diff --git a/.changes/notification-cancel-all-android.md b/.changes/notification-cancel-all-android.md
new file mode 100644
index 0000000000..fee83deb1b
--- /dev/null
+++ b/.changes/notification-cancel-all-android.md
@@ -0,0 +1,6 @@
+---
+"notification": patch
+"notification-js": patch
+---
+
+Fix `cancel` command crashing on Android with `UninitializedPropertyAccessException` when invoked with no `notifications` argument — i.e. when the JS `cancelAll()` API or the Rust `NotificationExt::cancel_all()` SDK method is used. `CancelArgs.notifications` is now an optional list defaulting to `[]`; the handler routes an empty list to a new `TauriNotificationManager.cancelAll()` that enumerates saved notification IDs from storage and cancels each.
diff --git a/plugins/notification/android/src/main/java/NotificationPlugin.kt b/plugins/notification/android/src/main/java/NotificationPlugin.kt
index 3ead31527b..07c545d795 100644
--- a/plugins/notification/android/src/main/java/NotificationPlugin.kt
+++ b/plugins/notification/android/src/main/java/NotificationPlugin.kt
@@ -39,7 +39,7 @@ class BatchArgs {
 
 @InvokeArg
 class CancelArgs {
-  lateinit var notifications: List<Int>
+  var notifications: List<Int> = listOf()
 }
 
 @InvokeArg
@@ -152,7 +152,11 @@ class NotificationPlugin(private val activity: Activity): Plugin(activity) {
   @Command
   fun cancel(invoke: Invoke) {
     val args = invoke.parseArgs(CancelArgs::class.java)
-    manager.cancel(args.notifications)
+    if (args.notifications.isEmpty()) {
+      manager.cancelAll()
+    } else {
+      manager.cancel(args.notifications)
+    }
     invoke.resolve()
   }
 
diff --git a/plugins/notification/android/src/main/java/TauriNotificationManager.kt b/plugins/notification/android/src/main/java/TauriNotificationManager.kt
index a8912739bb..401c0d1db7 100644
--- a/plugins/notification/android/src/main/java/TauriNotificationManager.kt
+++ b/plugins/notification/android/src/main/java/TauriNotificationManager.kt
@@ -391,6 +391,10 @@ class TauriNotificationManager(
     }
   }
 
+  fun cancelAll() {
+    cancel(storage.getSavedNotificationIds().mapNotNull { it.toIntOrNull() })
+  }
+
   private fun cancelTimerForNotification(notificationId: Int) {
     val intent = Intent(context, TimedNotificationPublisher::class.java)
     var flags = 0