35babb3126
Create unified alarm documentation system with strict role separation: - Doc A: Platform capability reference (canonical OS facts) - Doc B: Plugin behavior exploration (executable test harness) - Doc C: Plugin requirements (guarantees, JS/TS contract, traceability) Changes: - Add canonical rule to Doc A preventing platform fact duplication - Convert Doc B to pure executable test spec with scenario tables - Complete Doc C with guarantees matrix, JS/TS API contract, recovery contract, unsupported behaviors, and traceability matrix - Remove implementation details from unified directive - Add compliance milestone tracking and iOS parity gates - Add deprecation banners to legacy platform docs All documents now enforce strict role separation with cross-references to prevent duplication and ensure single source of truth.
469 lines
22 KiB
Markdown
469 lines
22 KiB
Markdown
# Platform Capability Reference: Android & iOS Alarm/Notification Behavior
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**Author**: Matthew Raymer
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**Date**: November 2025
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**Status**: Platform Reference - Stable
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**Version**: 1.1.0
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**Last Synced With Plugin Version**: v1.1.0
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## Purpose
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This document provides **pure OS-level facts** about alarm and notification capabilities on Android and iOS. It contains **no plugin-specific logic**—only platform mechanics that affect plugin design.
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**This is a reference document** to be consulted when designing plugin behavior, not an implementation guide.
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**⚠️ CANONICAL RULE**: No other document may contain OS-level behavior. All platform facts **MUST** reference this file. If platform behavior is described elsewhere, it **MUST** be moved here and replaced with a reference.
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**⚠️ DEPRECATED**: The following documents are superseded by this reference:
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- `platform-capability-reference.md` - Merged into this document
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- `android-alarm-persistence-directive.md` - Merged into this document
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**See**: [Unified Alarm Directive](./000-UNIFIED-ALARM-DIRECTIVE.md) for document structure.
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---
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## 1. Core Principles
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### Android
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Android does **not** guarantee persistence of alarms across process death, swipes, or reboot.
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It is the app's responsibility to **persist alarm definitions** and **re-schedule them** under allowed system conditions.
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### iOS
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iOS **does** persist scheduled local notifications across app termination and device reboot, but:
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* App code does **not** run when notifications fire (unless user interacts)
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* Background execution is severely limited
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* Apps must persist their own state if they need to track or recover missed notifications
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---
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## 2. Android Alarm Capability Matrix
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| Scenario | Will Alarm Fire? | OS Behavior | App Responsibility | Label |
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| --------------------------------------- | --------------------------------------- | -------------------------------------------------------------------- | ----------------------------------------------------- | ------------- |
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| **Swipe from Recents** | ✅ Yes | AlarmManager resurrects the app process | None (OS handles) | OS-guaranteed |
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| **App silently killed by OS** | ✅ Yes | AlarmManager still holds scheduled alarms | None (OS handles) | OS-guaranteed |
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| **Device Reboot** | ❌ No (auto) / ✅ Yes (if app reschedules) | All alarms wiped on reboot | Apps may reschedule from persistent storage on boot | Plugin-required |
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| **Doze Mode** | ⚠️ Only "exact" alarms | Inexact alarms deferred; exact alarms allowed | Apps must use `setExactAndAllowWhileIdle` | Plugin-required |
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| **Force Stop** | ❌ Never | Android blocks all callbacks + receivers until next user launch | Cannot bypass; apps may detect on app restart | Forbidden |
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| **User reopens app** | ✅ Apps may reschedule & recover | App process restarted | Apps may detect missed alarms and reschedule future ones | Plugin-required |
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| **PendingIntent from user interaction** | ✅ If triggered by user | User action unlocks the app | None (OS handles) | OS-guaranteed |
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### 2.1 Android Allowed Behaviors
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#### 2.1.1 Alarms survive UI kills (swipe from recents)
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**OS-guaranteed**: `AlarmManager.setExactAndAllowWhileIdle(...)` alarms **will fire** even after:
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* App is swiped away
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* App process is killed by the OS
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The OS recreates your app's process to deliver the `PendingIntent`.
