Android WifiManager。addNetwork（）返回-1

Question

我正在写一个Android应用程序，它将连接到一个特定的WPA接入点，当连接时，它将发出一个超文本传输协议调用。它不会保存网络配置。我几乎读过关于连接到wifi网络的堆栈溢出的每一篇文章，但找不到适合我的答案。这是我用来连接的代码...

    WifiConfiguration wc = new WifiConfiguration();
    wc.allowedAuthAlgorithms.clear();
    wc.allowedGroupCiphers.clear();
    wc.allowedPairwiseCiphers.clear();
    wc.allowedProtocols.clear();
    wc.allowedKeyManagement.clear();
    wc.SSID = "\"".concat("<ssid>").concat("\"");
    wc.preSharedKey = "\"".concat("<password>").concat("\"");
    wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
    wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
    wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
    wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
    wc.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
    wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
    wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
    wc.allowedProtocols.set(WifiConfiguration.Protocol.RSN); // For WPA2
    wc.allowedProtocols.set(WifiConfiguration.Protocol.WPA); // For WPA
    wc.priority = 0;
    //wc.hiddenSSID = true;
    wc.status = WifiConfiguration.Status.ENABLED;
    // connect to and enable the connection
    WifiManager wifiManager = (WifiManager) getSystemService(this.WIFI_SERVICE);
    int netId = wifiManager.addNetwork(wc);
    boolean wifiEnabled = wifiManager.enableNetwork(netId, true);
    wifiManager.setWifiEnabled(true);
    Log.d("opener", "addNetwork returned " + netId);
    if (netId > 0) {
        wifiId = netId;
    }

然而，netId总是-1。我曾在两款不同的手机上试用过（ICS:HTC Rezound和GingerBread:Motorola DroidX）。两者显示出完全相同的结果。我做错了什么？

编辑：我用WPA2访问点尝试了相同的代码，得到了非常奇怪的结果。当这个代码运行时，第一次它将返回-1，但如果我第二次调用相同的方法并延迟1秒，它将返回有效的netId。所以问题是

1. 为什么上面的代码没有连接到wpa
2. 在wpa2中，为什么需要调用上述方法两次才能连接？编辑：我观察到我必须连接多次才能连接。有时连接需要3-4次。所以现在我一直在循环，直到addingconfig返回

Answer 1

问题是您试图添加已经存在的网络配置。当你打电话时：

int netId = wifiManager.addNetwork(wc);

如果已经存在具有相同SSID的网络配置，则会失败（返回-1）。因此，您需要做的是检查netId是否为-1，如果是，遍历配置的网络，搜索具有相同SSID的网络，一旦找到，返回networkId。

静态编程语言：

var netId = wifiManager.addNetwork(conf)
if (netId == -1) netId = wifiManager.configuredNetworks?.let {
    it.firstOrNull { it.SSID.trim('"') == ssid.trim('"') }?.networkId ?: -1
}
wifiManager.enableNetwork(netId, true)

Answer 2

我发现，如果共享密钥少于8个字符，它将返回-1。

Answer 3

可能有点晚，但请尝试连接到Open/WPA/WPA2/WEP安全网络

    WifiConfiguration wifiConfig = new WifiConfiguration();
    wifiConfig.SSID = selectedNetwork.SSID();
    wifiConfig.status = WifiConfiguration.Status.DISABLED;
    wifiConfig.priority = 40;

    // Dependent on the security type of the selected network
    // we set the security settings for the configuration
    if (/*Open network*/) {
        // No security
        wifiConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        wifiConfig.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
        wifiConfig.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
        wifiConfig.allowedAuthAlgorithms.clear();
        wifiConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
        wifiConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
    } else if (/*WPA*/ || /*WPA2*/) {
        //WPA/WPA2 Security
        wifiConfig.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
        wifiConfig.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
        wifiConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
        wifiConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
        wifiConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
        wifiConfig.preSharedKey = "\"".concat(password).concat("\"");
    } else if (/*WEP*/) {
        // WEP Security
        wifiConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        wifiConfig.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
        wifiConfig.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
        wifiConfig.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
        wifiConfig.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
        wifiConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
        wifiConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
        wifiConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);

        if (getHexKey(password)) wifiConfig.wepKeys[0] = password;
        else wifiConfig.wepKeys[0] = "\"".concat(password).concat("\"");
        wifiConfig.wepTxKeyIndex = 0;
    }

    // Finally we add the new configuration to the managed list of networks
    int networkID = wifiMan.addNetwork(wifiConfig);

显然，根据需要为不同的安全类型设置自己的变量。连接到WEP安全网络的密钥（请原谅双关语）是getHexKey方法，如下所示。

/**
 * WEP has two kinds of password, a hex value that specifies the key or
 * a character string used to generate the real hex. This checks what kind of
 * password has been supplied. The checks correspond to WEP40, WEP104 & WEP232
 * @param s
 * @return
 */
private static boolean getHexKey(String s) {
    if (s == null) {
        return false;
    }

    int len = s.length();
    if (len != 10 && len != 26 && len != 58) {
        return false;
    }

    for (int i = 0; i < len; ++i) {
        char c = s.charAt(i);
        if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F')) {
            continue;
        }
        return false;
    }
    return true;
}