Check the devicedocumentation and look what this button is for
There is a orange button for Emergency and a button to talk .
it sends a key code and this message
====>interceptPorcessPTTkey
Calling a method in the system process without a qualified user: android.app.ContextImpl.sendBroadcast:966 android.content.ContextWrapper.sendBroadcast:437 com.meigsmart.meigkeyaccessibility.KeyAccessibilityService.onKeyEvent:49 android.accessibilityservice.AccessibilityService$2.onKeyEvent:1545 android.accessibilityservice.AccessibilityService$IAccessibilityServiceClientWrapper.executeMessage:1765
Is there a way to intercept this "====>keycode is 142,action=0"
What is displayed in the unfiltered log?