Oreo Wifi Connectivity

I had same issue. This is how I fix this issue in Android 8+ devices. 1. Since Android 8+ devices auto switch between WiFI and Cellular devices. I removed below code. i.e. Code to force move to wifi.

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {    NetworkRequest.Builder request = new NetworkRequest.Builder();    Log.i("forceCellularConnection","request WIFI enable");    request.addCapability(NetworkCapabilities.TRANSPORT_WIFI);    connectivityManager.requestNetwork(request.build(), new ConnectivityManager.NetworkCallback() {          @Override          public void onAvailable(Network network) {               if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {                      connectivityManager.setProcessDefaultNetwork(network);                      connectivityManager.bindProcessToNetwork(network);                }           }     });}

2. Also added below code to forget wifi connection before we make new connection. It takes some time for device to disconnect WiFI. So I added delay before connecting to new WIFI SSID.

   this.wifiManager.disableNetwork(configuration.networkId);this.wifiManager.removeNetwork(configuration.networkId);this.wifiManager.saveConfiguration(); // Not needed in API level 26 and above

Workaround which I tried and helped me making connection work are below: In my case also I have to connect WiFi which doesn't have internet on it. Its a peer to peer connection.

1. I Made 2-3 attempts for connection

   new CountDownTimer(16000, 2000) {

2. Also I have written below broadcast receiver to check the state of WiFI. And then made the connection.

   private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {    @Override    public void onReceive(Context context, Intent intent) {        final String action = intent.getAction();        Log.d("WifiReceiver", ">>>>SUPPLICANT_STATE_CHANGED_ACTION<<<<<<");        SupplicantState supl_state = ((SupplicantState) intent                .getParcelableExtra(WifiManager.EXTRA_NEW_STATE));        switch (supl_state) {        case ASSOCIATED:            Log.i("SupplicantState", "ASSOCIATED");            // authMsg = "ASSOCIATED";            break;        case ASSOCIATING:            // authMsg = "ASSOCIATING";            Log.i("SupplicantState", "ASSOCIATING");            break;        case AUTHENTICATING:            // authMsg = "AUTHENTICATING";            Log.i("SupplicantState", "Authenticating...");            break;        case COMPLETED:            authMsg = "CONNECTED";            Log.i("SupplicantState", "Connected");             final ConnectivityManager connection_manager =             (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);            NetworkRequest.Builder request = new NetworkRequest.Builder();            request.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);            connection_manager.registerNetworkCallback(request.build(), new ConnectivityManager.NetworkCallback() {                @Override                public void onAvailable(Network network) {                    ConnectivityManager.setProcessDefaultNetwork(network);                }            });            break;        case DISCONNECTED:

I had the same issue. What I did is adding a step to the boarding process where I invite the user to go to there settings, add manually this network with no data and accept the popup shown by the system.

I have not found a real solution yet.However, I've seen an app called eWeLink where they manage to do it, but it is not an open source project.

I am currently facing the same issue right now for the newer phone with Android 8.+. I am using WifiManager call bindProcessToNetwork here this will allows data traffic go through the wifi with no internet access,

here how I connect my phone to the access point

//Method to connect to WIFI Networkpublic boolean connectTo(String networkSSID, String key) {    WifiConfiguration config = new WifiConfiguration();    WifiInfo info = wifi.getConnectionInfo(); //get WifiInfo    int id = info.getNetworkId(); //get id of currently connected network    config.SSID = "\"" + networkSSID + "\"";    if (key.isEmpty()) {        config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);    }    int netID = wifi.addNetwork(config);    int tempConfigId = getExistingNetworkId(config.SSID);    if (tempConfigId != -1) {        netID = tempConfigId;    }    boolean disconnect = wifi.disconnect();    wifi.disableNetwork(id); //disable current network    boolean enabled = wifi.enableNetwork(netID, true);    boolean connected = wifi.reconnect();if (((Build.VERSION.SDK_INT >= Build.VERSION_CODES.M))                    || ((Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)                            && !(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M))) {                final ConnectivityManager manager = (ConnectivityManager) context                        .getSystemService(Context.CONNECTIVITY_SERVICE);                NetworkRequest.Builder builder;                builder = new NetworkRequest.Builder();                //set the transport type do WIFI                builder.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);                manager.requestNetwork(builder.build(), new ConnectivityManager.NetworkCallback() {                    @Override                    public void onAvailable(Network network) {                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {                            manager.bindProcessToNetwork(network);                        } else {                            ConnectivityManager.setProcessDefaultNetwork(network);                        }                        try {                        } catch (Exception e) {                            e.printStackTrace();                        }                        manager.unregisterNetworkCallback(this);                    }                });            }

after connecting to the access point created by the device, it will constantly drop off from it.