Android Wear 有时收不到来自手机的消息

Question

我正在开发一款从手表获取传感器数据的应用。我使用手机开始采集，但有些情况下手表和手机似乎完美连接，但当我发送“开始采集”命令时没有任何反应。手表必须重新启动才能开始接受命令。

这就是我从手机建立连接的方式：

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

这就是我从手机发送数据的方式：

if (mGoogleApiClient != null && mGoogleApiClient.isConnected() ) {

        final PutDataMapRequest putDataMapReq = PutDataMapRequest.create("/toWear");
        putDataMapReq.getDataMap().putInt("duration", duration); // Duration of data, selected in TimeSelector
        putDataMapReq.getDataMap().putString("type", type);
        putDataMapReq.getDataMap().putString("name", name);
        putDataMapReq.getDataMap().putString("Starting Time", startingTime); // Starting Time of data
        putDataMapReq.getDataMap().putBoolean("Stop", false); //Stop is set True when Phone has to stop watch from taking data
        putDataMapReq.setUrgent();
        PutDataRequest request = putDataMapReq.asPutDataRequest();
        Wearable.DataApi.putDataItem(mGoogleApiClient, request).setResultCallback(new ResultCallback<DataApi.DataItemResult>() {
            @Override
            public void onResult(DataApi.DataItemResult dataItemResult) {
            }
        });

    }
    else
    {
        Toast.makeText(context, "Not Connected properly", Toast.LENGTH_LONG).show();

    }

这就是我在智能手表中接受数据的方式：

  public void onDataChanged(DataEventBuffer dataEvents) {
    count=0;
    broadcaster = LocalBroadcastManager.getInstance(this);

    for (DataEvent event : dataEvents) {
        if (event.getType() == DataEvent.TYPE_CHANGED) {
            // DataItem changed
            DataItem item = event.getDataItem();

            if (item.getUri().getPath().compareTo("/toWear") == 0) {
                DataMap dataMap = DataMapItem.fromDataItem(item).getDataMap();


                int duration = dataMap.getInt("duration");
                stop=dataMap.getBoolean("Stop");
                String type = dataMap.getString("type");
                String name = dataMap.getString("name");
                String startingTime= dataMap.getString("Starting Time");
                //  updateCount(dataMap.getInt(COUNT_KEY));


                Bundle b= new Bundle();
                b.putInt("duration",duration);
                b.putString("Starting Time",startingTime);

                if(!stop) {
                    AcquisitionStatus=true;
                    setAcquisitionStatus(true);
                    Intent sensorServ = new Intent(MyService.this, SensorService.class);
                    sensorServ.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_NO_HISTORY);
                    sensorServ.putExtras(b);
                    startService(sensorServ);

                }
                else {
                    AcquisitionStatus = false;
                    setAcquisitionStatus(false);
                }

            }
        } else if (event.getType() == DataEvent.TYPE_DELETED) {
            // DataItem deleted
        }
    }
}

我想知道，为什么有时即使建立了正确的连接，智能手表也无法从手机接收数据。

Answer 1

Android Wear Data API 确保 100% 的数据传输。如果这两个数据相同，则不会发送数据，因为它不会更新屏幕上的任何内容。检查数据是否相同。