The document provides an overview of how to build Android Wear applications. It discusses setting up an Android Wear project in Android Studio, establishing a connection between the mobile and wear modules using GoogleApiClient, and sending and receiving data and messages between the two modules via the Data Layer API and MessageAPI. It also presents an example application structure with a foreground activity on the mobile module and a WearableListenerService on the wear module to handle data and event handling.

1. Kick-Start Your Experience
with Android Wear
+MarioViviani
Android GDE
@mariuxtheone

2. Mario Viviani
Founder & CEO Mariux Apps
Android GDE

3. Photo source info here

4. ANDROID
EVERYWHERE

5. ANDROID
EVERYWEAR

8. Project Setup

9. Use Android Studio!
Android Studio is optimized for Wear
http://goo.gl/ZSJH5O

10. Android Wear Project Wizard

11. Android Wear Project Wizard

12. GDE
WatchViewStub
<android.support.wearable.view.WatchViewStub
...
app:rectLayout="@layout/rect_activity_wear"
app:roundLayout="@layout/round_activity_wear"
...>
</android.support.wearable.view.WatchViewStub>
XML

13. protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wear);
final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
@Override
public void onLayoutInflated(WatchViewStub stub) {
mTextView = (TextView) stub.findViewById(R.id.text);
}
});
WearActivity.java

14. protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wear);
final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
@Override
public void onLayoutInflated(WatchViewStub stub) {
mTextView = (TextView) stub.findViewById(R.id.text);
}
});
WearActivity.java

15. GDE
Project Structure

16. GDE
Mobile
Module
Wear
Module
?

17. Establish Connection

18. GDE
Google Play Services
Setup Google Play Services
developer.android.com/google/play-services/setup.html

19. GDE
GoogleApiClient
mGoogleApiClient = new GoogleApiClient.Builder(context)
.addApi(Wearable.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();

20. GDE
Establish Connection
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
protected void onStop() {
super.onStop();
mGoogleApiClient.disconnect();
}
In Activity

21. GDE
Mobile
Module
Wear
Module
GoogleApi
Client
GoogleApi
Client

22. GDE
Mobile
Module
Wear
Module
GoogleApi
Client
GoogleApi
Client

23. Send & Receive Data

24. GDE
Message
DataItem

25. GDE
Data Layer Interfaces
static interface DataListener {
void onDataChanged(DataEventBuffer dataEvents);
}
static interface MessageListener {
void onMessageReceived(MessageEvent messageEvent);
}
static interface NodeListener {
void onPeerConnected(Node node);
void onPeerDisconnected(Node node);
}

26. GDE
Add Listeners in onConnected() (Activity Only)
@Override
public void onConnected(Bundle bundle) {
Wearable.DataApi.addListener(mGoogleApiClient, this);
Wearable.MessageApi.addListener(mGoogleApiClient, this);
Wearable.NodeApi.addListener(mGoogleApiClient, this);
}

27. GDE
DataItem / Message
Path
String “/path/to/item”
Payload
Byte[ ] <=100KB

28. GDE
Mobile
Module
Wear
Module
DataItem DataItem

29. GDE
Sync Data using DataMap
PutDataMapRequest dataMap = PutDataMapRequest.create("/path");
dataMap.getDataMap().putString("/itemID", "Hello, World");
PutDataRequest request = dataMap.asPutDataRequest();
PendingResult<DataApi.DataItemResult> pendingResult =
Wearable.DataApi.putDataItem(mGoogleApiClient, request);

30. GDE
Sync Assets (Images)
Asset asset = createAssetFromBitmap(bitmap);
PutDataMapRequest dataMap = PutDataMapRequest.
create("/image");
dataMap.getDataMap()
.putAsset("profileImage", asset)

31. GDE
React to Data Sync
@Override
public void onDataChanged(DataEventBuffer dataEvents) {
for (DataEvent event : dataEvents) {
if (event.getType() == DataEvent.TYPE_DELETED) {
...
} else if (event.getType() == DataEvent.TYPE_CHANGED) {
...
}
}
}

32. GDE
Retrieve the DataMap
@Override
public void onDataChanged(DataEventBuffer dataEvents) {
...
for (DataEvent event : events) {
if (event.getType() == DataEvent.TYPE_CHANGED) {
DataMapItem dataMapItem =
DataMapItem.fromDataItem(event.getDataItem());
DataMap dataMap = dataMapItem.getDataMap();
String s = dataMap.getString("/itemID");
}

