JobScheduler is the Unavoidable Better Future Eric Cochran Droidcon NYC September 29, 2016

Credit @volumedownpower

3 Some explanatory text to introduce the theme of the deck and such. AlarmManager AlarmManager manager = (AlarmManager) context.getSystemService(ALARM_SERVICE);
 Intent intent = new Intent(context, SyncJobService.class);
 manager.setInexactRepeating(ELAPSED_REALTIME,
 SystemClock.elapsedRealtime() + INTERVAL_MILLIS, INTERVAL_MILLIS,
 PendingIntent.getService(context, REQUEST_CODE, intent, FLAG_CANCEL_CURRENT));

4 Some explanatory text to introduce the theme of the deck and such. AlarmManager public final class RescheduleAlarmsReceiver extends BroadcastReceiver {
 @Override public void onReceive(Context context, Intent intent) {
 // Reschedule.
 }
 } 
 
 
 


5 AlarmManager Persistence? Failures and retries?

6 Some explanatory text to introduce the theme of the deck and such. Broadcasts android.net.conn.CONNECTIVITY_CHANGE android.hardware.action.NEW_PICTURE android.hardware.action.NEW_VIDEO and more…

7 Context-aware Reduce complexity JobScheduler

8 JobInfo.Builder exponential backoff persisted across reboots maximum delay charging network type device idle Creating a Job

9 JobInfo.Builder addTriggerContentUri (android.hardware.action.NEW_PICTURE) Creating a Job

10 JobScheduler scheduler = (JobScheduler) context.getSystemService(JOB_SCHEDULER_SERVICE);
 ComponentName jobService = new ComponentName(context, SyncJobService.class);
 JobInfo job = new JobInfo.Builder(jobId, jobService)
 /*
 More options here.
 */
 .build();
 scheduler.schedule(job); JobScheduler

11 public final class SyncJobService extends JobService {
 @Override public boolean onStartJob(final JobParameters params) {
 // Wakelock held.
 // Run on main thread.
 final AtomicBoolean moreWorkToBeDone = new AtomicBoolean(true);
 work.enqueue(new Callback() {
 @Override result(boolean success) {
 moreWorkToBeDone.set(false);
 boolean needsReschedule = !success; // Wakelock released.
 jobFinished(params, needsReschedule);
 }
 });
 return moreWorkToBeDone.get();
 }
 
 @Override public boolean onStopJob(JobParameters params) {
 // Wakelock released.
 boolean reschedule = true;
 return reschedule;
 }
 } JobScheduler

12 JobScheduler

13 For more than Lollipop GcmNetworkManager

14 new PeriodicTask.Builder()
 .setService(SyncTaskService.class)
 .setTag(jobId)
 .setUpdateCurrent(true) // Override existing task with equal tag.
 .setPersisted(true) // Requires permission, of course.
 .setRequiredNetwork(NETWORK_STATE_UNMETERED)
 .setRequiresCharging(true)
 .setPeriod(INTERVAL_SECONDS) // Required. In seconds.
 .build(); GcmNetworkManager

15 new OneoffTask.Builder()
 .setService(SyncTaskService.class)
 .setTag(jobId)
 .setExecutionWindow(0, 60); // Required. In seconds. .build(); GcmNetworkManager

16 
 
 
 
 GcmNetworkManager

17 public final class SyncTaskService extends GcmTaskService {
 @Override public int onRunTask(TaskParams taskParams) {
 // Wake lock held for about three minutes.
 // Run on background thread. Must be thread-safe.
 boolean success = work.execute();
 if (success) {
 return RESULT_SUCCESS;
 }
 return useBackoffReschedule ? RESULT_RESCHEDULE : RESULT_FAILURE;
 }
 
 @Override public void onInitializeTasks() {
 // Run on main thread after GPS or app update.
 // Reschedule all Tasks.
 }
 } GcmNetworkManager

18 What about Firebase JobDispatcher? Pluggable Drivers to wrap GCM, JobScheduler, AlarmManager, etc. But, almost certainly abandoned without a DEPRECATED label.

19 JS JobScheduler vs GCM Network Manager GCM API 21+ Configurable initial backoff and linear or exponential backoff Persistent More configurable and suitable for wide range of usecases Devices with Google Play Services Exponential backoff Requires persistent backing data to reschedule after update Targeted at quick network requests

20 Great Abstraction for Tasks. Not a Perfect Transition from Broadcasts.

21 @Eric_Cochran github.com/NightlyNexus nightlynexus.com