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copied!<p>You can register a <a href="http://developer.android.com/reference/android/content/BroadcastReceiver.html"><code>BroadcastReceiver</code></a> to be notified when a WiFi connection is established (or if the connection changed).</p> <p>Register the <code>BroadcastReceiver</code>:</p> <pre><code>IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION); registerReceiver(broadcastReceiver, intentFilter); </code></pre> <p>And then in your <code>BroadcastReceiver</code> do something like this:</p> <pre><code>@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 } } } </code></pre> <p>For more info, see the documentation for <a href="http://developer.android.com/reference/android/content/BroadcastReceiver.html"><code>BroadcastReceiver</code></a> and <a href="http://developer.android.com/reference/android/net/wifi/WifiManager.html"><code>WifiManager</code></a></p> <p>Of course you should check whether the device is already connected to WiFi before this.</p> <p>EDIT: Thanks to ban-geoengineering, here's a method to check whether the device is already connected:</p> <pre><code> private boolean isConnectedViaWifi() { ConnectivityManager connectivityManager = (ConnectivityManager) appObj.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mWifi = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI); return mWifi.isConnected(); } </code></pre>

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