Test Internet connection changes-android

Question

I've searched this and I can't resolve the problem, look at this code checked on other examples:

public class EntryActivity extends Activity {

public Boolean isNetAvailable(Context con)  {

    try{
        ConnectivityManager connectivityManager = (ConnectivityManager)       
                                                                  con.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo wifiInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        NetworkInfo mobileInfo =connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        if (wifiInfo.isConnected() || mobileInfo.isConnected()) {
            return true;
        }
    }
    catch(Exception e){
       e.printStackTrace();
    }
    return false;

this method works well when I call it in onCreate method, like this:

if (isNetAvailable(getApplicationContext())) {
        Toast.makeText(EntryActivity.this,
            "You have Internet Connection, wait a moment to sincronize" +
            "Metar's stations", Toast.LENGTH_LONG)
               .show();
         Intent myIntent = new Intent(this, MainActivity.class);
         startActivity(myIntent);

    } else {
        Toast.makeText(EntryActivity.this,
            "You Do not have Internet Connection",
                Toast.LENGTH_LONG).show();

        EntryActivity.this.startActivity(new Intent(
                Settings.ACTION_WIRELESS_SETTINGS));
            }

This only works for the first Internet connection Check! the problem is, if Wifi is off the user should leaves the app or turns Wi-Fi on.But, if He turns it on, I don't have access to that change and I can't advance to my other activity. So, If in the beggining the internet connection status is down, i want keep checking if the User turns it On to advanve to other activity. What can I do?

Answer 1

In you android manifest:

<receiver android:name="com.softteco.clivero.receivers.ConnectionReceiver" >
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            </intent-filter>
        </receiver>

And create class:

public class ConnectionReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        boolean newConnectionState = isConnected(context);
    }
    private boolean isConnected(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo[] info = connectivityManager.getAllNetworkInfo();
        boolean ifConnected = false;
        for (int i = 0; i < info.length; i++) {
            NetworkInfo connection = info[i];
            if (connection.getState().equals(NetworkInfo.State.CONNECTED)) {
                ifConnected = true;
            }
        }
        return ifConnected;
    }

}

It's one of the possible variants. Hope it will help you.