The document discusses battery optimization techniques for Android apps that enhance performance while conserving battery life, utilizing features like Job Scheduler API and Android Doze. It emphasizes the importance of monitoring device state and network connectivity to manage background tasks efficiently, and touches on methods such as Google Cloud Messaging and inexact repeating alarms to reduce unnecessary battery drain. Key practices include adjusting update frequencies based on user engagement and leveraging caching to avoid redundant downloads.

1. Battery Optimization:
Android Apps
With Best Practices for Zero Compromise on
Performance

2. 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 doesn’t perform task based on time but based on condition.

3. JOB Scheduler API

4. JOB Scheduler API Code Snippet

5. 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.

6. Android Doze

7. 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.

8. Android Doze Extended

9. 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.

10. 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.

11. Doze Optimization
Whether the smartphone is stationary or not, when the screen is off for a while
means user isn’t engaged with the device and that is an opportunity to
conserve the battery power.

12. App Standby
App Standby is designed to limit the background syncs and tasks for apps that
user isn’t interested at the moment.

13. App Standby

14. 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.
Monitoring the Battery Level and Charging
State

15. Monitoring the Battery Level and Charging
State

16. Code Snippet to determine Charging State
and Method
// Are we charging / charged?
int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
status == BatteryManager.BATTERY_STATUS_FULL;
// How are we charging?
int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;

17. 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

18. 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.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();

19. 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.

20. Key Steps to Minimize Server Updates and
Optimize the Battery Drain

21. 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

22. 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

23. 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