No internet? No Problem!
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At Off Grid Electric our mission is to power homes across rural Africa with affordable, solar energy. In order to do that we need to provide our employees with tools that work both on and offline. So how did we do it? In this talk, learn about the techniques we employed to provide a unique online-offline experience in our Android applications. We’ll discuss the overall architecture, third party libraries used, and some of the challenges that we faced. As more and more users come online in various parts of the world it makes sense for companies to begin exploring how they can modify their applications to be more network-friendly. This talk will get you headed in the right direction!
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No internet? No Problem!
- 2. OFF GRID ELECTRIC From: https://medium.com/@Offgrid
- 5. CHALLENGES
- 8. 3G COVERAGE IN ARUSHA, TZ
- 9. 4G LTE COVERAGE IN WASHINGTON, DC
- 11. ARCHITECTURE
- 12. BE USEFUL Our App ‣Store data locally ‣Separate UI and network ‣Queue requests
- 14. EVENT BUS/RXJAVA DATABASE REPOSITORY REPOSITORY ACTIVITY FRAGMENT JOBS PRESENTER PRESENTER SERVICE
- 16. DISPLAY A VIEW Is pre-populated data needed?
- 17. EVENT BUS/RXJAVA FRAGMENT PRESENTER SERVICE REPOSITORY DATABASE
- 18. TAKE AN ACTION Is the Network Available?
- 19. EVENT BUS/RXJAVA FRAGMENT PRESENTER SERVICE REPOSITORY DATABASE JOB
- 20. APP SERVER
- 26. EVENT BUS/RXJAVA DATABASE REPOSITORY REPOSITORY ACTIVITY FRAGMENT JOBS PRESENTER PRESENTER SERVICE
- 27. LIBRARIES
- 31. REALM - MODEL CLASS @RealmClass public class Place implements RealmModel { }
- 32. REALM - MODEL CLASS @RealmClass public class Place implements RealmModel { @PrimaryKey private String localId; @Index private Long remoteId; private Gps location; … }
- 33. REALM - MODEL CLASS localId remoteId location 19444498-2a40… 1458260 65031f36-bde9… e85c9757-f546…
- 34. REALM - ADDING A RECORD public class PlaceRepository implements Repository<Place> { @Override public void add (final Place item) { } …
- 35. REALM - ADDING A RECORD public class PlaceRepository implements Repository<Place> { @Override public void add (final Place item) { Realm realm = Realm.getDefaultInstance(); realm.executeTransaction((realm) -> { realm.insertOrUpdate(item); }); realm.close(); } …
- 36. REALM - QUERY RESULT @Override public Place toResult (Realm realm) { return realm.where(Place.class) }
- 37. REALM - QUERY RESULT @Override public Place toResult (Realm realm) { return realm.where(Place.class) .equalTo(PLACE_ID, placeId) .findFirst(); }
- 38. REALM - QUERY RESULT @Override public Place toResult (Realm realm) { return realm.where(Place.class) .equalTo(PLACE_ID, placeId) .findFirst(); }
- 42. EVENTBUS - SETUP @Provides @Singleton public Bus provideBus () { return new Bus(EventBus.builder() .logNoSubscriberMessages(BuildConfig.DEBUG) .throwSubscriberException(false) .build()); }
- 43. EVENTBUS - REGISTER public class LeadsMapPresenter { private final Bus bus; private LeadsMapView leadsMapView; @Inject LeadsMapPresenter (Bus bus) { this.bus = bus; } …
- 44. EVENTBUS - REGISTER public class LeadsMapPresenter { public void attachView (LeadsMapView view) { this.leadsMapView = view; bus.register(this); }
- 45. EVENTBUS - REGISTER public class LeadsMapPresenter { public void attachView (LeadsMapView view) { … } public void detachView () { this.leadsMapView = null; bus.unregister(this); }
- 46. EVENT BUS/RXJAVA FRAGMENT PRESENTER SERVICE REPOSITORY DATABASE JOB
- 47. EVENTBUS - POST EVENT api.submitPlace(place).enqueue(new Callback<Place>() { … JOB
- 48. EVENTBUS - POST EVENT api.submitPlace(place).enqueue(new Callback<Place>() { public void onResponse (…, Response<Place> response) { if (response.isSuccessful()) { } … JOB
- 49. EVENTBUS - POST EVENT api.submitPlace(place).enqueue(new Callback<Place>() { public void onResponse (…, Response<Place> response) { if (response.isSuccessful()) { Place updatedPlace = response.body(); bus.post(new PlaceSubmissionSuccessEvent(updatedPlace)); } … JOB
