Scroll Essential Android 2.3 Manual de usuario descargar pdf (Pagina 31)

Android Wear Docs, Release 1.1

}

// Data layer and lifecycle implementation (Step 2)

...

}

2. Add callback methods for the data layer and lifecycle events. For simplicity, send a message in the onConnected

callback method.

// Connect to the data layer when the Activity starts

@Override

protected void onStart() {

super.onStart();

googleClient.connect();

}

// Send a message when the data layer connection is successful.

@Override

public void onConnected(Bundle connectionHint) {

String message = "Hello wearable\n Via the data layer";

//Requires a new thread to avoid blocking the UI

new SendToDataLayerThread("/message_path", message).start();

}

// Disconnect from the data layer when the Activity stops

@Override

protected void onStop() {

if (null != googleClient && googleClient.isConnected()) {

googleClient.disconnect();

}

super.onStop();

}

// Placeholders for required connection callbacks

@Override

public void onConnectionSuspended(int cause) { }

@Override

public void onConnectionFailed(ConnectionResult connectionResult) { }

3. Deﬁne a class that extends the Thread class and implements a method that sends your message to all nodes

currently connected to the data layer. This task can block the main UI thread, so it must run in a new thread.

class SendToDataLayerThread extends Thread {

String path;

String message;

// Constructor to send a message to the data layer

SendToDataLayerThread(String p, String msg) {

path = p;

message = msg;

}

public void run() {

NodeApi.GetConnectedNodesResult nodes = Wearable.NodeApi.getConnectedNodes(googleClient).await();

for (Node node : nodes.getNodes()) {

SendMessageResult result = Wearable.MessageApi.sendMessage(googleClient, node.getId(), path, message.getBytes()).await();

if (result.getStatus().isSuccess()) {

Log.v("myTag", "Message: {" + message + "} sent to: " + node.getDisplayName());

}

6.1. First Wearable Message 27

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