I've been battling with the Android Wear Message API all day today and have finally accepted I need some help with this.
My app is very straightforward. The Mobile portion consists of a MainActivity (which does nothing but display "Hello world" and a Service which extends WearableListenerService. The Wear portion is just a MainActivity with a single Button, and implements MessageApi.MessageListener.
The idea is simple: press the Button on the Wear device which sends a message to the Mobile. When the Mobile receives the message, it displays a Toast with the sender's message path (e.g. /mobile). Immediately after doing this, the Mobile should send a message back to the Wear device using my reply() method. All I want to do then is Log this message.
I can achieve the first part perfectly fine. When the Button is pressed, the Mobile pops up a Toast saying "/mobile". The reply, however, seems to just get lost in the aether; no errors, but no message either.
Can someone please help me understand what I'm doing wrong? I have pasted my files below.
This is the tutorial I am following. Cheers!
Wear: MainActivity.java
package org.thecosmicfrog.toastdroidmessageapitutorial;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.wearable.view.WatchViewStub;
import android.util.Log;
import android.view.View;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.wearable.MessageApi;
import com.google.android.gms.wearable.MessageEvent;
import com.google.android.gms.wearable.Node;
import com.google.android.gms.wearable.NodeApi;
import com.google.android.gms.wearable.Wearable;
import java.util.List;
import java.util.concurrent.TimeUnit;
public class MainActivity extends Activity implements MessageApi.MessageListener {
private final String LOG_TAG = MainActivity.class.getSimpleName();
private static final long CONNECTION_TIME_OUT_MS = 100;
private static final String MOBILE_PATH = "/mobile";
private GoogleApiClient googleApiClient;
private String nodeId;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initGoogleApiClient();
final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
@Override
public void onLayoutInflated(WatchViewStub stub) {
initWidgets();
}
});
}
private void initGoogleApiClient() {
googleApiClient = getGoogleApiClient(this);
retrieveDeviceNode();
}
private GoogleApiClient getGoogleApiClient(Context context) {
return new GoogleApiClient.Builder(context)
.addApi(Wearable.API)
.build();
}
private void retrieveDeviceNode() {
new Thread(new Runnable() {
@Override
public void run() {
if (googleApiClient != null && !(googleApiClient.isConnected() || googleApiClient.isConnecting()))
googleApiClient.blockingConnect(CONNECTION_TIME_OUT_MS, TimeUnit.MILLISECONDS);
NodeApi.GetConnectedNodesResult result =
Wearable.NodeApi.getConnectedNodes(googleApiClient).await();
List<Node> nodes = result.getNodes();
if (nodes.size() > 0)
nodeId = nodes.get(0).getId();
Log.v(LOG_TAG, "Node ID of phone: " + nodeId);
googleApiClient.disconnect();
}
}).start();
}
private void initWidgets() {
findViewById(R.id.button_toast).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendToast();
}
});
}
private void sendToast() {
if (nodeId != null) {
new Thread(new Runnable() {
@Override
public void run() {
if (googleApiClient != null && !(googleApiClient.isConnected() || googleApiClient.isConnecting()))
googleApiClient.blockingConnect(CONNECTION_TIME_OUT_MS, TimeUnit.MILLISECONDS);
Wearable.MessageApi.sendMessage(googleApiClient, nodeId, MOBILE_PATH, null).await();
googleApiClient.disconnect();
}
}).start();
}
}
@Override
public void onMessageReceived(MessageEvent messageEvent) {
Log.v(LOG_TAG, "In onMessageReceived()");
if (messageEvent.getPath().equals("/wear")) {
Log.v(LOG_TAG, "Success!");
}
}
}
Mobile: ListenerService.java
package org.thecosmicfrog.toastdroidmessageapitutorial;
import android.util.Log;
import android.widget.Toast;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.wearable.MessageEvent;
import com.google.android.gms.wearable.Wearable;
import com.google.android.gms.wearable.WearableListenerService;
import java.util.concurrent.TimeUnit;
public class ListenerService extends WearableListenerService {
private final String LOG_TAG = ListenerService.class.getSimpleName();
private static GoogleApiClient googleApiClient;
private static final long CONNECTION_TIME_OUT_MS = 100;
private static final String WEAR_PATH = "/wear";
private String nodeId;
@Override
public void onMessageReceived(MessageEvent messageEvent) {
if (messageEvent.getPath().equals("/mobile")) {
nodeId = messageEvent.getSourceNodeId();
Log.v(LOG_TAG, "Node ID of watch: " + nodeId);
showToast(messageEvent.getPath());
reply(WEAR_PATH);
}
}
private void showToast(String message) {
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
}
private void reply(final String path) {
googleApiClient = new GoogleApiClient.Builder(getApplicationContext())
.addApi(Wearable.API)
.build();
Log.v(LOG_TAG, "In reply()");
Log.v(LOG_TAG, "Path: " + path);
if (googleApiClient != null && !(googleApiClient.isConnected() || googleApiClient.isConnecting()))
googleApiClient.blockingConnect(CONNECTION_TIME_OUT_MS, TimeUnit.MILLISECONDS);
Wearable.MessageApi.sendMessage(googleApiClient, nodeId, path, null).await();
googleApiClient.disconnect();
}
}
The Mobile MainActivity is pretty trivial so I've left it out for clarity.
