对于任何可能有同样问题的人，以下是我如何解决它：
1.为了确保您的设备不会重新连接到您上一次连接的wifi网络，只需在尝试连接到新的wifi网络（可能没有互联网功能）之前禁用当前连接的网络。此外，我首先检查我想连接的网络是否已经为设备所知，这使我们不必创建新的WiFi配置。
1.有时，连接到网络可能需要一分钟以上。我真的不知道为什么，但我也找到了一个解决办法。每当我尝试使用上述解决方案连接到新网络时，我都会启动一个计时器，该计时器在一定时间段后超时（在我的情况下为5秒）。一旦连接建立成功，我就停止计时器。但如果超时后没有建立连接，我只需重试连接到所需的网络。在大多数情况下（>95%），连接在10秒内成功。
下面是我的工作代码：

private lateinit var timeoutCoroutine: Job

    private fun connectToSelectedNetwork(SSID: String) {
        // Figure out if the network is known to the device and in this case connect to it
        if (!connectToKnownNetwork(SSID)){
            // If the network is unknown, we first have to configure it before connecting
            val network = configureNetwork(SSID)
            connect(network)
        }
        startConnectionEstablishmentTimeoutCoroutine(SSID)
    }

    private fun connectToKnownNetwork(SSID: String): Boolean {
        for (c in wifiManager.configuredNetworks) {
            if (SSID == c.SSID.removeSurrounding("\"")){
                if (connect(c.networkId)){
                    return true
                }
            }
        }
        return false
    }

    private fun configureNetwork(SSID: String): Int {
        val conf = WifiConfiguration()
        conf.SSID = "\"" + SSID + "\""
        conf.preSharedKey = "\"" + PASSPHRASE + "\""
        conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK)
        return wifiManager.addNetwork(conf)
    }

    private fun connect(network: Int): Boolean {
        wifiManager.disableNetwork(wifiManager.connectionInfo.networkId)
        wifiManager.disconnect()
        val success = wifiManager.enableNetwork(network, true)
        wifiManager.reconnect()
        wifiManager.reassociate()
        return success
    }

    // For unknown reasons connecting to a network takes up to a minute when the user has not
    // interacted with the device for a while (>~15 seconds).
    // To prevent this we set a timeout after which the connection establishment shall be retried.
    private fun startConnectionEstablishmentTimeoutCoroutine(SSID: String){
        timeoutCoroutine = CoroutineScope(IO).launch {
            delay(CONNECTION_ESTABLISHMENT_TIMEOUT)
            connectToNetwork(SSID)
        }
    }