33. GDE
Mobile
Module
Wear
Module
Message Message
Message Message

34. GDE
Send Message using MessageAPI
SendMessageResult result = Wearable.MessageApi.sendMessage(
mGoogleApiClient, node, "/path/startactivity", payload).await();
if (!result.getStatus().isSuccess()) {
Log.e(TAG, "ERROR: failed to send Message: " +
result.getStatus());
}

35. GDE
Get Connected Nodes
private Collection<String> getNodes() {
HashSet<String> results = new HashSet<String>();
NodeApi.GetConnectedNodesResult nodes =
Wearable.NodeApi.getConnectedNodes(mGoogleApiClient).await();
for (Node node : nodes.getNodes()) {
results.add(node.getId());
}
return results;
}

36. GDE
Receiving Message
@Override
public void onMessageReceived(MessageEvent messageEvent) {
if (messageEvent.getPath().equals(START_ACTIVITY_PATH)) {
Intent startIntent = new Intent(this, MainActivity.class);
startIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startIntent);
}
}

37. Handling Data Layer Events -
App Structure

38. GDE
Mobile
Module
Wear
Module

39. GDE
Wear
Module
Mobile
Module
Foreground
Activity
Foreground
Activity

40. GDE
Foreground
Activity onDataChanged()
onMessageReceived()
onPeerConnected()
onPeerDisconnected()
GoogleApi
Client

41. GDE
Wear
Module
Mobile
Module
Foreground
Activity
Foreground
Activity

42. GDE
Wear
Module
Mobile
Module
Foreground
Activity
Foreground
Activity
WearableListener
Service
WearableListener
Service

43. GDE
WearableListener
Service
onDataChanged()
onMessageReceived()
onPeerConnected()
onPeerDisconnected()
GoogleApi
Client

44. Example

45. GDE
Wear
Module
Mobile
Module
Foreground
Activity
Foreground
Activity
WearableListener
Service

46. MobileSendMessageActivity extends Activity {
...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.build();
}
MobileSendMessageActivity.java

47. ...
@Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
protected void onStop() {
super.onStop();
mGoogleApiClient.disconnect();
}
MobileSendMessageActivity.java

48. ...
private static final String START_ACTIVITY_PATH = "/start-activity";
public void sendMessageButtonClicked(View v){
Collection<String> nodes = getNodes();
for (String node : nodes) {
SendMessageResult result = Wearable.MessageApi.sendMessage(
mGoogleApiClient, node, START_ACTIVITY_PATH , null).await();
if (!result.getStatus().isSuccess()) {...}
}
}
}
MobileSendMessageActivity.java

49. public class StartWearActivityService extends WearableListenerService {
...
@Override
public void onCreate() {
super.onCreate();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.build();
mGoogleApiClient.connect();
}
...
StartWearActivityService.java

50. private static final String START_ACTIVITY_PATH = "/start-activity";
...
@Override
public void onMessageReceived(MessageEvent messageEvent) {
if (messageEvent.getPath().equals(START_ACTIVITY_PATH)) {
Intent startIntent = new Intent(this, WearActivity.class);
startIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startIntent);
}
}
}
StartWearActivityService.java

51. GDE
Add Service to Android Manifest
<service android:name=".StartWearActivityService">
<intent-filter>
<action
android:name="com.google.android.gms.wearable.BIND_LISTENER"/>
</intent-filter>
</service>

53. Simplicity is the
ultimate
sophistication.
Leonardo da Vinci
“
’’

54. Teleport
Data Sync and Messaging Library
for Android Wear
Github
github.com/Mariuxtheone/Teleport
Gradle - Maven
compile 'Teleport:teleportlib:0.1.3'

55. GDE
TeleportClient
TeleportClient mTeleportClient = new TeleportClient(this);
mTeleportClient.connect();
Set Up:
Send Message
mTeleportClient.sendMessage("startActivity", null);
Sync Data
mTeleportClient.syncInt("myInt", 12345)

56. GDE
TeleportService
setOnGetMessageTask(new TeleportService.OnGetMessageTask {
@Override
protected void onPostExecute(String path) {
if (path.equals("startActivity")){
Intent startIntent = new Intent(this, WearActivity.class);
startIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startIntent);
};}
Retrieve a Message

57. Photo source info here

58. +MarioViviani
Android GDE
mariux01@gmail.com
@mariuxtheone
Thanks! Q&A
Github
github.com/Mariuxtheone