android - 永远不会调用 OnDataChanged

Question

我正在尝试数据项 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？。我读了this和 this但我仍然不清楚我应该更改什么以输入已更改的数据

Answer 1

如果您使用的是DataApi.DataListener，那么您必须在GoogleApiClient 连接后添加Listener。类似于:Wearable.DataApi.addListener(mGoogleApiClient, this) 在您的 GoogleApiClient.ConnectionCallbacks 中。

如果您使用的是 WearableListenerService，请确保您的 AndroidManifest.xml 中的接收/监听端具有类似的代码，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>

另外请记住，仅当数据实际更改时，onDataChanged 才会被调用。假设旧数据是 ("Person", "Bob") 并且您用相同的数据 ("Person", "Bob") 替换它，那么 onDataChanged 不会被触发，因为数据会事实上并没有改变。但是，如果您改为输入 ("Person", "Bob2")，onDataChanged 将被触发。