Force Android to Use Wifi network with no internet

Question

I am building an android app that needs to communicate over a WiFi network that will not have any internet access. The problem is that even when the WiFi is connected androi

Answer 1

Solution on Kotlin

class ConnectWithoutInternetTest constructor(
private val mContext: Context,
private val connectivityManager: ConnectivityManager,
private val wifiManager: WifiManager
) {

private val mWifiBroadcastReceiver = object : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
        when (intent.action) {
            WifiManager.NETWORK_STATE_CHANGED_ACTION -> {
                val info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO)
                val isConnected = info.isConnected

                val ssid: String? = normalizeAndroidWifiSsid(wifiManager.connectionInfo?.ssid)

                if (isConnected) {
                    val builder = NetworkRequest.Builder()
                    builder.addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
                    connectivityManager.registerNetworkCallback(
                        builder.build(),
                        object : ConnectivityManager.NetworkCallback() {
                            override fun onAvailable(network: Network) {
                                super.onAvailable(network)
                                val networkInfo = connectivityManager.getNetworkInfo(network)
                                val networkSsid = networkInfo.extraInfo
                                if (networkSsid == ssid) {
                                    connectivityManager.unregisterNetworkCallback(this)
                                }
                            }
                        })
                }
            }
        }
    }
}

private fun init() {
    val intentFilter = IntentFilter()
    intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION)
    mContext.registerReceiver(mWifiBroadcastReceiver, intentFilter)
}

private fun destroy() {
    mContext.unregisterReceiver(mWifiBroadcastReceiver)
}

private fun normalizeAndroidWifiSsid(ssid: String?): String? {
    return ssid?.replace("\"", "") ?: ssid
}

fun connectToWifi(ssidParam: String, password: String?) {
    init()
    val ssid = "\"$ssidParam\""
    val config = wifiManager.configuredNetworks.find { it.SSID == ssid }
    val netId = if (config != null) {
        config.networkId
    } else {
        val wifiConfig = WifiConfiguration()
        wifiConfig.SSID = ssid
        password?.let { wifiConfig.preSharedKey = "\"$password\"" }
        wifiConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE)
        wifiManager.addNetwork(wifiConfig)
    }

    wifiManager.disconnect()
    val successful = wifiManager.enableNetwork(netId, true)
}