IssueTracker

Devices/Android versions reproduced on:
S Pen Available Samsung Device.
U OS.

There is a function that selects Text by pressing the button of Samsung's S pen.
If you press the button of S pen and drag to select the text of ViewPager, scroll occurs and normal text selection is not possible.

This problem occurs only in U OS.
Before U OS, when pressing Samsung's S pen button, Samsung's custom events such as SEM_ACTION_PEN_DOWN were delivered.
So Viewpager.onInterceptTouchEvent dragging logic didn't work.

But new cts test is added in U OS. So Samsung changed custom events such as SEM_ACTION_PEN_DOWN to Android events such as ACTION_DOWN.
(https://cs.android.com/android/platform/superproject/main/+/main:cts/tests/input/src/android/input/cts/StylusButtonInputEventTest.kt)
So Viewpager.onInterceptTouchEvent dragging logic is occurring.

When pressing button in S pen, MotionEvent is as follows:
MotIonEvent event.getToolType(0) == MotionEvent.TOOL_TYPE_STYLUS
MotIonEvent event.getButtonState() == MotionEvent.BUTTON_STYLUS_PRIMARY

Please check whether it is possible to check ToolType and ButtonState when determining dragging in onInterceptTouchEvent.