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Developing Apps for Emerging Markets

The document discusses strategies for developing mobile applications suitable for off-grid markets, emphasizing offline capabilities and data management. It covers technologies like Realm for local data storage, EventBus for event management, and Android Job for scheduling background tasks. The document also outlines challenges and future ambitions, including the integration of tools like RxJava and push notifications.

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ONLINE-OFFLINE Developing Apps for Emerging Markets
OFF GRID ELECTRIC From: https://medium.com/@Offgrid
OFF GRID ELECTRIC
AGENDA ARCHITECTURE LIBRARIES CHALLENGES
ARCHITECTURE
BE USEFUL My App ‣Store data locally ‣Separate UI and network ‣Queue requests
MVP(Model View Presenter)
EVENT BUS DATABASE REPOSITORY REPOSITORY ACTIVITY FRAGMENT JOBS PRESENTER PRESENTER SERVICE
DISPLAY A VIEW PRESENTER SERVICE ACTIVITY EVENT BUS DATABASE REPOSITORY
TAKE AN ACTION PRESENTER SERVICE ACTIVITY EVENT BUS DATABASEREPOSITORY JOB NETWORK
APP SERVER
AGREE ON ‣Conflict Resolution ‣Adding Timestamps to Requests ‣Bundling Requests ‣Use of Status Fields
EVENT BUS DATABASE REPOSITORY REPOSITORY ACTIVITY FRAGMENT JOBS PRESENTER PRESENTER SERVICE
LIBRARIES
WHAT WE USE ‣Realm ‣EventBus ‣Android Job
STORE DATA LOCALLY
REALM ▸Easy to Set Up ▸Faster than ORMs ▸Has a Fluent API
REALM - MODEL CLASS @RealmClass
 public class Place implements RealmModel
 {
 }
REALM - MODEL CLASS @RealmClass
 public class Place implements RealmModel
 {
 @PrimaryKey
 private String localId; @Index
 private Long remoteId;
 private Gps location;
 … }
REALM - MODEL CLASS localId remoteId location 19444498-2a40… 1458260 65031f36-bde9… e85c9757-f546…
REALM - ADDING A RECORD public class PlaceRepository implements Repository<Place>
 {
 @Override
 public void add (final Place item)
 {
 
 } …
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.copyToRealmOrUpdate( item );
 } );
 realm.close();
 } …
REALM - QUERY RESULT private static final String PLACE_ID = "id"; @Override
 public Place toResult (Realm realm)
 {
 return realm.where( Place.class )
 
 }
REALM - QUERY RESULT private static final String PLACE_ID = "id"; @Override
 public Place toResult (Realm realm)
 {
 return realm.where( Place.class )
 .equalTo( PLACE_ID, placeId )
 .findFirst();
 }
SEPARATE UI AND NETWORK
EVENTBUS From: http://greenrobot.org/eventbus
… WHEN YOU HAVE LOTS OF OBJECTS THAT ARE POTENTIAL EVENT SOURCES. Martin Fowler EVENTBUS
EVENTBUS - SETUP @Provides
 @Singleton
 public Bus provideBus ()
 {
 return new Bus( EventBus.builder()
 .logNoSubscriberMessages( BuildConfig.DEBUG )
 .throwSubscriberException( false )
 .build() );
 }
EVENTBUS - REGISTER public class LeadsMapPresenter
 {
 private final Bus bus;
 private LeadsMapView leadsMapView;
 
 @Inject
 LeadsMapPresenter (Bus bus)
 {
 this.bus = bus;
 }
 
 …
EVENTBUS - REGISTER public class LeadsMapPresenter
 {
 public void attachView (LeadsMapView view)
 {
 this.leadsMapView = view;
 bus.register( this );
 }
EVENTBUS - REGISTER public class LeadsMapPresenter
 {
 public void attachView (LeadsMapView view)
 {
 this.leadsMapView = view;
 bus.register( this );
 } public void detachView ()
 {
 this.leadsMapView = null;
 bus.unregister( this );
 }
TAKE AN ACTION PRESENTER SERVICE ACTIVITY EVENT BUS DATABASEREPOSITORY JOB NETWORK
EVENTBUS - POST EVENT api.submitPlace( place ).enqueue( new Callback<Place>()
 {
 … JOB
EVENTBUS - POST EVENT api.submitPlace( place ).enqueue( new Callback<Place>()
 {
 @Override
 public void onResponse (Call<Place> call, Response<Place> response)
 {
 if ( response.isSuccessful() )
 {
 
