WiFiAware对等体之间的RTT测距无法工作

我们可以使用Android的Network Service Discovery框架在WiFi Aware网络中查找对等体，并使用WiFi Aware API启用RTT功能。以下是示例代码：

// 在应用程序中注册网络服务发现回调 class MyDiscoveryListener extends DiscoverySessionCallback { @Override public void onServiceDiscovered(NsdServiceInfo service) { if (service.getServiceName().equals("MyWiFiAwareService")) {

  // 获取WiFi Aware会话
  WifiAwareManager mgr = (WifiAwareManager)context.getSystemService(Context.WIFI_AWARE_SERVICE);
  WifiAwareSession session = mgr.attach(null, null);

  // 发现设备并创建WiFi Aware连接
  PeerHandle peerHandle = session.createAwarePeerHandle(service.getServiceName(), service.getServiceType());
  DiscoverySession discoverySession = session.createDiscoverySession(new DiscoverySessionCallback(), null);

  // 在连接上启用RTT
  RangingRequest request = new RangingRequest.Builder().addWifiAwarePeer(peerHandle).build();
  RangingResult rangingResult = discoverySession.rangeDevices(request);

  // 处理测距结果
  if (rangingResult.getStatus() == RangingResult.STATUS_SUCCESS) {
    // RTT测量成功
    double distanceMeters = rangingResult.getDistanceMm() / 1000.0;
  } else {
    // RTT测量失败
    Log.e(TAG, "Ranging failed: " + rangingResult.getStatus());
  }
}

} }

// 开始网络服务发现 NsdManager nsdManager = (NsdManager)context.getSystemService(Context.NSD_SERVICE); nsdManager.discoverServices("my.aware.service.type", NsdManager.PROTOCOL_DNS_SD, new MyDiscoveryListener());