BroadcastReceiver implementation to make your android app aware of internet connection changes.

ConnectionReceiver.java

//****************************** Class ******************************
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * BroadcastReceiver that listens for internet connection changes and notifies these changes
 * to the subscribers for ConnectionRestoredEvent and ConnectionLostEvent.
 * @see <a href="https://github.com/greenrobot/EventBus"</a> for further information about EventBus.
 */
public class ConnectionReceiver extends BroadcastReceiver {
  
    @Override
    public void onReceive(Context context, Intent intent) {
        if (isNetworkAvailable(context)) {
            EventBus.getDefault().post(new ConnectionRestoredEvent() /* Event you have to create and handle */);
        } else {
            EventBus.getDefault().post(new ConnectionLostEvent() /* Event you have to create and handle */);
        }
    }
    
    /**
     * Verifies whether the device has internet connection or not.
     *
     * @param context Context
     * @return true if connected, false otherwise.
     */
    private boolean isNetworkAvailable(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        return activeNetworkInfo != null && activeNetworkInfo.isConnected();
    }
}

//****************************** IMPORTANT! ADD THIS INTO YOUR MANIFEST (inside the <application> tag) ******************************
<receiver android:name="{your app package}.receivers.ConnectionReceiver">
      <intent-filter>
          <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
      </intent-filter>
</receiver>