Android关于WiFi以及WiFi热点操作

最近做WiFi方面需求，遇到一个问题就是连接扫描的的热点总是连接不上（不经加密的），代码如下：

    /*连接到热点*/
    public void connectToHotpot(){
        List<ScanResult> results = mWifiManager.getScanResults();
        for (ScanResult result : results){
            if (result.SSID.contains("zeus")){
                WifiConfiguration wifiConfig = new WifiConfiguration();
                wifiConfig.SSID = result.SSID;
                int wcgID = mWifiManager.addNetwork(wifiConfig);
                mWifiManager.enableNetwork(wcgID, true);
                break;
            }
        }

    }

先获取一下附近WiFi列表，如果是需要连接的WiFi，就去连接，但是执行了mWifiManager.enableNetwork(wcgID, true);这句话以后并没有连接上，（手动连接一次以后就可以自动连接了），后来在帖子上看到了答案，正确代码如下：

    /*连接到热点*/
    public void connectToHotpot(){
        List<ScanResult> results = mWifiManager.getScanResults();
        for (ScanResult result : results){
            if (result.SSID.contains("zeus")){
                WifiConfiguration wifiConfig = new WifiConfiguration();
                wifiConfig.SSID = result.SSID;
                wifiConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
                wifiConfig.wepTxKeyIndex = 0;
                int wcgID = mWifiManager.addNetwork(wifiConfig);
                mWifiManager.enableNetwork(wcgID, true);
                break;
            }
        }

    }

因为当时创建热点是不加密的，也就是开放的，这里enableNetwork的时候也需要去明确一下加密方式为none，源码中WiFi的加密方式有以下几种：

 /** WPA is not used; plaintext or static WEP could be used. */
        public static final int NONE = 0;
        /** WPA pre-shared key (requires {@code preSharedKey} to be specified). */
        public static final int WPA_PSK = 1;
        /** WPA using EAP authentication. Generally used with an external authentication server. */
        public static final int WPA_EAP = 2;
        /** IEEE 802.1X using EAP authentication and (optionally) dynamically
         * generated WEP keys. */
        public static final int IEEE8021X = 3;

        /** WPA2 pre-shared key for use with soft access point
          * (requires {@code preSharedKey} to be specified).
          * @hide
          */
        public static final int WPA2_PSK = 4;

下面是创建热点的代码：

 /** set WiFi hot spot is enableed */
    private boolean setWifiApEnabled(WifiConfiguration configuration, boolean enabled)
    {
        try
        {
            if (enabled)
            {
                mWifiManager.setWifiEnabled(false);
            }

            Method method = mWifiManager.getClass().getMethod("setWifiApEnabled",
                WifiConfiguration.class, boolean.class);
            return (Boolean) method.invoke(mWifiManager, configuration, enabled);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

        return false;
    }

开启热点是需要反射的，因为setWifiApEnable方法在源码中是@hide的，目前并不对外开放：

    /**
     * Start AccessPoint mode with the specified
     * configuration. If the radio is already running in
     * AP mode, update the new configuration
     * Note that starting in access point mode disables station
     * mode operation
     * @param wifiConfig SSID, security and channel details as
     *        part of WifiConfiguration
     * @return {@code true} if the operation succeeds, {@code false} otherwise
     *
     * @hide Dont open up yet
     */
    public boolean setWifiApEnabled(WifiConfiguration wifiConfig, boolean enabled) {
        try {
            mService.setWifiApEnabled(wifiConfig, enabled);
            return true;
        } catch (RemoteException e) {
            return false;
        }
    }

但是，好像是有个例外，htc的手机开启热点需要特殊处理一下：

 /** enable and disable htc WiFi hotspot, 2013-12-31 add special for htc */
    private boolean enableHtcHotspot(WifiConfiguration apConfig, boolean enable)
    {

        Method method = null;
        try
        {
            method = mWifiManager.getClass().getMethod("setWifiApEnabled",
                WifiConfiguration.class, Boolean.TYPE);
        }
        catch (NoSuchMethodException e)
        {
            e.printStackTrace();
        }
        // 返回热点打开状态
        boolean flag = false;
        try
        {
            flag = (Boolean) method.invoke(mWifiManager, apConfig, enable);
        }
        catch (IllegalArgumentException e)
        {
            flag = false;
            e.printStackTrace();
        }
        catch (IllegalAccessException e)
        {
            flag = false;
            e.printStackTrace();
        }
        catch (InvocationTargetException e)
        {
            flag = false;
            e.printStackTrace();
        }

        return flag;
    }

因为也是初次接触WiFi方面，所以遇到的问题比较多，需要注意的点：

1、加密方式，连接的时候一定要明确创建热点时使用的加密方式。

2、注意热点和WiFi是不能同时开的。

以上是自己遇到的坑，记录一下，关于WiFi这块周末研究一下。