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Connect your Phone and Home with Firebase and Android Things
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James Coggan
December 28, 2017
Programming
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100
Connect your Phone and Home with Firebase and Android Things
Presentation done at Droidcon Tel Aviv 2017
James Coggan
December 28, 2017
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Transcript
James Coggan, MyDrive Solutions Connect your Phone and Home with
Firebase and Android Things We are hiring! https://www.mydrivesolutions.com/jobs Q&A sli.do #thingstelaviv
A little bit about me.. James Coggan Android tech lead
https://jamescoggan.com @mad_team
None
What is Android Things?
Android + Internet of Things Android Things
The hardware NXP Pico i.MX7D Raspberry Pi 3 NXP Argon
i.MX6UL NXP Pico i.MX6UL
Development kits NXP Pico i.MX7D Raspberry pi kit
Android
Android Things
What Android Things does support
What Android Things doesn’t support
Good to know • Main application started on boot •
Permissions are free and set on reboot • adb connect 192.168.1.111:5555
Why Android Things? • Kotlin :) • Maintained by Google
• OTA updates • Android community • Hardware agnostic • Relatively cheap hardware • Reusable code
Getting started https://partner.android.com/things/console/u/0/#/tools
Getting started
Getting started
Supported I/Os • General Purpose Input/Output (GPIO): Binary • Pulse
Width Modulation (PWM): Servo motors, DC motors • Inter-Integrated Circuit(I2C) • Serial Peripheral Interface (SPI) • Universal Asynchronous Receiver Transmitter (UART)
None
None
Raspberry Pi NXP MX7D
val pioService = PeripheralManagerService() try { val pinName = "BCM6"
ledGpio = pioService.openGpio(pinName) ledGpio?.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW) } catch (e: IOException) { e.printStackTrace() }
val pioService = PeripheralManagerService() try { val pinName = "BCM21"
button = ButtonInputDriver( pinName, Button.LogicState.PRESSED_WHEN_LOW, KeyEvent.KEYCODE_SPACE) button?.register() } catch (e: IOException) { e.printStackTrace() }
override fun onKeyDown(keyCode: Int, event: KeyEvent): Boolean { if (keyCode
== KeyEvent.KEYCODE_SPACE) { setLedValue(true) return true } return super.onKeyDown(keyCode, event) }
override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { if (keyCode
== KeyEvent.KEYCODE_SPACE) { setLedValue(false) return true } return super.onKeyUp(keyCode, event) }
val gpioForLED: String // Pin 31 get() { return when
(Build.DEVICE) { DEVICE_RPI3 -> "BCM6" DEVICE_IMX6UL_PICO -> "GPIO4_IO22" DEVICE_IMX7D_PICO -> "GPIO2_IO02" else -> throw IllegalStateException("Unknown Build.DEVICE " + Build.DEVICE) } }
val gpioForButton: String // Pin 40 get() { return when
(Build.DEVICE) { DEVICE_RPI3 -> "BCM21" DEVICE_IMX6UL_PICO -> "GPIO2_IO03" DEVICE_IMX7D_PICO -> "GPIO6_IO14" else -> throw IllegalStateException("Unknown Build.DEVICE " + Build.DEVICE) } }
val pinName = gpioForLED ledGpio = pioService.openGpio(pinName) ... val pinName
= gpioForButton button = ButtonInputDriver( pinName, Button.LogicState.PRESSED_WHEN_LOW, KeyEvent.KEYCODE_SPACE) ...