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**Required API**: `setExactAndAllowWhileIdle()` or `setAlarmClock()`
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#### 2.1.2 Alarms can be preserved across device reboot
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**Plugin-required**: Android wipes all alarms on reboot, but **apps may recreate them**.
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**OS Behavior**: All alarms are cleared on device reboot. No alarms persist automatically.
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**App Capability**: Apps may recreate alarms after reboot by:
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1. Persisting alarm definitions in durable storage (Room DB, SharedPreferences, etc.)
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2. Registering a `BOOT_COMPLETED` / `LOCKED_BOOT_COMPLETED` broadcast receiver
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3. Rescheduling alarms from storage after boot completes
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**Required Permission**: `RECEIVE_BOOT_COMPLETED`
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**OS Condition**: User must have launched the app at least once before reboot for boot receiver to execute
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#### 2.1.3 Alarms can fire full-screen notifications and wake the device
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**OS-guaranteed**: **Required API**: `setFullScreenIntent(...)`, use an IMPORTANCE_HIGH channel with `CATEGORY_ALARM`
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This allows Clock-app–style alarms even when the app is not foregrounded.
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#### 2.1.4 Alarms can be restored after app restart
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**Plugin-required**: If the user re-opens the app (direct user action), apps may:
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* Access persistent storage (database, files, etc.)
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* Query alarm definitions
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* Reschedule alarms using AlarmManager
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* Reconstruct WorkManager/JobScheduler tasks that were cleared
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**OS Behavior**: When user opens app, app code can execute. AlarmManager and WorkManager APIs are available for rescheduling.
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**Note**: This is an app capability, not OS-guaranteed behavior. Apps must implement this logic.
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### 2.2 Android Forbidden Behaviors
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#### 2.2.1 You cannot survive "Force Stop"
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**Forbidden**: **Settings → Apps → YourApp → Force Stop** triggers:
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* Removal of all alarms
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* Removal of WorkManager tasks
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* Blocking of all broadcast receivers (including BOOT_COMPLETED)
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* Blocking of all JobScheduler jobs
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* Blocking of AlarmManager callbacks
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* Your app will NOT run until the user manually launches it again
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**Directive**: Accept that FORCE STOP is a hard kill. No scheduling, alarms, jobs, or receivers may execute afterward.
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#### 2.2.2 You cannot auto-resume after "Force Stop"
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**Forbidden**: You may only resume tasks when:
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* The user opens your app
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* The user taps a notification belonging to your app
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* The user interacts with a widget/deep link
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* Another app explicitly targets your component
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**OS Behavior**: Apps may only resume tasks when user opens app, taps notification, interacts with widget/deep link, or another app explicitly targets the component.
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#### 2.2.3 Alarms cannot be preserved solely in RAM
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**Forbidden**: Android can kill your app's RAM state at any time.
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**OS Behavior**: All alarm data must be persisted in durable storage. RAM-only storage is not reliable.
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#### 2.2.4 You cannot bypass Doze or battery optimization restrictions without permission
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**Conditional**: Doze may defer inexact alarms; exact alarms with `setExactAndAllowWhileIdle` are allowed.
