android.os.health

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The android.os.health package contains a set of classes to provide data to track the system resources of applications.

Applications running in the background are responsible for a significant amount of battery usage on a typical android device. There are several things that applications can do in order to reduce their impact. For example, by using JobScheduler, an application does not need to independently monitor whether the network is available, whether the device is plugged in, etc. In addition to being simpler to use, the application's services are only started when the required conditions have been met. But even when using the appropriate helper APIs, applications still can reduce their footprint. This package provides more insight into what is going on behind the scenes when an application is running.

Application data is tracked by which user id (uid) is using particular resources. A snapshot of an application's measurements can be taken with the SystemHealth.takeMyUidSnapshot() method. The HealthStats object returned contains the statistics.

HealthStats
In order to be returned efficiently, the HealthStats class uses a set of int keys to identify the data returned. The UidHealthStats, PidHealthStats, PackageHealthStats , ProcessHealthStats, and ServiceHealthStats classes provide those constants. Each HealthStats object will be associated with exactly one of those classes. The object returned from SystemHealth.takeMyUidSnapshot() will be using the UidHealthStats keys, as it contains all of the data available for that uid.

Classes

HealthStats	A HealthStats object contains system health data about an application.
PackageHealthStats	Keys for HealthStats returned from HealthStats.getStats(int) with the UidHealthStats.STATS_PACKAGES key.
PidHealthStats	Keys for HealthStats returned from HealthStats.getStats(int) with the UidHealthStats.STATS_PIDS key.
ProcessHealthStats	Keys for HealthStats returned from HealthStats.getStats(int) with the UidHealthStats.STATS_PROCESSES key.
ServiceHealthStats	Keys for HealthStats returned from HealthStats.getStats(int) with the PackageHealthStats.STATS_SERVICES key.
SystemHealthManager	Provides access to data about how various system resources are used by applications.
TimerStat	A TimerStat object stores a count and a time.
UidHealthStats	Keys for HealthStats returned from SystemHealthManager.takeUidSnapshot(int), SystemHealthManager.takeMyUidSnapshot(), and SystemHealthManager.takeUidSnapshots(int[]).