Desenvolvimento para Chromecast orientado a Android, apresentação dada no Android LX 2014.

1. Desenvolver
para
Chromecast

2. O que é?

3. O que é?

4. O que é?

5. O que NÃO é?

6. Cenário típico
Image source: Google Developers webpage

7. Algumas
Particularidades
•mDNS
•OTA updates automáticos
•Android / ChromeOS
•Pairing com PIN / Ultrassons

8. Google Cast
É a tecnologia que
permite criar
experiências multi-ecrã
onde o utilizador envia
e controla o conteúdo.
Chromecast
É um dispositivo que implementa
esta tecnologia!

9. Existem 2 tipos
de aplicações
• Sender Applications
• Receiver Applications

10. Sender
Applications

11. Android Dev
Setup
• Habilitiar desenvolvimento no dispositivo
• No projecto:
– Incluir bibliotecas de desenvolvimento
– Algum boilerplate code
– Cast Button, Conectividade, ...

12. Chromecast Dev Mode

13. Bibliotecas necessárias
compile 'com.android.support:appcompat-v7:20.0.0'
compile 'com.android.support:mediarouter-v7:20.0.0'
compile 'com.google.android.gms:play-services:6.1.11'

14. AndroidManifest
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
android:theme="@style/Theme.AppCompat"

15. Sender App lifecycle
Inicializar API
Descobrir e conectar
Iniciar Receiver App
Receber e enviar msgs
Desconectar

16. Design Guidelines
Mais info em: http://goo.gl/NFoHXa

17. Google Cast Badge
http://goo.gl/NFoHXa

18. Google Cast Store

19. Sender APP code
The interesting
parts :)

20. Inicializar API
public class MainActivity extends ActionBarActivity
@Override onCreate()
// Configure Cast device discovery
mMediaRouter = MediaRouter.getInstance(getApplicationContext());
mMediaRouteSelector = new MediaRouteSelector.Builder()
.addControlCategory(
CastMediaControlIntent.categoryForCast(getResources()
.getString(R.string.app_id))).build();
mMediaRouterCallback = new MyMediaRouterCallback();
@Override onResume()
// Start media router discovery
mMediaRouter.addCallback(mMediaRouteSelector,
mMediaRouterCallback,
MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY);

21. Cast Button
<item
android:id="@+id/menu_item"
android:title="@string/title"
app:actionProviderClass="android.support.v7.app.
MediaRouteActionProvider"
app:showAsAction="always"/>

22. Cast Button - Activity
onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.main, menu);
MenuItem mediaRouteMenuItem =
menu.findItem(R.id.media_route_menu_item);
MediaRouteActionProvider mediaRouteActionProvider =
(MediaRouteActionProvider) MenuItemCompat
.getActionProvider(mediaRouteMenuItem);
// Set the MediaRouteActionProvider selector for device discovery.
mediaRouteActionProvider.setRouteSelector(mMediaRouteSelector);
return true;
}

23. Comunicação
class MessagesHub implements MessageReceivedCallback {
public String getNamespace() {
return getString(R.string.namespace);
}
....
GoogleApiClient mApiClient = new GoogleApiClient.Builder(this)
.addApi(Cast.API, apiOptionsBuilder.build())
.addConnectionCallbacks(mConnectionCallbacks)
.addOnConnectionFailedListener(mConnectionFailedListener)
.build();
mApiClient.connect();

24. Envio de mensagem
(Sender App)
Cast.CastApi.sendMessage(mApiClient,
mMessageHub.getNamespace(), message)
.setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(Status result) {
if (!result.isSuccess()) {
Log.e(TAG, "Sending message failed");
}
}
});

25. Recepção da mensagem
(Receiver App)
window.castReceiverManager =
cast.receiver.CastReceiverManager.getInstance();
window.messageBus =
window.castReceiverManager.getCastMessageBus(
'urn:x-cast:com.android.lx');
window.messageBus.onMessage = function(event) {
document.getElementById("message").innerHTML= event.data;
window.castReceiverManager.setApplicationState(text);
window.messageBus.send(event.senderId, event.data);
}

26. MAGIC!
Sources at: http://goo.gl/xuu9b8

27. Desligar
try {
Cast.CastApi.stopApplication(mApiClient, mSessionId);
if (mMessageHub != null) {
Cast.CastApi.removeMessageReceivedCallbacks(
mApiClient,
mMessageHub.getNamespace());
mMessageHub = null;
}
} catch (IOException e) {
Log.e(TAG, "Exception while removing channel", e);
}
mApiClient.disconnect();

28. Por: Pedro Veloso (http://goo.gl/5y4IZQ)
Slides disponíveis em : http://goo.gl/0xvjxr