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**Required Permission**: `SCHEDULE_EXACT_ALARM` on Android 12+ (API 31+)
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---
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## 3. iOS Notification Capability Matrix
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| Scenario | Will Notification Fire? | OS Behavior | App Responsibility | Label |
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| --------------------------------------- | ----------------------- | -------------------------------------------------------------------- | ----------------------------------------------------- | ------------- |
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| **Swipe from App Switcher** | ✅ Yes | UNUserNotificationCenter persists and fires notifications | None (OS handles) | OS-guaranteed |
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| **App Terminated by System** | ✅ Yes | UNUserNotificationCenter persists and fires notifications | None (OS handles) | OS-guaranteed |
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| **Device Reboot** | ✅ Yes (for calendar/time triggers) | iOS persists scheduled local notifications across reboot | None for notifications; must persist own state if needed | OS-guaranteed |
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| **App Force Quit (swipe away)** | ✅ Yes | UNUserNotificationCenter persists and fires notifications | None (OS handles) | OS-guaranteed |
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| **Background Execution** | ❌ No arbitrary code | Only BGTaskScheduler with strict limits | Cannot rely on background execution for recovery | Forbidden |
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| **Notification Fires** | ✅ Yes | Notification displayed; app code does NOT run unless user interacts | Must handle missed notifications on next app launch | OS-guaranteed |
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| **User Taps Notification** | ✅ Yes | App launched; code can run | Can detect and handle missed notifications | OS-guaranteed |
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### 3.1 iOS Allowed Behaviors
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#### 3.1.1 Notifications survive app termination
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**OS-guaranteed**: `UNUserNotificationCenter` scheduled notifications **will fire** even after:
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* App is swiped away from app switcher
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* App is terminated by system
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* Device reboots (for calendar/time-based triggers)
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**Required API**: `UNUserNotificationCenter.add()` with `UNCalendarNotificationTrigger` or `UNTimeIntervalNotificationTrigger`
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#### 3.1.2 Notifications persist across device reboot
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**OS-guaranteed**: iOS **automatically** persists scheduled local notifications across reboot.
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**No app code required** for basic notification persistence.
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**Limitation**: Only calendar and time-based triggers persist. Location-based triggers do not.
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#### 3.1.3 Background tasks for prefetching
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**Conditional**: **Required API**: `BGTaskScheduler` with `BGAppRefreshTaskRequest`
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**Limitations**:
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* Minimum interval between tasks (system-controlled, typically hours)
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* System decides when to execute (not guaranteed)
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* Cannot rely on background execution for alarm recovery
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* Must schedule next task immediately after current one completes
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### 3.2 iOS Forbidden Behaviors
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#### 3.2.1 App code does not run when notification fires
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**Forbidden**: When a scheduled notification fires:
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* Notification is displayed to user
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* **No app code executes** unless user taps the notification
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* Cannot run arbitrary code at notification time
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**Workaround**: Use notification actions or handle missed notifications on next app launch.
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#### 3.2.2 No repeating background execution
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**Forbidden**: iOS does not provide repeating background execution APIs except:
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* `BGTaskScheduler` (system-controlled, not guaranteed)
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* Background fetch (deprecated, unreliable)
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**OS Behavior**: Apps cannot rely on background execution to reconstruct alarms. Apps must persist state and recover on app launch.
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#### 3.2.3 No arbitrary code on notification trigger
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**Forbidden**: Unlike Android's `PendingIntent` which can execute code, iOS notifications only:
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* Display to user
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* Launch app if user taps
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* Execute notification action handlers (if configured)
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**OS Behavior**: All recovery logic must run on app launch, not at notification time.
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#### 3.2.4 Background execution limits
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**Forbidden**: **BGTaskScheduler Limitations**:
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* Minimum intervals between tasks (system-controlled)
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* System may defer or skip tasks
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* Tasks have time budgets (typically 30 seconds)
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* Cannot guarantee execution timing
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**Directive**: Use BGTaskScheduler for prefetching only, not for critical scheduling.
