智能家具实现Wifi连接和TCP简单通信，解决Wifi版本适配，连接没有网络的WIfi自动断开的问题

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目录

第一步：连接指定WIFI

第二步：注册广播监听Wifi变更和连接状态

第三步：使用Socket发送消息

第一步：连接指定WIFI

连接硬件设备暴露出来的Wifi，Wifi名称都应该有规定的格式。

连接指定Wifi前，自己需要组装好 WifiConfiguration

//WIFI密码类型
const val WIFICIPHER_WPA = 0
const val WIFICIPHER_WEP = 1
const val WIFICIPHER_NOPASS = 2

/**
 * 创建新的WIFI连接对象 WifiConfiguration
 * type Wifi的密码类型 
*/
fun createWifiInfo(SSID: String, password: String,
                           type: Int) : WifiConfiguration{
    val config = WifiConfiguration()
    config.allowedAuthAlgorithms.clear()
    config.allowedGroupCiphers.clear()
    config.allowedKeyManagement.clear()
    config.allowedPairwiseCiphers.clear()
    config.allowedProtocols.clear()
    config.SSID = "\"" + SSID + "\""
    when (type) {
        Constant.WIFICIPHER_NOPASS -> {
            config.wepKeys[0] = "\"" + "\""
            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE)
            config.wepTxKeyIndex = 0
        }
        Constant.WIFICIPHER_WEP -> {
            config.preSharedKey = "\"" + password + "\""
            config.hiddenSSID = true
            config.allowedAuthAlgorithms
                    .set(WifiConfiguration.AuthAlgorithm.SHARED)
            config.allowedGroupCiphers
                    .set(WifiConfiguration.GroupCipher.CCMP)
            config.allowedGroupCiphers
                    .set(WifiConfiguration.GroupCipher.TKIP)
            config.allowedGroupCiphers
                    .set(WifiConfiguration.GroupCipher.WEP40)
            config.allowedGroupCiphers
                    .set(WifiConfiguration.GroupCipher.WEP104)
            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE)
            config.wepTxKeyIndex = 0
        }
        Constant.WIFICIPHER_WPA -> {
            config.preSharedKey = "\"" + password + "\""
            config.hiddenSSID = true
            config.allowedAuthAlgorithms
                    .set(WifiConfiguration.AuthAlgorithm.OPEN)
            config.allowedGroupCiphers
                    .set(WifiConfiguration.GroupCipher.TKIP)
            config.allowedKeyManagement
                    .set(WifiConfiguration.KeyMgmt.WPA_PSK)
            config.allowedPairwiseCiphers
                    .set(WifiConfiguration.PairwiseCipher.TKIP)
            // config.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
            config.allowedGroupCiphers
                    .set(WifiConfiguration.GroupCipher.CCMP)
            config.allowedPairwiseCiphers
                    .set(WifiConfiguration.PairwiseCipher.CCMP)
            config.status = WifiConfiguration.Status.ENABLED
        }
    }
    return config
}

使用config连接Wifi

/**
 * 连接指定Wifi
 */
private fun connectWifi(name: String, config: WifiConfiguration) {
//判断当前系统是否已经缓存有和 name相同的wifi
    var isCon = false
//遍历当前系统所有保存的Wifi
    val wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
    for (c in wifiManager.configuredNetworks) {
//注意这里名字里面还有""
        if (c.SSID.toString() == "\"$name\"") {
            isCon = true
//如果有保存过的wifi，直接调用连接
            WiFiUtil().connectWifiByReflectMethod(cworkId, wifiManager, config)
        }
    }
    if (!isCon) {
//如果没有需要自己构建config连接wifi
        connect(config)
    }
}
/**
 * 连接自己创建的Wifi
 */
private fun connect(config: WifiConfiguration) {
    //获取构建好的WifiConfig的ID
    val wcgID = wifiManager.addNetwork(config)
    //重点。使用反射调用各版本系

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