How to detect when WIFI Connection has been established in Android?

You can register a BroadcastReceiver to be notified when a WiFi connection is established (or if the connection changed).

Register the BroadcastReceiver:

IntentFilter intentFilter = new IntentFilter();intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);registerReceiver(broadcastReceiver, intentFilter);

And then in your BroadcastReceiver do something like this:

@Overridepublic void onReceive(Context context, Intent intent) {    final String action = intent.getAction();    if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION)) {        if (intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, false)) {            //do stuff        } else {            // wifi connection was lost        }    }}

For more info, see the documentation for BroadcastReceiver and WifiManager

Of course you should check whether the device is already connected to WiFi before this.

EDIT:Thanks to ban-geoengineering, here's a method to check whether the device is already connected:

private boolean isConnectedViaWifi() {     ConnectivityManager connectivityManager = (ConnectivityManager) appObj.getSystemService(Context.CONNECTIVITY_SERVICE);     NetworkInfo mWifi = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);          return mWifi.isConnected();}

The best that worked for me:

AndroidManifest

<receiver android:name="com.AEDesign.communication.WifiReceiver" >   <intent-filter android:priority="100">      <action android:name="android.net.wifi.STATE_CHANGE" />   </intent-filter></receiver>

BroadcastReceiver class

public class WifiReceiver extends BroadcastReceiver {   @Override   public void onReceive(Context context, Intent intent) {      NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);      if(info != null && info.isConnected()) {        // Do your work.         // e.g. To check the Network Name or other info:        WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);        WifiInfo wifiInfo = wifiManager.getConnectionInfo();        String ssid = wifiInfo.getSSID();      }   }}

Permissions

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

For me only WifiManager.NETWORK_STATE_CHANGED_ACTION works.

Register a broadcast receiver:

IntentFilter intentFilter = new IntentFilter();intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);registerReceiver(broadcastReceiver, intentFilter);

and receive:

@Overridepublic void onReceive(Context context, Intent intent) {    final String action = intent.getAction();    if(action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)){        NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);        boolean connected = info.isConnected();        //call your method    }      }