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Battery use information is derived from battery use statistics and power profile values.
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Battery use statistics
The framework automatically determines battery use statistics by tracking how long devicecomponents spend in different states. As components (Wi-Fi chipset, cellular radio, Bluetooth, GPS,display, CPU) change states (OFF/ON, idle/full power, low/high brightness, etc.), the controllingservice reports to the framework BatteryStats service. BatteryStats collects information over timeand stores it for use across reboots. The service doesn’t track battery current draw directly,but instead collects timing information that can be used to approximate batteryconsumption by different components.
The framework gathers statistics using the following methods:
- Push. Services aware of component changes push state changes to theBatteryStats service.
- Pull. For components such as the CPU use by apps, the frameworkautomatically pulls the data at transition points (such as starting or stopping an activity) totake a snapshot.
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Resource consumption is associated with the application using the resource. When multipleapplications simultaneously use a resource (such as wakelocks that prevent the system fromsuspending), the framework spreads consumption across those applications, although not necessarilyequally.
To avoid losing use statistics for a shutdown event, which may indicate battery powerconsumption problems (i.e. shutdown occurs because the battery reached zero remaining capacity),the framework flashes statistics approximately every 30 minutes.
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Battery use statistics are handled entirely by the framework and do not require OEMmodifications.
Power profile values
Caution: Device manufacturers must provide a component powerprofile that defines the current consumption value for the component and the approximate batterydrain caused by the component over time. This profile is defined inplatform/frameworks/base/core/res/res/xml/power_profile.xml.For guidance on these settings, see Power Values.
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Within a power profile, power consumption is specified in milliamps (mA) of current draw at anominal voltage and can be a fractional value specified in microamps (uA). The value should be themA consumed at the battery and not a value applicable to a power rail that does not correspond tocurrent consumed from the battery.
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For example, a display power profile specifies the mA of current required to keep the display onat minimum brightness and at maximum brightness. To determine the power cost (i.e the batterydrained by the display component) of keeping the display on, the framework tracks the time spent ateach brightness level, then multiplies those time intervals by an interpolated display brightnesscost.
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The framework also multiplies the CPU time for each application by the mA required to run theCPU at a specific speed. This calculation establishes a comparative ranking of how much battery anapplication consumes by executing CPU code (time as the foreground app and total time includingbackground activity are reported separately).