The area of the screen being pressed.
This value is scaled to a range between 0 and 1. It can be used to determine fat touch events. This value is only set on Android and is a device specific approximation within the range of detectable values. So, for example, the value of 0.1 could mean a touch with the tip of the finger, 0.2 a touch with full finger, and 0.3 the full palm.
Because this value uses device-specific range and is uncalibrated, it is of limited use and is primarily retained in order to be able to reconstruct original pointer events for AndroidView.
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