Android: Check networking

.java

ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

if (networkInfo != null && networkInfo.isConnected()) {
    Log.d("MIAPP", "Estás online");

    Log.d("MIAPP", " Estado actual: " + networkInfo.getState());

    if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
        // Estas conectado a un Wi-Fi

        Log.d("MIAPP", " Nombre red Wi-Fi: " + networkInfo.getExtraInfo());
    }

} else {
    Log.d("MIAPP", "Estás offline");
}