 } … JOB
EVENTBUS - POST EVENT api.submitPlace( place ).enqueue( new Callback<Place>()
 {
 @Override
 public void onResponse (Call<Place> call, Response<Place> response)
 {
 if ( response.isSuccessful() )
 {
 Place updatedPlace = response.body();
 bus.post( new PlaceSubmissionSuccessEvent( updatedPlace ) );
 } … JOB
EVENTBUS - RETRIEVE EVENT public class LeadsMapPresenter
 { 
 @Subscribe
 public void onPlaceSubmissionSuccess (PlaceSubmissionSuccessEvent event)
 {
 leadsMapView.displaySuccessMessage( PLACE_SUCCESS ); } … PRESENTER
QUEUE REQUESTS
ANDROID JOB
ANDROID JOB ‣Alarm Manager ‣Job Scheduler ‣GCM Network Manager
ANDROID JOB JOB MANAGER JOB CREATOR
ANDROID JOB JOB MANAGER PROVIDER JOB JOB CREATOR PROVIDER JOB PROVIDER JOB
ANDROID JOB JOB MANAGER PROVIDER JOB JOB CREATOR PROVIDER JOB PROVIDER JOB JOB REQUEST
ANDROID JOB JOB MANAGER PROVIDER JOB JOB CREATOR PROVIDER JOB PROVIDER JOB JOB REQUEST JOB
ANDROID JOB - CREATOR @Singleton
 public class ConfettiJobCreator implements JobCreator
 {
 @Inject
 Map<String, Provider<Job>> jobs;
 
 @Override
 public Job create (String tag)
 {
 
 }
 }
ANDROID JOB - CREATOR @Singleton
 public class ConfettiJobCreator implements JobCreator
 {
 @Inject
 Map<String, Provider<Job>> jobs;
 
 @Override
 public Job create (String tag)
 {
 Provider<Job> jobProvider = jobs.get( tag );
 return jobProvider.get();
 }
 }
ANDROID JOB - JOB EXECUTION @Override
 protected Result onRunJob (final Params params)
 {
 
 } JOB
ANDROID JOB - JOB EXECUTION @Override
 protected Result onRunJob (final Params params)
 {
 PersistableBundleCompat extras = params.getExtras();
 String placeId = extras.getString( PARAM_PLACE_ID );
 
 
 } JOB
ANDROID JOB - JOB EXECUTION @Override
 protected Result onRunJob (final Params params)
 {
 PersistableBundleCompat extras = params.getExtras();
 String placeId = extras.getString( PARAM_PLACE_ID );
 
 if ( submitRequest( placeId ) )
 {
 return Result.SUCCESS;
 }
 return Result.FAILURE;
 } JOB
ANDROID JOB JOB MANAGER PROVIDER JOB JOB CREATOR JOB REQUEST JOB
ANDROID JOB - SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 
 }
ANDROID JOB - SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 return new JobRequest.Builder( SendPlaceRequestJob.JOB_TAG )
 
 }
ANDROID JOB - SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 return new JobRequest.Builder( SendPlaceRequestJob.JOB_TAG )
 .setExecutionWindow( 10_000L, 20_000L )
 .setRequiredNetworkType( JobRequest.NetworkType.CONNECTED )
 
 }
ANDROID JOB - SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 return new JobRequest.Builder( SendPlaceRequestJob.JOB_TAG )
 .setExecutionWindow( 10_000L, 20_000L )
 .setRequiredNetworkType( JobRequest.NetworkType.CONNECTED )
 .setExtras( extras )
 
 }
ANDROID JOB - SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 return new JobRequest.Builder( SendPlaceRequestJob.JOB_TAG )
 .setExecutionWindow( 10_000L, 20_000L )
 .setRequiredNetworkType( JobRequest.NetworkType.CONNECTED )
 .setExtras( extras )
 .setRequirementsEnforced( true )
 .build();
 }
ANDROID JOB - SCHEDULING jobManager.schedule( );
ANDROID JOB - SCHEDULING jobManager.schedule( SendPlaceRequestJob.buildJobRequest( id ) ); JOB REQUEST JOB QUEUE
WHAT WE USE ‣Realm ‣EventBus ‣Android Job
CHALLENGES
WHAT’S NEXT? ‣RxJava ‣Mapbox ‣Push Notifications
THANKS @brwngrldev +AnnyceDavis www.adavis.info

