How to be notified on wifi network status change?

Question

I am writing an app that connects to a telnet server via wifi. I have a service that manages the socket connection. It all works fine, but when the phone sleeps it disconn

Answer 1

*set these permissions in your manifest

<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />

*Register a BroadcastReceiver for these actions filters in your manifest

 <receiver android:name="com.myBroadcastReceiver" >
            <intent-filter>
                <action android:name="android.net.wifi.supplicant.CONNECTION_CHANGE" />
                <action android:name="android.net.wifi.STATE_CHANGE" />
            </intent-filter>
        </receiver>

*Define your BroadcastReceiver´s implementation

public class myBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        WifiManager wifiManager = (WifiManager) context
                .getSystemService(Context.WIFI_SERVICE);

        NetworkInfo networkInfo = intent
                .getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
        if (networkInfo != null) {
            Log.d(AppConstants.TAG, "Type : " + networkInfo.getType()
                    + "State : " + networkInfo.getState());


if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {

   //get the different network states
if (networkInfo.getState() == NetworkInfo.State.CONNECTING || networkInfo.getState() ==        NetworkInfo.State.CONNECTED) {
    }
                        }
                      }

                    }
                }

Answer 2

Not sure as to the exact way to do this but I think the ConnectivityManager would be a good place to start.

http://developer.android.com/reference/android/net/ConnectivityManager.html

you can get an instance of this class by calling Context.getSystemService(Context.CONNECTIVITY_SERVICE)

There are also some other good classes in android.net that you can use.

Hope that helps.

Answer 3

I know this is an old question but see the following developer documentation:

http://developer.android.com/training/monitoring-device-state/connectivity-monitoring.html

Answer 4

Register a BroadcastReceiver for ConnectivityManager.CONNECTIVITY_ACTION. In the onReceive handler you can call NetworkInfo info = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO) and then info.getType() and check for ConnectivityManager.TYPE_WIFI and do what you want then. :)