GravitySensor: GravitySensor() constructor

Options are as follows:

frequency

The desired number of times per second a sample should be taken, meaning the number of times per second that the reading event will be called. A whole number or decimal may be used, the latter for frequencies less than a second. The actual reading frequency depends on device hardware and consequently may be less than requested. The default frequency is the one defined by the underlying platform.

referenceFrame

The local coordinate system representing the reference frame. It can be either 'device' or 'screen'. The default is 'device'.

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