我正在尝试使用Google附近使用超声波（不是BLE或WiFi）发送消息。我不知道为什么它不起作用。 我没有找到任何额外的步骤来完成这项工作。
没有错误。 Log说出版是成功的。但订阅者根本没有反应
应用是否需要麦克风权限？ app应该检查其他什么吗？ iOS和Android之间是否有现成的超声波信息样本？
iOS部分：
@implementation ViewController {
GNSMessageManager *_messageManager;
}
- (void)viewDidLoad {
[super viewDidLoad];
_messageManager = [[GNSMessageManager alloc]
initWithAPIKey:@"MY_API_KEY"
paramsBlock:^(GNSMessageManagerParams *params) {
params.microphonePermissionErrorHandler = ^(BOOL hasError) {
NSLog(@"Microphone Permission Error:%@", hasError ? @"YES" : @"NO");
};
params.bluetoothPowerErrorHandler = ^(BOOL hasError) {
NSLog(@"Bluetooth Power Error:%@", hasError ? @"YES" : @"NO");
};
params.bluetoothPermissionErrorHandler = ^(BOOL hasError) {
NSLog(@"Bluetooth Permission Error:%@", hasError ? @"YES" : @"NO");
};
}];
[GNSMessageManager setDebugLoggingEnabled:YES];
[GNSPermission setGranted:YES];
GNSPermission *nearbyPermission = [[GNSPermission alloc] initWithChangedHandler:^(BOOL granted) {
NSLog(@"Nearby Permission:%@", granted ? @"YES" : @"NO");
}];
id <GNSSubscription> subscription = [_messageManager subscriptionWithMessageFoundHandler:^(GNSMessage *message) {
NSLog(@"subscriptionWithMessageFoundHandler");
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Google Nearby Message" message:[[NSString alloc] initWithData:message.content encoding:NSUTF8StringEncoding] preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDefault handler:nil]];
[self presentViewController:alertController animated:YES completion:nil];
}
messageLostHandler:^(GNSMessage *message) {
// Remove the name from the list
}
paramsBlock:^(GNSSubscriptionParams *subscriptionParams) {
subscriptionParams.strategy = [GNSStrategy strategyWithParamsBlock:^(GNSStrategyParams *params) {
params.discoveryMediums = kGNSDiscoveryMediumsAudio;
params.discoveryMode = kGNSDiscoveryModeScan;
}];
}
];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)publishDidClick:(id)sender {
NSString *string = self.publisherField.text;
if (string == nil || string.length == 0) {
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Google Nearby" message:@"Please put some text into field before publishing" preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDefault handler:nil]];
[self presentViewController:alertController animated:YES completion:nil];
} else {
@try {
GNSMessage *gnsMessage = [GNSMessage messageWithContent:[string dataUsingEncoding:NSUTF8StringEncoding]];
id <GNSPublication> publication = [_messageManager publicationWithMessage:gnsMessage
paramsBlock:^(GNSPublicationParams *params) {
params.strategy = [GNSStrategy strategyWithParamsBlock:^(GNSStrategyParams *params) {
params.discoveryMediums = kGNSDiscoveryMediumsAudio;
}];
}];
}
@catch (NSException *exception) {
NSLog(@"Exception occurred: %@, %@", exception, [exception userInfo]);
}
}
}
iOS日志：
2017-02-17 22:33:33.701925 GoogleNearbySample[5727:1608902] Nearby Permission:YES
2017-02-17 22:33:35.842523 GoogleNearbySample[5727:1608902] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /private/var/containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
2017-02-17 22:33:35.853836 GoogleNearbySample[5727:1608902] [MC] Reading from public effective user settings.
2017-02-17 22:33:40.630279 GoogleNearbySample[5727:1608902] Publish (mediums: 1, broadcast/scan: 3, beacons: 0/0/0, background: 0)
2017-02-17 22:33:40.677551 GoogleNearbySample[5727:1608902] Unpublish
2017-02-17 22:33:40.681520 GoogleNearbySample[5727:1608902] Tokens: 0 good, 0 bad, 0 broadcast
2017-02-17 22:33:40.681663 GoogleNearbySample[5727:1608902] Report RPC request: 0 token(s), 0 beacon(s), 0 directive(s)
2017-02-17 22:33:40.705243 GoogleNearbySample[5727:1608902] Report RPC request: Publish: 1
2017-02-17 22:33:40.705933 GoogleNearbySample[5727:1608902] Report RPC request: Unpublish: 1
2017-02-17 22:33:41.625510 GoogleNearbySample[5727:1608902] Report RPC response: Success
2017-02-17 22:33:41.626823 GoogleNearbySample[5727:1608902] Report RPC response: 6 directive(s), 0 token(s), 0 message(s), 1 publication results(s), 0 subscription results(s)
2017-02-17 22:33:41.641955 GoogleNearbySample[5727:1608902] Tokens: 0 good, 0 bad, 0 broadcast
2017-02-17 22:33:41.642170 GoogleNearbySample[5727:1608902] Report RPC request: 0 token(s), 0 beacon(s), 0 directive(s)
2017-02-17 22:33:41.889006 GoogleNearbySample[5727:1608902] Report RPC response: Success
2017-02-17 22:33:41.889370 GoogleNearbySample[5727:1608902] Report RPC response: 0 directive(s), 0 token(s), 0 message(s), 0 publication results(s), 0 subscription results(s)
2017-02-17 22:33:46.337377 GoogleNearbySample[5727:1608902] Publish (mediums: 1, broadcast/scan: 3, beacons: 0/0/0, background: 0)
2017-02-17 22:33:46.342647 GoogleNearbySample[5727:1608902] Unpublish
