PendingIntent: Targeting S+ (version 31 and above) requires FLAG_IMMUTABLE or FLAG_MUTABLE

[sanderschnydrig]

I'm using Angular 12 with Capacitor and this Plugin, set the compileSdkVersion and targetSdkVersion to 31 in variables.gradle (I prefer not to put them to 31 as this can cause a lot of issues down the line). When I start the app on Android I get this error:

 Caused by: java.lang.IllegalArgumentException: ch.pomona.newsapp: 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 com.gokadzev.capacitormusiccontrols.MusicControlsNotification.createBuilder(MusicControlsNotification.java:209)
        at com.gokadzev.capacitormusiccontrols.MusicControlsNotification.updateNotification(MusicControlsNotification.java:81)
        at com.gokadzev.capacitormusiccontrols.CapacitorMusicControls.updateMetadata(CapacitorMusicControls.java:224)
        at com.gokadzev.capacitormusiccontrols.CapacitorMusicControls.create(CapacitorMusicControls.java:42)
            ... 9 more

I solved it by reverting back to API level 30 instead of 31 and forcing the androidx.appcompat dependency to version 1.2.0 (instead of 1.4.2 that will be picked otherwise):

in your app/build.gradle:

dependencies {
    implementation("androidx.appcompat:appcompat:$androidxAppCompatVersion") {
        force = true
    }
}

[FloryanFilip]

I tried that but I'm getting

        resultPendingIntent = PendingIntent.getActivity(context, 0, resultIntent, PendingIntent.FLAG_MUTABLE);
                                                                                                   ^
  symbol:   variable FLAG_MUTABLE
  location: class PendingIntent

build error during gradle build process

[sanderschnydrig]

@FloryanFilip make sure you explicitly set the version ($androidxAppCompatVersion in my case) to 1.2.0, other than that I have no idea how to solve it in your case.

dependencies {
    implementation("androidx.appcompat:appcompat:1.2.0") {
        force = true
    }
}

[gokadzev]

@sanderschnydrig @FloryanFilip if problem will be still active after updating latest version tell me and i will change appcompat version in code.