| 摘要 |
A portable electronic device comprising a housing, and a first user interface, a second user interface and one or more sensors supported by the housing, and a method thereof. The first user interface has an active state, and the second user interface has an inactive state while the first user interface is in the active state. The sensor or sensors detect an environmental condition. The second user interface changes from the inactive state to the active state and the first user interface changes from the active state to the inactive state in response to one or more sensors detecting the environmental condition. For another embodiment, the device may detect an energy level of a power source of the portable electronic device. The second user interface of the portable electronic device is then activated and the first user interface of the portable electronic device is deactivated in response to detecting the energy level of the power source.
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