Code to cause a preventive crash if using Adaptive Icons with Android Oreo, in order to avoid a crash loop

crash_preventing_crash_android_oreo.kt

private fun hasDefaultFCMIconInMetadata(context: Context): Boolean {
    try {
        val appInfo = context.packageManager.getApplicationInfo(
                context.packageName, PackageManager.GET_META_DATA)
        if (appInfo.metaData != null) {

            return appInfo.metaData.getInt(META_DATA_FIREBASE_NOTIFICATION_IMAGE, -1) != -1
        }
    } catch (_: PackageManager.NameNotFoundException) {
    }
    return false
}

private fun targetIsBelowOreo(context: Context): Boolean =
         context.packageManager.getApplicationInfo(context.packageName, 0).targetSdkVersion < Build.VERSION_CODES.O

private fun canCreateIconDrawable(context: Context): Boolean {
     try {
         val possibleBitmap = AdaptiveIconDrawable.createFromStream(
                 context.resources.openRawResource(context.applicationInfo.icon),
                 "applicationInfo.icon")

        if (possibleBitmap != null) {
             return true
         }
     } catch (_: Exception) {
     }
     return false
 }

fun validateApplicationIcon(context: Context) {
  if (targetIsBelowOreo(context)) {
    return
  }
  if (canCreateIconDrawable(context)) {
    return
  }
  if (hasDefaultFCMIconInMetadata(context)) {
    return
  }
  throw IllegalStateException(
      "You are targetting Android Oreo and using adaptive icons without having a fallback drawable set for FCM notifications. \n" +
              "This can cause a irreversible crash on devices using Oreo. \n " +
              "To learn more about this issue check: https://issuetracker.google.com/issues/68716460"
  )    
}