BBM Call Out 101 By Call Out Jakarta Android Team 

We Have BBM Call Already Why We Need Call Out ? https://giphy.com/gifs/reaction-a5viI92PAF89q 

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Why Call Out is Made • Needs to contact family/relatives in areas with internet connectivity issue • Phone call is still main way of people to communicate • Demand for competitive rate of calls 

What is BBM Call Out • A service to provide BBM account a virtual phone number (VN) • A virtual phone number can be used for voice and SMS, both in and out • Business Cooperation with Smartfren as Telco Provider 

Requirement To Get VN • Accept ToC • KTP & KK - Indonesian Resident • VN ready to use • Voice/SMS In is free of charge • Voice/SMS Out is chargeable (DANA) 

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VN can Expire • VN will expire if not used to make chargeable call within 90 days • To prevent expiry, make outgoing call or receive incoming call from non Smartfren number • Once expired, we can not get same VN if re-register 

How Call Out Works 

Tech? Challenge • Platform Team: • Leverage MediaCallManager • Instead of user uri, use phone number as ID • Backend & Platform Team • Working with 3rd party require effective communication and patience 

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Tech? Challenge • Android Team: • Smartfren require user to give exact location when user access Call Out • Team does not want to reinvent the wheels • Leverage BBMLocationManager 

http://mathtourist.blogspot.com/2011/05/riding-on-square-wheels.html The Wheels is Unfit 

Tech? Challenge • BBMLocationManager • Low accuracy • Long interval cache • Using old Android’s Location API 

Tech? Challenge • Instead of using BBMLocationManager, we decide to use
 Android’s Fused Location Provider API 
 (part of Google Play Services) • Simple API and battery-efficient • Manages underlying location technologies 
 (GPS and Wi-Fi) • Best accuracy possible with no additional power consumption • Provide Last Known Location and Query Location Updates 

FusedLocationProviderClient // Play Location Services implementation "com.google.android.gms:play-services-location:16.0.0" implementation "com.android.support:support-v4:$support_version" app/build.gradle app/../AndroidManifest.xml 

FusedLocationProviderClient // Play Location Services implementation "com.google.android.gms:play-services-location:16.0.0" implementation "com.android.support:support-v4:$support_version" app/build.gradle app/../AndroidManifest.xml 

Implementation typealias LocationData = Pair interface FusedLocationWrapper { fun lastKnownLocation(): Single fun locationUpdates(): Observable } 

Last (Known) Location class FusedLocationWrapperImpl( private val client: FusedLocationProviderClient ) : FusedLocationWrapper { @SuppressLint("MissingPermission") @MainThread override fun lastKnownLocation(): Single = Single.create { emitter -> client.lastLocation .addOnSuccessListener { location -> location?.let { emitter.onSuccess(it.latitude to it.longitude) } } .addOnFailureListener { emitter.onError(it) } }.subscribeOn(AndroidSchedulers.mainThread()) 

Last (Known) Location • Last Location usually equivalent with user current location • Last Location may return null value when • Location (GPS) is turned off 
 (will clear last location cache if already retrieved) • Device never record location 
 (new device or factory resetted) • Google Play Services restarted on device 

Location Updates class FusedLocationWrapperImpl( private val client: FusedLocationProviderClient ) : FusedLocationWrapper { . . . override fun lastKnownLocation(): Single = . . . @SuppressLint("MissingPermission") @MainThread override fun locationUpdates(): Observable = Observable.create { emitter -> val request = LocationRequest().apply { interval = 1_000 fastestInterval = 500 priority = LocationRequest.PRIORITY_HIGH_ACCURACY } val callback = object : LocationCallback() { override fun onLocationResult(location: LocationResult?) { location?.lastLocation?.let { emitter.onNext(it.latitude to it.longitude) } } } client.requestLocationUpdates(request, callback, Looper.myLooper()) emitter.setCancellable { client.removeLocationUpdates(callback) } }.subscribeOn(AndroidSchedulers.mainThread()) 

Location Updates class FusedLocationWrapperImpl( private val client: FusedLocationProviderClient ) : FusedLocationWrapper { . . . override fun lastKnownLocation(): Single = . . . @SuppressLint("MissingPermission") @MainThread override fun locationUpdates(): Observable = Observable.create { emitter -> val request = LocationRequest().apply { interval = 1_000 fastestInterval = 500 priority = LocationRequest.PRIORITY_HIGH_ACCURACY } val callback = object : LocationCallback() { override fun onLocationResult(location: LocationResult?) { location?.lastLocation?.let { emitter.onNext(it.latitude to it.longitude) } } } client.requestLocationUpdates(request, callback, Looper.myLooper()) emitter.setCancellable { client.removeLocationUpdates(callback) } }.subscribeOn(AndroidSchedulers.mainThread()) 

Location Request Priority • PRIORITY_BALANCED_POWER_ACCURACY • City block accuracy of approx 100m, • Coarse & consume less power • Likely use Wi-Fi and cell tower positioning 

Location Request Priority (2) • PRIORITY_HIGH_ACCURACY • Most precise accuracy • Likely use GPS to determine location 

