Sending data from Activity to WearableListenerService

Question

When I read about the relationship between Activity and Service , I found that we can use either

• Ibinder
• Communicator
• Aidl

I'm interested in the first two. Therefore, when I tried to implement this for the relationship between Activity and WearableListenerService , I needed to override the onBind function.

But then I get a compiler error message

cannot override the final onBind method

I do not get such an error when I use the usual Service . So,

1. Does this mean that we cannot use the IBinder or Messenger approach to communicate with WearableListenerService with Activity ?

2. If so, what is the best way to pass the message to the WearableListenerService from the Activity (or call the public method of this service from the Activity)?

Answer 1

After some digging, I found a solution. Hope this helps someone else.

We can send a message from Activity to WearableListenerService using Wearable.MessageApi functions. If Activity and WearableListenerService are on the same Node (device), we need to get an instance of the local node (the current Node from which the message was sent) to send the message below

 NodeApi.GetLocalNodeResult nodes = Wearable.NodeApi.getLocalNode(mGoogleApiClient).await(); 

but not

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

which is used to get a list of other devices (for example, wear) connected to the phone.

So, I was able to successfully send a message from my Activity to WearableListenerService as follows

Action code

 public class PhoneActivity extends Activity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{ private static final String TAG = "PhoneActivity"; public static final String CONFIG_START = "config/start"; public static final String CONFIG_STOP= "config/stop" Intent intent; TextView txtview; GoogleApiClient mGoogleApiClient; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_phone); if(null == mGoogleApiClient) { mGoogleApiClient = new GoogleApiClient.Builder(this) .addApi(Wearable.API) .addConnectionCallbacks(this) .addOnConnectionFailedListener(this) .build(); Log.v(TAG, "GoogleApiClient created"); } if(!mGoogleApiClient.isConnected()){ mGoogleApiClient.connect(); Log.v(TAG, "Connecting to GoogleApiClient.."); } startService(new Intent(this, PhoneService.class)); } @Override public void onConnectionSuspended(int cause) { Log.v(TAG,"onConnectionSuspended called"); } @Override public void onConnectionFailed(ConnectionResult connectionResult) { Log.v(TAG,"onConnectionFailed called"); } @Override public void onConnected(Bundle connectionHint) { Log.v(TAG,"onConnected called"); } @Override protected void onStart() { super.onStart(); Log.v(TAG, "onStart called"); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.phone, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_start_) { new SendActivityPhoneMessage(CONFIG_START,"").start(); }else if (id == R.id.action__stop) { new SendActivityPhoneMessage(CONFIG_STOP,"").start(); }else if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } class SendActivityPhoneMessage extends Thread { String path; String message; // Constructor to send a message to the data layer SendActivityPhoneMessage(String p, String msg) { path = p; message = msg; } public void run() { NodeApi.GetLocalNodeResult nodes = Wearable.NodeApi.getLocalNode(mGoogleApiClient).await(); Node node = nodes.getNode(); Log.v(TAG, "Activity Node is : "+node.getId()+ " - " + node.getDisplayName()); MessageApi.SendMessageResult result = Wearable.MessageApi.sendMessage(mGoogleApiClient, node.getId(), path, message.getBytes()).await(); if (result.getStatus().isSuccess()) { Log.v(TAG, "Activity Message: {" + message + "} sent to: " + node.getDisplayName()); } else { // Log an error Log.v(TAG, "ERROR: failed to send Activity Message"); } } } } 

Service Code

 public class PhoneService extends WearableListenerService implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{ private static final String TAG = "PhoneService"; public static final String CONFIG_START = "config/start"; public static final String CONFIG_STOP = "config/stop"; GoogleApiClient mGoogleApiClient; public PhoneService() { } @Override public void onCreate() { super.onCreate(); Log.v(TAG, "Created"); if(null == mGoogleApiClient) { mGoogleApiClient = new GoogleApiClient.Builder(this) .addApi(Wearable.API) .addConnectionCallbacks(this) .addOnConnectionFailedListener(this) .build(); Log.v(TAG, "GoogleApiClient created"); } if(!mGoogleApiClient.isConnected()){ mGoogleApiClient.connect(); Log.v(TAG, "Connecting to GoogleApiClient.."); } } @Override public void onDestroy() { Log.v(TAG, "Destroyed"); if(null != mGoogleApiClient){ if(mGoogleApiClient.isConnected()){ mGoogleApiClient.disconnect(); Log.v(TAG, "GoogleApiClient disconnected"); } } super.onDestroy(); } @Override public void onConnectionSuspended(int cause) { Log.v(TAG,"onConnectionSuspended called"); } @Override public void onConnectionFailed(ConnectionResult connectionResult) { Log.v(TAG,"onConnectionFailed called"); } @Override public void onConnected(Bundle connectionHint) { Log.v(TAG,"onConnected called"); } @Override public void onDataChanged(DataEventBuffer dataEvents) { super.onDataChanged(dataEvents); Log.v(TAG, "Data Changed"); } @Override public void onMessageReceived(MessageEvent messageEvent) { super.onMessageReceived(messageEvent); if(messageEvent.getPath().equals(CONFIG_START)){ //do something here }else if(messageEvent.getPath().equals(CONFIG_STOP)){ //do something here } } @Override public void onPeerConnected(Node peer) { super.onPeerConnected(peer); Log.v(TAG, "Peer Connected " + peer.getDisplayName()); } @Override public void onPeerDisconnected(Node peer) { super.onPeerDisconnected(peer); Log.v(TAG, "Peer Disconnected " + peer.getDisplayName()); } }