Becoming a Better Battery Citizen

From DroidCon Boston 2017 - In the 8 years since the release of the first commercial Android device, we’ve seen screen resolutions go from thousands of pixels to millions, cameras from 3MP to 13MP, and cores from 1 to 8 – but battery life is staying the same or even getting worse! This makes it even more important to be a good battery citizen and leave some juice for your users’ other apps (they do use apps other than yours, right?) In this session, we will explore the different battery tools and resources available for profiling – like Trepn Power Profiler and Battery Historian – and use them to identify common battery pain points in your app. We’ll also cover best practices for power-sensitive development so you can prevent battery drain problems from the beginning.

Transcript

1. Becoming a Better Battery Citizen April 10, 2017 Eric Brynsvold, Atlassian @ericbrynsvold #DroidConBos
2. Your App
3. Your App Background Processes Disk Storage Network Requests Push Notifications
4. Other App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications Your App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications
5. © Ben Patterson http://www.pcworld.com/ article/3061237/apple-phone/7-ways-to- keep-your-dying-android-phone-or-iphone- alive.html
6. 92% http://www.techtimes.com/articles/6928/20140514/dead-smartphone-battery-causes-stress-in-92-percent-of-britons.htm
9. VS
10. Tools
11. Trepn Profiler https://developer.qualcomm.com/software/trepn-power-profiler
13. Battery Historian
16. https://github.com/google/battery-historian
17. How To Use 5.0 - 6.0 adb bugreport > mybugreport.txt 7.0+ adb bugreport mybugreport.zip
18. How To Use
19. Running Multiple Tests adb shell dumpsys batterystats --reset
20. Running Multiple Tests
21. Running Multiple Tests
24. Worst Practices
25. Worst Practices • Scheduling frequent periodic alarms when not absolutely necessary • Syncing data too often • Not caching data • Abusing wakelocks
26. Worst Practices • Scheduling frequent periodic alarms when not absolutely necessary • Syncing data too often • Not caching data • Abusing wakelocks
27. Worst Practices • Scheduling frequent periodic alarms when not absolutely necessary • Syncing data too often • Not caching data • Abusing wakelocks
28. Worst Practices • Scheduling frequent periodic alarms when not absolutely necessary • Syncing data too often • Not caching data • Abusing wakelocks
29. Best Practices
30. JobScheduler Other App Background Processes Disk Storage Network Requests Push Notifications Your App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications
31. JobScheduler Other App Background Processes Disk Storage Network Requests Push Notifications Your App Background Processes Disk Storage Network Requests Push Notifications Other App Background Processes Disk Storage Network Requests Push Notifications
32. Potential Jobs to Schedule Long-running Periodic Heavy Data
33. Potential Jobs to Schedule Long-running Periodic Heavy Data Properties: Requires Device Idle, Any network condition, runs once
34. Potential Jobs to Schedule Long-running Periodic Heavy Data Properties: Unmetered network,
 Runs every 12 hours
35. Potential Jobs to Schedule Long-running Periodic Heavy Data Properties: Unmetered network,
 Run once
36. Potential Jobs to Schedule Long-running Periodic Heavy Data Properties: Requires network access, runs once
37. Potential Jobs to Schedule Long-running Periodic Heavy Data Properties: Requires charging, unmetered data, runs once
38. Scheduling Photo Backup JobScheduler scheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
 ComponentName componentName = new ComponentName(this, PhotoBackupService.class); PersistableBundle extrasBundle = new PersistableBundle(); extrasBundle.putString(“photoToBackup”, “SOME_STRING_ID”);
 
 JobInfo jobInfo = new JobInfo.Builder(1234, componentName)
 .setRequiredNetworkType(JobInfo.NETWORK_TYPE_UNMETERED)
 .setRequiresCharging(true) .setPersisted(true) .setExtras(extrasBundle);
 .build();
 
 scheduler.schedule(jobInfo);
39. Job Service public class PhotoBackupService extends JobService {
 
 @Override
 public boolean onStartJob(JobParameters jobParameters) { switch (jobParameters.getJobId()) {
 case 1234: String photoId = jobParameters.getExtras().getString(“photoToBackup”);
 // start new thread to do work, // call jobFinished(jobParameters, false); when done return true;
 } 
 return false;
 }
 
 @Override
 public boolean onStopJob(JobParameters jobParameters) {
 return false;
 }
 }
42. Firebase Job Dispatcher • https://github.com/firebase/firebase-jobdispatcher-android • API 9+ • Uses JobScheduler for API 21+ • Requires Google Play Services
43. Doze
45. Working with Doze • Test with Doze • AlarmManager • GCM • Whitelist
46. Working with Doze • Test with Doze: adb shell dumpsys deviceidle force-idle • AlarmManager • GCM • Whitelist
47. Working with Doze • Test with Doze • AlarmManager • GCM • Whitelist
48. Working with Doze • Test with Doze • AlarmManager • GCM • Whitelist
49. Working with Doze • Test with Doze • AlarmManager • GCM • Whitelist
50. Recap • Be Aware • Use Trepn and Battery Historian • No Worst Practices • Use Job Scheduler • Test with Doze
51. Recap • Be Aware • Use Trepn and Battery Historian • No Worst Practices • Use Job Scheduler • Test with Doze
52. Recap • Be Aware • Use Trepn and Battery Historian • No Worst Practices • Use Job Scheduler • Test with Doze
53. Recap • Be Aware • Use Trepn and Battery Historian • No Worst Practices • Use Job Scheduler • Test with Doze
54. Recap • Be Aware • Use Trepn and Battery Historian • No Worst Practices • Use Job Scheduler • Test with Doze
55. Thank You! @ericbrynsvold #DroidConBos