Location Request Priority (3) • PRIORITY_LOW_POWER • City block accuracy of approx 10km • Coarse & consume less power 

Location Request Priority (4) • PRIORITY_NO_POWER • Only receive updates other apps trigger location updates 

Location Updates class FusedLocationWrapperImpl( private val client: FusedLocationProviderClient ) : FusedLocationWrapper { . . . override fun lastKnownLocation(): Single = . . . @SuppressLint("MissingPermission") @MainThread override fun locationUpdates(): Observable = Observable.create { emitter -> val request = LocationRequest().apply { interval = 1_000 fastestInterval = 500 priority = LocationRequest.PRIORITY_HIGH_ACCURACY } val callback = object : LocationCallback() { override fun onLocationResult(location: LocationResult?) { location?.lastLocation?.let { emitter.onNext(it.latitude to it.longitude) } } } client.requestLocationUpdates(request, callback, Looper.myLooper()) emitter.setCancellable { client.removeLocationUpdates(callback) } }.subscribeOn(AndroidSchedulers.mainThread()) 

Location Updates class FusedLocationWrapperImpl( private val client: FusedLocationProviderClient ) : FusedLocationWrapper { . . . override fun lastKnownLocation(): Single = . . . @SuppressLint("MissingPermission") @MainThread override fun locationUpdates(): Observable = Observable.create { emitter -> val request = LocationRequest().apply { interval = 1_000 fastestInterval = 500 priority = LocationRequest.PRIORITY_HIGH_ACCURACY } val callback = object : LocationCallback() { override fun onLocationResult(location: LocationResult?) { location?.lastLocation?.let { emitter.onNext(it.latitude to it.longitude) } } } client.requestLocationUpdates(request, callback, Looper.myLooper()) emitter.setCancellable { client.removeLocationUpdates(callback) } }.subscribeOn(AndroidSchedulers.mainThread()) 

Location Updates class FusedLocationWrapperImpl( private val client: FusedLocationProviderClient ) : FusedLocationWrapper { . . . override fun lastKnownLocation(): Single = . . . @SuppressLint("MissingPermission") @MainThread override fun locationUpdates(): Observable = Observable.create { emitter -> val request = LocationRequest().apply { interval = 1_000 fastestInterval = 500 priority = LocationRequest.PRIORITY_HIGH_ACCURACY } val callback = object : LocationCallback() { override fun onLocationResult(location: LocationResult?) { location?.lastLocation?.let { emitter.onNext(it.latitude to it.longitude) } } } client.requestLocationUpdates(request, callback, Looper.myLooper()) emitter.setCancellable { client.removeLocationUpdates(callback) } }.subscribeOn(AndroidSchedulers.mainThread()) 

Location Updates class FusedLocationWrapperImpl( private val client: FusedLocationProviderClient ) : FusedLocationWrapper { . . . override fun lastKnownLocation(): Single = . . . @SuppressLint("MissingPermission") @MainThread override fun locationUpdates(): Observable = Observable.create { emitter -> val request = LocationRequest().apply { interval = 1_000 fastestInterval = 500 priority = LocationRequest.PRIORITY_HIGH_ACCURACY } val callback = object : LocationCallback() { override fun onLocationResult(location: LocationResult?) { location?.lastLocation?.let { emitter.onNext(it.latitude to it.longitude) } } } client.requestLocationUpdates(request, callback, Looper.myLooper()) emitter.setCancellable { client.removeLocationUpdates(callback) } }.subscribeOn(AndroidSchedulers.mainThread()) 

Location Updates class FusedLocationWrapperImpl( private val client: FusedLocationProviderClient ) : FusedLocationWrapper { . . . override fun lastKnownLocation(): Single = . . . @SuppressLint("MissingPermission") @MainThread override fun locationUpdates(): Observable = Observable.create { emitter -> val request = LocationRequest().apply { interval = 1_000 fastestInterval = 500 priority = LocationRequest.PRIORITY_HIGH_ACCURACY } val callback = object : LocationCallback() { override fun onLocationResult(location: LocationResult?) { location?.lastLocation?.let { emitter.onNext(it.latitude to it.longitude) } } } client.requestLocationUpdates(request, callback, Looper.myLooper()) emitter.setCancellable { client.removeLocationUpdates(callback) } }.subscribeOn(AndroidSchedulers.mainThread()) 

How to use interface LocationGateway { fun currentLocation(): Single } class LocationGatewayImpl( private val fusedLocation: FusedLocationWrapper ) : LocationGateway { override fun currentLocation(): Single = Single.merge( fusedLocation.lastKnownLocation(), fusedLocation.locationUpdates().firstOrError() ).firstOrError() } 

How to use interface LocationGateway { fun currentLocation(): Single } class LocationGatewayImpl( private val fusedLocation: FusedLocationWrapper ) : LocationGateway { override fun currentLocation(): Single = Single.merge( fusedLocation.lastKnownLocation(), fusedLocation.locationUpdates().firstOrError() ).firstOrError() } 

Terima Kasih Eko Suhariyadi — @ECHOES Istantyo Triono — @E3C8408B