Android 手持设备和可穿戴设备之间的双向通信

Question

我的目标
我正在创建一个 app/package，其中可穿戴设备和手持设备都能够在数据层上进行更改并收到此类更改的通知。我正在使用 GoogleApiClient 和 DataApi.DataListener 接口。

当前进度
截至目前，我的可穿戴设备上的一个操作成功更新了数据层中的计数，然后检测到此更改并通过显示的新计数反映在手持设备中。

问题
检测仅以一种方式起作用。虽然由可穿戴设备发起的更改成功更新在手持设备上计数，但在可穿戴设备上未检测到由手持设备发起的更改。

我试过的
我在 StackExchange 和 Google 上查看了几个小时，但我没有发现可穿戴设备和手持设备都在更新数据层对象的情况。在大多数情况下，只是手持设备更新了一些东西，而可穿戴设备正在检测，反之亦然。单向沟通对我来说效果很好。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收听 Activity 中的事件。我正在使用 WearableListenerService，它在两种情况下都适用。

你可以在这里找到一个例子：Handling Data Layer Events

Android 手持设备和可穿戴设备之间的双向通信

Android Two Way Communication Between Handheld and Wearable

android

wear-os

data-synchronization

google-data-api

android-wear-data-api