| 摘要 |
Methods and systems are described for selectively invoking a positioning system for a mobile device. In some implementations, first and second signals are received from first and second non-position-based sensors, respectively, each representative of a context of the mobile device. A processor determines whether the mobile device is in motion based on at least one of the first and second signals; and in response to determining that the mobile device is in motion, a positioning system is invoked to receive a position measurement of the mobile device. The processor determines whether a user of the mobile device is likely in control of a vehicle; and in response to determining that the user is likely in control of a vehicle, the operation of the mobile device is restricted.
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