Android Marshmallow-如果无法访问互联网，如何避免Wi-Fi掉线

Question

我正在编写一个无需连接互联网即可连接到热点的应用程序。似乎在某些具有Android Marshmallow的Nexus设备上，当您连接到没有互联网请求的网络时，系统会“断开” wifi连接，并且所有请求都不会发送到热点连接。

几秒钟后，会弹出一条通知，询问您是否要保持连接状态。当答案为“是”时，请求将成功发送到热点，并且您可以获得响应。

我遇到了以下线程：https : //android.stackexchange.com/questions/131132/force-marshmallow-to-keep-a-wi-fi-without-internet-access

但是，我正在寻找一种编程方式（针对没有根目录的设备）来解决此问题。我目前正在使用以下代码连接到Wifi网络：

public void connectTo(String capabilities, String password, String ssid) {
    WifiManager mWifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

    WifiConfiguration conf = new WifiConfiguration();
    conf.SSID = "\"" + ssid + "\"";
    if (capabilities.contains("WPA2")) {
        conf.preSharedKey = "\"" + password + "\"";
    } else if (capabilities.contains("WPA")) {
        conf.preSharedKey = "\"" + password + "\"";
    } else if (capabilities.contains("WEP")) {
        conf.wepKeys[0] = "\"" + password + "\"";
        conf.wepTxKeyIndex = 0;
        conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        conf.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
    } else {
        conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
    }

    mWifiManager.addNetwork(conf);

    List<WifiConfiguration> list = mWifiManager.getConfiguredNetworks();

    if (list == null) {
        return;
    }

    for (WifiConfiguration i : list) {
        if (i.SSID != null && i.SSID.equals("\"" + ssid + "\"")) {
            mWifiManager.disconnect();
            mWifiManager.enableNetwork(i.networkId, true);
            mWifiManager.reconnect();
            break;
        }
    }
}