This document provides an introduction to Android Wear and how to build wearable apps. It explains that Android Wear extends the Android platform to wearable devices and how they communicate with connected phones over Bluetooth. It then covers the basics of notifications, messages, and data syncing between mobile and wear devices. It includes code examples for sending notifications, listening for messages and data changes, and launching a mobile app from a wearable.

1. +GabrieleMariotti
@GabMarioPower
Introduction to Android Wear

3. What is Android Wear ?
Android Wear extends the Android platform to a new generation of
wearable devices

4. How does it work ?

5. How does it work ?
● Phone and wearable communicate with each other over BT
● Require Android 4.3+ on phone/tablet
● Wearable itself doesn’t connect to internet
● Limited function when connection is lost
● Current available sensors are Compass, Accelerometer, Gyroscope,
Heart Rate Sensor(*)

6. BATTERY LIFE:
24-36 Hrs

7. Custom OS Android Wear
Watches and Android Wear watches

8. Right information at just the right time

9. Right information at just the right time
Launched automatically

10. Right information at just the right time
Glanceable

11. Right information at just the right time
Suggest and demand

12. Right information at just the right time
Zero or low interaction

13. Apps on wear

14. Apps on wear

15. Apps on wear

16. Hands on…..

17. Android Wear Project Wizard
Use Android Studio!
http://goo.gl/ZSJH5O
Android Studio is optimized for Wear

18. Android Wear Project Wizard

19. Android Wear Project Wizard

20. Project structure

21. Wear Model : Notification
Mobile
Module
Wear
Module
?

22. Notification: simple example

23. Notification: basic example
NO WORK
REQUIRED

24. JAVA
Notification : basic example (1)
// Notification
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(“Notification Title”)
.setContentText(“Notification Text”)
.setContentIntent(mPendingIntent);

25. JAVA
Notification : basic example (2)
// Get an instance of the NotificationManager service
NotificationManagerCompat notificationManager =
NotificationManagerCompat.from(mContext);
// Build the notification and issues it with notification manager.
notificationManager.notify(notificationId, notificationBuilder.build());

26. Notification: long text

27. Notification: long text
NO WORK
REQUIRED

28. JAVA
Notification : long text
//BigText
NotificationCompat.BigTextStyle bigStyle = new
NotificationCompat.BigTextStyle();
bigStyle.setBigContentTitle(“Big Title”);
bigStyle.bigText(“Lorem ipsum……..”);
// Notification
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_launcher).setStyle(bigStyle)
.setContentIntent(mPendingIntent);

29. Notification: big picture

30. Notification: big picture
NO WORK
REQUIRED
NO WORK
REQUIRED

31. JAVA
Notification : big picture
//BigPicture
NotificationCompat.BigPictureStyle bigStyle = new NotificationCompat.BigPictureStyle();
bigStyle.bigPicture
(BitmapFactory.decodeResource(mContext.getResources(),R.drawable.large_image));
bigStyle.setBigContentTitle(“Big Title”);
bigStyle.setSummaryText(“Notification Text”);
// Notification
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_launcher).setStyle(bigStyle)
.setContentIntent(mPendingIntent);

32. Notification: pages

33. JAVANotificationCompat.BigPictureStyle bigStyle = new NotificationCompat.BigPictureStyle();
bigStyle.bigPicture
(BitmapFactory.decodeResource(mContext.getResources(), R.drawable.large_image));
bigStyle.setBigContentTitle(“Second Page”);
// Create second page notification
Notification secondPageNotification =
new NotificationCompat.Builder(mContext)
.setStyle(bigStyle)
.build();
Notification: pages

34. JAVA// Notification
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(“Notification Title”)
.setContentText(“Notification Text”)
.extend(
new NotificationCompat.WearableExtender().addPage(secondPageNotification))
.setContentIntent(mPendingIntent);
Notification: pages

35. Notification: stacks

36. JAVA// Notification
NotificationCompat.Builder notificationBuilder1 =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(“Notification Title”)
.setContentText("Alex New meeting")
.setGroup(GROUP_KEY_EMAILS)
.setContentIntent(mPendingIntent)
.setSortKey("0");
notificationManager.notify(notificationId, notificationBuilder1.build());
Notification: stacks (1)

37. JAVANotificationCompat.Builder notificationBuilder2 =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(“Notification Title”)
.setContentText("Peter Next week")
.setGroup(GROUP_KEY_EMAILS)
.setContentIntent(mPendingIntent)
.setSortKey("1");
notificationManager.notify(notification2Id, notificationBuilder2.build());
Notification: stacks (2)

