Monitoring internet connectivity everytime app opens in android

Question

I am checking the connectivity of the device as suggested in this question with the following code:

final ConnectivityManager conMgr =  (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo();
if (activeNetwork != null && activeNetwork.getState() == NetworkInfo.State.CONNECTED) {
    //notify user you are online
} else {
    //notify user you are not online
}

I have this in my main Activity and it works fine, but what I would like to do now is to check the internet connection everytime the application fires up, sometimes the app is left in some state and then the internet is disconnected, so when it opens up again it does not go through the main activity so nothing is checked.

As suggested in this question I have followed this tutorial on monitoring internet activity with BroadcastReceiver and I am trying to display and AlertDialog when noConnectivity is true, but nothing happens.

This is my code, using the tutorial mentioned above:

public class MyActivity extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.welcome);

    registerReceivers() ;
         (..my activity code goes here...)

}   

    private void noInternet()
    {
        Intent myIntent = new Intent(this, NoInternetActivity.class);
        startActivity(myIntent);
    }

    /*
     * method to be invoked to register the receiver
     */
    private void registerReceivers() {    
        registerReceiver(mConnReceiver, 
            new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    }

    private void alert()
    {
        AlertDialog alertDialog = new AlertDialog.Builder(this).create();
        alertDialog.setTitle("internet connection");
        alertDialog.setMessage("To use this app you need intenet connection");
        alertDialog.setButton("ok", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int which) {
              // here you can add functions
           }
        });
        alertDialog.show();
    }

    private BroadcastReceiver mConnReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            boolean noConnectivity = intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
            String reason = intent.getStringExtra(ConnectivityManager.EXTRA_REASON);
                        boolean isFailover = intent.getBooleanExtra(ConnectivityManager.EXTRA_IS_FAILOVER, false);

            NetworkInfo currentNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
            NetworkInfo otherNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_OTHER_NETWORK_INFO);

            // do application-specific task(s) based on the current network state, such 
            // as enabling queuing of HTTP requests when currentNetworkInfo is connected etc.

            if(noConnectivity)
            {
                alert();
                noInternet();
            }

        }
    };
}

but neither alert() or noInternet() gets fired up.

Hope you can help me out. Thanks

score 1 · Answer 1 · answered May 13 '12 at 18:27

1

If you want to run some code every time your activity resumes, even if it is already open, then override and put your checker code inside of onResume(). This gets called every time the activity opens.

answered May 13 '12 at 18:27

Tim

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but will I have to do this in every activity I have? – marimaf May 13 '12 at 18:31
If you need to have connectivity in every activity, then I might do that. Would that be difficult or problematic? – Tim May 13 '12 at 21:16
I would say 95% of my activity classes need connectivity as they get dynamic content from a server. I don't feel adding this to every activity is the best solution, but I might end up doing that if I don't find a better one. Thanks – marimaf May 13 '12 at 22:37

score 1 · Answer 2 · answered Jun 26 '12 at 01:34

In your case you move that registerReceivers to onStart or onResume methods.

Now if you want to have it in every activity, Create a base activity [BaseActivity] that extends activity and put this method on the onStart or onResume in that base class. Now extend each of your activities from that BaseActivity.

Be careful that you do not put them into Fragment lifecycle methods, in case you are using Fragments

Monitoring internet connectivity everytime app opens in android

2 Answers2