- 50. EVENTBUS - RETRIEVE EVENT public class LeadsMapPresenter { @Subscribe public void handle (PlaceSubmissionSuccessEvent event) { leadsMapView.displaySuccessMessage(); } … PRESENTER
- 51. EVENTBUS - SEND STATUS BAR NOTIFICATION SERVICE
- 52. EVENTBUS - SEND STATUS BAR NOTIFICATION SERVICE @Subscribe(priority = 1) open fun onEvent(event: PaymentSuccessEvent) { }
- 53. EVENTBUS - SEND STATUS BAR NOTIFICATION SERVICE @Subscribe(priority = 1) open fun onEvent(event: PaymentSuccessEvent) { val notif = getString(R.string.payment_submitted_message) createNotification(notif, 1) }
- 55. QUEUE REQUESTS
- 58. ANDROID JOB
- 59. ANDROID JOB ‣Alarm Manager ‣Job Scheduler ‣GCM Network Manager
- 60. ANDROID JOB - COMPARISON Library Min API Google Play? JobScheduler 21 No Firebase Job Dispatcher 9 Yes Android Job 14 No
- 61. ANDROID JOB JOB MANAGER JOB CREATOR
- 62. ANDROID JOB JOB MANAGER PROVIDER JOB JOB CREATOR PROVIDER JOB PROVIDER JOB
- 63. ANDROID JOB JOB MANAGER PROVIDER JOB JOB CREATOR PROVIDER JOB PROVIDER JOB JOB REQUEST
- 64. ANDROID JOB JOB MANAGER PROVIDER JOB JOB CREATOR PROVIDER JOB PROVIDER JOB JOB REQUEST JOB
- 65. ANDROID JOB - CREATOR public class ConfettiJobCreator implements JobCreator { Map<String, Provider<Job>> jobs; public Job create (String tag) { } }
- 66. ANDROID JOB - CREATOR public Job create (String tag) { Provider<Job> jobProvider = jobs.get(tag); return jobProvider.get(); }
- 67. ANDROID JOB JOB MANAGER PROVIDER JOB JOB CREATOR JOB REQUEST JOB
- 68. ANDROID JOB - JOB EXECUTION protected Result onRunJob (final Params params) { } JOB
- 69. ANDROID JOB - JOB EXECUTION protected Result onRunJob (final Params params) { PersistableBundleCompat extras = params.getExtras(); String placeId = extras.getString(PARAM_PLACE_ID); } JOB
- 70. ANDROID JOB - JOB EXECUTION protected Result onRunJob (final Params params) { PersistableBundleCompat extras = params.getExtras(); String placeId = extras.getString(PARAM_PLACE_ID); return submitRequest(placeId) ? SUCCESS: FAILURE; } JOB
- 71. ANDROID JOB JOB MANAGER PROVIDER JOB JOB CREATOR JOB REQUEST JOB
- 72. ANDROID JOB - SCHEDULING public static JobRequest get (String placeId) { PersistableBundleCompat extras = …; extras.putString(PARAM_PLACE_ID, placeId); }
- 73. ANDROID JOB - SCHEDULING public static JobRequest get (String placeId) { PersistableBundleCompat extras = …; extras.putString(PARAM_PLACE_ID, placeId); return new JobRequest.Builder(SendPlaceRequestJob.JOB_TAG) }
- 74. ANDROID JOB - SCHEDULING public static JobRequest get (String placeId) { PersistableBundleCompat extras = …; extras.putString(PARAM_PLACE_ID, placeId); return new JobRequest.Builder(SendPlaceRequestJob.JOB_TAG) .setExecutionWindow(10_000L, 20_000L) .setRequiredNetworkType(NetworkType.CONNECTED) }
- 75. ANDROID JOB - SCHEDULING public static JobRequest get (String placeId) { PersistableBundleCompat extras = …; extras.putString(PARAM_PLACE_ID, placeId); return new JobRequest.Builder(SendPlaceRequestJob.JOB_TAG) .setExecutionWindow(10_000L, 20_000L) .setRequiredNetworkType(NetworkType.CONNECTED) .setExtras(extras) }
- 76. ANDROID JOB - SCHEDULING public static JobRequest get (String placeId) { PersistableBundleCompat extras = …; extras.putString(PARAM_PLACE_ID, placeId); return new JobRequest.Builder(SendPlaceRequestJob.JOB_TAG) .setExecutionWindow(10_000L, 20_000L) .setRequiredNetworkType(NetworkType.CONNECTED) .setExtras(extras) .setRequirementsEnforced(true) .build(); }
- 77. if has network connection attempt to submit request
- 78. if has network connection attempt to submit request else queue request
- 79. ANDROID JOB - SCHEDULING jobManager.schedule( );
- 80. ANDROID JOB - SCHEDULING jobManager.schedule(SendPlaceRequestJob.buildJobRequest(id)); JOB REQUEST JOB QUEUE
- 82. WHAT’S NEXT? ‣SMS Fallback ‣Async Code Paths ‣Push Notifications