DevFest NYC - Android Things Workshop - Build a Motion Sensing Camera using Android Things

In this session, Rebecca walked attendees through building their own Android Things powered motion sensing camera. The slides reveal the different steps required to get to the final result.

The code for this workshop can be found here - https://github.com/riggaroo/android-things-motion-camera

Transcript

1. DevFest NYC - Android
   Things Workshop
   Build a Motion Sensing Camera
   Rebecca Franks
   Android Engineering Lead at DVT
   @riggaroo
   

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2. Joshua Leibstein
   GDG Johannesburg Organiser
   @JoshLiebe
   Oscar Salguero
   @OscarSalguero
   

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3. Slides
   bit.ly/nyc-at-slides
   Workshop Feedback
   bit.ly/nyc-at-workshop
   

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5. What we will build:
   Intro:
   1. Create project and read physical button value
   2. Read motion values from Motion Sensor
   3. Turn LED on/off based on Motion Sensor
   4. Take photo and display when Motion is detected
   Further reading - advanced section:
   5. Upload information to Firebase (photo + log)
   6. Send Push Notification
   7. View list of photos
   

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6. Android Things Theory
   

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7. What is Android Things?
   Android Things is an extension of the Android platform for
   IoT and embedded devices.
   

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8. Interactive Ads
   Vending Machines
   Point of Sale
   Stock Control
   Retail
   Cameras
   Gateways
   Access Control
   Smart Meters
   Business
   Asset Tracking
   Fleet Management
   Driver Assist
   Predictive Service
   Logistics
   Security Systems
   Smart Doorbells
   Routers
   Energy Monitors
   Home
   Android Things is ideal for powerful, intelligent
   devices that need to be secure.
   

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9. Similarities
   Any other Android library...
   Android SDK Play Services Firebase
   Android Studio Cloud Platform
   

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10. Differences
    No Play Store Deploy OTAs
    Subset of
    APIs
    Custom
    Hardware
    Single Purpose
    Device
    

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11. Applications
    Launcher Phone Messaging Contacts Calendar Browser Settings
    Application Framework
    Activity
    Manager
    Window Manager Power
    Manager
    Resource
    Manager
    XMPP
    Service
    Content
    Providers
    Wallpapers System UI
    Package
    Manager
    Telephony
    Manager
    Location
    Manager
    Connectivity
    Manager
    View
    System
    Runtime
    Permissions
    Soft
    Keyboards Notifications
    Libraries
    Surface
    Manager
    Media
    Framework
    Chromium SSL HAL
    Audio
    Manager
    SQLite Open GL libc
    Core
    Libraries
    Android
    Runtime (ART)
    Android Runtime
    Linux Kernel
    Display Driver Camera Driver Bluetooth Driver
    Binder (IPC)
    Driver
    USB Driver Audio Driver WiFi Driver
    Power
    Management
    

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12. Applications
    Launcher Phone Messaging Contacts Calendar Browser Settings
    Application Framework
    Activity
    Manager
    Window Manager Power
    Manager
    Resource
    Manager
    XMPP
    Service
    Content
    Providers
    Wallpapers System UI
    Package
    Manager
    Telephony
    Manager
    Location
    Manager
    Connectivity
    Manager
    View
    System
    Runtime
    Permissions
    Soft
    Keyboards Notifications
    Libraries
    Surface
    Manager
    Media
    Framework
    Chromium SSL HAL
    Audio
    Manager
    SQLite Open GL libc
    Core
    Libraries
    Android
    Runtime (ART)
    Android Runtime
    Linux Kernel
    Display Driver Camera Driver Bluetooth Driver
    Binder (IPC)
    Driver
    USB Driver Audio Driver WiFi Driver
    Power
    Management
    

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13. Applications
    Launcher Phone Messaging Contacts Calendar Browser Settings
    Application Framework
    Activity
    Manager
    Window Manager Power
    Manager
    Resource
    Manager
    XMPP
    Service
    Wallpapers System UI
    Package
    Manager
    Telephony
    Manager
    Location
    Manager
    Connectivity
    Manager
    View
    System
    Soft
    Keyboards Notifications
    Libraries
    Surface
    Manager
    Media
    Framework
    Chromium SSL HAL
    Audio
    Manager
    SQLite Open GL libc
    Core
    Libraries
    Android
    Runtime (ART)
    Android Runtime
    Linux Kernel
    Display Driver Camera Driver Bluetooth Driver
    Binder (IPC)
    Driver
    USB Driver Audio Driver WiFi Driver
    Power
    Management
    Things Support Library
    Peripheral
    I/O
    Device
    Management
    User
    Drivers Connectivity
    

