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April 15th, 2026: The Surgical Swipe-Up

After the success of our Samsung-optimized recent-apps purge, today we focused on making that same “Fail-Closed” security work on non-Samsung devices like Lenovo, Motorola, and Pixel.

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Precision Coordinate Gestures

Different devices have different ways of handling the recent apps tray. Some use a “Close All” button, while others require a “flick” or “swipe-up” gesture. Today, I implemented a surgical swipe-up fallback in the Kotlin BlockerAccessibilityService. Using DisplayMetrics for precision coordinate calculation, I built the executeSwipeUpGesture helper. This allows the enforcer to programmatically “flick” restricted apps out of the recent tray if the button-based purge fails. I had to authorize native gestures in blocker_config.xml to make this possible, but the result is a much more universal anti-tamper engine.

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High-Resolution Diagnostics

Debugging gestures is notoriously difficult. I added high-resolution diagnostic logs—[GESTURE_DEBUG] and [RECENTS_PURGE]—that allow for real-time enforcement auditing via adb logcat. Now, I can see exactly where the enforcer is “clicking” or “swiping” and verify its effectiveness across different device architectures.

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Performance & Safety

The gesture-based purge is now integrated as Check #1 in our security audit sequence. This ensures that even if a user tries to hide a restricted settings app in the background, it is physically neutralized before the hardware screen lock is applied. I also fixed a scope-related compilation error in the candidates fuzzy scan logic, making the whole enforcement pulse much more stable. Day 15 has successfully extended our high-security “Vault” to a much wider range of Android devices.

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Technical Summary

  • Native Security: Implemented executeSwipeUpGesture for universal recent-apps purges.
  • Coordinates: Used DisplayMetrics to ensure precision across different screen resolutions.
  • Audit: Refactored dismissTopRecentApp to trigger gesture-based flicking if the Samsung-path fails.
  • Diagnostics: Integrated [GESTURE_DEBUG] and [RECENTS_PURGE] logs for real-time enforcement auditing.