Android Power Management
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2022-05-01
20:41:42
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Android Power Management
Overview
The above picture shows the overall architecture design of Android power
management module. Android implements a very simple power management
mechanism. Currently it only supports set screen on/o, screen backlight on/o,
keyboard backlight on/o, button backlight on/o and adjust screen brightness. It
does not support Sleep or Standby mode to fully use CPU’s capability.
The power management module has three channels to receive input: RPC call, Batter
state change event and Power Setting change event. It communicated with other
modules through either broadcasting intent or directly API call. The module
also provide reboot and shutdown service. When battery is lower than thredshold, it
will automatically shutdown the device.
The module will automatically set screen dim and o according to whether any user
activity happens or not. The full state machine is shown as follows:
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