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14. SoM
    Architecture
    Google
    Managed BSP
    

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15. Distribution with Android Things
    Android Framework
    Hardware Libraries
    Linux Kernel
    Managed by Google
    Apps
    User Drivers
    Managed by Developers
    

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16. Android Things Console
    ● Manage your Android Things IoT Product
    ● Download and install the latest Android Things system
    image
    ● Build factory images that contain OEM applications along
    with the system image
    ● Push over-the-air (OTA) updates
    partner.android.com/things/console
    

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20. Developing for Android
    Things
    

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21. Developer Kits
    NXP I.MX7D Raspberry Pi 3
    

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22. Hardware Integration
    Peripheral Driver Library - Github
    + many more...
    bit.ly/androidthings-github
    Button GPS
    PWM Servo
    RGB LED Strip
    Temperature
    Sensor
    Capacitive
    Touch Buttons
    Peripheral I/O - Low Level Access
    GPIO PWM
    I2C SPI
    UART I2S
    

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23. Build a Motion Sensing
    Camera
    

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25. things
    mobile
    cloud-functions
    Project Structure
    Runs on Android Things Device
    Runs on any Android Phone (companion app)
    Deployed to Firebase Cloud Functions (javascript)
    

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26. Electronics Basics
    

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27. Components
    Breadboard - Construction base for
    prototyping electronics
    Jumper Wire - Used to interconnect the
    components of a breadboard
    

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28. LEDs - Emits visible light when an
    electric current passes through it
    Push Switches - Allows electricity
    to flow between its two contacts
    Components
    

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29. Resistor -Used to reduce current flow
    Source: http://www.electronicshub.org/resistor-color-code/
    Components
    and many more...
    

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30. Ohm’s Law
    The current through a conductor
    between two points is directly
    proportional to the voltage across the
    two points.
    V = I * R
    V is Voltage (volts)
    I is Current (amps)
    R is Resistance (ohms)
    I = 0.023A
    V = 5V
    R = 5V / 0.023A
    R = ± 217 ohms
    

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31. Hardware Setup
    

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32. Pico i.MX7 Pinout
    * there was a change in pin naming in DP6
    

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33. Red, Red, Brown = 220 ohm
    Brown, Black, Orange = 1k ohm
    

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36. Working with a Motion
    Sensor
    

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37. PIR Sensor
    

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38. Adjust Sensitivity (Range)
    

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39. Adjust Timeout
    

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40. GPIO
    - General Purpose Input / Output
    - Programmable way to read true / false values (1 or 0) (push
    button, PIR Sensor)
    - Write true/false values (LED)
    - Configurable
    

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41. Pico Setup: bit.ly/pico-pro-setup
    

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42. Red, Red, Brown = 220 ohm
    Brown, Black, Orange = 1k ohm
    

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43. Firmware Setup
    

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44. //Boot into fastboot mode - old method
    $ adb reboot bootloader
    // Get list of fastboot devices
    $ fastboot devices
    1b2f21d4e1fe0129 fastboot
    //Locate directory with factory image
    $ ./flash_all.sh //windows ./flash_all.bat
    // Get list of devices once flashed
    $ adb devices
    List of devices attached
    1b2f21d4e1fe0129 device
    

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45. //Start internet - Old Method
    $ adb shell am startservice -n com.google.wifisetup/.WifiSetupService -a
    WifiSetupService.Connect -e ssid "Jozihub Events" -e passphrase Jozihub#
    

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48. //Download Android Things Flashing Tool
    $ ./androidthings-quickstart //Mac and Linux - Windows double click .exe
    Onboarding tool for Android Things
    ==================================
    This tool will help you install Android Things on your board and set up Wifi.
    What do you want to do?
    1 - Install Android Things on a board and optionally set up Wifi
    2 - Set up Wifi on an existing Android Things device
    1
    What is your board?
    1 - Raspberry Pi 3
    2 - NXP Pico i.MX7D
    3 - NXP Pico i.MX6UL
    2
    You chose NXP Pico i.MX7D.
    