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---
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## 4. Cross-Platform Comparison
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| Feature | Android | iOS | Label |
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| -------------------------------- | --------------------------------------- | --------------------------------------------- | ------------- |
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| **Survives swipe/termination** | ✅ Yes (with exact alarms) | ✅ Yes (automatic) | OS-guaranteed |
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| **Survives reboot** | ❌ No (must reschedule) | ✅ Yes (automatic for calendar/time triggers) | Mixed |
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| **App code runs on trigger** | ✅ Yes (via PendingIntent) | ❌ No (only if user interacts) | Mixed |
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| **Background execution** | ✅ WorkManager, JobScheduler | ⚠️ Limited (BGTaskScheduler only) | Mixed |
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| **Force stop equivalent** | ✅ Force Stop (hard kill) | ❌ No user-facing equivalent | Android-only |
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| **Boot recovery required** | ✅ Yes (must implement) | ❌ No (OS handles) | Android-only |
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| **Missed alarm detection** | ✅ Must implement on app launch | ✅ Must implement on app launch | Plugin-required |
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| **Exact timing** | ✅ Yes (with permission) | ⚠️ ±180s tolerance | Mixed |
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| **Repeating notifications** | ✅ Must reschedule each occurrence | ✅ Can use `repeats: true` in trigger | Mixed |
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---
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## 5. Android API Level Matrix
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### 5.1 Alarm Scheduling APIs by API Level
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| API Level | Available APIs | Label | Notes |
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| --------- | -------------- | ----- | ----- |
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| **API 19-20** (KitKat) | `setExact()` | OS-Permitted | May be deferred in Doze |
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| **API 21-22** (Lollipop) | `setExact()`, `setAlarmClock()` | OS-Guaranteed | `setAlarmClock()` preferred |
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| **API 23+** (Marshmallow+) | `setExact()`, `setAlarmClock()`, `setExactAndAllowWhileIdle()` | OS-Guaranteed | `setExactAndAllowWhileIdle()` required for Doze |
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| **API 31+** (Android 12+) | All above + `SCHEDULE_EXACT_ALARM` permission required | Conditional | Permission must be granted by user |
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### 5.2 Android S+ Exact Alarm Permission Decision Tree
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**Android 12+ (API 31+) requires `SCHEDULE_EXACT_ALARM` permission**:
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```
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Is API level >= 31?
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├─ NO → No permission required
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└─ YES → Check permission status
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├─ Granted → Can schedule exact alarms
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├─ Not granted → Must request permission
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│ ├─ User grants → Can schedule exact alarms
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│ └─ User denies → Cannot schedule exact alarms (use inexact or show error)
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└─ Revoked → Cannot schedule exact alarms (user must re-enable in Settings)
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```
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**Label**: Conditional (requires user permission on Android 12+)
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### 5.3 Required Platform APIs
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**Alarm Scheduling**:
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* `AlarmManager.setExactAndAllowWhileIdle()` - Android 6.0+ (API 23+) - **OS-Guaranteed**
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* `AlarmManager.setAlarmClock()` - Android 5.0+ (API 21+) - **OS-Guaranteed**
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* `AlarmManager.setExact()` - Android 4.4+ (API 19+) - **OS-Permitted** (may be deferred in Doze)
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**Permissions**:
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* `RECEIVE_BOOT_COMPLETED` - Boot receiver - **OS-Permitted** (requires user to launch app once)
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* `SCHEDULE_EXACT_ALARM` - Android 12+ (API 31+) - **Conditional** (user must grant)
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**Background Work**:
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* `WorkManager` - Deferrable background work - **OS-Permitted** (timing not guaranteed)
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* `JobScheduler` - Alternative (API 21+) - **OS-Permitted** (timing not guaranteed)
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### 5.2 iOS
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**Notification Scheduling**:
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* `UNUserNotificationCenter.add()` - Schedule notifications
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* `UNCalendarNotificationTrigger` - Calendar-based triggers
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* `UNTimeIntervalNotificationTrigger` - Time interval triggers
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**Background Tasks**:
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* `BGTaskScheduler.submit()` - Schedule background tasks
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* `BGAppRefreshTaskRequest` - Background fetch requests
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**Permissions**:
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* Notification authorization (requested at runtime)
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---
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## 6. iOS Timing Tolerance Table
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### 6.1 Notification Timing Accuracy
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| Trigger Type | Timing Tolerance | Label | Notes |
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| ------------ | ---------------- | ----- | ----- |
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| **Calendar-based** (`UNCalendarNotificationTrigger`) | ±180 seconds | OS-Permitted | System may defer for battery optimization |
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| **Time interval** (`UNTimeIntervalNotificationTrigger`) | ±180 seconds | OS-Permitted | System may defer for battery optimization |
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| **Location-based** (`UNLocationNotificationTrigger`) | Not applicable | OS-Permitted | Does not persist across reboot |
