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DirectStylus pen and eraser events are reported through standard Android 4.X
MotionEvent APIs. You do not need any special SDKs or APIs to access the additional functionality offered by DirectStylus.
NVIDIA has extended the Android framework to set the
TOOL_TYPE_STYLUS bit in the return value of
MotionEvent.getToolType() when the pen tip is detected, and
TOOL_TYPE_ERASER is set in the return value when the eraser tip is detected.
MotionEvent.getSource() has been modified to set the
SOURCE_STYLUS bit when the app is on the DirectStylus White List and the
SOURCE_TOUCHSCREEN bit is also set. Only the
SOURCE_TOUCHSCREEN bit is set if the app is not on the White List, to maintain compatibility with existing applications.
MotionEvent.getPressure() will return a relative value representing the tip contact area on the touch screen. Properly retrieving and handling this value will allow applications to display variable width lines on the screen, which correspond naturally to the stylus tip contact area.
Stylus Pen Stylus Eraser
Relative tip width measurement N/A
NVIDIA® GameWorks™ Documentation Rev. 1.0.200608 ©2014-2020. NVIDIA Corporation. All Rights Reserved.