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49. Before downloading Android Things, please consult our terms of service at
    https://developer.android.com/things/terms/index.html
    If you agree to our terms of service, press y to download it. Otherwise press n. (y/n) y
    Downloading Android Things image for NXP Pico i.MX7D...
    Downloaded image.
    Connect the board to your host computer with a USB-C cable.
    Once connected, press [Enter] key to install Android Things onto the board...
    Looking for devices...
    An Android device has been detected. Do you want to flash it? (y/n)
    WARNING: this will remove any existing data from it!
    y
    Installing fastboot...
    Waiting for fastboot to launch... This can take up to 3 minutes.
    Found fastboot device.
    Unzipping image...
    Installing Android Things on your board. This will take a few minutes...
    *Do not disconnect or interrupt!*
    ...
    Successfully flashed your imx7d.
    Successfully installed Android Things...
    

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50. Would you like to set up Wi-Fi on your board? (y/n) y
    Please ensure antenna is already attached. If it is not, disconnect your board,
    attach the antenna and reconnect your board to your computer.
    When ready, press [Enter]...
    Enter the Wi-Fi network name: somenetwork
    Enter the Wi-Fi network password (leave empty if no password): somepassword
    Connecting to Wi-Fi network somenetwork...
    Looking for device... This can take up to 3 minutes.
    Device found.
    Waiting...
    Successfully connected to Wifi
    

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51. Project Setup
    

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52. Install Android Studio 3.0
    

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56. //Automatically added in app level build.gradle
    compileOnly 'com.google.android.things:androidthings:...'
    

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57. //Automatically added in AndroidManifest.xml
    
    
    
    
    
    
    android:name="android.intent.category.IOT_LAUNCHER"/>
    
    
    
    
    

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58. //Automatically added in AndroidManifest.xml
    
    
    
    
    
    
    android:name="android.intent.category.IOT_LAUNCHER"/>
    
    
    
    
    

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59. Physical Button
    

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60. //Accessing Sensor Data
    private lateinit var buttonGpio: Gpio = PeripheralManagerService().openGpio("GPIO6_IO15")
    fun start() {
    buttonGpio.setDirection(Gpio.DIRECTION_IN)
    buttonGpio.setActiveType(Gpio.ACTIVE_HIGH)
    buttonGpio.setEdgeTriggerType(Gpio.EDGE_BOTH)
    buttonGpio.registerGpioCallback(object : GpioCallback() {
    override fun onGpioEdge(gpio: Gpio): Boolean {
    if (gpio.value) {
    ledGpio.value = true
    } else {
    //do something else
    }
    return true
    }
    })
    }
    

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61. //Accessing Sensor Data
    private lateinit var buttonGpio: Gpio = PeripheralManagerService().openGpio("GPIO6_IO15")
    fun start() {
    buttonGpio.setDirection(Gpio.DIRECTION_IN)
    buttonGpio.setActiveType(Gpio.ACTIVE_HIGH)
    buttonGpio.setEdgeTriggerType(Gpio.EDGE_BOTH)
    buttonGpio.registerGpioCallback(object : GpioCallback() {
    override fun onGpioEdge(gpio: Gpio): Boolean {
    if (gpio.value) {
    ledGpio.value = true
    } else {
    //do something else
    }
    return true
    }
    })
    }
    

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62. //Accessing Sensor Data
    private lateinit var buttonGpio: Gpio = PeripheralManagerService().openGpio("GPIO6_IO15")
    fun start() {
    buttonGpio.setDirection(Gpio.DIRECTION_IN)
    buttonGpio.setActiveType(Gpio.ACTIVE_HIGH)
    buttonGpio.setEdgeTriggerType(Gpio.EDGE_BOTH)
    buttonGpio.registerGpioCallback(object : GpioCallback() {
    override fun onGpioEdge(gpio: Gpio): Boolean {
    if (gpio.value) {
    ledGpio.value = true
    } else {
    //do something else
    }
    return true
    }
    })
    }
    

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63. Control LED
    

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64. val peripheralManagerService = PeripheralManagerService()
    ledGpio = peripheralManagerService.openGpio("GPIO6_IO14")
    ledGpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW)
    ledGpio.value = true
    ledGpio.close()
    

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65. val peripheralManagerService = PeripheralManagerService()
    ledGpio = peripheralManagerService.openGpio("GPIO6_IO14")
    ledGpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW)
    ledGpio.value = true
    ledGpio.close()
    