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**Source**: [Apple Developer Documentation - UNNotificationTrigger](https://developer.apple.com/documentation/usernotifications/unnotificationtrigger)
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### 6.2 Background Task Timing
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| Task Type | Execution Window | Label | Notes |
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| --------- | ---------------- | ----- | ----- |
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| **BGAppRefreshTask** | System-controlled (hours between tasks) | OS-Permitted | Not guaranteed, system decides |
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| **BGProcessingTask** | System-controlled | OS-Permitted | Not guaranteed, system decides |
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**Source**: [Apple Developer Documentation - BGTaskScheduler](https://developer.apple.com/documentation/backgroundtasks/bgtaskscheduler)
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---
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## 7. Platform-Specific Constraints Summary
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### 6.1 Android Constraints
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1. **Reboot**: All alarms wiped; must reschedule from persistent storage
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2. **Force Stop**: Hard kill; cannot bypass until user opens app
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3. **Doze**: Inexact alarms deferred; must use exact alarms
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4. **Exact Alarm Permission**: Required on Android 12+ for precise timing
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5. **Boot Receiver**: Must be registered and handle `BOOT_COMPLETED`
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### 6.2 iOS Constraints
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1. **Background Execution**: Severely limited; cannot rely on it for recovery
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2. **Notification Firing**: App code does not run; only user interaction triggers app
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3. **Timing Tolerance**: ±180 seconds for calendar triggers
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4. **BGTaskScheduler**: System-controlled; not guaranteed execution
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5. **State Persistence**: Must persist own state if tracking missed notifications
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---
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## 8. Revision Sources
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### 8.1 AOSP Version
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**Android Open Source Project**: Based on AOSP 14 (Android 14) behavior
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**Last Validated**: November 2025
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**Source Files Referenced**:
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* `frameworks/base/core/java/android/app/AlarmManager.java`
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* `frameworks/base/core/java/android/app/PendingIntent.java`
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### 8.2 Official Documentation
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**Android**:
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* [AlarmManager - Android Developers](https://developer.android.com/reference/android/app/AlarmManager)
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* [Schedule exact alarms - Android Developers](https://developer.android.com/training/scheduling/alarms)
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**iOS**:
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* [UNUserNotificationCenter - Apple Developer](https://developer.apple.com/documentation/usernotifications/unusernotificationcenter)
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* [BGTaskScheduler - Apple Developer](https://developer.apple.com/documentation/backgroundtasks/bgtaskscheduler)
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### 8.3 Tested Device Set
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**Android Devices Tested**:
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* Pixel 7 (Android 14)
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* Samsung Galaxy S23 (Android 13)
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* OnePlus 11 (Android 13)
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**iOS Devices Tested**:
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* iPhone 15 (iOS 17)
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* iPhone 14 (iOS 16)
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**Note**: OEM-specific behavior variations documented in [§8 - OEM Variation Policy](#8-oem-variation-policy)
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### 8.4 Last Validated on Physical Devices
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**Last Validation Date**: November 2025
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**Validation Scenarios**:
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* Swipe from recents - ✅ Validated on all devices
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* Device reboot - ✅ Validated on all devices
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* Force stop (Android) - ✅ Validated on Android devices
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* Background execution (iOS) - ✅ Validated on iOS devices
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**Unvalidated Scenarios**:
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* OEM-specific variations (Xiaomi, Huawei) - ⚠️ Not yet tested
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---
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## 9. Label Definitions
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**Required Labels** (every platform behavior MUST be tagged):
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| Label | Definition | Usage |
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| ----- | ---------- | ----- |
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| **OS-Guaranteed** | The operating system provides this behavior automatically. No plugin code required. | Use when OS handles behavior without app intervention |
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| **OS-Permitted but not guaranteed** | The OS allows this behavior, but timing/execution is not guaranteed. Plugin may need fallbacks. | Use for background execution, system-controlled timing |
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| **Forbidden** | This behavior is not possible on this platform. Plugin must not attempt it. | Use for hard OS limitations (e.g., Force Stop bypass) |
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| **Undefined / OEM-variant** | Behavior varies by device manufacturer or OS version. Not universal. | Use when behavior differs across OEMs or OS versions |
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**Legacy Labels** (maintained for backward compatibility):
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- **Plugin-required**: The plugin must implement this behavior. The OS does not provide it automatically.
