androidandroid-wifiandroid-broadcastreceiver

CONNECTIVITY_ACTION intent received twice when Wifi connected


In my app I have a BroadcastReceiver that is launched as a component through a <receiver> tag, filtering android.net.conn.CONNECTIVITY_CHANGE intents.

My goal is simply to know when a Wifi connection was established, so what I am doing in onReceive() is this:

NetworkInfo networkInfo = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
if(networkInfo.getType() == ConnectivityManager.TYPE_WIFI && networkInfo.isConnected()) {
    // Wifi is connected
}

It works fine, but I always seem to get two identical intents within about one second when a Wifi connection is established. I tried to look at any info I could get from the intent, the ConnectivityManager and WifiManager, but I can't find anything that distinguishes the two intents.

Looking at the log, there is at least one other BroadcastReceiver that also receives the two identical intents.

It is running on a HTC Desire with Android 2.2

Any idea why I seem to get a "duplicated" intent when Wifi connects or what the difference between the two might be?


Solution

  • NOTE: For a recent, up-to-date answer, see this one below!

    After a lot of googling and debugging, I believe this is the correct way to determine if Wifi has connected or disconnected.

    The onReceive() method in the BroadcastReceiver:

    public void onReceive(final Context context, final Intent intent) {
    
    if(intent.getAction().equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
        NetworkInfo networkInfo =
            intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
        if(networkInfo.isConnected()) {
            // Wifi is connected
            Log.d("Inetify", "Wifi is connected: " + String.valueOf(networkInfo));
        }
    } else if(intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
        NetworkInfo networkInfo =
            intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
        if(networkInfo.getType() == ConnectivityManager.TYPE_WIFI &&
            ! networkInfo.isConnected()) {
            // Wifi is disconnected
            Log.d("Inetify", "Wifi is disconnected: " + String.valueOf(networkInfo));
        }
    }
    }
    

    Together with the following receiver element in AndroidManifest.xml

    <receiver android:name="ConnectivityActionReceiver"
        android:enabled="true" android:label="ConnectivityActionReceiver">
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
            <action android:name="android.net.wifi.STATE_CHANGE"/>
        </intent-filter>
    </receiver>
    

    Some explanation:

    NOTE: I've received one single crash report (NPE) where the intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO) returned null. So, even if it seems to be extremely rare to happen, it might be a good idea to add a null check.

    Cheers, Torsten