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66. val peripheralManagerService = PeripheralManagerService()
    ledGpio = peripheralManagerService.openGpio("GPIO6_IO14")
    ledGpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW)
    ledGpio.value = true
    ledGpio.close()
    

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67. Motion Sensor Code
    

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68. //Accessing Sensor Data
    private val motionSensorGpio: Gpio = PeripheralManagerService().openGpio("GPIO2_IO03")
    fun start() {
    motionSensorGpio.setDirection(Gpio.DIRECTION_IN)
    motionSensorGpio.setActiveType(Gpio.ACTIVE_HIGH)
    motionSensorGpio.setEdgeTriggerType(Gpio.EDGE_BOTH)
    motionSensorGpio.registerGpioCallback(object : GpioCallback() {
    override fun onGpioEdge(gpio: Gpio): Boolean {
    if (gpio.value) {
    motionListener.onMotionDetected()
    } else {
    motionListener.onMotionStopped()
    }
    return true
    }
    })
    }
    

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69. //Accessing Sensor Data
    private val motionSensorGpio: Gpio = PeripheralManagerService().openGpio("GPIO2_IO03")
    fun start() {
    motionSensorGpio.setDirection(Gpio.DIRECTION_IN)
    motionSensorGpio.setActiveType(Gpio.ACTIVE_HIGH)
    motionSensorGpio.setEdgeTriggerType(Gpio.EDGE_BOTH)
    motionSensorGpio.registerGpioCallback(object : GpioCallback() {
    override fun onGpioEdge(gpio: Gpio): Boolean {
    if (gpio.value) {
    motionListener.onMotionDetected()
    } else {
    motionListener.onMotionStopped()
    }
    return true
    }
    })
    }
    

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70. //Accessing Sensor Data
    private val motionSensorGpio: Gpio = PeripheralManagerService().openGpio("GPIO2_IO03")
    fun start() {
    motionSensorGpio.setDirection(Gpio.DIRECTION_IN)
    motionSensorGpio.setActiveType(Gpio.ACTIVE_HIGH)
    motionSensorGpio.setEdgeTriggerType(Gpio.EDGE_BOTH)
    motionSensorGpio.registerGpioCallback(object : GpioCallback() {
    override fun onGpioEdge(gpio: Gpio): Boolean {
    if (gpio.value) {
    camera.takePhoto()
    } else {
    //do something else
    }
    return true
    }
    })
    }
    

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71. Take a Photo
    

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72. CustomCamera
    bit.ly/custom-camera-android
    

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73. private fun setupCamera() {
    camera = CustomCamera.getInstance()
    camera.initializeCamera(this, Handler(), imageAvailableListener)
    }
    private val imageAvailableListener = object : CustomCamera.ImageCapturedListener {
    override fun onImageCaptured(bitmap: Bitmap) {
    motionImageView.setImageBitmap(bitmap)
    }
    }
    camera.takePicture()
    

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74. private fun setupCamera() {
    camera = CustomCamera.getInstance()
    camera.initializeCamera(this, Handler(), imageAvailableListener)
    }
    private val imageAvailableListener = object : CustomCamera.ImageCapturedListener {
    override fun onImageCaptured(bitmap: Bitmap) {
    motionImageView.setImageBitmap(bitmap)
    }
    }
    camera.takePicture()
    

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75. private fun setupCamera() {
    camera = CustomCamera.getInstance()
    camera.initializeCamera(this, Handler(), imageAvailableListener)
    }
    private val imageAvailableListener = object : CustomCamera.ImageCapturedListener {
    override fun onImageCaptured(bitmap: Bitmap) {
    motionImageView.setImageBitmap(bitmap)
    }
    }
    camera.takePicture()
    

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76. Congrats! You’ve built
    a motion sensing
    camera!
    

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77. Advance your app with
    Firebase + Cloud
    Functions
    

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78. Firebase - Saving Data
    Things app
    

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79. //data class for saving
    data class FirebaseImageLog(val timestamp: Long? = null, val imageRef: String? = null)
    //upload image
    val storageRef = FirebaseStorage.getInstance().getReference(FIREBASE_MOTION_REF)
    val imageStorageRef = storageRef.child(FIREBASE_IMAGE_PREFIX + System.currentTimeMillis() + ".jpg")
    val uploadTask = imageStorageRef.putBytes(imageStream.toByteArray())
    uploadTask.addOnFailureListener {
    Log.d(TAG, "onFailure uploadMotionImage")
    }.addOnSuccessListener {
    // save image log to realtime db
    val downloadUrl = imageStorageRef.path
    val ref = FirebaseDatabase.getInstance().getReference(FIREBASE_MOTION_LOGS).push()
    ref.setValue(FirebaseImageLog(System.currentTimeMillis(), downloadUrl))
    }
    

