Android Wear 2.0 provides the next level of freedom for wearables. Key features include direct access to the Play Store on watches, allowing installation of watch-only apps without a companion phone app. Notifications and complications have also been updated with new designs and functionality. Developers can now build watch faces with complications and data provider services to expose data to complications. Input methods on watches now include voice, emoji, handwriting, and keyboards on larger watches. Material Design guidelines provide recommendations for one-dimensional layouts and navigation on wearables.

1. Android Wear 2.0
Next Level of Freedom for Your Action
Constantine Mars
Organizer @ GDG Dnipro
Senior Developer @ DataArt

2. A long time ago…

3. A long time ago…
in the Lviv, not so far away :)

4. A long time ago…
in the Lviv, not so far away :)
We’ve been talking about...

5. #gdgceesummit
Freedom of tethering
BLE
WiFi
Cellular

6. #gdgceesummit
And chances to get direct access to Play Store

7. And today...

9. Developer Preview 3
Play Store and More
Available since September 28

10. #gdgceesummit
Play Store features
● multiple accounts,
● support of alpha and
beta testing
● update or uninstall
apps in “My apps” view
● install only the watch
app
● phone apps are no
longer necessary

11. You can now build and publish
watch-only apps for users to
discover on Google Play

12. #gdgceesummit
android {
publishNonDefault true // Allows you to reference product flavors in your phone's build.gradle
defaultConfig
{ minSdkVersion 23 } // This is the minSdkVersion of the Wear 1.0 embedded app
productFlavors {
wear1 { /* Use the defaultConfig value */ }
wear2 { minSdkVersion 24 }
}
}
Flavors for supporting both 2.0 and 1.x

13. #gdgceesummit
dependencies {
...
wearApp project(path: ':wear', configuration: 'wear1Release')
}
Package only when build variant requires it

14. #gdgceesummit
If no need in 1.x - simply publish MultiAPK

15. Hardware
Key platform features and supported watches

16. #gdgceesummit
Officially supported watches
LG Watch Urbane 2nd Edition Huawei Watch

17. #gdgceesummit
Officially supported watches
LG Watch Urbane 2nd Edition Huawei Watch
Display: 1.4 inches, 400 x 400 pixels (~286 ppi)
CPU:Quad-core 1.2 GHz Cortex-A7
GPU: Adreno 305, Chipset: Qualcomm Snapdragon 400
Memory: 4 GB, 512 MB RAM
Comm: Wi-Fi 802.11 b/g, Bluetooth v4.1 LE
Network: No cellular connectivity
Battery: 300 mAh (48h)
Display: 1.38 inches, 480 x 480 pixels (~348 ppi)
CPU: Quad-core 1.2 GHz Cortex-A7
GPU: Adreno 305, Chipset: Qualcomm Snapdragon 400
Memory: 4 GB, 768 MB RAM
Comm: Wi-Fi 802.11 b/g, Bluetooth v4.1 LE, GPS, NFC
Network: GSM, HSPA, LTE
Battery: 570 mAh (60h)

18. Complications
Personal expression and utility

19. #gdgceesummit
Personal expression and utility
Modern by LG Ranger by Zuhanden GoogleFit Today

20. #gdgceesummit
Or simply an personal expression :)
HeyKittyKitty by WatchMaster

21. #gdgceesummit
Complications
“any feature in a timepiece beyond the simple display
of hours and minutes” (Wikipedia)

22. #gdgceesummit
Complication types
-Short text
-Long text
-Range of values
-Icon (small picture)
-Image (big picture)

23. Complications coding

24. #gdgceesummit
New in Preview 3
com.google.android.wearable.permission.RECEIVE_COMPLICATION_DATA
Request permission to access Complication Data

25. #gdgceesummit
Runtime permissions. Wearable version:)
Now required for
accessing Complication
Providers from
WatchFace apps