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Developing Apps for Emerging Markets

  • 1.
  • 2.
    OFF GRID ELECTRIC From:https://medium.com/@Offgrid
  • 3.
  • 4.
  • 5.
  • 6.
    BE USEFUL My App ‣Storedata locally ‣Separate UI and network ‣Queue requests
  • 7.
  • 8.
  • 9.
  • 10.
    TAKE AN ACTION PRESENTER SERVICE ACTIVITY EVENTBUS DATABASEREPOSITORY JOB NETWORK
  • 11.
  • 12.
    AGREE ON ‣Conflict Resolution ‣AddingTimestamps to Requests ‣Bundling Requests ‣Use of Status Fields
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
    REALM ▸Easy to SetUp ▸Faster than ORMs ▸Has a Fluent API
  • 18.
    REALM - MODELCLASS @RealmClass
 public class Place implements RealmModel
 {
 }
  • 19.
    REALM - MODELCLASS @RealmClass
 public class Place implements RealmModel
 {
 @PrimaryKey
 private String localId; @Index
 private Long remoteId;
 private Gps location;
 … }
  • 20.
    REALM - MODELCLASS localId remoteId location 19444498-2a40… 1458260 65031f36-bde9… e85c9757-f546…
  • 21.
    REALM - ADDINGA RECORD public class PlaceRepository implements Repository<Place>
 {
 @Override
 public void add (final Place item)
 {
 
 } …
  • 22.
    REALM - ADDINGA RECORD public class PlaceRepository implements Repository<Place>
 {
 @Override
 public void add (final Place item)
 {
 Realm realm = Realm.getDefaultInstance();
 realm.executeTransaction( (realm) -> {
 realm.copyToRealmOrUpdate( item );
 } );
 realm.close();
 } …
  • 23.
    REALM - QUERYRESULT private static final String PLACE_ID = "id"; @Override
 public Place toResult (Realm realm)
 {
 return realm.where( Place.class )
 
 }
  • 24.
    REALM - QUERYRESULT private static final String PLACE_ID = "id"; @Override
 public Place toResult (Realm realm)
 {
 return realm.where( Place.class )
 .equalTo( PLACE_ID, placeId )
 .findFirst();
 }
  • 26.
  • 27.
  • 28.
    … WHEN YOUHAVE LOTS OF OBJECTS THAT ARE POTENTIAL EVENT SOURCES. Martin Fowler EVENTBUS
  • 29.
    EVENTBUS - SETUP @Provides
 @Singleton
 publicBus provideBus ()
 {
 return new Bus( EventBus.builder()
 .logNoSubscriberMessages( BuildConfig.DEBUG )
 .throwSubscriberException( false )
 .build() );
 }
  • 30.
    EVENTBUS - REGISTER publicclass LeadsMapPresenter
 {
 private final Bus bus;
 private LeadsMapView leadsMapView;
 
 @Inject
 LeadsMapPresenter (Bus bus)
 {
 this.bus = bus;
 }
 
 …
  • 31.
    EVENTBUS - REGISTER publicclass LeadsMapPresenter
 {
 public void attachView (LeadsMapView view)
 {
 this.leadsMapView = view;
 bus.register( this );
 }
  • 32.
    EVENTBUS - REGISTER publicclass LeadsMapPresenter
 {
 public void attachView (LeadsMapView view)
 {
 this.leadsMapView = view;
 bus.register( this );
 } public void detachView ()
 {
 this.leadsMapView = null;
 bus.unregister( this );
 }
  • 33.
    TAKE AN ACTION PRESENTER SERVICE ACTIVITY EVENTBUS DATABASEREPOSITORY JOB NETWORK
  • 34.
    EVENTBUS - POSTEVENT api.submitPlace( place ).enqueue( new Callback<Place>()
 {
 … JOB
  • 35.
    EVENTBUS - POSTEVENT api.submitPlace( place ).enqueue( new Callback<Place>()
 {
 @Override
 public void onResponse (Call<Place> call, Response<Place> response)
 {
 if ( response.isSuccessful() )
 {
 