38. JAVA
// Create an InboxStyle notification
Notification summaryNotificationWithBackground =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_launcher).setLargeIcon(largeIcon)
.setStyle(new NotificationCompat.InboxStyle()
.addLine("Alex New meeting")
.addLine("Peter Next week")
.setBigContentTitle("2 new messages")
.setSummaryText("johndoe@gmail.com"))
.setGroup(GROUP_KEY_EMAILS).setGroupSummary(true).build();
notificationManager.notify(notification3Id, summaryNotificationWithBackground);
Notification: stacks (3)

39. Notification: actions

40. Notification: actions
NO WORK
REQUIRED

41. JAVA// Notification
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(“Notification Title”)
.setContentText(“Notification Text”)
.addAction(R.drawable.ic_full_action, “Simple Action”,mPendingActionIntent)
.setContentIntent(mPendingIntent);
Notification: simple action

42. Notification: reply action

43. JAVANotificationCompat.Action action = new NotificationCompat.Action.Builder(
R.drawable.ic_full_reply,“Reply”,mPendingIntent)
.addRemoteInput(mNotificationUtil.getReplyAction())
.build();
public RemoteInput getReplyAction(){
RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_VOICE_REPLY)
.setLabel(“Reply”).build();
return remoteInput;
}
Notification: reply action (1)

44. JAVA// Notification
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(“Notification Title”)
.setContentText(“Notification Text”)
.extend(new NotificationCompat.WearableExtender().addAction(action));
Notification: reply action (2)

45. Notification: reply action with choices

46. JAVApublic RemoteInput getReplyActionWithPredefinedTextResponses(){
RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_VOICE_REPLY)
.setLabel(“Reply”)
.setChoices(mContext.getResources().getStringArray(R.array.reply_choices))
.build();
return remoteInput;
}
<string-array name="reply_choices">
<item>Yes</item>
<item>No</item>
</string-array>
Notification: reply action with choices

47. Wear Model : Connection
Mobile
Module
Wear
Module
GoogleApi
Client
GoogleApi
Client

48. JAVA
GoogleApiClient
Connection
//Connect the GoogleApiClient
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();

49. JAVA
GoogleApiClient
Connection
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Overrire
protected void onStop(){
super.onStop();
mGoogleApiClient.disconnect();
}

50. JAVA
Connected Nodes
Connection
private void resolveNode() {
Wearable.NodeApi.getConnectedNodes(mGoogleApiClient)
.setResultCallback(new ResultCallback<NodeApi.GetConnectedNodesResult>() {
@Override
public void onResult(NodeApi.GetConnectedNodesResult nodes) {
for (Node node : nodes.getNodes()) {
//…..
}
}
});
}

51. JAVA
Node - Listeners
Connection
public interface NodeApi.NodeListener {
void onPeerConnected(com.google.android.gms.wearable.Node node);
void onPeerDisconnected(com.google.android.gms.wearable.Node node);
}
Example:
public class MyActivity extends Activity implements NodeApi.NodeListener {
public void onConnected(Bundle bundle) {
Wearable.NodeApi.addListener(mGoogleApiClient, this);
}
}

52. Wear Model : Message
Message Message
Message Message

53. JAVA
Wearable.MessageApi.sendMessage(
mGoogleApiClient, nodeId, PATH, payload).setResultCallback(
new ResultCallback<MessageApi.SendMessageResult>() {
@Override
public void onResult(MessageApi.SendMessageResult sendMessageResult) {
//……….
}
}
);
Message
MessageAPI

54. JAVA
Message - Listener
Message
interface MessageApi.MessageListener {
void onMessageReceived(com.google.android.gms.wearable.MessageEvent messageEvent);
}
Example:
public class MyActivity extends Activity implements MessageApi.MessageListener {
public void onConnected(Bundle bundle) {
Wearable.MessageApi.addListener(mGoogleApiClient, this);
}
}

55. Wear Model : Data
Data Data

56. JAVAPutDataMapRequest dataMap = PutDataMapRequest.create("/count");
dataMap.getDataMap().putInt(COUNT_KEY, count++);
//dataMap.getDataMap().putString(“/myItemId”, “Hello World”);
PutDataRequest request = dataMap.asPutDataRequest();
PendingResult<DataApi.DataItemResult> pendingResult =
Wearable.DataApi.putDataItem(mGoogleApiClient, request);
Data
DataAPI

