简短摘要:我正在尝试使用 PutDataRequest 和 GoogleApiClient 将数据从 Android Wear watch 发送到 Android 手机。日志似乎显示数据已成功发送，但 onDataChanged 从未触发。我正在使用 Android Studio 1.0.2。我没有使用任何模拟器，而是使用我拥有的 Android Wear watch ——我已经通过 Android Wear 设备和手机上的 Android Wear 应用程序配对并启用调试。在手机和穿戴设备的 AndroidManifest.xml 中，我包含了 com.google.android.gms.version。

在 Android 手机(Android 4.4.4 版本)上，我使用了一个监听器服务，它通过 AndroidManifest.xml 绑定(bind)并通过手机上的主要 Activity 启动。从日志中，我可以确认服务已在手机上成功创建，但从未收到任何数据(onDataChanged 从不触发——准确地说)。

    <!-- Phone manifest, registers the listener -->
    <service android:name=".DataLayerListenerService" >
        <intent-filter>
            <action android:name="com.google.android.gms.wearable.BIND_LISTENER" />
        </intent-filter>
    </service>

这是在手机上运行的监听器服务:

public class DataLayerListenerService extends WearableListenerService {
    private static final String TAG = DataLayerListenerService.class.getName();
    private GoogleApiClient mGoogleApiClient;

    private static final String WEARABLE_DATA_PATH = "/audio";

    @Override
    public void onCreate() {
        // I can see this fires properly on the Android mobile phone
        Logger.d(TAG, "onCreate");
    }

    @Override
    public void onDataChanged(DataEventBuffer dataEvents) {
        // This never fires on the Android mobile phone, even though Wear says data was sent successfully
        Logger.d(TAG, "on change");
    }
}

在 Wear 设备上，我有一个创建 Google API 客户端的主要 Activity 。我使用 UI 按钮从音频生成输入(代码未显示)，我知道由于日志记录，它可以正常工作。然后我尝试将这些数据从可穿戴设备发送到手机。在日志中，我看到“result available. Status: Status{statusCode=SUCCESS, resolution=null}”(我使用结果回调来跟踪)。

public class MainActivity extends Activity implements
    GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener {
    private static final String TAG = MainActivity.class.getName();
    private static final int SPEECH_REQUEST_CODE = 1;

    private static final int RECORDER_SAMPLERATE = 44100;
    private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_STEREO;
    private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;

    private TextView mTextView;
    private AudioRecord recorder;
    private int bufferSize = 0;
    private Thread recordingThread = null;
    private GoogleApiClient mGoogleApiClient;
    private volatile boolean isRecording;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.d(TAG, "Creating MainActivity");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
        stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
            @Override
            public void onLayoutInflated(WatchViewStub stub) {
                mTextView = (TextView) stub.findViewById(R.id.text);
            }
        });

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

    // Connect to the data layer when the Activity starts
    @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

    protected void onResume() {
        if (null != mGoogleApiClient && !mGoogleApiClient.isConnected()) {
            mGoogleApiClient.connect();
        }
        super.onResume();
    }

    @Override
    protected void onStop() {
        if (null != mGoogleApiClient && mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
        super.onStop();
    }

    // Placeholders for required connection callbacks
    @Override
    public void onConnectionSuspended(int cause) {
        Log.d(TAG, "Connection suspended");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.d(TAG, "Connection failed");
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        Log.d(TAG, "Connected successfully");
    }

    // This is invoked from the UI, via a helper method not shown. Logs show the method is invoked fine.
    private void processRawAudioData() {
        byte data[] = new byte[bufferSize];
        int read = 0;
        while(isRecording) {
            read = recorder.read(data, 0, bufferSize);

            if(AudioRecord.ERROR_INVALID_OPERATION != read) {
                Log.d(TAG, "Successfully read " + data.length + " bytes of audio");
                Log.d(TAG, "Initial ten bytes: " + data[0] + data[1] + data[2] + data[3]
                    + data[4] + data[5] + data[6] + data[7] + data[8] + data[9] + data[10]);

                Asset myAsset = Asset.createFromBytes(data);
                PutDataRequest request = PutDataRequest.create("/audio");
                // might need to change time each time for other end to see change.
                request.putAsset("profileImage", myAsset);
                PendingResult<DataApi.DataItemResult> result =
                    Wearable.DataApi.putDataItem(mGoogleApiClient, request);
                result.setResultCallback(new ResultCallback<DataApi.DataItemResult>() {
                    @Override
                    public void onResult(DataApi.DataItemResult dataItemResult) {
                     // LOGS SHOW STATUS "MainActivity﹕ result available. Status: Status{statusCode=SUCCESS, resolution=null}"   
                     Log.d(TAG, "result available. Status: " + dataItemResult.getStatus());
                    }
                });
            }
        }
    }
}

最佳答案

为了让 WearableListenerService 触发 'onDataChanged' 事件，主应用程序中的 applicationId和可穿戴应用必须匹配(build.gradle 文件)。

另外，不能发送静态数据，数据必须变化。这意味着您的 PutDataMapRequest 对象中的数据必须发生变化。

关于Android Wear 向 Android 手机发送数据，但手机似乎从未收到过数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28034315/