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80. //data class for saving
    data class FirebaseImageLog(val timestamp: Long? = null, val imageRef: String? = null)
    //upload image
    val storageRef = FirebaseStorage.getInstance().getReference(FIREBASE_MOTION_REF)
    val imageStorageRef = storageRef.child(FIREBASE_IMAGE_PREFIX + System.currentTimeMillis() + ".jpg")
    val uploadTask = imageStorageRef.putBytes(imageStream.toByteArray())
    uploadTask.addOnFailureListener {
    Log.d(TAG, "onFailure uploadMotionImage")
    }.addOnSuccessListener {
    // save image log to realtime db
    val downloadUrl = imageStorageRef.path
    val ref = FirebaseDatabase.getInstance().getReference(FIREBASE_MOTION_LOGS).push()
    ref.setValue(FirebaseImageLog(System.currentTimeMillis(), downloadUrl))
    }
    

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81. //data class for saving
    data class FirebaseImageLog(val timestamp: Long? = null, val imageRef: String? = null)
    //upload image
    val storageRef = FirebaseStorage.getInstance().getReference(FIREBASE_MOTION_REF)
    val imageStorageRef = storageRef.child(FIREBASE_IMAGE_PREFIX + System.currentTimeMillis() + ".jpg")
    val uploadTask = imageStorageRef.putBytes(imageStream.toByteArray())
    uploadTask.addOnFailureListener {
    Log.d(TAG, "onFailure uploadMotionImage")
    }.addOnSuccessListener {
    // save image log to realtime db
    val downloadUrl = imageStorageRef.path
    val ref = FirebaseDatabase.getInstance().getReference(FIREBASE_MOTION_LOGS).push()
    ref.setValue(FirebaseImageLog(System.currentTimeMillis(), downloadUrl))
    }
    

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82. //data class for saving
    data class FirebaseImageLog(val timestamp: Long? = null, val imageRef: String? = null)
    //upload image
    val storageRef = FirebaseStorage.getInstance().getReference(FIREBASE_MOTION_REF)
    val imageStorageRef = storageRef.child(FIREBASE_IMAGE_PREFIX + System.currentTimeMillis() + ".jpg")
    val uploadTask = imageStorageRef.putBytes(imageStream.toByteArray())
    uploadTask.addOnFailureListener {
    Log.d(TAG, "onFailure uploadMotionImage")
    }.addOnSuccessListener {
    // save image log to realtime db
    val downloadUrl = imageStorageRef.path
    val ref = FirebaseDatabase.getInstance().getReference(FIREBASE_MOTION_LOGS).push()
    ref.setValue(FirebaseImageLog(System.currentTimeMillis(), downloadUrl))
    }
    

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84. Firebase - Cloud
    Functions
    Javascript
    

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85. $ firebase login
    $ firebase init functions
    

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86. var functions = require('firebase-functions');
    var admin = require('firebase-admin');
    admin.initializeApp(functions.config().firebase);
    exports.annotateImage = functions.database.ref('/motion-logs/{id}')
    .onCreate(event => {
    const original = event.data.val();
    var topic = "/topics/intruders";
    var payload = {
    data: {
    title: "Intruder Alert!",
    body: "An intruder has been detected"
    }
    };
    return admin.messaging().sendToTopic(topic, payload)
    .then(function (response) {
    console.log("Successfully sent message:", response);
    }).catch(function (error) {
    console.log("Error sending message:", error);
    });
    }
    );
    

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87. var functions = require('firebase-functions');
    var admin = require('firebase-admin');
    admin.initializeApp(functions.config().firebase);
    exports.annotateImage = functions.database.ref('/motion-logs/{id}')
    .onCreate(event => {
    const original = event.data.val();
    var topic = "/topics/intruders";
    var payload = {
    data: {
    title: "Intruder Alert!",
    body: "An intruder has been detected"
    }
    };
    return admin.messaging().sendToTopic(topic, payload)
    .then(function (response) {
    console.log("Successfully sent message:", response);
    }).catch(function (error) {
    console.log("Error sending message:", error);
    });
    }
    );
    