57. JAVA
Data - Listener
Data
interface DataApi.DataListener {
void onDataChanged(com.google.android.gms.wearable.DataEventBuffer dataEventBuffer);
}
Example:
public class MyActivity extends Activity implements DataApi.DataListener {
public void onConnected(Bundle bundle) {
Wearable.DataApi.addListener(mGoogleApiClient, this);
}
}

58. Wear Model : Message/Data
Activity Activity
WearableListenerSer
vice
WearableListenerSer
vice

59. JAVA
Activity
Receiving Message
public classs MyActivity extends Activity implements MessageApi.MessageListener {
//Add the listener in onConnected() method
@Override
public void onMessageReceived(MessageEvent messageEvent) {
if (messageEvent.getPath().equals(PATH)) {
byte[] bytes = messageEvent.getData();
}
}
}

60. JAVA
Service
Receiving Message
<service android:name=".MyListenerService">
<intent-filter>
<action android:name="com.google.android.gms.wearable.BIND_LISTENER" />
</intent-filter>
</service>
public classs MyListenerService extends WearableListenerService {
@Override
public void onMessageReceived(MessageEvent messageEvent) {
//…………..
}

61. JAVA
Activity
Receiving Data
public classs MyActivity extends Activity implements DataApi.DataListener {
//Add the listener in onConnected() method
@Override
public void onDataChanged(DataEventBuffer dataEvents) {
for (DataEvent event : dataEvents) {
if (event.getType() == DataEvent.TYPE_DELETED) {
Log.d(TAG, "DataItem deleted: " + event.getDataItem().getUri());
} else if (event.getType() == DataEvent.TYPE_CHANGED) {
Log.d(TAG, "DataItem changed: " + event.getDataItem().getUri());
}
}
}

62. JAVA
Service
Receiving Data
<service android:name=".MyListenerService">
<intent-filter>
<action android:name="com.google.android.gms.wearable.BIND_LISTENER" />
</intent-filter>
</service>
public classs MyListenerService extends WearableListenerService {
@Override
public void onDataChanged(DataEventBuffer dataEvents) {
//…………..
}

63. JAVA
Example: launch Activity on mobile from wear
SendMessageActivity extends Activity {
…
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.build();
}
wear/SendMessageActivity.java

64. JAVA
Example: launch Activity on mobile from wear
…
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
protected void onStop() {
super.onStop();
mGoogleApiClient.disconnect();
}
wear/SendMessageActivity.java

65. JAVA
Example: launch Activity on mobile from wear
private void resolveNode() {
Wearable.NodeApi.getConnectedNodes(mGoogleApiClient)
.setResultCallback(new ResultCallback<NodeApi.GetConnectedNodesResult>() {
@Override
public void onResult(NodeApi.GetConnectedNodesResult nodes) {
for (Node node : nodes.getNodes()) {
sendMessage(node);
}
}
});
}
wear/SendMessageActivity.java

66. JAVA
Example: launch Activity on mobile from wear
static final String HELLO_WORLD_WEAR_PATH = "/hello-world-wear";
private void sendMessage(Node node){
Wearable.MessageApi.sendMessage(
mGoogleApiClient, node.getId(), HELLO_WORLD_WEAR_PATH,null)
.setResultCallback(new ResultCallback<MessageApi.SendMessageResult>() {
@Override
public void onResult(MessageApi.SendMessageResult sendMessageResult) {
if (!sendMessageResult.getStatus().isSuccess()) {
Log.e("TAG", "Failed to send message with status code: "
+ sendMessageResult.getStatus().getStatusCode());
}
}
}
);
}
wear/SendMessageActivity.java

67. JAVA
Example: launch Activity on mobile from wear
public class ListenerServiceFromWear extends WearableListenerService {
private static final String WEAR_PATH = "/hello-world-wear";
@Override
public void onMessageReceived(MessageEvent messageEvent) {
if (messageEvent.getPath().equals(WEAR_PATH)) {
Intent startIntent = new Intent(this, EmptyActivity.class);
startIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startIntent);
}
}
}
mobile/ListenerService.java

68. JAVA
Example: launch Activity on mobile from wear
You can find the full code here:
https://gist.github.com/gabrielemariotti/117b05aad4db251f7534

69. References and Credits
- Getting Started with Android Wear
http://developer.android.com/wear
- Build apps for Wearables
http://developer.android.com/training/building-wearables.html
- Thanks to Mario Viviani for some slides and ideas from
Kick-Start Your Experience with Android Wear

70. +GabrieleMariotti
@GabMarioPower
Thank you!