Android Q，WifiNetworkSpecifier 在建立连接后立即失去 Wifi

Question

  @RequiresApi(api = Build.VERSION_CODES.Q)
public void openSystemDialogToConnectToWifi(String ssid, ConnectivityManager.NetworkCallback callback) {
    WifiNetworkSpecifier.Builder builder = new WifiNetworkSpecifier.Builder();
    builder.setSsid(ssid);
    builder.setWpa2Passphrase("secret");


    WifiNetworkSpecifier wifiNetworkSpecifier = builder.build();

    NetworkRequest.Builder networkRequestBuilder = new NetworkRequest.Builder();
    networkRequestBuilder.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
    networkRequestBuilder.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED);
    networkRequestBuilder.addCapability(NetworkCapabilities.NET_CAPABILITY_TRUSTED);
    networkRequestBuilder.setNetworkSpecifier(wifiNetworkSpecifier);

    NetworkRequest networkRequest = networkRequestBuilder.build();
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    cm.requestNetwork(networkRequest, callback);
}

这是我用来从我的应用程序连接到新 Wifi 的代码。我得到了一个 IP 地址，wifi 符号在状态栏中非常短暂地可见。下一刻，Wifi-Symbol 消失，系统对话框再次可见，连接到 wifi。

当我调试回调时，它会按照以下顺序执行方法：

1. 可用
2. onCapabilitiesChanged
3. onBlockedStatusChanged（阻止：false）
4. onCapabilitiesChanged
5. 失联

所有方法什么都不做（只需调用 super.method()）

硬件：一加 6 与 Android Q

Answer 1

我之前遇到过同样的问题，后来修改了“ NetworkRequest ”如下

WifiNetworkSpecifier specifier = new WifiNetworkSpecifier.Builder()
    .setSsid(ssid)
    .setWpa2Passphrase(password)
    .build();
NetworkRequest networkRequest = new NetworkRequest.Builder()
        .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
        .removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
        .addCapability(NetworkCapabilities.NET_CAPABILITY_TRUSTED)
        .addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED)
        .removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED)
        .removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN)
        .removeCapability(NetworkCapabilities.NET_CAPABILITY_FOREGROUND)
        .removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_CONGESTED)
        .removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_SUSPENDED)
        .removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_ROAMING)
        .setNetworkSpecifier(specifier)
        .build();

我刚刚删除了“ onCapabilityChanged() ”回调中给出的一些不需要的/默认的网络功能。现在 wifi 没有波动，也没有发生故障转移。