check android connection function

public void checkConnection() {
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

    if (networkInfo != null && networkInfo.isConnected()) {
        Toast.makeText(MainActivity.this, "Network is available ", Toast.LENGTH_LONG).show();
    } else {
        Toast.makeText(MainActivity.this, "Network is not available ", Toast.LENGTH_LONG).show();
    }
}