android - WearListenerService onDataChanged strange behavior

Question

I want to make bidirectional data transfer between Android Wear and Handheld. All seems to be good except triggering onDataChanged on Handheld. It triggers only then I plug inout USB cable, connected to the PC. So I don't understand why it's happen.

Here is my code:

WearListenerService on Handheld:

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.wearable.DataApi;
import com.google.android.gms.wearable.DataEvent;
import com.google.android.gms.wearable.DataEventBuffer;
import com.google.android.gms.wearable.DataMap;
import com.google.android.gms.wearable.DataMapItem;
import com.google.android.gms.wearable.Node;
import com.google.android.gms.wearable.NodeApi;
import com.google.android.gms.wearable.PutDataMapRequest;
import com.google.android.gms.wearable.PutDataRequest;
import com.google.android.gms.wearable.Wearable;
import com.google.android.gms.wearable.WearableListenerService;

import java.util.List;

import ru.orangesoftware.financisto.db.DatabaseAdapter;
import ru.orangesoftware.financisto.model.Category;
import ru.orangesoftware.financisto.model.CategoryTree;
import ru.orangesoftware.financisto.utils.Log;

public class WearService extends WearableListenerService implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener
{
    private static final String WEARABLE_DATA_PATH = "/wearable_data";
    private static final String HANDHELD_DATA_PATH = "/handheld_data";

    private SendToDataLayerThread s;
    GoogleApiClient googleClient;

    private DatabaseAdapter db;

    @Override
    public void onCreate()
    {
        super.onCreate();

        Log.d("WearService Created");
        db = new DatabaseAdapter(this);
        db.open();

        initGoogleApiClient();
    }

    @Override
    public void onDataChanged(DataEventBuffer dataEvents)
    {
        Log.d("In dataChanged");

        DataMap dataMap;
        for (DataEvent event : dataEvents)
        {

            // Check the data type
            if (event.getType() == DataEvent.TYPE_CHANGED)
            {
                // Check the data path
                String path = event.getDataItem().getUri().getPath();
                if (path.equals(HANDHELD_DATA_PATH))
                {
                    dataMap = DataMapItem.fromDataItem(event.getDataItem()).getDataMap();
                    Log.v("Path phone: " + path);
                    Log.v("DataMap received from watch: " + dataMap);

                    Intent messageIntent = new Intent();
                    messageIntent.setAction(Intent.ACTION_SEND);
                    messageIntent.putExtra("time", System.currentTimeMillis());
                    messageIntent.putExtra("DataMap", dataMap.toBundle());
                    LocalBroadcastManager.getInstance(this).sendBroadcast(messageIntent);

                    // Create a DataMap object and send it to the data layer
                    dataMap = new DataMap();
                    dataMap.putString("Pong", "Pong" + String.valueOf(System.currentTimeMillis()));
                    dataMap.putLong("time", System.currentTimeMillis());

                    //Requires a new thread to avoid blocking the UI
                    s = new SendToDataLayerThread(WEARABLE_DATA_PATH, dataMap);
                    s.start();
                }
            }
        }
    }

    private void initGoogleApiClient()
    {
        // Build a new GoogleApiClient for the the Wearable API

        Log.d("Initialaizing GoogleClient");

        if (googleClient == null)
        {
            googleClient = new GoogleApiClient.Builder(this)
                    .addApi(Wearable.API)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .build();
        }

        if (!googleClient.isConnected())
        {
            Log.d("Tring to connect to GoogleApi...");

            googleClient.connect();

        }

        Log.d("Google Client ID = " + googleClient.toString());
    }

    // Disconnect from the data layer when the Activity stops
    @Override
    public void onDestroy()
    {
        super.onDestroy();

        Log.d("WearService: onDestroy");

        if (null != googleClient && googleClient.isConnected())
        {
            googleClient.disconnect();
        }

        if (db != null)
        {
            db.close();
        }

    }



  @Override
public void onConnected(Bundle bundle)
{
    Log.d("onConnected entered");
    Log.d("GoogleAPI now status:" + googleClient.isConnected());
}

    @Override
    public void onConnectionSuspended(int i)
    {

    }

    @Override
    public void onConnectionFailed(ConnectionResult result) {
        Log.e("Connection to google api has failed. " + result.getErrorMessage());
    }

    class SendToDataLayerThread extends Thread
    {
        String path;
        DataMap dataMap;

        // Constructor for sending data objects to the data layer
        SendToDataLayerThread(String p, DataMap data)
        {
            path = p;
            dataMap = data;
        }

        public void run()
        {
            NodeApi.GetConnectedNodesResult nodes = Wearable.NodeApi.getConnectedNodes(googleClient).await();
            for (Node node : nodes.getNodes())
            {

                // Construct a DataRequest and send over the data layer
                PutDataMapRequest putDMR = PutDataMapRequest.create(path);
                putDMR.getDataMap().putAll(dataMap);
                PutDataRequest request = putDMR.asPutDataRequest();
                DataApi.DataItemResult result = Wearable.DataApi.putDataItem(googleClient, request).await();
                if (result.getStatus().isSuccess())
                {
                    Log.v("DataMap: " + dataMap + " sent to: " + node.getDisplayName() + "; path=" + path);
                } else
                {
                    // Log an error
                    Log.v("ERROR: failed to send DataMap");
                }
            }
        }
    }
}

