Forcing app updates on Android using Google's in-app update library https://blog.jakelee.co.uk/implementing-google-in-app-updates-for-android/

build.gradle.kts

dependencies {
    implementation(libs.android.playAppUpdate)
    implementation(libs.android.playAppUpdateKtx)
}

ForceUpdateHandler.kt

// Adapted from https://developer.android.com/guide/playcore/in-app-updates/kotlin-java
class ForceUpdateHandler @Inject constructor(
    private val abTestManager: ABTestManager // Optional
) {
    fun forceUpdateIfNeeded(activity: ComponentActivity) {
      
        // Optional, an optimisation / safety check
        val minimumAllowedVersion = abTestManager.remoteConfigLong(FirebaseRemoteConfigKeys.minimum_version)
        if (BuildConfig.VERSION_CODE >= minimumAllowedVersion) {
            return
        }

        // Must be declared before activity is resumed: https://stackoverflow.com/a/67582633/608312
        val activityResult = activity.registerForActivityResult(ActivityResultContracts.StartIntentSenderForResult()) { result ->
            handleUpdateResult(result) {
                activity.finish()
            }
        }
        val appUpdateManager = AppUpdateManagerFactory.create(activity)
        val appUpdateInfoTask = appUpdateManager.appUpdateInfo

        appUpdateInfoTask.addOnSuccessListener { updateInfo ->
            if (updateInfo.isUpdateInProgress() || updateInfo.isForceUpdateRequired()) {
                startForceUpdateFlow(updateInfo, activityResult, appUpdateManager)
            }
        }
    }

    private fun AppUpdateInfo.isUpdateInProgress() =
        updateAvailability() == DEVELOPER_TRIGGERED_UPDATE_IN_PROGRESS

    private fun AppUpdateInfo.isForceUpdateRequired() =
        updateAvailability() == UPDATE_AVAILABLE && isUpdateTypeAllowed(IMMEDIATE)

    private fun startForceUpdateFlow(
        appUpdateInfo: AppUpdateInfo,
        activityResultLauncher: ActivityResultLauncher<IntentSenderRequest>,
        appUpdateManager: AppUpdateManager
    ) {
        appUpdateManager.startUpdateFlowForResult(
            appUpdateInfo,
            activityResultLauncher,
            AppUpdateOptions.newBuilder(IMMEDIATE).build()
        )
    }

    private fun handleUpdateResult(result: ActivityResult, onUpdateDialogClose: () -> Unit) {
        when (result.resultCode) {
            Activity.RESULT_OK -> Timber.i("User has started mandatory update")
            Activity.RESULT_CANCELED -> onUpdateDialogClose.invoke()
            RESULT_IN_APP_UPDATE_FAILED -> Timber.i("Mandatory update failed")
            else -> Timber.i("Error whilst updating (${result.resultCode}): ${result.data?.data}")
        }
    }
}

libs.versions.toml

[versions]
android-playAppUpdate = '2.1.0'

[libraries]
android-playAppUpdate = { module = "com.google.android.play:app-update", version.ref = "android-playAppUpdate" }
android-playAppUpdateKtx = { module = "com.google.android.play:app-update-ktx", version.ref = "android-playAppUpdate" }

TriggeringActivity.kt

updateHandler.forceUpdateIfNeeded(this)