• Matthias Friedrich
• Android Developer @ Jimdo
• Java Developer
• Cofounder/-organizer
  GDG Bremen/GDG Hamburg Android
• @peacei
• google.com/+MatthiasFriedrich

• list of cards
• vertical navigation
• horizontal interaction

• Google Now
• Notifications (Your Apps!!!)
• Stacks, Pages, Actions

• activation by "OK Google"
  or tapping the watchface
• Voice Actions
• shows list of suggested Actions
• f.e. "Take a note"

• each Action triggers an Intent
• apps can react to Intents just as usual
  using IntentFilters

• Explicit Intents, f.e. "OK Google Start AppXY"
• Implicit Intents, f.e. "OK Google Take a Note"

• Android 4.4W
• SDK lvl 20

• android.webkit
• android.print
• android.app.backup
• android.appwidget
• android.hardware.usb

      PackageManager pm = context.getPackageManager();
      if (pm.hasSystemFeature(PackageManager.FEATURE_WIFI)) {
        ...
      }

• provides access to all the notifications
• Android 4.3
• Google Play Services 5.0 (Wearable Services)

• syncs wearable apps to the watch
• reads notifications and pushes them
  to the wearable device

• define default apps for intents
• do watch settings

• com.android.support:support-v4:20.+
  • provides APIs to adjust Notifications for Wearables

• com.google.android.gms:play-services:5.0.77
  • provides Wearable Service APIs to sync data between the Phone and the Wearable
  • seperately available as: com.google.android.gms:play-services-wearable:+

• com.google.android.support:wearable:+
  • provides Layouts and Views to use on Wearables, like...
    • CardFragment
    • CircledImageView
    • GridViewPager
    • WearableListView

// create notification using a builder
NotificationCompat.Builder notificationBuilder =
        new NotificationCompat.Builder(this)
        .setContentTitle("Title")
        .setContentText("Short message")
        .setContextnIntent(pendingIntent) ...;
    

// add a action to show on Phone and Wearable
notificationBuilder =
        .addAction(iconRes, "ActionTitle", pendingIntentAction1);
    

// show the notification
notificationManager.notify(notificationId, notificationBuilder.build());  
    

// create the Wearable action
NotificationCompat.Action wearableAction =
        new NotificationCompat.Action.Builder(iconRes,
                "WearableActionTitle", pendingIntentAction2))
                .build();
    

// add the Wearable Action to the notification
notificationBuilder.extend(wearableAction);
    

// show the notification just on the Phone
notificationBuilder.setLocalOnly(true);  
    

// Create second page notification
Notification secondPageNotification =
        new NotificationCompat.Builder(this)
        .setContentText("2nd Page Context")... .build();

// Wrap second page in WearableExtender and extend
// the main notification
Notification twoPagesNotification =
        new WearableExtender()
                .addPage(secondPageNotification)
                .extend(notificationBuilder)
                .build();

notificationManager.notify(notificationId, twoPagesNotification);
    

// Create intent for reply action
Intent replyIntent = new Intent(this, ReplyActivity.class);
PendingIntent replyPendingIntent =
        PendingIntent.getActivity(this, 0, replyIntent, 0);

// Key for the string that's delivered in the action's intent
private static final String EXTRA_VOICE_REPLY = "extra_voice_reply";

String replyLabel = getResources().getString(R.string.reply_label);
String[] replyChoices = getResources().
    getStringArray(R.array.reply_choices);

RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_VOICE_REPLY)
        .setLabel(replyLabel).setChoices(replyChoices)
        .build();
    

// Create the reply action and add the remote input
NotificationCompat.Action action =
        new NotificationCompat.Action.Builder(R.drawable.ic_reply_icon,
                getString(R.string.label, replyPendingIntent))
                .addRemoteInput(remoteInput)
                .build();

// Build the notification and add the action via WearableExtender
Notification notification =
        new NotificationCompat.Builder(mContext)
                ...
                .extend(new WearableExtender().addAction(action))
                .build();

    

• Data Items
  • Data storage with automatic synching between Phone and Wearable

• Messages
  • "Fire-&-Forget" commands
  • deliver Intents or MediaPlayer commands

• Assets
  • send binary blobs of data (f.e. images)
  • automatic caching to avoid repeating transfers over bluetooth