[Yonatan Levin] Knock knock! Who's there? Doze.

Presentation from GDG DevFest Ukraine 2016.
Learn more at: https://devfest.gdg.org.ua

Transcript

1. Yonatan Levin Google Developer Expert levin.yonatan parahall
2. 59 Cities > 20M users Ruby, Go, Python, Microservices
3. > 1300 members Largest Android Active Community
4. :) The story about the shy guy Doze Mode
9. Doze, the bro :) No network access No jobs/ No syncs No wakelocks No alarms No GPS / Wifi Scans
10. Doze Mode on Marshmallow
13. Not shy anymore
14. Doze Mode on Nougat
15. When? All intervals are configurable by Google/Manufacturer.
16. Statistics on OnePlus 3 (Marshmallow)
17. Statistics on Nexus 6P (Nougat)
18. Doze, sweet, Doze, Let me go...
19. Charge it...
20. AlarmManager setAndAllowWhileIdle() or setExactAndAllowWhileIdle(). Could be triggered only once in every 15 minutes But...
21. No network access
22. GCM/FCM Use FCM with High priority - but treat it with special care { "to" : "...", "priority" : "high", "notification" : { ... }, "data" : { ... } }
23. WhiteList • An app can fire the ACTION_IGNORE_BATTERY_OPTIMIZATION_SE TTINGS intent to take the user directly to the Battery Optimization, where they can add the app.
24. Note: Google Play policies prohibit apps from requesting direct exemption from Power Management features in Android 6.0+ (Doze and App Standby) unless the core function of the app is adversely affected.
25. And it’s not all, folks
26. CONNECTIVITY_CHANGES
29. My shiny new app git clone git@github.com:parahall/final_battle_doze.git
34. public class FinalBattleActivity public void onClick(View v) { switch (v.getId()) { case R.id.kill_button: StarWarsUtils.makeDecision( LukeDecision.LUKE_KILL_DARTH_VADER, this); break; case R.id.light_side_button: StarWarsUtils.makeDecision( LukeDecision.STAY_ON_LIGHT_SIDE, this); Break; } }
35. public class StarWarsUtils { public static void makeDecision(LukeDecision decision,Context context) { Intent nowIntent = new Intent(context, NowIntentService.class); nowIntent.putExtra(..., decision); context.startService(nowIntent); }
36. public class NowIntentService extends IntentService { protected void onHandleIntent(Intent intent) { LukeDecision decision = (LukeDecision)intent.getSerializableExtra(...); if (decision != null) { makeNetworkCall(decision); } ... }
37. public class NowIntentService extends IntentService { private void makeNetworkCall(LukeDecision decision) { boolean isCompleted = false; if(StarWarsUtils.isNetworkActive()) { isCompleted = doingNetworkCommunication(); } ... }
38. public class NowIntentService extends IntentService { private void makeNetworkCall(LukeDecision decision) { ... if (!isCompleted) { StarWarsUtils.addRetryTask(decision, this); return; } ... }
39. How we will retry the request if it’s failed?
40. Connectivity Manager
41. AndroidManifest.xml <receiver android:name=".ConnectivityChangeReceiver"> <intent-filter> <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/> </intent-filter> </receiver>
42. public void onReceive(Context context, Intent intent) { LukeDecision decisionToRetry = StarWarsUtils.getDecisionToRetry(context); StarWarsUtils.makeDecision(decisionToRetry, context); } public class ConnectivityChangeReceiver extends WakefulBroadcastReceiver
44. Han Solo reporting to Rebels
46. public class FinalBattleActivity extends AppCompatActivity protected void onCreate(Bundle savedInstanceState) { ... scheduleHanSoloReport(); ... }
47. public class FinalBattleActivity extends AppCompatActivity private void scheduleHanSoloReport() { AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); PendingIntent broadcast = getPendingIntent(); alarmManager.setRepeating( AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), ONE_MINUTE, broadcast); }
48. public class HanSoloReceiver public void onReceive(Context context, Intent intent) { LocationManager locationService = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE); PendingIntent pendingIntent = getPendingIntent(context); String provider = getLocationProvider(locationService); locationService.requestSingleUpdate(provider, pendingIntent); }
49. public class NowIntentService extends IntentService { @Override protected void onHandleIntent(Intent intent) { ... Location HanSoloLocation = intent.getParcelableExtra(LocationManager.KEY_LOCATION_CHANGED); if (HanSoloLocation != null) { checkIfRebelsReady(HanSoloLocation); } }
50. RebelService
51. public class RebelService extends Service implements Handler.Callback public void onCreate() { handlerThread = new HandlerThread("RebelServiceHandlerThread"); handlerThread.start(); Looper looper = handlerThread.getLooper(); handler = new Handler(looper, this); handler.sendEmptyMessage(WHAT_MAKE_NETWORK_REQUEST); }