WearListenerService on Wear:

import android.content.Intent;
import android.os.Bundle;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.wearable.DataApi;
import com.google.android.gms.wearable.DataEvent;
import com.google.android.gms.wearable.DataEventBuffer;
import com.google.android.gms.wearable.DataMap;
import com.google.android.gms.wearable.DataMapItem;
import com.google.android.gms.wearable.Node;
import com.google.android.gms.wearable.NodeApi;
import com.google.android.gms.wearable.PutDataMapRequest;
import com.google.android.gms.wearable.PutDataRequest;
import com.google.android.gms.wearable.Wearable;
import com.google.android.gms.wearable.WearableListenerService;

public class ListenerService extends WearableListenerService implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener
{
    private static final String WEARABLE_DATA_PATH = "/wearable_data";
    private static final String HANDHELD_DATA_PATH = "/handheld_data";

    GoogleApiClient googleClient;

    private SendToDataLayerThread s;

    @Override
    public void onDataChanged(DataEventBuffer dataEvents)
    {
        Log.d("In dataChanged");

        DataMap dataMap;
        for (DataEvent event : dataEvents)
        {
            // Check the data type
            if (event.getType() == DataEvent.TYPE_CHANGED)
            {
                // Check the data path
                String path = event.getDataItem().getUri().getPath();
                Log.d("DataChanged: " + "path = " + path);
                if (path.equals(WEARABLE_DATA_PATH))
                {
                    dataMap = DataMapItem.fromDataItem(event.getDataItem()).getDataMap();
                    Log.d("DataChanged: " + "dataMap received on watch: " + dataMap);
                }

            }
        }
    }

    private void initGoogleApiClient()
    {
        if (googleClient == null)
        {
            Log.d("Building google client id...");
            googleClient = new GoogleApiClient.Builder(this)
                    .addApi(Wearable.API)
                            .addConnectionCallbacks(this)
                            .addOnConnectionFailedListener(this)
                    .build();

            Log.d("Google client id = " + googleClient.toString());
        }

        if (!googleClient.isConnected())
        {
            googleClient.connect();
        }

        Log.d("Google Client ID = " + googleClient.toString());
    }

    // Placeholders for required connection callbacks
    @Override
    public void onConnectionSuspended(int cause)
    {
    }

    @Override
    public void onConnected(Bundle connectionHint)
    {
        Log.v("OnConnected entered");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult)
    {
    }

    // Connect to the data layer when the Activity starts
    @Override
    public void onCreate()
    {
        super.onCreate();
        initGoogleApiClient();
    }

    // Disconnect from the data layer when the Activity stops
    @Override
    public void onDestroy()
    {
        if (null != googleClient && googleClient.isConnected())
        {
            Log.d("onDestroy: Disconnecting googleClient");
            googleClient.disconnect();
        }

        super.onDestroy();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startid)
    {
        Log.d("onStartCommand: Service was started.");

        // Create a DataMap object and send it to the data layer
        DataMap dataMap = new DataMap();
        dataMap.putString("ping", "ping" + String.valueOf(System.currentTimeMillis()));
        dataMap.putLong("time", System.currentTimeMillis());
        //Requires a new thread to avoid blocking the UI

        s = new SendToDataLayerThread(HANDHELD_DATA_PATH, dataMap);
        s.start();

        return super.onStartCommand(intent, flags, startid);
    }

    class SendToDataLayerThread extends Thread
    {
        String path;
        DataMap dataMap;

        // Constructor for sending data objects to the data layer
        SendToDataLayerThread(String p, DataMap data)
        {
            path = p;
            dataMap = data;
        }

        public void run()
        {
            NodeApi.GetConnectedNodesResult nodes = Wearable.NodeApi.getConnectedNodes(googleClient).await();
            for (Node node : nodes.getNodes())
            {

                final Node node2 = node;

                // Construct a DataRequest and send over the data layer
                PutDataMapRequest putDMR = PutDataMapRequest.create(path);
                putDMR.getDataMap().putAll(dataMap);
                PutDataRequest request = putDMR.asPutDataRequest();

                PendingResult<DataApi.DataItemResult> pendingResult = Wearable.DataApi.putDataItem(googleClient, request);
                pendingResult.setResultCallback(new ResultCallback<DataApi.DataItemResult>()
                {
                    @Override
                    public void onResult(DataApi.DataItem

Answer 1

Per the Google Play services 8.3 blog post:

With Google Play services 8.3, we’ve updated the DataApi to allow for urgency in how data items are synced. Now, a priority can be added to the data item to determine when it should be synced. For example, if you are building an app that requires immediate syncing, such as a remote control app, it can still be done immediately by calling setUrgent(), but for something such as updating your contacts, you could tolerate some delay. Non-urgent DataItems may be delayed for up to 30 minutes, but you can expect that in most cases they will be delivered within a few minutes. Low priority is now the default, so setUrgent() is needed to obtain the previous timing.

So make sure you call setUrgent() on your data requests if you want them to immediately be synced to other connected devices.