:$work_version"

[russellwheatley]

Thanks for the workaround, @ItzNotABug. This isn't something actionable for Flutterfire.