# Sunmi T3 POS Secondary Touch Input Leak Issue and Solution Search Technical solution proposals for touch input leakage in POS devices. - **Source:** [Developing Android Apps](https://brifing.si/source/aa76b6c1-28c1-49f8-967e-b6a0eeadfa86) - **Published:** 2026-07-21 - **Topic:** [Software & Engineering](https://brifing.si/c/engineering) - **Original article:** - **On Brifing:** https://brifing.si/s/81d0274d-b218-4127-bbe6-ee2f7c90c654 ## Root of the Problem On Sunmi T3 POS devices, touch inputs from the secondary display leak to the main screen, causing unintended interactions in the cashier app. This occurs when customer touches on the ad display affect the cashier interface. ## Existing Solution Attempts Standard Android solutions like FLAG_NOT_TOUCHABLE and FLAG_NOT_FOCUSABLE have been tried but failed. This hardware-level issue at Sunmi's layer bypasses software-level prevention methods. ## Sunmi T3 Limitations The device's settings menu is extremely limited and offers no options for touch input management. Additionally, incomplete and Chinese-heavy documentation creates extra challenges for developers. ## Technical Details The problem stems from the kernel-level input driver processing touch events directly at system level. This renders standard Android window management methods ineffective. ## Potential Solution Paths Alternative methods like Sunmi DS_SDK specific calls or AccessibilityService usage are being investigated. A system-level solution without root access is needed. ## Industry Importance As multi-screen usage in POS systems becomes more common, such hardware-software integration issues become critical. Reliable solutions need to be developed for the retail sector. ## Sources covering this story - https://www.reddit.com/r/androiddev/comments/1v22kya/advice_needed_secondary_touch_input_leaking_to/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._