Use this class to check connection availability

NetworkUtils

public class NetworkUtils {

    private static boolean isConnected;

    public NetworkUtils(Context context) {

        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivityManager == null) return;

        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        if (networkInfo == null) return;

        isConnected = networkInfo.isConnected();
    }

    public boolean isConnected() {
        return isConnected;
    }
}