编辑：已经解决了，是信标的问题。
我在使用 Google Nearby Message API 时遇到了一些问题。我按照他们的页面（https://developers.google.com/nearby/messages/android/get-beacon-messages）上所说的做了，但它没有从信标中获得任何附件。
它连接到 Google API 客户端，它成功订阅但它永远不会到达onFound或onLost。
我尝试了 Andrew Bunner 在这篇文章中所说的（Find Eddystone Beacons using Nearby Google API），我到了 GITHUB 存储库（https://github.com/googlesamples/android-nearby/blob/master/messages/NearbyDevices/app/ src/main/java/com/google/android/gms/nearby/messages/samples/nearbydevices/MainActivity.java）并尝试了他们的应用程序，但它不适用于我的任何设备（摩托罗拉 Moto X 第一代和谷歌Tango 平板电脑），当我单击开关以打开发现附近的设备或共享设备信息时，它无法订阅：“无法订阅，状态 = 状态 {statusCode = 错误，分辨率 = null}”。
我检查了我的代码并与它们进行了比较，方法相似，但由于某种原因，订阅后从未显示附件。我检查了我的 API 密钥、清单、build.gradle、信标仪表板、OAuth 面板（并检查了附件确实在那里）并检查了它们是否属于同一个项目（信标和 API），但仍然没有不工作。我看到有些人有同样的问题，但我试着按照他们在答案中所说的去做，但似乎我做错了什么，我不明白它是什么。
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_beacon);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Nearby.MESSAGES_API, new MessagesOptions.Builder()
.setPermissions(NearbyPermissions.BLE)
.build())
.addConnectionCallbacks(this)
.enableAutoManage(this, this)
.build();
Log.i(TAG, "API connected");
}
mMessageListener = new MessageListener() {
@Override
public void onFound(Message message) {
String messageAsString = new String(message.getContent());
Log.d(TAG, "Found message: " + messageAsString);
//When a message is found
Log.i(TAG, "Message found: " + message.toString());
Log.i(TAG, "Message string: " + new String(message.getContent()));
Log.i(TAG, "Message namespaced type: " + message.getNamespace() +
"/" + message.getType());
}
@Override
public void onLost(Message message) {
//When a message is no longer detectable
String messageAsString = new String(message.getContent());
Log.d(TAG, "Lost sight of message: " + messageAsString);
}
};
}
private void subscribe() {
Log.i(TAG, "Subscribing.");
SubscribeOptions options = new SubscribeOptions.Builder()
.setStrategy(Strategy.BLE_ONLY)
.setCallback(new SubscribeCallback() {
@Override
public void onExpired() {
super.onExpired();
Log.i(TAG, "No longer subscribing");
}
})
.build();
Nearby.Messages.subscribe(mGoogleApiClient, mMessageListener, options)
.setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(@NonNull Status status) {
if (status.isSuccess()){
Log.i(TAG, "Subscibed succesfully");
}else{
Log.i(TAG, "Could not subscribe");
}
}
});
}
private void unsuscribe(){
Log.i(TAG, "Unsuscribing");
Nearby.Messages.unsubscribe(mGoogleApiClient, mMessageListener);
}
@Override
public void onStart() {
super.onStart();
mGoogleApiClient.connect();
Log.i(TAG, "onStart");
}
@Override
public void onConnected(Bundle connectionHint) {
Log.i(TAG, "GoogleApiClient connected");
subscribe();
}
@Override
public void onConnectionSuspended(int cause) {
Log.e(TAG, "GoogleApiClient disconnected with cause: " + cause);
}
@Override
public void onConnectionFailed(ConnectionResult result) {
if (result.hasResolution()) {
try {
result.startResolutionForResult(this, REQUEST_RESOLVE_ERROR);
} catch (IntentSender.SendIntentException e) {
e.printStackTrace();
}
} else {
Log.e(TAG, "GoogleApiClient connection failed");
}
}
@Override
public void onStop() {
unsuscribe();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
super.onStop();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_RESOLVE_ERROR) {
if (resultCode == RESULT_OK) {
mGoogleApiClient.connect();
} else {
Log.e(TAG, "GoogleApiClient connection failed. Unable to resolve.");
}
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}