Android performance tuning. Battery drain fixed. You can find useful links in the notes for each slide.

1. ANDROID
PERFORMANCE
TUNING
Batter y Drain fixed
SERGII KOZYREV
Android TeamLead
29.06.2017

2. BATTERY

3. Why we hate?

4. What is more important - preserved
battery or uploaded cat’s photo?

5. Battery drain options
•Screen
•Location Scanning
•Sensors
•Cellular Radio
•CPU

6. Where to start?

7. DEMO Battery Historian

8. Screen
•WakeLocks
•Can’t live without WakeLocks/Sound/Flash
•Need bright screen

9. Screen Fixed
•Remove WakeLocks (unless it’s payment)
•WakeLocks/Sound/Flash – don’t forget to
“close the door” and remove
•Need bright screen – learn from PlanetaKino

10. Location Scanning
•GPS (LocationManager vs LocationServices)
•Wi-Fi and BLE (use exponential back off)

11. Location Scanning Fixed
•GPS – use GeoFencing (100points, 2 min)
•Wi-Fi and BLE – ActivityLifecycleCallbacks as
BatterySaver

12. Sensors
•Accelerometer (Device, Rate etc.)
•Gyro

13. Sensors Fixed
•Accelerometer (Device, Rate etc.)
•Gyro
Significant motion (Sensor.TYPE_SIGNIFICANT_MOTION – one time trigger)
Geofencing

14. Networking

15. Simple but powerful
What we usually do for networking?

16. Simple but powerful
compile 'com.squareup.retrofit2:retrofit:2.3.0'
compile 'com.squareup.okhttp3:okhttp:3.4.1'
Retrofit retrofit = new Retrofit.Builder().client(new
OkHttpClient.Builder().build())
.baseUrl(getString(R.string.base_url))
.addConverterFactory(GsonConverterFactory.create(new
GsonBuilder().setLenient().create()))
.build()

17. Simple but powerful
if (response.isSuccessful() || response.isRedirect()) {
return response;
} else {

18. Simple but powerful
private boolean isNetworkConnected() {
ConnectivityManager connectivityManager =
(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
return (networkInfo != null && networkInfo.isConnected());
}
No connection, No request, no radio module power consumption, PROFIT!

19. Doze and AppStandby

20. What we need to know?
AppStandby
Touches: Application
Condition: App in background
Sync allowed: once per day
Doze
Touches: Device
Condition: Screen off & unplugged
Sync allowed: exponential window
Restricted: network, wakelocks, Alarm*, syncadapter, JobScheduler
How to fit: FCM or exclusions (settings allowed for
IM, Task automation, Peripheral Companion)

21. Reducing Network Battery Drain

22. Analyze and Fix

23. Tag Network Requests
if (Build.VERSION.SDK_INT >= 14) {
try {
TrafficStats.setThreadStatsTag(USER_INITIATED|APP_INITIATED|SERVER_INI
TIATED);
// make network request using HttpClient.execute()
} finally {
TrafficStats.clearThreadStatsTag();
}
}

24. Use DDMS
Bad
Good

25. Think and Act!
User-initiated traffic App-initiated traffic Server-initiated traffic
Pre-fetch Network Data
Use batch-requests
(multi-payload)
Batch and Schedule Requests Push(Gcm/Fcm), not pool

26. SyncAdapter – hard to implement and configure(account,
ContentProvider)
JobScheduler - Minimum API 21
Solution … Firebase JobDispatcher
DEMO

27. Thank You!