How to Optimize Battery for Android

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Battery Optimization Android Apps

• With Best Practices for Zero Compromise on
• Performance

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JOB Scheduler API

• For efficient use of android resources and
  smartly handles background tasks in a manner to
  improve battery life also.
• As it operates at the system level hence capable
  of smartly scheduling background task to run
  along with jobs from other apps hence minimizes
  radio usage a major battery drainage issue.
• It doesnt perform task based on time but based
  on condition.

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JOB Scheduler API
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JOB Scheduler API Code Snippet
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Android Doze

• When smartphone is kept idle for hours usually
  during night with screen off and the device is
  stationary, this might drain some battery.
• Now android doze is triggered and it will defer
  the background tasks, syncs, alarms and Wi-Fi
  scan until a maintenance window is scheduled.
• Doze will batch all background activities inside
  a single batch to extend battery life by good
  margin.

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Android Doze
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Android Doze Extended

• When device is in pocket (not stationary) with
  screen off.
• the lighter doze version will be active and
  restrict lesser number of background tasks.
• During this time there will be regular
  maintenance windows.

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Android Doze Extended
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Doze Modes Comparison

• Extended doze mode produce maintenance window at
  short interval to ensure apps are ready when user
  wants to use the device again.

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Doze Optimization

• High Priority GSM messages are the best method to
  deliver the time critical messages to the app. It
  enables app to access the network to ensure
  important notifications reach the user

• Foreground services will continue to work despite
  the ongoing battery optimization.

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Doze Optimization

• Whether the smartphone is stationary or not, when
  the screen is off for a while means user isnt
  engaged with the device and that is an
  opportunity to conserve the battery power.

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App Standby

• App Standby is designed to limit the background
  syncs and tasks for apps that user isnt
  interested at the moment.

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App Standby
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Monitoring the Battery Level and Charging State

• It is good practise to notice battery level and
  charging state before performing application
  update. If the device is charging over AC(wall
  charger) refresh rate can be maximised without
  affecting battery life. In case device is
  unplugged limiting the update rate will help in
  maximising battery life.

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Monitoring the Battery Level and Charging State
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Code Snippet to determine Charging State and
Method

• // Are we charging / charged?
• int status batteryStatus.getIntExtra(BatteryMana
  ger.EXTRA_STATUS, -1)
• boolean isCharging status BatteryManager.BATT
  ERY_STATUS_CHARGING
• status BatteryManager.BATT
  ERY_STATUS_FULL
• // How are we charging?
• int chargePlug batteryStatus.getIntExtra(Battery
  Manager.EXTRA_PLUGGED, -1)
• boolean usbCharge chargePlug
  BatteryManager.BATTERY_PLUGGED_USB
• boolean acCharge chargePlug
  BatteryManager.BATTERY_PLUGGED_AC

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Monitor Connectivity State to Limit Battery Drain

• Background services schedule updates to an
  application. They do it on behalf of internet
  resources and cache data.
• This schedule can negatively impact battery life
  takes place especially during no internet state
  or weak internet connection.
• You can handle this tricky situation smartly by
  knowing the device connectivity status with
  connectivity manager

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Monitor Connectivity State to Limit Battery Drain

• Connectivity manager will also help in decoding
  the connection category and accordingly you can
  decide either to continue with an update to the
  application or restrict it now.
• Connectivity manager code snippet to query the
  active network and subsequent internet
  connectivity.
• ConnectivityManager cm
• (ConnectivityManager)context.getSystemServ
  ice(Context.CONNECTIVITY_SERVICE)
• NetworkInfo activeNetwork cm.getActiveNetworkInf
  o()
• boolean isConnected activeNetwork ! null
• activeNetwork.isConnectedOrC
  onnecting()

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Key Steps required to Minimize Server Updates and
Optimize the Battery Drain

• An Android application needs to activate the
  wireless radio and create the connection to check
  the available updates on the server. This will
  cause unnecessary battery drain.
• Once we understand the device state, network
  connectivity and user behavior then accordingly
  periodic update can be scheduled.

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Key Steps to Minimize Server Updates and Optimize
the Battery Drain
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Key Steps required to Minimize Server Updates and
Optimize the Battery Drain

• Google Cloud Messaging A mobile notification
  service via which server will notify the
  application when data is available for download.
  All apps which require periodic updates from a
  remote server can utilise this service which
  ensure update notifications to the app are
  carried out using single GCM connection. This
  approach will reduce unnecessary connections to
  check for periodic updates as a new connection is
  created only when an update is available

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Key Steps to Minimize Server Updates and Optimize
the Battery Drain

• Set the frequency to minimum Another way to
  optimize is to set the update frequency as low
  as possible at the same time ensuring zero
  negative impact on user experience. This will
  make the best balance between battery usage and
  data updates.
• Inexact Repeating Alarms If multiple alarms are
  set to go off around the same time then android
  can phase shift the alarm fire time for various
  application in a manner that all these apps will
  receive the alarm at the same time. This will
  allow all applications to perform network updates
  with a single

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Key Steps to Minimize Server Updates and Optimize
the Battery Drain

• activation of wireless radio.
• Exponential back-off methods In this method
  updates are scheduled after close monitoring the
  app usage and reduce update frequency
  dynamically, generally frequency is reduced for
  the apps which have not been used after the last
  update.
• HTTP Cache and HTTP Response Cache This
  technique is used to avoid downloading duplicate
  files by keeping them in case. Such files once
  stored inside case directory thereby, eliminating
  the need to download it every time

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