APP连接无、有密码wifi以及获取加密类型

概述：上层开发者想要通过代码来连接wifi，那么离不开wifimanager和WifiConfiguration.
思想就是通过构造WifiConfiguration的各项参数，封装成对象之后调用wifimanager的enableNetwork接口去连接wifi网络。
到达wifimanager之后就是走系统层wifi 的连接处理流程。
在连接的流程中就包含密码的存储等操作，关于wifi密码的存储是在data\misc\wifi\wpa_supplicant.conf中的。
整个wpa_supplicant就是wifi的驱动层，这块就比较复杂了。不是这里要说的重点。
言归正传，app连接的具体代码如下：
连接带密码的

 public boolean connectWifiPassword(WifiManager mWifiManager, String SSID, String Password) {
        Log.e("NetworkFragment", "setWifiParamsPassword");
        removeWifi(mWifiManager, SSID);
        WifiConfiguration configuration = new WifiConfiguration();
        configuration.SSID = "\"" + SSID + "\"";
        configuration.preSharedKey = "\"" + Password + "\"";
        configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
        configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
        configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
        configuration.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
        configuration.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
        configuration.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
        configuration.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
        configuration.status = WifiConfiguration.Status.ENABLED;
        return mWifiManager.enableNetwork(mWifiManager.addNetwork(configuration), true);
    }

不带密码的

    public boolean connectWifiNoPassword(WifiManager mWifiManager, String ssid) {
        removeWifi(mWifiManager, ssid);
        WifiConfiguration configuration = new WifiConfiguration();
        configuration.SSID = "\"" + ssid + "\"";
        configuration.status = WifiConfiguration.Status.ENABLED;
        configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
        configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        configuration.allowedPairwiseCiphers
                .set(WifiConfiguration.PairwiseCipher.TKIP);
        configuration.allowedPairwiseCiphers
                .set(WifiConfiguration.PairwiseCipher.CCMP);
        configuration.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
        return mWifiManager.enableNetwork(mWifiManager.addNetwork(configuration), true);
    }

获取wifi的加密类型

 public String getEncryptionType(ScanResult scanResult) {
        if (!TextUtils.isEmpty(scanResult.SSID)) {
            String capabilities = scanResult.capabilities;
            Log.i(TAG, "[" + scanResult.SSID + "]" + capabilities);
            if (!TextUtils.isEmpty(capabilities)) {
                if (capabilities.contains("WPA") || capabilities.contains("wpa")) {
                    return "wpa";
                } else if (capabilities.contains("WEP")
                        || capabilities.contains("wep")) {
                    return "wep";
                } else {
                    return "";
                }
            }
        }
        return scanResult.capabilities.toString();
    }

另外，如果想要修改wifi重连的次数的话，需要修改系统代码。
frameworks\opt\net\wifi\service\java\com\android\server\wifi\SupplicantStateTracker.java

   /* Maximum retries on a authentication failure notification */
    private static final int MAX_RETRIES_ON_AUTHENTICATION_FAILURE = 2;
    /* Maximum retries on assoc rejection events */
    private static final int MAX_RETRIES_ON_ASSOCIATION_REJECT = 16;

以上便可在自己的app中通过自己定义密码完美的实现wifi的连接。
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