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88. var functions = require('firebase-functions');
    var admin = require('firebase-admin');
    admin.initializeApp(functions.config().firebase);
    exports.annotateImage = functions.database.ref('/motion-logs/{id}')
    .onCreate(event => {
    const original = event.data.val();
    var topic = "/topics/intruders";
    var payload = {
    data: {
    title: "Intruder Alert!",
    body: "An intruder has been detected"
    }
    };
    return admin.messaging().sendToTopic(topic, payload)
    .then(function (response) {
    console.log("Successfully sent message:", response);
    }).catch(function (error) {
    console.log("Error sending message:", error);
    });
    }
    );
    

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89. $ firebase deploy --only functions
    

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91. Firebase - Retrieving
    Data
    Companion Mobile App
    

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92. //Use FirebaseUI dependency
    api "com.firebaseui:firebase-ui-database:3.0.0"
    // Get DB Reference
    val databaseRef = FirebaseDatabase.getInstance().getReference(MOTION_LOGS_FIREBASE_REF)
    // Create adapter that extends FirebaseRecyclerAdapter
    class LogsAdapter(ref: DatabaseReference) : FirebaseRecyclerAdapterLogsViewHolder>(FirebaseImageLog::class.java,
    R.layout.list_item_log, LogsViewHolder::class.java, ref) {
    //.. Do adapter things
    }
    // Set adapter to use reference
    adapter = LogsAdapter(databaseRef.orderByChild(ORDER_BY_TIMESTAMP).ref)
    

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93. //Use FirebaseUI dependency
    api "com.firebaseui:firebase-ui-database:3.0.0"
    // Get DB Reference
    val databaseRef = FirebaseDatabase.getInstance().getReference(MOTION_LOGS_FIREBASE_REF)
    // Create adapter that extends FirebaseRecyclerAdapter
    class LogsAdapter(ref: DatabaseReference) : FirebaseRecyclerAdapterLogsViewHolder>(FirebaseImageLog::class.java,
    R.layout.list_item_log, LogsViewHolder::class.java, ref) {
    //.. Do adapter things
    }
    // Set adapter to use reference
    adapter = LogsAdapter(databaseRef.orderByChild(ORDER_BY_TIMESTAMP).ref)
    

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94. //Use FirebaseUI dependency
    api "com.firebaseui:firebase-ui-database:3.0.0"
    // Get DB Reference
    val databaseRef = FirebaseDatabase.getInstance().getReference(MOTION_LOGS_FIREBASE_REF)
    // Create adapter that extends FirebaseRecyclerAdapter
    class LogsAdapter(ref: DatabaseReference) : FirebaseRecyclerAdapterLogsViewHolder>(FirebaseImageLog::class.java,
    R.layout.list_item_log, LogsViewHolder::class.java, ref) {
    //.. Do adapter things
    }
    // Set adapter to use reference
    adapter = LogsAdapter(databaseRef.orderByChild(ORDER_BY_TIMESTAMP).ref)
    

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95. //Use FirebaseUI dependency
    api "com.firebaseui:firebase-ui-database:3.0.0"
    // Get DB Reference
    val databaseRef = FirebaseDatabase.getInstance().getReference(MOTION_LOGS_FIREBASE_REF)
    // Create adapter that extends FirebaseRecyclerAdapter
    class LogsAdapter(ref: DatabaseReference) : FirebaseRecyclerAdapterLogsViewHolder>(FirebaseImageLog::class.java,
    R.layout.list_item_log, LogsViewHolder::class.java, ref) {
    //.. Do adapter things
    }
    // Set adapter to use reference
    adapter = LogsAdapter(databaseRef.orderByChild(ORDER_BY_TIMESTAMP).ref)
    

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97. Upload your projects to
    

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98. Full Example
    bit.ly/at-motion-camera
    Workshop Feedback
    bit.ly/nyc-at-workshop
    

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99. Thank you!
    Rebecca Franks
    Android Engineering Lead at DVT
    @riggaroo
    

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100. Clear all Android Apps on device:
     https://gist.github.com/blundell/7c0c3bb17898b28fe8122b0dc230af50
     Button Example : https://github.com/androidthings/sample-button
     Full MainActivity:
     https://gist.github.com/riggaroo/b4cad83be2f81d54fd854403af029b2d
     Github Project with Steps as branches:
     https://github.com/riggaroo/android-things-workshop-camera
     Links
     

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