2017-02-17 22:33:46.350383 GoogleNearbySample[5727:1608902] Tokens: 0 good, 0 bad, 0 broadcast
2017-02-17 22:33:46.350746 GoogleNearbySample[5727:1608902] Report RPC request: 0 token(s), 0 beacon(s), 0 directive(s)
2017-02-17 22:33:46.351382 GoogleNearbySample[5727:1608902] Report RPC request: Publish: 1
2017-02-17 22:33:46.351675 GoogleNearbySample[5727:1608902] Report RPC request: Unpublish: 1
2017-02-17 22:33:46.937869 GoogleNearbySample[5727:1608902] Report RPC response: Success
2017-02-17 22:33:46.938223 GoogleNearbySample[5727:1608902] Report RPC response: 6 directive(s), 0 token(s), 0 message(s), 1 publication results(s), 0 subscription results(s)
2017-02-17 22:33:46.951400 GoogleNearbySample[5727:1608902] Tokens: 0 good, 0 bad, 0 broadcast
2017-02-17 22:33:46.951618 GoogleNearbySample[5727:1608902] Report RPC request: 0 token(s), 0 beacon(s), 0 directive(s)
2017-02-17 22:33:47.174414 GoogleNearbySample[5727:1608902] Report RPC response: Success
2017-02-17 22:33:47.174676 GoogleNearbySample[5727:1608902] Report RPC response: 0 directive(s), 0 token(s), 0 message(s), 0 publication results(s), 0 subscription results(s)
Android部分：
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private static final int MY_PERMISSIONS_REQUEST_READ_CONTACTS = 12341;
private GoogleApiClient mGoogleApiClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
View view = findViewById(R.id.button);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
PublishOptions publishOptions = new PublishOptions.Builder().setStrategy(new Strategy.Builder().setDiscoveryMode(Strategy.DISCOVERY_MODE_SCAN)
.setDistanceType(Strategy.DISTANCE_TYPE_EARSHOT).build()).build();
Nearby.Messages.publish(mGoogleApiClient, new Message("Hello Artur".getBytes()), publishOptions).setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(@NonNull Status status) {
Log.i("Nearby", status.getStatusMessage());
}
});
}
});
int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
if (permissionCheck == PackageManager.PERMISSION_GRANTED) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Nearby.MESSAGES_API)
.addConnectionCallbacks(this)
.enableAutoManage(this, this)
.build();
} else {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.RECORD_AUDIO},
MY_PERMISSIONS_REQUEST_READ_CONTACTS);
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
SubscribeOptions subscribeOptions = new SubscribeOptions.Builder()
.setStrategy(new Strategy.Builder().setDiscoveryMode(Strategy.DISCOVERY_MODE_SCAN)
.setDistanceType(Strategy.DISTANCE_TYPE_EARSHOT).build()).build();
Nearby.Messages.subscribe(mGoogleApiClient, new MessageListener() {
@Override
public void onFound(Message message) {
super.onFound(message);
Log.i("Nearby", "Subscribed found.");
Toast.makeText(getApplicationContext(), new String(message.getContent()), Toast.LENGTH_LONG).show();
}
}, subscribeOptions).setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(Status status) {
if (status.isSuccess()) {
Log.i("Nearby", "Subscribed successfully.");
} else {
Log.i("Nearby", "Could not subscribe.");
// Check whether consent was given;
// if not, prompt the user for consent.
handleUnsuccessfulNearbyResult(status);
}
}
});
}
private void handleUnsuccessfulNearbyResult(Status status) {
Log.i("Nearby", "Processing error, status = " + status);
}
@Override
public void onConnectionSuspended(int i) {
Log.d("onConnectionSuspended", String.valueOf(i));
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Log.d("onConnectionFailed", connectionResult.getErrorMessage());
}
}
Android日志：
02-17 22:32:56.158 11325-11325/? I/Nearby: Subscribed successfully.
02-17 22:32:59.929 11325-11325/? D/NearbyMessagesClient: Emitting client lifecycle event ACTIVITY_STOPPED
02-17 22:32:59.930 11325-11325/? D/NearbyMessagesClient: Emitting client lifecycle event CLIENT_DISCONNECTED
02-17 22:33:28.890 11325-11325/? I/Nearby: Subscribed successfully.
02-17 22:33:45.867 11325-11325/? I/Nearby: SUCCESS
02-17 22:33:46.542 11325-11325/? I/Nearby: SUCCESS
02-17 22:33:47.137 11325-11325/? I/Nearby: SUCCESS
02-17 22:33:47.779 11325-11325/? I/Nearby: SUCCESS
02-17 22:33:48.422 11325-11325/? I/Nearby: SUCCESS
02-17 22:33:49.053 11325-11325/? I/Nearby: SUCCESS
02-17 22:34:18.477 11325-11325/? D/NearbyMessagesClient: Emitting client lifecycle event ACTIVITY_STOPPED
02-17 22:34:18.479 11325-11325/? D/NearbyMessagesClient: Emitting client lifecycle event CLIENT_DISCONNECTED
02-17 22:36:47.996 11325-11325/? D/NearbyMessagesClient: Failed to emit client lifecycle event ACTIVITY_STOPPED due to GmsClient being disconnected
02-17 22:36:47.997 11325-11325/? D/NearbyMessagesClient: Failed to emit client lifecycle event CLIENT_DISCONNECTED due to GmsClient being disconnected
答案 0 :(得分：2)
Artur，您需要将发布对象存储在属性或ivar中。只要发布对象存在，该发布就是活动的。要停止发布，请释放发布对象。订阅同上。
我意识到Cocoapod documentation中的发布/子代码示例具有误导性。我将在下一个版本中修复它。