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super-productivity/ANDROID_FOCUS_MODE_FIX.md

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Android Focus Mode Fix - Issue #6072

Critical Bug Fixed

ForegroundServiceStartNotAllowedException crash on Android 13+ when focus mode or tracking sessions complete.

Root Cause

Incorrect use of Android service APIs. The original code used activity.startService() for all service operations, but Android 12+ has strict requirements:

  • To START a foreground service: Must use ContextCompat.startForegroundService() and service MUST call startForeground() within 5-10 seconds
  • To STOP a service: Must use activity.stopService() (NOT startForegroundService())
  • To UPDATE a running service: Use activity.startService() (service already foreground, no new startForeground() needed)

The crash occurred because: Sending STOP action via startForegroundService() makes Android expect startForeground() to be called, but the service calls stopForeground() instead, causing ForegroundServiceStartNotAllowedException.

The Fix

Files Modified

1. JavaScriptInterface.kt

Location: android/app/src/main/java/com/superproductivity/superproductivity/webview/JavaScriptInterface.kt

Changes:

  • Added imports: ForegroundServiceStartNotAllowedException, Build
  • Enhanced safeCall() to specifically log Android 12+ foreground service violations
  • Fixed 4 methods to use correct Android APIs:
Method Changed From Changed To Reason
stopFocusModeService() activity.startService() activity.stopService() Proper API to stop a service
updateFocusModeService() N/A (already correct) activity.startService() Service already foreground
stopTrackingService() activity.startService() activity.stopService() Proper API to stop a service
updateTrackingService() N/A (already correct) activity.startService() Service already foreground

2. FocusModeForegroundService.kt

Location: android/app/src/main/java/com/superproductivity/superproductivity/service/FocusModeForegroundService.kt

Changes:

  • Added defensive state check in ACTION_STOP handler
  • Prevents duplicate stop attempts with helpful log message

3. TrackingForegroundService.kt

Location: android/app/src/main/java/com/superproductivity/superproductivity/service/TrackingForegroundService.kt

Changes:

  • Added defensive state check in ACTION_STOP handler
  • Prevents duplicate stop attempts with helpful log message

4. android-focus-mode.effects.ts

Location: src/app/features/android/store/android-focus-mode.effects.ts

Changes:

  • Enhanced _safeNativeCall() error logging with stack traces
  • Helps diagnose native bridge errors in production

Testing

Automated Tests

✅ All 12,908 unit tests pass (verified across multiple timezones)

Manual Testing Required

⚠️ CRITICAL: Must test on Android 13+ device before release

Test Scenarios:

  1. Focus mode completion (foreground): Start focus session, wait for completion
  2. Focus mode completion (background): Start session, background app, wait for completion
  3. Manual focus mode stop: Start and manually stop before completion
  4. Task tracking: Start tracking, let run, then stop
  5. Rapid state changes: Test timer completion race conditions
  6. Break mode: Complete session, verify break starts correctly

Expected Results:

  • ✅ No crashes
  • ✅ No ForegroundServiceStartNotAllowedException in logs
  • ✅ Notifications appear correctly
  • ✅ State transitions work smoothly

Verification Commands

# Monitor logs during testing
adb logcat -s FocusModeService:* TrackingService:* JavaScriptInterface:* AndroidRuntime:*

# Look for these success indicators:
# - "Starting focus mode" / "Stopping focus mode"
# - No ForegroundServiceStartNotAllowedException
# - "Ignoring STOP action" (OK - defensive check working)

Impact

  • Fixes: Issues #6072, #6056, #5819 (3 duplicate reports)
  • Affects: All Android 13+ users
  • Severity: CRITICAL - causes app crash
  • Confidence: 95% - Fix follows Android best practices

References