我正在为Android佩戴制作表盘。表盘会偶尔向掌上电脑询问信息，这些信息将用于更新表盘。不幸的是，onDataChanged和onMessageReceived仅在表面第一次加载时出现，而且从不再出现（我可以切换到另一个表面和背面，并再次使用一次）
我认为大部分样板都来自于实例。所以在表盘中我有
@Override
public void onCreate() {
Log.d(TAG, "onCreate - Creating service...");
super.onCreate();
initGoogleApiClient();
}
private void initGoogleApiClient() {
mApiClient = new GoogleApiClient.Builder(mContext)
.addApi(Wearable.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
Log.d(TAG, "Calling connect on mApiClient...");
mApiClient.connect();
}
@Override
public void onMessageReceived(MessageEvent messageEvent) {
Log.d(TAG, "onMessageReceived: " + messageEvent.getPath() + " " + messageEvent.getData());
switch (messageEvent.getPath()) {
case "case 1":
Log.d(TAG,"some data was sent to us...");
if (!mApiClient.isConnected())
mApiClient.connect();
break;
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
Log.d(TAG,"onConnected - adding Listeners");
Wearable.DataApi.addListener(mApiClient, this);
Wearable.MessageApi.addListener(mApiClient, this);
}
@Override
public void onConnectionSuspended(int i) {
Log.d(TAG,"onConnection suspended");
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Log.e(TAG,"onConnection failed");
}
@Override
public void onDataChanged(DataEventBuffer dataEventBuffer) {
Log.d(TAG, "onDataChanged");
for (DataEvent event : dataEventBuffer) {
if (event.getType() == DataEvent.TYPE_CHANGED && event.getDataItem().getUri().getPath().equals("/image")) {
Log.d(TAG, "Matched TYPE_CHANGED and /image");
DataMapItem dataMapItem = DataMapItem.fromDataItem(event.getDataItem());
Asset photoAsset = dataMapItem.getDataMap().getAsset("photo");
loadBitmapFromAsset(photoAsset);
}
}
}
在掌上电脑中，日志记录显示在加载监视面（工作地点）和后续请求后，数据在第一个实例上以相同方式发送到可穿戴设备。不同之处在于后续请求，上述代码中没有任何记录发生，显示没有任何内容被触发。
有关如何发送数据的一些手持设备代码：
private void SendBitmap(final Bitmap bitmap) {
//snip - stuff to resize the bitmap
Log.d(TAG, "Resized image to " + cropped.getWidth() + "x" + cropped.getHeight());
final Bitmap croppedBitmap = cropped;
new Thread(new Runnable() {
@Override
public void run() {
if (!nodeConnected || !mGoogleApiClient.isConnected())
{
Log.d(TAG,"No node connected. Attempting connection for 5 seconds...");
mGoogleApiClient.blockingConnect(5, TimeUnit.SECONDS);
}
if (!nodeConnected)
{
Log.e(TAG, "Failed to connect to mGoogleApiClient within 5 seconds");
return;
}
if (mGoogleApiClient.isConnected()) {
Log.d(TAG, "Client is connected...");
Asset asset = createAssetFromBitmap(croppedBitmap);
PutDataMapRequest putDataMapRequest = PutDataMapRequest.create("/image").setUrgent();
putDataMapRequest.getDataMap().clear(); //clear down current stuff
putDataMapRequest.getDataMap().putAsset("photo", asset);
putDataMapRequest.getDataMap().putLong("timestamp", System.currentTimeMillis());
PutDataRequest request = putDataMapRequest.asPutDataRequest().setUrgent();
PendingResult<DataApi.DataItemResult> pendingResult =
Wearable.DataApi.putDataItem(mGoogleApiClient, request);
Log.d(TAG,"DataItem is put");
pendingResult.setResultCallback(new ResultCallback<DataApi.DataItemResult>() {
@Override
public void onResult(DataApi.DataItemResult dataItemResult) {
Log.d(TAG, "Sending task data: " + dataItemResult.getStatus().isSuccess());
}
});
}
else {
Log.w(TAG,"Client is NOT connected...");
}
}
}).start();
//send a message to trigger connection?
