WIFI BroadcastReceiver Detect

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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: @Override public 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. --------------------------------------------------------------------------------------------------------------- IntentFilter filter = new IntentFilter(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);        br r = new br();        registerReceiver(r,filter); ======================================================================= @Override public 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         Toast.makeText(context, "wifi on",Toast.LENGTH_SHORT).show();         } else {             // wifi connection was lost         Toast.makeText(context, "wifi off",Toast.LENGTH_SHORT).show();         }     } }