通过getSystemService请求NSD_SERVICE时应用程序未响应

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />

if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_NETWORK_STATE) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_NETWORK_STATE}, REQUEST_CODE);
}

NsdManager nsdManager = (NsdManager) getSystemService(Context.NSD_SERVICE);

new Thread(new Runnable() {
    @Override
    public void run() {
        NsdManager nsdManager = (NsdManager) getSystemService(Context.NSD_SERVICE);
        // 执行服务发现的相关操作
    }
}).start();

try {
    NsdManager nsdManager = (NsdManager) getSystemService(Context.NSD_SERVICE);
    // 初始化NsdManager并开始服务发现
} catch (Exception e) {
    e.printStackTrace();
    // 处理异常情况
}