 } … JOB
  • 36.
    EVENTBUS - POSTEVENT api.submitPlace( place ).enqueue( new Callback<Place>()
 {
 @Override
 public void onResponse (Call<Place> call, Response<Place> response)
 {
 if ( response.isSuccessful() )
 {
 Place updatedPlace = response.body();
 bus.post( new PlaceSubmissionSuccessEvent( updatedPlace ) );
 } … JOB
  • 37.
    EVENTBUS - RETRIEVEEVENT public class LeadsMapPresenter
 { 
 @Subscribe
 public void onPlaceSubmissionSuccess (PlaceSubmissionSuccessEvent event)
 {
 leadsMapView.displaySuccessMessage( PLACE_SUCCESS ); } … PRESENTER
  • 39.
  • 40.
  • 41.
    ANDROID JOB ‣Alarm Manager ‣JobScheduler ‣GCM Network Manager
  • 42.
  • 43.
    ANDROID JOB JOB MANAGER PROVIDER JOB JOBCREATOR PROVIDER JOB PROVIDER JOB
  • 44.
    ANDROID JOB JOB MANAGER PROVIDER JOB JOBCREATOR PROVIDER JOB PROVIDER JOB JOB REQUEST
  • 45.
    ANDROID JOB JOB MANAGER PROVIDER JOB JOBCREATOR PROVIDER JOB PROVIDER JOB JOB REQUEST JOB
  • 46.
    ANDROID JOB -CREATOR @Singleton
 public class ConfettiJobCreator implements JobCreator
 {
 @Inject
 Map<String, Provider<Job>> jobs;
 
 @Override
 public Job create (String tag)
 {
 
 }
 }
  • 47.
    ANDROID JOB -CREATOR @Singleton
 public class ConfettiJobCreator implements JobCreator
 {
 @Inject
 Map<String, Provider<Job>> jobs;
 
 @Override
 public Job create (String tag)
 {
 Provider<Job> jobProvider = jobs.get( tag );
 return jobProvider.get();
 }
 }
  • 48.
    ANDROID JOB -JOB EXECUTION @Override
 protected Result onRunJob (final Params params)
 {
 
 } JOB
  • 49.
    ANDROID JOB -JOB EXECUTION @Override
 protected Result onRunJob (final Params params)
 {
 PersistableBundleCompat extras = params.getExtras();
 String placeId = extras.getString( PARAM_PLACE_ID );
 
 
 } JOB
  • 50.
    ANDROID JOB -JOB EXECUTION @Override
 protected Result onRunJob (final Params params)
 {
 PersistableBundleCompat extras = params.getExtras();
 String placeId = extras.getString( PARAM_PLACE_ID );
 
 if ( submitRequest( placeId ) )
 {
 return Result.SUCCESS;
 }
 return Result.FAILURE;
 } JOB
  • 51.
  • 52.
    ANDROID JOB -SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 
 }
  • 53.
    ANDROID JOB -SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 return new JobRequest.Builder( SendPlaceRequestJob.JOB_TAG )
 
 }
  • 54.
    ANDROID JOB -SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 return new JobRequest.Builder( SendPlaceRequestJob.JOB_TAG )
 .setExecutionWindow( 10_000L, 20_000L )
 .setRequiredNetworkType( JobRequest.NetworkType.CONNECTED )
 
 }
  • 55.
    ANDROID JOB -SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 return new JobRequest.Builder( SendPlaceRequestJob.JOB_TAG )
 .setExecutionWindow( 10_000L, 20_000L )
 .setRequiredNetworkType( JobRequest.NetworkType.CONNECTED )
 .setExtras( extras )
 
 }
  • 56.
    ANDROID JOB -SCHEDULING public static JobRequest buildJobRequest (String placeId)
 {
 PersistableBundleCompat extras = new PersistableBundleCompat();
 extras.putString( PARAM_PLACE_ID, placeId );
 
 return new JobRequest.Builder( SendPlaceRequestJob.JOB_TAG )
 .setExecutionWindow( 10_000L, 20_000L )
 .setRequiredNetworkType( JobRequest.NetworkType.CONNECTED )
 .setExtras( extras )
 .setRequirementsEnforced( true )
 .build();
 }
  • 57.
    ANDROID JOB -SCHEDULING jobManager.schedule( );
  • 58.
    ANDROID JOB -SCHEDULING jobManager.schedule( SendPlaceRequestJob.buildJobRequest( id ) ); JOB REQUEST JOB QUEUE
  • 59.
  • 60.
  • 65.
  • 66.