52. public class RebelService extends Service implements Handler.Callback @Override public boolean handleMessage(Message msg) { StarWarsUtils.doingNetworkCommunication(); handler.sendEmptyMessageDelayed( WHAT_MAKE_NETWORK_REQUEST, DELAY_MILLIS); return true; }
53. So what is affected by Doze my app?
54. What is affected - Pending network transactions will never be fired... - Han Solo Alarms will be postponed. - No location updates But...
55. There is still some place for...
56. JobScheduler/GCMNetworkManager
57. What? Schedule the task to execute it when certain conditions met. (charging, idle, connected to a network or connected to an unmetered network)
58. Why two? JobScheduler was introduced in API >= 21 (Lollipop). GCMNetworkManager - is part of GCM package. When using on devices >= 21, use JobScheduler underneath.
59. build.gradle dependencies { ... compile 'com.google.android.gms:play-services-gcm:9.4.0' ... }
60. public class StarWarsUtilities void addRetryTask(LukeDecision decision,Context context){ GcmNetworkManager gcmNetworkManager = GcmNetworkManager.getInstance(context); … }
61. public class StarWarsUtilities Task task = new OneoffTask.Builder().setService(BestTimeService.class) .setExecutionWindow(0, 30) .setTag(BestTimeService.LUKE_DECISION) .setUpdateCurrent(false) .setRequiredNetwork(Task.NETWORK_STATE_CONNECTED) .setRequiresCharging(false) .setExtras(bundle) .build();
62. public class StarWarsUtilities void addRetryTask(LukeDecision decision,Context context){ ... gcmNetworkManager.schedule(task); }
63. AndroidManifest.xml <service android:name=".BestTimeService" android:permission="com.google.android.gms.permission.BIND_NETWORK_TASK_SERVICE" android:exported="true"> <intent-filter> <action android:name="com.google.android.gms.gcm.ACTION_TASK_READY"/> </intent-filter> </service>
64. BestTimeService.java /** * Task run by GcmNetworkManager when all the requirements of the scheduled * task are met. */ public class BestTimeService extends GcmTaskService { ... }
65. BestTimeService.java @Override public int onRunTask(TaskParams taskParams) { switch (taskParams.getTag()) { case LUKE_DECISION: ... return GcmNetworkManager.RESULT_SUCCESS; case HAN_SOLO_LOCATION: ... return GcmNetworkManager.RESULT_RESCHEDULE; default: return GcmNetworkManager.RESULT_FAILURE; } }
66. BestTimeService.java public int onRunTask(TaskParams taskParams) { … case LUKE_DECISION: Bundle extras = taskParams.getExtras(); LukeDecision decision = (LukeDecision) extras.getSerializable(...); StarWarsUtils.makeDecision(decision, this); return GcmNetworkManager.RESULT_SUCCESS; … }
67. Han Solo Recurring Location task?
68. Task task = new PeriodicTask.Builder() .setService(BestTimeService.class) .setPeriod(SIXTY_SEC) .setFlex(10) .setTag(BestTimeService.HAN_SOLO_LOCATION) .setPersisted(true) .build(); public class FinalBattleActivity
69. BestTimeService.java public int onRunTask(TaskParams taskParams) { … case HAN_SOLO_LOCATION: .. request location... return GcmNetworkManager.RESULT_SUCCESS; … }
70. Canceling Task mGcmNetworkManager.cancelAllTasks(BestTimeService.class); mGcmNetworkManager.cancelTask( TAG, BestTimeService.class );
71. There is a problem hiding here
72. Not all devices shipped with Play Services int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this); if (resultCode == ConnectionResult.SUCCESS) { mGcmNetworkManager.schedule(task); } else { // Deal with this networking task some other way }
73. When Google Play updated it removes all scheduled periodic tasks public class BestTimeService extends GcmTaskService { @Override public void onInitializeTasks() { super.onInitializeTasks(); // Reschedule removed tasks here } }
74. Can we do better?
75. FCM/GCM with High Priority { "to" : "...", "priority" : "high", "notification" : { ... }, "data" : { ... } }
76. AndroidManifest.xml <service android:name=".RebelsMessagingService"> <intent-filter> <action android:name="com.google.firebase.MESSAGING_EVENT"/> </intent-filter> </service>
77. public class RebelsMessagingService extends FirebaseMessagingService @Override public void onMessageReceived(RemoteMessage remoteMessage) { Intent intent = new Intent(HanSoloReceiver.ACTION); LocalBroadcastManager. getInstance(this). sendBroadcast(intent); }
78. Some dirty tricks. Be aware when using it…
79. public class RebelService extends Service implements Handler.Callback public boolean handleMessage(Message msg) { StarWarsUtils.doingNetworkCommunication()); handler.sendEmptyMessageDelayed( WHAT_MAKE_NETWORK_REQUEST, DELAY_MILLIS); return true; }
80. public class RebelService extends Service implements Handler.Callback public void onCreate() { Notification notification = ... startForeground(101, notification); }
82. Yonatan Levin Google Developer Expert levin.yonatan parahall