26. #gdgceesummit
Each position need to be identified
private static final int LEFT_DIAL_COMPLICATION = 0;
private static final int RIGHT_DIAL_COMPLICATION = 1;
public static final int[] COMPLICATION_IDS = {LEFT_DIAL_COMPLICATION,
RIGHT_DIAL_COMPLICATION};
Complication ID

27. #gdgceesummit
Each position must be mapped with array of supported types
// Left and right dial supported types.
public static final int[][] COMPLICATION_SUPPORTED_TYPES = {
{ComplicationData.TYPE_SHORT_TEXT},
{ComplicationData.TYPE_SHORT_TEXT}
};
Complication supported types

28. #gdgceesummit
Data Providers and system trigger .onComplicationDataUpdate() sometimes
/* Called when there is updated data for a complication id. */
@Override
public void onComplicationDataUpdate(
int complicationId, ComplicationData complicationData) {
Log.d(TAG, "onComplicationDataUpdate() id: " + complicationId);
mActiveComplicationDataSparseArray.put(complicationId, complicationData);
invalidate();
}
ComplicationData receiving

29. #gdgceesummit
.onDraw() is the moment of drawing. ComplicationData where stored earlier
@Override
public void onDraw(Canvas canvas, Rect bounds) {
ComplicationData complicationData;
for (int i = 0; i < COMPLICATION_IDS.length; i++) {
complicationData = mActiveComplicationDataSparseArray
.get(COMPLICATION_IDS[i]);
// ...
Complications rendering

30. #gdgceesummit
Complication may be deactivated or contain wrong data type
if ((complicationData != null)
&& (complicationData.isActive(currentTimeMillis))
&& (complicationData.getType() ==
ComplicationData.TYPE_SHORT_TEXT)) {
ComplicationText mainText = complicationData.getShortText();
CharSequence complicationMessage =
mainText.getText(getApplicationContext(),
currentTimeMillis);
Complications rendering

31. #gdgceesummit
Actual drawing is trivial
canvas.drawText(
complicationMessage,
0,
complicationMessage.length(),
complicationsX,
mComplicationsY,
mComplicationPaint);
Complications rendering

32. Data Providers

33. #gdgceesummit
Android Wear role in data exchange

34. #gdgceesummit
Data Providers

35. Data Providers coding

36. #gdgceesummit
<service android:name=".RandomNumberProviderService"
android:label="@string/complications_provider_random_number"
android:icon="@drawable/ic_watch_white">
Data Provider Service attributes
Extend ComplicationProviderService

37. #gdgceesummit
<intent-filter>
<action
android:name="android.support.wearable.complications.ACTION_COMPLICATION_UPDA
TE_REQUEST"/>
</intent-filter>
<meta-data
android:name="android.support.wearable.complications.SUPPORTED_TYPES"
android:value="RANGED_VALUE,SHORT_TEXT,LONG_TEXT"/>
Data Provider declaration

38. #gdgceesummit
Update period
<meta-data
android:name="android.support.wearable.complications.UPDATE_PERIOD_SECONDS"
android:value="120"/>
Data Provider declaration

39. #gdgceesummit
@Override
public void onComplicationActivated( int complicationId, int dataType,
ComplicationManager complicationManager) { … }
@Override
public void onComplicationUpdate( int complicationId, int dataType,
ComplicationManager complicationManager) { … }
@Override
public void onComplicationDeactivated(int complicationId) { … }
Data Provider methods

40. #gdgceesummit
@Override
public void onComplicationUpdate(int complicationId, int dataType,
ComplicationManager complicationManager) {
// Retrieve or generate your data
int randomNumber = (int) Math.floor(Math.random() * 10);
String randomNumberText =
String.format(Locale.getDefault(), "%d!", randomNumber);
Exposing data to complications
Called according to update period time

41. #gdgceesummit
ComplicationData complicationData = null;
switch (dataType) {
case ComplicationData.TYPE_SHORT_TEXT:
complicationData = new ComplicationData.Builder(
ComplicationData.TYPE_SHORT_TEXT)
.setShortText(ComplicationText.plainText(randomNumberText))
.build();
break;
Exposing data to complications

