Stanislav's answer is correct but incomplete because only works in Lollipop.
I've wrote a complete solution for Lollipop and Marshmallow onwards for you to route all network requests through WiFi when connected to a specific network of your choice.
Kotlin
In your Activity,
@RequiresApi(Build.VERSION_CODES.LOLLIPOP)
class RoutingActivity : Activity() {
private var mConnectivityManager: ConnectivityManager? = null
private var mNetworkCallback: ConnectivityManager.NetworkCallback? = null
//...
override fun onCreate(savedInstanceState: Bundle?) {
//...
routeNetworkRequestsThroughWifi("Access-Point-SSID-You-Want-To-Route-Your-Requests")
}
Route future network requests from application through WiFi (even if given WiFi network is without internet and mobile data has internet connection)
/**
* This method sets a network callback that is listening for network changes and once is
* connected to the desired WiFi network with the given SSID it will bind to that network.
*
* Note: requires android.permission.INTERNET and android.permission.CHANGE_NETWORK_STATE in
* the manifest.
*
* @param ssid The name of the WiFi network you want to route your requests
*/
private fun routeNetworkRequestsThroughWifi(ssid: String) {
mConnectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
// ensure prior network callback is invalidated
unregisterNetworkCallback(mNetworkCallback)
// new NetworkRequest with WiFi transport type
val request = NetworkRequest.Builder()
.addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
.build()
// network callback to listen for network changes
mNetworkCallback = object : ConnectivityManager.NetworkCallback() {
// on new network ready to use
override fun onAvailable(network: Network) {
if (getNetworkSsid(this@RoutingActivity).equals(ssid, ignoreCase = false)) {
releaseNetworkRoute()
createNetworkRoute(network)
} else {
releaseNetworkRoute()
}
}
}
mConnectivityManager?.requestNetwork(request, mNetworkCallback)
}
Unregister network callback
private fun unregisterNetworkCallback(networkCallback: ConnectivityManager.NetworkCallback?) {
if (networkCallback != null) {
try {
mConnectivityManager?.unregisterNetworkCallback(networkCallback)
} catch (ignore: Exception) {
} finally {
mNetworkCallback = null
}
}
}
Create network route
private fun createNetworkRoute(network: Network): Boolean? {
var processBoundToNetwork: Boolean? = false
when {
// 23 = Marshmallow
Build.VERSION.SDK_INT >= 23 -> {
processBoundToNetwork = mConnectivityManager?.bindProcessToNetwork(network)
}
// 21..22 = Lollipop
Build.VERSION.SDK_INT in 21..22 -> {
processBoundToNetwork = ConnectivityManager.setProcessDefaultNetwork(network)
}
}
return processBoundToNetwork
}
Release network route
private fun releaseNetworkRoute(): Boolean? {
var processBoundToNetwork: Boolean? = false
when {
// 23 = Marshmallow
Build.VERSION.SDK_INT >= 23 -> {
processBoundToNetwork = mConnectivityManager?.bindProcessToNetwork(null)
}
// 21..22 = Lollipop
Build.VERSION.SDK_INT in 21..22 -> {
processBoundToNetwork = ConnectivityManager.setProcessDefaultNetwork(null)
}
}
return processBoundToNetwork
}
Helper
private fun getNetworkSsid(context: Context?): String {
// WiFiManager must use application context (not activity context) otherwise a memory leak can occur
val mWifiManager = context?.applicationContext?.getSystemService(Context.WIFI_SERVICE) as WifiManager
val wifiInfo: WifiInfo? = mWifiManager.connectionInfo
if (wifiInfo?.supplicantState == SupplicantState.COMPLETED) {
return wifiInfo.ssid.removeSurrounding("\"")
}
return ""
}
