本文牵涉 kotlin 和 rxjava 的相关知识 

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//查询wifi信息需要申请权限，权限工具类就不要在意了，重点在下面
PermissionUtils.permission(PermissionConstants.LOCATION).callback(object : PermissionUtils.SimpleCallback {
     override fun onGranted() {
     //通过授权后，开启一个等待框
         progressDialog.show()
     //    每2秒发送一次事件
         connectObs = Observable.interval(2, TimeUnit.SECONDS)
     //    取30次，还没连上就结束，算这次超时
                 .take(30)
                 .subscribeOn(Schedulers.computation())
                 .subscribe({
                     //开启扫描
                     WifiUtils.startScan()
                     //连接
                     WifiUtils.connect(padHotspotSsid, padHotspotPwd)
                 }, {}, {
                     if (progressDialog.isShowing) progressDialog.dismiss()
                     ToastUtils.showShort("连接屏热点超时")
                 })
     }

     override fun onDenied() {
         ToastUtils.showShort("您拒绝了请求位置权限，我们无法搜寻网络连接上屏，请在设置中打开")
     }
 }).request()

WifiUtils 

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object WifiUtils {
    val wifiManager: WifiManager = Utils.getApp().applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
    val connectivityManager: ConnectivityManager = Utils.getApp().applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    fun startScan() {
        if (!wifiManager.isWifiEnabled) wifiManager.isWifiEnabled = true;
        wifiManager.startScan()
    }

    fun getScanResult() = wifiManager.scanResults

    fun connect(ssid: String, pwd: String): Boolean {
//      之前的写法是之前有连接的话先断连，后来发现小米华为这种一旦断连会特别积极的重连，导致指定的wifi抢不到
//      试过之后发现可以不用断，就注释掉了，直接走下面的代码进行连接
//        如果已经连上wifi了
//        if(NetworkUtils.isWifiConnected()) {
////            直接忘掉
//            if(!wifiManager.removeNetwork(wifiManager.connectionInfo.networkId)) {
////                忘不掉，至少尝试断连
//                wifiManager.disconnect()
////                断连在某些手机依然可能会失败，或者返回true其实没断掉，或者断掉了立马又被重连。。等等
//            }
//        }

        //在扫描到的wifi中找ssid也就是wifi名相同的，如果没有说明没搜到，那么连不了，等下一次吧
        val scanResult = wifiManager.scanResults.singleOrNull { it.SSID == ssid }
        if (scanResult == null) {
            return false
        } else {
        //如果找到了wifi了，从配置表中搜索该wifi的配置config，也就是以前有没有连接过
            var success = false
            //注意configuredNetworks中的ssid，系统源码中加上了双引号，这里比对的时候要去掉
            val config = wifiManager.configuredNetworks.singleOrNull { it.SSID.replace("\"", "") == ssid }
            if (config != null) {
                //如果找到了，那么直接连接，不要调用wifiManager.addNetwork  这个方法会更改config的！
//                val netId = wifiManager.addNetwork(config)
                success = wifiManager. enableNetwork(config.networkId,true)
            } else {
                // 没找到的话，就创建一个新的配置，然后正常的addNetWork、enableNetwork即可
                val padWifiNetwork = createWifiConfig(scanResult.SSID, pwd, getCipherType(scanResult.capabilities))
                val netId = wifiManager.addNetwork(padWifiNetwork)
                success = wifiManager. enableNetwork(netId,true)
            }
            LogUtils.d("连接${scanResult.SSID}...$success")
            return success
        }
    }
    
    fun isConnected(ssid: String): Boolean {
        return if (wifiManager.isWifiEnabled) {
            wifiManager.connectionInfo.ssid.replace("\"", "") == ssid
        } else {
            false
        }
    }

    private fun createWifiConfig(ssid: String, password: String, type: WifiCapability): WifiConfiguration {
        //初始化WifiConfiguration
        val config = WifiConfiguration()
        config.allowedAuthAlgorithms.clear()
        config.allowedGroupCiphers.clear()
        config.allowedKeyManagement.clear()
        config.allowedPairwiseCiphers.clear()
        config.allowedProtocols.clear()

        //指定对应的SSID
        config.SSID = "\"" + ssid + "\""

        //如果之前有类似的配置
        val tempConfig = wifiManager.configuredNetworks.singleOrNull { it.SSID == "\"$ssid\"" }
        if (tempConfig != null) {
            //则清除旧有配置  不是自己创建的network 这里其实是删不掉的
            wifiManager.removeNetwork(tempConfig.networkId)
            wifiManager.saveConfiguration()
        }

        //不需要密码的场景
        if (type == WifiCapability.WIFI_CIPHER_NO_PASS) {
            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE)
            //以WEP加密的场景
        } else if (type == WifiCapability.WIFI_CIPHER_WEP) {
            config.hiddenSSID = true
            config.wepKeys[0] = "\"" + password + "\""
            config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN)
            config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED)
            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE)
            config.wepTxKeyIndex = 0
            //以WPA加密的场景，自己测试时，发现热点以WPA2建立时，同样可以用这种配置连接
        } else if (type == WifiCapability.WIFI_CIPHER_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.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP)
            config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP)
            config.status = WifiConfiguration.Status.ENABLED
        }

        return config
    }

    fun getCipherType(capabilities: String): WifiCapability {
        return if (capabilities.contains("WEB")) {
            WifiCapability.WIFI_CIPHER_WEP
        } else if (capabilities.contains("PSK")) {
            WifiCapability.WIFI_CIPHER_WPA
        } else if (capabilities.contains("WPS")) {
            WifiCapability.WIFI_CIPHER_NO_PASS
        } else {
            WifiCapability.WIFI_CIPHER_NO_PASS
        }
    }

    fun getDhcpInfo(): String {
        val dhcpInfo = wifiManager.dhcpInfo
        return intIP2StringIP(dhcpInfo.serverAddress)

    }

    fun intIP2StringIP(ip: Int): String {
        return (ip and 0xFF).toString() + "." +
                (ip shr 8 and 0xFF) + "." +
                (ip shr 16 and 0xFF) + "." +
                (ip shr 24 and 0xFF)
    }
}

enum class WifiCapability {
    WIFI_CIPHER_WEP, WIFI_CIPHER_WPA, WIFI_CIPHER_NO_PASS
}
}