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- **Conditional**: This behavior is possible but requires specific conditions (permissions, APIs, etc.).
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---
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## 10. OEM Variation Policy
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**Android is not monolithic** — behavior may vary by OEM (Samsung, Xiaomi, Huawei, etc.).
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**Policy**:
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* **Do not document** until reproduced in testing
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* **Mark as "Observed-variant (not universal)"** if behavior differs from AOSP
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* **Test on multiple devices** before claiming universal behavior
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* **Document OEM-specific workarounds** in Doc C (Requirements), not Doc A (Platform Facts)
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**Example**:
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* ❌ **Wrong**: "All Android devices wipe alarms on reboot"
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* ✅ **Correct**: "AOSP Android wipes alarms on reboot. Observed on: Samsung, Pixel, OnePlus. Not tested on: Xiaomi, Huawei."
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---
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## 11. Citation Rule
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**Platform facts must come from authoritative sources**:
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**Allowed Sources**:
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1. **AOSP source code** - Direct inspection of Android Open Source Project
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2. **Official Android/iOS documentation** - developer.android.com, developer.apple.com
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3. **Reproducible test results** (Doc B) - Empirical evidence from testing
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**Prohibited Sources**:
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* Stack Overflow answers (unless verified)
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* Blog posts (unless citing official docs)
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* Assumptions or "common knowledge"
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* Unverified OEM-specific claims
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**Citation Format**:
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* For AOSP: `[AOSP: AlarmManager.java:123]`
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* For official docs: `[Android Docs: AlarmManager]`
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* For test results: `[Doc B: Test 4 - Device Reboot]`
|
||
|
||
**If source is unclear**: Mark as "Unverified" or "Needs citation" until verified.
|
||
|
||
---
|
||
|
||
## Related Documentation
|
||
|
||
- [Unified Alarm Directive](./000-UNIFIED-ALARM-DIRECTIVE.md) - Master coordination document
|
||
- [Plugin Behavior Exploration](./02-plugin-behavior-exploration.md) - Uses this reference
|
||
- [Plugin Requirements](./03-plugin-requirements.md) - Implementation based on this reference
|
||
|
||
---
|
||
|
||
## Version History
|
||
|
||
- **v1.1.0** (November 2025): Enhanced with API levels, timing tables, revision sources
|
||
- Added Android API level matrix
|
||
- Added Android S+ exact alarm permission decision tree
|
||
- Added iOS timing tolerance table
|
||
- Added revision sources section
|
||
- Added tested device set
|
||
- Enhanced labeling consistency
|
||
|
||
- **v1.0.0** (November 2025): Initial platform capability reference
|
||
- Merged from `platform-capability-reference.md` and `android-alarm-persistence-directive.md`
|
||
- Android alarm matrix with labels
|
||
- iOS notification matrix with labels
|
||
- Cross-platform comparison
|
||
- Label definitions
|
||
|