Question

我的目标
我正在创建一个app / package，其中wear和掌上电脑能够在数据层上进行更改并收到有关此类更改的通知。我正在使用GoogleApiClient和DataApi.DataListener接口。

当前进展
截至目前，我的Wearable上的操作成功更新了数据层中的计数，然后通过显示的新计数检测到此更改并反映在手持设备中。

问题
检测只能以一种方式进行。虽然Wearable启动的更改成功更新了Handheld上的计数，但是在Wearable上未检测到手持设备发起的更改。

我尝试过什么
我已经看了StackExchange和Google几个小时，我还没有发现Wearable和Handheld都在更新数据层对象的情况。在大多数情况下，只有Handheld更新了一些东西和Wearable检测，反之亦然。单向通信对我来说很好。我需要双向。

手持代码片段

public class ListenActivity extends Activity implements
    DataApi.DataListener,
    GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener {
// ConnectionCallback methods, UI methods not included in snippet

private static final String COUNT_KEY = "com.example.count";
private int count = 0;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_listen);

    handler.post(displayCounts);

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addApi(Wearable.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
}

@Override
public void onDataChanged(DataEventBuffer dataEvents)
{
    for (DataEvent event : dataEvents)
    {
        if (event.getType() == DataEvent.TYPE_CHANGED)
        {
            DataItem item = event.getDataItem();
            if (item.getUri().getPath().compareTo("/count") == 0)
            {
                DataMap dataMap = DataMapItem.fromDataItem(item).getDataMap();
                count = dataMap.getInt(COUNT_KEY);
            }
        }
    }
}

// A UI button calls this method to reset the count, but the Wearable isn't calling its onDataChanged() method.
public void resetCount(View view)
{
    PutDataMapRequest putDataMapReq = PutDataMapRequest.create("/count");
    putDataMapReq.getDataMap().putInt(COUNT_KEY, 0);
    PutDataRequest putDataReq = putDataMapReq.asPutDataRequest();
    PendingResult<DataApi.DataItemResult> pendingResult =
            Wearable.DataApi.putDataItem(mGoogleApiClient, putDataReq);
} }

可穿戴代码片段

public class WearListenActivity extends Activity implements
    DataApi.DataListener,
    GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener {

// ConnectionCallback methods, UI methods not included in snippet

private static final String COUNT_KEY = "com.example.count";
private int count = 0;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mDismissOverlay = (DismissOverlayView) findViewById(R.id.dismiss_overlay);
    mDismissOverlay.showIntroIfNecessary();
    mGestureDetector = new GestureDetectorCompat(this, new GestureListener());

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addApiIfAvailable(Wearable.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
}

// This method is never called on the Wearable. 
// It isn't detecting the changes made by Handheld's resetCount() method?
@Override
public void onDataChanged(DataEventBuffer dataEvents)
{
    for (DataEvent event : dataEvents)
    {
        if (event.getType() == DataEvent.TYPE_CHANGED)
        {
            DataItem item = event.getDataItem();
            if (item.getUri().getPath().compareTo("/count") == 0)
            {
                DataMap dataMap = DataMapItem.fromDataItem(item).getDataMap();
                count = dataMap.getInt(COUNT_KEY);
            }
        }
    }
}

// User taps the screen, this method is called. Works perfectly fine since handheld updates its counts.
private void updateDataLayer()
{
    PutDataMapRequest putDataMapReq = PutDataMapRequest.create("/count");
    putDataMapReq.getDataMap().putInt(COUNT_KEY, count);
    PutDataRequest putDataReq = putDataMapReq.asPutDataRequest();
    PendingResult<DataApi.DataItemResult> pendingResult =
            Wearable.DataApi.putDataItem(mGoogleApiClient, putDataReq);
} }

Answer 1

这可能是因为您正在侦听Activity中的事件。我使用WearableListenerService并且它在两种方式都适用。

您可以在此处找到示例：Handling Data Layer Events

手持设备和可穿戴设备之间的Android双向通信

1 个答案: