Doze Mode & App Standby in Android M

Android Marshmallow brings major changes to the platform which can limit functionality of existing apps. If you are doing any background work in your app, your app will be affected by Doze &App Standby in favour of longer battery life. Let’s see what APIs will be limited and what are the best practices for scheduling background tasks.

Transcript

1. Doze Mode
   & App Standby
   in Android M
   David Vávra, GDE
   +David Vávra
   @destil
   

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2. Why?
   

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3. Doze mode
   Triggered when:
   not charging && stationary && screen is off
   

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4. App Standby
   Per-app Doze
   App is in standby when:
   no Activities && no notifications && not charging
   App is woken once a day for a brief time
   

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5. Android Scheduling APIs SyncManager
   

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6. Doze Mode SyncManager
   no wakelocks
   no network
   10 s of network & wakelock, only once in 15 mins
   Device exits Doze
   

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7. App Standby SyncManager
   wakelocks work
   no network
   

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8. The golden ticket
   High-priority GCM message.
   But:
   Doesn’t work offline.
   You might use different provider (Parse, SIP)
   No SLA
   

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9. Opting out
   partial wakelock for Doze, no App Standby
   Intent intent = new Intent(Settings.
   ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS);
   intent.setData(Uri.parse("package:com.example.app"));
   startActivity(intent);
   Intent intent = new Intent(Settings.
   REQUEST_IGNORE_BATTERY_OPTIMIZATIONS);
   intent.setData(Uri.parse("package:com.example.app"));
   startActivity(intent);
   android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS
   Only valid use-cases! Break core feature, can’t use GCM
   

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10. Testing
    $ adb shell dumpsys battery unplug
    $ adb shell dumpsys deviceidle step
    $ adb shell am set-inactive true
    $ adb shell am get-inactive
    

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11. More details
    Detect whether the device is in Doze with
    PowerManager#isDeviceIdleMode()
    Detect is your app is whitelisted with
    isIgnoringBatteryOptimizations(String package)
    If you schedule more alarms, they are all triggered after
    exiting Doze.
    Doze/App Standby doesn’t work on devices without
    Google Play Services.
    

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12. More details
    Maintenance windows: 5-10 mins, period 1, 2, 4, 6, 6, 6 hours.
    ContentProviders in the dozed app should work.
    Doze disables before user is woken by alarm clock to let apps
    synchronize.
    Apps with foreground service are not affected by Doze.
    You can register to android.os.action.
    DEVICE_IDLE_MODE_CHANGED
    

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13. But…
    that will break my app!
    Use-cases & solutions
    

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14. Use-case #1: Instant Messenger
    The app should notify me
    instantly when I receive a new
    message.
    Solution:
    High-priority GCM message.
    or white-listing
    

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15. Use-case #2: SMS Manager
    The app should notify about
    incoming SMS immediately.
    Solution:
    Some Broadcasts like
    SMS_RECEIVED works.
    

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16. Use-case #3: Sleep Tracker
    The app should monitor user’s
    sleep using accelerometer and
    microphone.
    Solution:
    Ask user to plug it into charger
    Whitelist & Foreground service
    & Wakelock (buggy)
    

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17. Use-case 4#: Periodic Backup
    The app should backup user’s
    photos periodically to the
    cloud.
    Solution:
    GCM Network Manager with
    network & charge
    requirement
    Foreground service for
    downloading
    

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18. Use-case #5: Podcast Downloader
    The app should download
    subscribed podcasts at night so
    they are ready for offline
    listening when I drive to work.
    Solution:
    GCM Network Manager with
    network requirement
    Foreground service for
    downloading
    Reschedule if fails
    

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19. Use-case #6: Anti-Theft
    The app should be invisible and
    should allow remove control of
    the device.
    Solution:
    Whitelisting
    Use high-priority GCM & SMS
    to control device
    

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20. Sources
    https://developer.android.com/preview/features/power-mgmt.html
    https://developers.google.com/cloud-messaging/network-manager
    https://commonsware.com/blog/2015/06/03/random-musing-m-developer-
    preview-ugly-part-one.html
    https://plus.google.com/+AndroidDevelopers/posts/GdNrQciPwqo
    https://plus.google.com/u/0/+TomasHubalek/posts/NXZdkR29h9m
    https://code.google.com/p/android-developer-preview/issues/detail?id=2233
    

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21. We welcome talented Android Developers
    To Prague - nice relocation package :)
    http://avast.jobs.cz or ping me at vavra@avast.com
    

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22. Q&A
    +David Vávra
    @destil
    

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