Mobile device battery management
In general, the subject matter described in this specification can be embodied in methods, systems, and program products. Data representing a plurality of power management profiles for a battery-operated wireless computing device are stored on the device. The power management profiles correspond to different power consumption levels. Each power management profile defines a feature for determining a geographic location of the device from among a plurality of features that are available for determining the geographic location of the device, and a frequency for employing the feature to determine the geographic location of the device. A first battery level of the device is determined. If the determined battery level is lower than a first predetermined amount, the device switches from a first power management profile having a first consumption level to a second power management profile having a second consumption level that is lower than the first consumption level.
1. A computer-implemented power management method, comprising:
receiving, at a server system providing a location-based service, information identifying a location of a particular remote computing device;
receiving, at the server system, information identifying a next time for an updated location of the particular remote computing device, wherein the information identifying the next time is received from the remote computing device together with the information identifying the location of the particular remote computing device; and
determining, by the server system, that a reported location of a user associated with the particular remote computing device is stale if an updated location is not received from the remote computing device before a predetermined time period that is relative to the identified next time for an update.
2. The method of claim 1 further comprising
adding information that indicates that a location of the user is unknown to transmissions made to acquaintances of the user as part of a friend finding application.
3. The method of claim 1 , further comprising, transmitting to another mobile device information that indicates that a reported location of the user is stale.
4. The method of claim 2 , further comprising presenting on a display device of the another mobile device an indication of a location of the user on a map and an interface element that indicates that the location of the user is stale.