42. #gdgceesummit
@Override
public void onComplicationUpdate( int complicationId, int dataType,
ComplicationManager complicationManager) {
…
if (complicationData != null) {
complicationManager.updateComplicationData(
complicationId,
complicationData);
}
Exposing data to complications

43. #gdgceesummit
WatchFaceService.Engine.setDefaultComplicationProvider()
Default Providers

44. Notifications updated

45. #gdgceesummit
Notifications in Android Wear 1.X

46. #gdgceesummit
Android Wear 2.0 Notifications
Material Design for Wearables, Dark Theme

47. #gdgceesummit
Notifications preview

48. #gdgceesummit
Notifications messaging style

49. Notifications coding

50. #gdgceesummit
Notification noti = new NotificationCompat.Builder()
.setContentTitle(messages.length + " new messages with " + sender)
.setContentText("subject")
.setSmallIcon(R.drawable.new_message)
// 2) set the style to MessagingStyle
.setStyle(new NotificationCompat.MessagingStyle(
getResources().getString(R.string.reply_name))
.addMessage(messages[0])
.addMessage(messages[1]);
Notifications with modern MessagingStyle
set MessagingStyle

51. #gdgceesummit
NotificationCompat.Action action =
new NotificationCompat.Action.Builder(R.drawable.ic_reply_icon,
getString(R.string.label), replyPendingIntent)
.addRemoteInput(remoteInput)
.setAllowGeneratedReplies(true)
.build();
Notifications with SmartReply
Allow SmartReply
Starting with Preview 3 SmartReply uses standalone machine, located on watch

52. #gdgceesummit
NotificationCompat.Action action =
new NotificationCompat.Action.Builder(R.drawable.ic_reply_icon,
getString(R.string.label), replyPendingIntent)
.addRemoteInput(remoteInput)
.extend(new NotificationCompat.Action.WearableExtender()
.setHintDisplayActionInline(true))
.build();
Inline Action, available directly from stream
Set inline action

53. (Not new) Input Methods

54. #gdgceesummit
New input methods

55. #gdgceesummit
Voice input, Emoji

56. #gdgceesummit
Keyboard, Handwriting

57. #gdgceesummit
Wait, a Keyboard???
LG Watch Urbane 2nd Edition
Display: 1.38 inches, 480 x 480 pixels (~348 ppi)
CPU: Quad-core 1.2 GHz Cortex-A7
GPU: Adreno 305, Chipset: Qualcomm Snapdragon 400
Memory: 4 GB, 768 MB RAM
Comm: Wi-Fi 802.11 b/g, Bluetooth v4.1, LE, GPS, NFC
Network: GSM, HSPA, LTE
Battery: 570 mAh (60h)
Size x2 bigger than first phones

58. Material Design for Wearables

59. #gdgceesummit
1D Layout
Do Don’t

60. #gdgceesummit
UI Anatomy

61. #gdgceesummit
Navigation Drawer

62. #gdgceesummit
Action Drawer

63. #gdgceesummit
Dark Theme

64. #gdgceesummit
Brightness values
1 App color - Default color
2 Dark background - 15%
3 Lighter background - 30%
4 UI element - 40%
5 Lighter UI element - 65%
6 Accent - 100%

65. #gdgceesummit
Applications list

66. #gdgceesummit
WearableRecyclerView
Since Preview 3 - .setCircularScrollingGestureEnabled(true) available

67. Some new Google Fit features
for Android Wear

68. #gdgceesummit
Upcoming APIs
Beat to Beat API Goals API Profile API

69. #gdgceesummit
Real Time Gym Activity Recognition

70. #gdgceesummit
Recognized exercises

71. Q&A?
Thank you!
Constantine Mars
@ConstantineMars
+ConstantineMars