HealthStats

public class HealthStats
extends Object

A HealthStats object contains system health data about an application.

Data Types
Each of the keys references data in one of five data types:

A measurement metric contains a single long value. That value may be a count, a time, or some other type of value. The unit for a measurement (COUNT, MS, etc) will always be in the name of the constant for the key to retrieve it. For example, the UidHealthStats.MEASUREMENT_WIFI_TX_MS value is the number of milliseconds (ms) that were spent transmitting on wifi by an application. The UidHealthStats.MEASUREMENT_MOBILE_RX_PACKETS measurement is the number of packets received on behalf of an application. The UidHealthStats.MEASUREMENT_TOUCH_USER_ACTIVITY_COUNT measurement is the number of times the user touched the screen, causing the screen to stay awake.

A timer metric contains an int count and a long time, measured in milliseconds. Timers track how many times a resource was used, and the total duration for that usage. For example, the UidHealthStats.TIMER_FLASHLIGHT timer tracks how many times the application turned on the flashlight, and for how many milliseconds total it kept it on.

A measurement map metric is a mapping of String names to Long values. The names typically are application provided names. For example, the PackageHealthStats.MEASUREMENTS_WAKEUP_ALARMS_COUNT measurement map is a mapping of the tag provided to the AlarmManager when the alarm is scheduled.

A timer map metric is a mapping of String names to TimerStat objects. The names are typically application provided names. For example, the UidHealthStats.TIMERS_WAKELOCKS_PARTIAL is a mapping of tag provided to the PowerManager when the wakelock is created to the number of times and for how long each wakelock was active.

Lastly, a health stats metric is a mapping of String names to a recursive HealthStats object containing more detailed information. For example, the UidHealthStats.STATS_PACKAGES metric is a mapping of the package names for each of the APKs sharing a uid to the information recorded for that apk. The returned HealthStats objects will each be associated with a different set of constants. For the HealthStats returned for UidHealthStats.STATS_PACKAGES, the keys come from the PackageHealthStats class.

The keys that are available are subject to change, depending on what a particular device or software version is capable of recording. Applications must handle the absence of data without crashing.

Summary

Public methods

public String getDataType ()

public long getMeasurement (int key)

public int getMeasurementKeyAt (int index)

public int getMeasurementKeyCount ()

public Map<String, Long> getMeasurements (int key)

public int getMeasurementsKeyAt (int index)

public int getMeasurementsKeyCount ()

public Map<String, HealthStats> getStats (int key)

public int getStatsKeyAt (int index)

public int getStatsKeyCount ()

public TimerStat getTimer (int key)

public int getTimerCount (int key)

public int getTimerKeyAt (int index)

public int getTimerKeyCount ()

public long getTimerTime (int key)

public Map<String, TimerStat> getTimers (int key)

public int getTimersKeyAt (int index)

public int getTimersKeyCount ()

public boolean hasMeasurement (int key)

public boolean hasMeasurements (int key)

public boolean hasStats (int key)

public boolean hasTimer (int key)

public boolean hasTimers (int key)