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androidwifi
Catalin Morosan
Catalin Morosan

Reputation: 7937

Android 6.0 check if connected to a Wi-Fi (without Internet)

Here is how I check if the Android device is connected to a Wi-Fi network:

NetworkInfo info = ((ConnectivityManager) ctx.getSystemService(Context
         .CONNECTIVITY_SERVICE)).getNetworkInfo(ConnectivityManager.TYPE_WIFI);
boolean isWifiConnected = info != null && info.isAvailable() && info.isConnected();

This works perfectly on all versions prior to Android 6.0. However, on Android 6.0, if the device is connected to a Wi-Fi without Internet access, info.isConnected() returns false.

So, how can I know for sure that the device is connected to a Wi-Fi on Android 6.0?

Upvotes: 4

Views: 2544

Answers (2)

Catalin Morosan
Catalin Morosan

Reputation: 7937

For Android 5.0 and above you need to use a different API to check that the device is connected to a WiFi network. The device might also be simultaneously connected to a mobile network.

ConnectivityManager connectivityManager = ((ConnectivityManager) ctx.getSystemService
                (Context.CONNECTIVITY_SERVICE));
        boolean isWifiConnected = false;
        Network[] networks = connectivityManager.getAllNetworks();
        if (networks == null) {
            isWifiConnected = false;
        } else {
            for (Network network : networks) {
                NetworkInfo info = connectivityManager.getNetworkInfo(network);
                if (info != null && info.getType() == ConnectivityManager.TYPE_WIFI) {
                    if (info.isAvailable() && info.isConnected()) {
                        isWifiConnected = true;
                        break;
                    }
                }
            }
        }
        return isWifiConnected;

Upvotes: 3

amram99
amram99

Reputation: 709

I have the same issue. You can check if there is an SSID, which implies a connection:

WifiManager wifiManager = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
if (wifiManager.getConnectionInfo() != null) {
    String ssid = wifiManager.getConnectionInfo().getSSID();
}

The system is routing traffic to the cell connection, so the OS is reporting the Wi-Fi network as disconnected. Android 6.0 changed the underlying routing logic to avoid Wi-Fi connections without internet. This is why connectivityManager.getActiveNetworkInfo() no longer returns the NetworkInfo for the Wi-Fi connection w/o internet if there is an active cellular data connection.

It seems that ConnectivityManager.bindProcessToNetwork(Network network) is how you tell the OS to prefer one network over another.

Upvotes: 2

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