Hands-on with Android Wear

A beginners guide to getting up and running with Android Wear.

Transcript

1. Hands-on with Breandan Considine JetBrains, Inc. AnDevCon Boston ‘15
57. Wearable Data Layer (Play Services) • Communication channel between handheld and wearables • Google Play Services behind the scenes • Provides three API for communication • Data Layer API • Node Layer API • Message Layer API
58. Android Wear Communication Mobile App Google Play Services Wear App Data Layer Node Layer Message
59. Wearable Data Layer API (Play Services) • All wearable communication starts with the GoogleApiClient apiClient = new GoogleApiClient.Builder(this) .addConnectionCallbacks(this) .addOnConnectionFailedListener(this) .addApi(Wearable.API) .build();
60. Wearable Data Layer API @Override protected void onStart() { super.onStart(); apiClient.connect(); } @Override protected void onStop() { apiClient.disconnect(); super.onStop(); }
61. @Override public void onConnected(Bundle bundle) { Wearable.DataApi.addListener(apiClient, this); Wearable.MessageApi.addListener(apiClient, this); Wearable.NodeApi.addListener(apiClient, this); } @Override protected void onPause() { super.onPause(); Wearable.DataApi.removeListener(apiClient, this); … } Listeners and Callbacks
62. // Sender Wearable.MessageApi.sendMessage(apiClient, transcriptionNodeId, PATH, byteArray); // Listener public void onMessageReceived(MessageEvent me) { if (me.getPath().equals(PATH)){ … } } Message API • One-way communication channel between local and remote node
63. PendingResult<NodeApi.GetConnectedNodesResult> nodes = Wearable.NodeApi.getConnectedNodes(mGoogleApiClient); @Override public void onPeerConnected(Node node) {…} @Override public void onPeerDisconnected(Node node) {…} Node API
64. PendingResult<CapabilityApi.GetCapabilityResult> capability = Wearable.CapabilityApi.getCapability( mGoogleApiClient, VOICE_TRANSCRIPTION_CAPABILITY_NAME, CapabilityApi.FILTER_REACHABLE); @Override public void onCapabilityChanged(CapabilityInfo info) {…} <?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="android_wear_capabilities"> <item>voice_transcription</item> </string-array> </resources> Capability API
65. Voice Actions • Like handheld, launching a wear app defaults to android:label <activity android:name=".WearActivity" android:label="WearActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> … </activity>
66. Special Thanks