Intent action for network events in android sdk

Question

I need to receive broadcasts for network actions like network connected, disconnected etc. I am using a broadcast receiver for this purpose. Can anyone please tell me which intent action I need to capture for network events, right now as per my search on internet I am using android.net.ConnectivityManager.CONNECTIVITY_ACTION.

Here is my broadcast receiver class:

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class NetworkStateReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub


    if (intent.getAction().equals(
            android.net.ConnectivityManager.CONNECTIVITY_ACTION)) {

        // do something..
    }
}
}

and I have also added permission for accessing network state:

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

here is how I have declared this class in manifest file

<receiver class=".NetworkStateReceiver" android:name=".NetworkStateReceiver">
    <intent-filter>
            <action android:name="android.net.ConnectivityManager.CONNECTIVITY_ACTION" />
    </intent-filter>
</receiver>

Please suggest me the right intent action if I am wrong OR if there is any other way to catch network events.

Murtha

Answer 1

Here's a working example:

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

<receiver android:name=".receiver.ConnectivityReceiver">
    <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
    </intent-filter>
</receiver>

.

public class ConnectivityReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d(ConnectivityReceiver.class.getSimpleName(), "action: "
                + intent.getAction());
    }

}

Clump

According to my test I don't need any permission to receive broadcasts whether wlan is now up/down or 3g is now up/down. I am a little bit confused, what is android.net.conn.CONNECTIVITY_CHANGE then good for? – Melissamelisse

If you look again, you'll see that the CONNECTIVITY_CHANGE isn't a permission, it's registering an intent receiver (which you can alternatively do in code). – Redouble

The answer looks the same as the the question. So why did it NOT work before the answer? – Odine

This answer just fix the intent action name in the manifest. the value of android.net.ConnectivityManager.CONNECTIVITY_ACTION is android.net.conn.CONNECTIVITY_CHANGE and it's this one which match the intent action. – Shakti

This code works, but it only tells you "connectivity change" is there a way to tell if it's connected or dissconnected? – Bergamot

Answer 2

yanchenko's answer is very much useful, i am just simplifying a little bit to get connection status, please modify onReceive as below :

public class ConnectivityReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d(ConnectivityReceiver.class.getSimpleName(), "action: "
                + intent.getAction());
        MyConstants.IS_NETWORK_AVAILABLE = haveNetworkConnection(context);
        //IS_NETWORK_AVAILABLE this variable in your activities to check networkavailability.

    } 


    private boolean haveNetworkConnection(Context context) {
        boolean haveConnectedWifi = false;
        boolean haveConnectedMobile = false;

        ConnectivityManager cm = (ConnectivityManager)   context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo[] netInfo = cm.getAllNetworkInfo();
        for (NetworkInfo ni : netInfo) {
            if (ni.getTypeName().equalsIgnoreCase("WIFI"))
                if (ni.isConnected())
                    haveConnectedWifi = true;
            if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
                if (ni.isConnected())
                    haveConnectedMobile = true;
        }
        return haveConnectedWifi || haveConnectedMobile;    
    }
}

Transaction

at Ravi K Sharma, are you aware of android.net.ConnectivityManager.EXTRA_NO_CONNECTIVITY? That's an extra boolean in the Intent extras since API level 1 which tells whether there is connectivity or not. – Repp

Regarding yesterday's comment, I noticed it was not precise. It appears that EXTRA_NO_CONNECTIVITY, at least under some circumstances, is only added to the Intent extras IF there is no connectivity. So accessing it with getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false) is supposed to yield a boolean which is true if there is no connectivity at all, and false if there is any connectivity. Besides, the code in this answer is an anti pattern because the analysis is limited. It will not detect Bluetooth tethering, USB tethering or LAN connectivity. Don't do that. – Repp

Attribution for this code, seeing as Ravi forgot it: https://mcmap.net/q/11338/-detect-whether-there-is-an-internet-connection-available-on-android-duplicate – Bradski

Why not just get the getActiveNetworkInfo() and check if it's connected and done with it? – Aphasia

Yes Ε Г И І И О, you are right in case you need not to know about type of connection you are connected to. – Transaction