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2013-09-26T10:43:13.733
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I had exactly the same problem for a project of mine and it took a while to find a solution. First of all, "connecting to a WiFi" is something very abstract, and it turns out rightly so. In practice, people usually mean all of the following: <ul> <li>authenticated with a WiFi access point</li> <li>associated with the access point</li> <li>got an ip address from the network</li> </ul> All these stages (and several more) are associated with different Andoid events. So, without further ado, here is my (slightly modified) code: <pre><code>public class MyService extends Activity { // or Service //... Other stuff BroadcastReceiver awaitIPAddress = null; private final BroadcastReceiver receiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (action.equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION)) { if (intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE) == SupplicantState.COMPLETED) { //WiFi is associated WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); WifiInfo wi = wifiManager.getConnectionInfo(); if (wi != null) { // Wifi info available (should be, we are associated) if (wi.getIpAddress() != 0) { // Lucky us, we already have an ip address. // This happens when a connection is complete, e.g. after rekeying if (wi.getBSSID().equals("c0:ff:ee:c0:ff:ee")) { // ... Do your stuff here // ... // ... } } else { // No ip address yet, we need to wait... // Battery friendly method, using events if (awaitIPAddress == null) { awaitIPAddress = new BroadcastReceiver() { @Override public void onReceive(Context ctx, Intent in) { WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); WifiInfo wi = wifiManager.getConnectionInfo(); if (wi != null) { if (wi.getIpAddress() != 0) { if (wi.getBSSID().equals("c0:ff:ee:c0:ff:ee")) { // ... Do your stuff here // ... // ... } } } else { ctx.unregisterReceiver(this); awaitIPAddress = null; } } }; // We register a new receiver for connectivity events // (getting a new IP address for example) context.registerReceiver(awaitIPAddress, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION)); } } } } else { // wifi connection not complete, release ip address receiver if registered if (awaitIPAddress != null) { context.unregisterReceiver(awaitIPAddress); awaitIPAddress = null; } } } } }; //... Other stuff @Override public void onCreate() { super.onCreate(); //... Other stuff IntentFilter filter = new IntentFilter(); filter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION); registerReceiver(receiver, filter); //... Other stuff } //... Other stuff } </code></pre> Also, don't neglect the appropriate permissions to the manifest: <pre><code><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> </code></pre> And I strongly suspect you will also need: <pre><code><uses-permission android:name="android.permission.INTERNET"/> </code></pre>
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1. POAndroid WIFI How To Detect When Specific WIFI Connection is Available
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