我一直在按照本教程从 Android Wear 向 Android 手机发送消息，但它不起作用。这是我的代码：
穿
从 Minifest 开始，我实现了 google play services 元数据，如下所示：
<meta-data
android:name="com.google.android.wearable.standalone"
android:value="true" />
<meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
其次，我初始化了 GoogleApiClient，如下所示：
googleClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
然后，我实现了接口所需的所有方法：GoogleApiClient.ConnectionCallbacks 和 GoogleApiClient.OnConnectionFailedListener，如下所示：
@Override
public void onConnected(Bundle connectionHint) {
System.out.println("SESSION CONNECTED");
}
// Disconnect from the data layer when the Activity stops
@Override
protected void onStop() {
if (null != googleClient && googleClient.isConnected()) {
googleClient.disconnect();
}
super.onStop();
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
protected void onStart() {
super.onStart();
googleClient.connect();
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
System.out.println("FAILED TO CONNECT: "+connectionResult.getErrorMessage());
}
最后我实现了将文本发送到手机：
NodeApi.GetConnectedNodesResult nodes = Wearable.NodeApi.getConnectedNodes(googleClient).await();
for (Node node : nodes.getNodes()) {
MessageApi.SendMessageResult result = Wearable.MessageApi.sendMessage(googleClient, node.getId(), path, message.getBytes()).await();
if (result.getStatus().isSuccess()) {
System.out.println("Message: {" + message + "} sent to: " + node.getDisplayName());
}
else {
// Log an error
System.out.println("ERROR: failed to send Message");
}
}
问题是它似乎可以工作（当我开始磨损时，我得到了“SESSION CONNECTED”字符串），但它找不到任何配对设备来发送字符串，因为节点列表是空的。可以吗这个模拟器有问题吗？手机和穿戴设备可能都没有同步，这就是为什么他们找不到对方。
电话
只是为了展示洞的例子，我还包括电话部分：
清单.xml
<service android:name=".utils.ListenerService">
<intent-filter>
<action android:name="com.google.android.gms.wearable.BIND_LISTENER"
tools:ignore="WearableBindListener" />
</intent-filter>
</service>
监听服务
public class ListenerService extends WearableListenerService {
@Override
public void onMessageReceived(MessageEvent messageEvent) {
if (messageEvent.getPath().equals("/message_path")) {
final String message = new String(messageEvent.getData());
System.out.println("Message path received on watch is: " + messageEvent.getPath());
System.out.println("Message received on watch is: " + message);
}
else {
super.onMessageReceived(messageEvent);
}
}