OnDataChanged 永远不会被调用

我正在尝试 dataitem APi，这是我的代码

mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
                @Override
                public void onConnected(Bundle connectionHint) {
                    Log.d("Inside", "onConnected: " + connectionHint);
                    Toast.makeText(getApplicationContext(),"Inside On connected",Toast.LENGTH_SHORT).show();
                    // Now you can use the Data Layer API
                    //Creating Dataitem
                    PutDataMapRequest dataMapRequest = PutDataMapRequest.create("/count");
                    dataMapRequest.setUrgent();
                    DataMap datamap=dataMapRequest.getDataMap();
                    PutDataRequest putDataRequest=dataMapRequest.asPutDataRequest();
                    datamap.putString("key", "Value");
                    PendingResult<DataApi.DataItemResult> pendingResult =
                            Wearable.DataApi.putDataItem(mGoogleApiClient, putDataRequest);
                }
                @Override
                public void onConnectionSuspended(int cause) {
                    Log.d("Inside", "onConnectionSuspended: " + cause);
                }
            })
            .addOnConnectionFailedListener(new GoogleApiClient.OnConnectionFailedListener() {
                @Override
                public void onConnectionFailed(ConnectionResult result) {
                    Log.d("Inside", "onConnectionFailed: " + result);
                }
            })
            // Request access only to the Wearable API
            .addApiIfAvailable(Wearable.API)
            .build();
    mGoogleApiClient.connect();
}

@Override
public void onDataChanged(DataEventBuffer dataEventBuffer) {
    Log.d("Inside","onDataChanged");
}

我错过了什么来触发数据更改？我读this and this但我仍然不清楚我应该更改什么来输入更改的数据

如果您使用DataApi.DataListener，则必须在GoogleApiClient连接后添加Listener。就像是：Wearable.DataApi.addListener(mGoogleApiClient, this)在你的里面GoogleApiClient.ConnectionCallbacks.

如果您使用 Wea​​rableListenerService，请确保接收/监听端的 AndroidManifest.xml 中有类似的代码，如下所示：

<service android:name=".YourCustomWearableListenerService">
    <intent-filter>
        <action android:name="com.google.android.gms.wearable.DATA_CHANGED"/>
            <data android:scheme="wear" 
                  android:host="*" 
                  <!-- I believe pathPrefix is optional, removing it will make the service listener to all data change events -->
                  android:pathPrefix="/YourDataMapPathPrefix"/>
        </intent-filter>
</service>

还要记住onDataChanged仅当数据实际更改时才会接到电话。假设旧数据是（“Person”，“Bob”），您将其替换为相同的数据（“Person”，“Bob”），然后onDataChanged不会被触发，因为数据实际上没有改变。但onDataChanged如果你输入 ("Person", "Bob2") 来代替，将会被触发。