None
None
None
Setting up Firebase https://console.firebase.google.com • Create a new Firebase project
• Add a new Android app to the project with your package name: ie: com.jamescoggan.thingspresentation • Enable anonymous login on (temporarily)
• Setup a database // Database { "light" : true
} • Add the rules // Rules - don’t expose your data for the world { "rules": { ".write": "auth != null", ".read": "auth != null", } }
// Base build.gradle for all modules buildscript { ... dependencies
{ classpath "com.google.gms:google-services:$googleServicesClassVersion" } }
// mobile & things build.gradle dependencies { ... implementation "com.google.firebase:firebase-core:$playServicesVersion"
implementation "com.google.firebase:firebase-database:$playServicesVersion" implementation "com.google.firebase:firebase-auth:$playServicesVersion" implementation "android.arch.lifecycle:extensions:$androidArchComponentsVersion" } apply plugin: "com.google.gms.google-services"
// MainActivity.kt (Both modules - mobile and things) override fun
onCreate(savedInstanceState: Bundle?) { FirebaseApp.initializeApp(this) // Move me to the Application class val firebaseAuth = FirebaseAuth.getInstance() val databaseReference = FirebaseDatabase.getInstance().reference }
// MainActivity.kt override fun onCreate(savedInstanceState: Bundle?) { ... val databaseReference
= FirebaseDatabase.getInstance().reference firebaseAuth.signInAnonymously() .addOnCompleteListener { task -> if (task.isSuccessful) { observeLightsData() } else { Timber.e(task.exception, "FirebaseAuth:failed") } } }
// Light.kt class FirebaseTables { companion object { val LIGHTS_BASE
= "light" } } data class Light(val light : Boolean)
class LightLiveData(val firebase: DatabaseReference) : LiveData<Light>() { private val valueEventListener
= object : ValueEventListener { override fun onDataChange(snapshot: DataSnapshot) { val newValue = snapshot.getValue(Boolean::class.java) ?: false value = Light(newValue) } override fun onCancelled(error: DatabaseError) { } } override fun onActive() { firebase.child(LIGHTS_BASE).addValueEventListener(valueEventListener) } override fun onInactive() { firebase.child(LIGHTS_BASE).removeEventListener(valueEventListener) } }
// Things Activity private val lightsDataObserver = Observer<Light> { lightState
-> Timber.d("LightState changed: ${lightState?.isOn}") led.setValue(lightState?.isOn ?: false) } override fun onCreate(savedInstanceState: Bundle?) { ... firebaseAuth.signInAnonymously() .addOnCompleteListener { task -> if (task.isSuccessful) { lightsLiveData.observe(this, lightsDataObserver) } else { Timber.e(task.exception, "FirebaseAuth:failed")
// Mobile Activity override fun onCreate(savedInstanceState: Bundle?) { ... toggleButton.setOnCheckedChangeListener({
_, state: Boolean -> databaseReference.child("light").setValue(state) }) }
None
None
None
Nearby • Pub/Sub • Send messages, files or stream data
• No need for server • Peer to peer • Wifi or BLE
Nearby
googleApiClient = GoogleApiClient.Builder(this) .addApi(Nearby.CONNECTIONS_API) .addConnectionCallbacks(object : GoogleApiClient.ConnectionCallbacks { override fun
onConnected(connectionHint: Bundle?) { startService() } override fun onConnectionSuspended(cause: Int) { failed() } }) .build()
private fun startService() { // Android Things Nearby.Connections.startAdvertising( googleApiClient, "appName",
"serviceId", connectionLifecycleCallback, AdvertisingOptions(Strategy.P2P_STAR)) .setResultCallback { result -> when { result.status.isSuccess -> Timber.d("startAdvertising:onResult: SUCCESS") else -> Timber.w("STATE_READY")
private fun startService() { // Phone Nearby.Connections.startDiscovery( googleApiClient, "serviceId", endpointDiscoveryCallback,
DiscoveryOptions(Strategy.P2P_STAR)) .setResultCallback { result -> when { result.status.isSuccess -> Timber.d("startDiscovery:SUCCESS") else -> { Timber.w("startDiscovery:FAILURE ${result.statusMessage}")
private val connectionLifecycleCallback = object : ConnectionLifecycleCallback() { override fun
onConnectionResult(endpointId: String?, result: ConnectionResolution?) { Timber.d("connectionResult from " + endpointId, result) sendDataPayload() } }
// Phone private fun sendDataPayload(email : String, password: String) {
val credentials = Credentials(email, password) val adapter = moshi.adapter(Credentials::class.java) val json = adapter.toJson(credentials) Nearby.Connections.sendPayload( googleApiClient, currentEndpointId, Payload.fromBytes(json.toByteArray()) ) }
private val payloadCallback = object : PayloadCallback() { override fun
onPayloadReceived(endpointId: String?, payload: Payload?) { val adapter = moshi.adapter(Credentials::class.java) val credentials = adapter.fromJson(jsonString) credentials?.let { saveCredentials(credentials) } } }
firebaseAuth.signInWithEmailAndPassword(email,password) .addOnFailureListener { exception -> exception.printStackTrace() } .addOnSuccessListener { loadData()
} }
Success!!
https://github.com/jamescoggan/thingspresentationn • Common code in shared module • Nearby •
RainbowHat: ◦ Sensors ◦ Led ◦ Button • Philips Hue (in progress)
Q&A sli.do #thingstelaviv
Feedback: https://goo.gl/gwPxpY Thank you! https://jamescoggan.com @mad_team