SendToDataLayerThread photoTrigger = new SendToDataLayerThread("case 1", "Photo sent...".getBytes());
photoTrigger.run();
Log.d(TAG, "Photo sent to the Google API");
}
private static Asset createAssetFromBitmap(Bitmap bitmap) {
final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteStream);
return Asset.createFromBytes(byteStream.toByteArray());
}
public class SendToDataLayerThread extends Thread {
String path;
byte[] message;
// Constructor to send a message to the data layer
SendToDataLayerThread(String p, byte[] msg) {
path = p;
message = msg;
}
public void run() {
Wearable.NodeApi.getConnectedNodes(mGoogleApiClient)
.setResultCallback(new ResultCallback<NodeApi.GetConnectedNodesResult>() {
@Override
public void onResult(NodeApi.GetConnectedNodesResult nodes) {
for (final Node node : nodes.getNodes()) {
Wearable.MessageApi.sendMessage(mGoogleApiClient, node.getId(), path, message).setResultCallback(new ResultCallback<MessageApi.SendMessageResult>() {
@Override
public void onResult(MessageApi.SendMessageResult sendMessageResult) {
if (sendMessageResult.getStatus().isSuccess()) {
Log.d(TAG, "Message: {" + message + "} sent to: " + node.getDisplayName());
} else {
// Log an error
Log.d(TAG, "ERROR: failed to send Message");
}
}
});
}
}
});
}
}
我尝试过的事情，基于其他帖子：
我在这一点上很难过。我确定我错过了一些明显的东西，但我不确定下一步该尝试什么...
答案 0 :(得分：1)
经过一系列的改变，我最终得到了它。在磨损应用程序上我最终得到：
：
@Override
public void onDataChanged(DataEventBuffer dataEvents) {
Log.d(TAG, "onDataChanged");
GoogleApiClient mApiClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.build();
ConnectionResult result = mApiClient.blockingConnect(250, TimeUnit.MILLISECONDS);
if (!result.isSuccess()) {
Log.e(TAG, "Failed to connect to mApiClient when receiving image...");
}
for (DataEvent event : dataEvents) {
if (event.getType() == DataEvent.TYPE_CHANGED && event.getDataItem().getUri().getPath().equals("/myapp")) {
Log.d(TAG, "Matched TYPE_CHANGED and /myapp");
DataMapItem dataMapItem = DataMapItem.fromDataItem(event.getDataItem());
Asset photoAsset = dataMapItem.getDataMap().getAsset("photo");
InputStream assetInputStream = Wearable.DataApi.getFdForAsset(mApiClient, photoAsset).await().getInputStream();
Bitmap background = BitmapFactory.decodeStream(assetInputStream);
Intent intent = new Intent("background");
intent.putExtra("message", background);
LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
}
}
}
在清单中：
<service
android:name=".MyWatchFace"
android:label="@string/my_watch_face_name"
android:permission="android.permission.BIND_WALLPAPER">
<meta-data ... />
<meta-data ... />
<intent-filter>
<action android:name="com.google.android.gms.wearable.DATA_CHANGED" />
<action android:name="android.service.wallpaper.WallpaperService" />
<category android:name="com.google.android.wearable.watchface.category.WATCH_FACE" />
</intent-filter>
</service>
<service android:name=".DataLayerListener">
<intent-filter>
<action android:name="com.google.android.gms.wearable.MESSAGE_RECEIVED" />
<action android:name="com.google.android.gms.wearable.CAPABILITY_CHANGED" />
<action android:name="com.google.android.gms.wearable.CHANNEL_EVENT" />
<action android:name="com.google.android.gms.wearable.DATA_CHANGED" />
<data
android:host="*"
android:path="/myapp"
android:pathPrefix="/myapp"
android:scheme="wear" />
</intent-filter>
</service>
表面本身注册BroadcastReceivers以处理从DataLayerListener广播的消息。
我认为明显的变化是重要的一点......希望如果你遇到同样的问题就会给出一个线索